diff options
Diffstat (limited to 'html/baremetal')
| -rw-r--r-- | html/baremetal/101screen.subx.html | 2 | ||||
| -rw-r--r-- | html/baremetal/102keyboard.subx.html | 12 | ||||
| -rw-r--r-- | html/baremetal/103grapheme.subx.html | 6 | ||||
| -rw-r--r-- | html/baremetal/boot.hex.html | 974 | ||||
| -rw-r--r-- | html/baremetal/ex1.hex.html | 2 | ||||
| -rw-r--r-- | html/baremetal/ex2.hex.html | 4 | ||||
| -rw-r--r-- | html/baremetal/ex2.subx.html | 2 | ||||
| -rw-r--r-- | html/baremetal/ex3.hex.html | 2 | ||||
| -rw-r--r-- | html/baremetal/rpn.mu.html | 301 |
9 files changed, 681 insertions, 624 deletions
diff --git a/html/baremetal/101screen.subx.html b/html/baremetal/101screen.subx.html index b41c8b85..e00ec320 100644 --- a/html/baremetal/101screen.subx.html +++ b/html/baremetal/101screen.subx.html @@ -84,7 +84,7 @@ if ('onhashchange' in window) { <span id="L28" class="LineNr">28 </span> c1/shift 4/subop/left %eax 0xa/imm8 <span id="L29" class="LineNr">29 </span> 03/add-> *(ebp+8) 0/r32/eax <span id="L30" class="LineNr">30 </span> <span class="subxComment"># eax += location of frame buffer</span> -<span id="L31" class="LineNr">31 </span> 03/add-> *0x7f28 0/r32/eax <span class="subxComment"># unsafe</span> +<span id="L31" class="LineNr">31 </span> 03/add-> *0x8128 0/r32/eax <span class="subxComment"># unsafe</span> <span id="L32" class="LineNr">32 </span> <span class="subxComment"># *eax = color</span> <span id="L33" class="LineNr">33 </span> 8b/-> *(ebp+0x10) 1/r32/ecx <span id="L34" class="LineNr">34 </span> 88/byte<- *eax 1/r32/CL diff --git a/html/baremetal/102keyboard.subx.html b/html/baremetal/102keyboard.subx.html index e77a5b10..e0cb3e51 100644 --- a/html/baremetal/102keyboard.subx.html +++ b/html/baremetal/102keyboard.subx.html @@ -76,19 +76,19 @@ if ('onhashchange' in window) { <span id="L20" class="LineNr">20 </span> { <span id="L21" class="LineNr">21 </span> 75/jump-if-!= <span class="Constant">break</span>/disp8 <span id="L22" class="LineNr">22 </span> <span class="subxComment"># var read/ecx: byte = keyboard buffer's read index</span> -<span id="L23" class="LineNr">23 </span> 8b/-> *0x7dcc 1/r32/CL <span class="subxComment"># keyboard-buffer-read</span> +<span id="L23" class="LineNr">23 </span> 8b/-> *0x802c 1/r32/CL <span class="subxComment"># keyboard-buffer-read</span> <span id="L24" class="LineNr">24 </span> <span class="subxComment"># var next-key/eax: byte = *(keyboard buffer + ecx)</span> -<span id="L25" class="LineNr">25 </span> 8a/byte-> *(ecx+0x7dd0) 0/r32/AL <span class="subxComment"># keyboard-buffer-data</span> -<span id="L26" class="LineNr">26 </span> <span class="subxComment"># if (next-key != 0) lock and remove from keyboard-buffer</span> +<span id="L25" class="LineNr">25 </span> 8a/byte-> *(ecx+0x8030) 0/r32/AL <span class="subxComment"># keyboard-buffer-data</span> +<span id="L26" class="LineNr">26 </span> <span class="subxComment"># if (next-key != 0) lock and remove from keyboard buffer</span> <span id="L27" class="LineNr">27 </span> 81 7/subop/compare %eax 0/imm32 <span id="L28" class="LineNr">28 </span> { <span id="L29" class="LineNr">29 </span> 74/jump-if-= <span class="Constant">break</span>/disp8 <span id="L30" class="LineNr">30 </span> <span class="subxComment"># TODO: add some instructions in this block to SubX if we ever want to</span> <span id="L31" class="LineNr">31 </span> <span class="subxComment"># use bootstrap on baremetal programs</span> <span id="L32" class="LineNr">32 </span> fa/disable-interrupts -<span id="L33" class="LineNr">33 </span> c6 0/subop/copy-byte *(ecx+0x7dd0) 0/imm8 -<span id="L34" class="LineNr">34 </span> ff 0/subop/increment *0x7dcc <span class="subxComment"># keyboard-buffer-read</span> -<span id="L35" class="LineNr">35 </span> 81 4/subop/and *0x7dcc 0xf/imm32 <span class="subxComment"># keyboard-buffer-read</span> +<span id="L33" class="LineNr">33 </span> c6 0/subop/copy-byte *(ecx+0x8030) 0/imm8 <span class="subxComment"># keyboard-buffer-data</span> +<span id="L34" class="LineNr">34 </span> ff 0/subop/increment *0x802c <span class="subxComment"># keyboard-buffer-read</span> +<span id="L35" class="LineNr">35 </span> 81 4/subop/and *0x802c 0xf/imm32 <span class="subxComment"># keyboard-buffer-read</span> <span id="L36" class="LineNr">36 </span> fb/enable-interrupts <span id="L37" class="LineNr">37 </span> } <span id="L38" class="LineNr">38 </span> <span class="subxComment"># return</span> diff --git a/html/baremetal/103grapheme.subx.html b/html/baremetal/103grapheme.subx.html index a674d515..1d159d1a 100644 --- a/html/baremetal/103grapheme.subx.html +++ b/html/baremetal/103grapheme.subx.html @@ -82,9 +82,9 @@ if ('onhashchange' in window) { <span id="L25" class="LineNr"> 25 </span> <span class="subxComment"># var letter-bitmap/esi = font[g]</span> <span id="L26" class="LineNr"> 26 </span> 8b/-> *(ebp+8) 6/r32/esi <span id="L27" class="LineNr"> 27 </span> c1 4/subop/shift-left %esi 4/imm8 -<span id="L28" class="LineNr"> 28 </span> 8d/copy-address *(esi+0x8800) 6/r32/esi <span class="subxComment"># font-start</span> -<span id="L29" class="LineNr"> 29 </span> <span class="subxComment"># if (letter-bitmap >= 0x9000) return # characters beyond ASCII currently not supported</span> -<span id="L30" class="LineNr"> 30 </span> 81 7/subop/compare %esi 0x9000/imm32 +<span id="L28" class="LineNr"> 28 </span> 8d/copy-address *(esi+0x8c00) 6/r32/esi <span class="subxComment"># font-start</span> +<span id="L29" class="LineNr"> 29 </span> <span class="subxComment"># if (letter-bitmap >= 0x9400) return # characters beyond ASCII currently not supported</span> +<span id="L30" class="LineNr"> 30 </span> 81 7/subop/compare %esi 0x9400/imm32 <span id="L31" class="LineNr"> 31 </span> 7d/jump-if->= $draw-grapheme-on-real-screen:end/disp8 <span id="L32" class="LineNr"> 32 </span> <span class="subxComment"># var ycurr/edx: int = y*16</span> <span id="L33" class="LineNr"> 33 </span> 8b/-> *(ebp+0x10) 2/r32/edx diff --git a/html/baremetal/boot.hex.html b/html/baremetal/boot.hex.html index 7e72f177..1a488154 100644 --- a/html/baremetal/boot.hex.html +++ b/html/baremetal/boot.hex.html @@ -14,8 +14,8 @@ pre { white-space: pre-wrap; font-family: monospace; color: #000000; background- body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; } a { color:inherit; } * { font-size:12pt; font-size: 1em; } +.subxH1Comment { color: #005faf; text-decoration: underline; } .subxComment { color: #005faf; } -.subxS1Comment { color: #0000af; } .LineNr { } .Folded { color: #080808; background-color: #949494; } --> @@ -53,463 +53,521 @@ if ('onhashchange' in window) { <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/baremetal/boot.hex'>https://github.com/akkartik/mu/blob/main/baremetal/boot.hex</a> <pre id='vimCodeElement'> -<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Code for the first few disk sectors that all programs in this directory need:</span> -<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># - load sectors past the first (using BIOS primitives) since only the first is available by default</span> -<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># - if this fails, print 'D' at top-left of screen and halt</span> -<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># - initialize a minimal graphics mode</span> -<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># - switch to 32-bit mode (giving up access to BIOS primitives)</span> -<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># - set up a handler for keyboard events</span> -<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># - jump to start of program</span> -<span id="L8" class="LineNr"> 8 </span><span class="subxComment">#</span> -<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># To convert to a disk image, first prepare a realistically sized disk image:</span> -<span id="L10" class="LineNr"> 10 </span><span class="subxComment"># dd if=/dev/zero of=disk.img count=20160 # 512-byte sectors, so 10MB</span> -<span id="L11" class="LineNr"> 11 </span><span class="subxComment"># Create initial sectors from this file:</span> -<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># ./bootstrap run apps/hex < baremetal/boot.hex > boot.bin</span> -<span id="L13" class="LineNr"> 13 </span><span class="subxComment"># Translate other sectors into a file called a.img</span> -<span id="L14" class="LineNr"> 14 </span><span class="subxComment"># Load all sectors into the disk image:</span> -<span id="L15" class="LineNr"> 15 </span><span class="subxComment"># cat boot.bin a.img > disk.bin</span> -<span id="L16" class="LineNr"> 16 </span><span class="subxComment"># dd if=disk.bin of=disk.img conv=notrunc</span> -<span id="L17" class="LineNr"> 17 </span><span class="subxComment"># To run:</span> -<span id="L18" class="LineNr"> 18 </span><span class="subxComment"># qemu-system-i386 disk.img</span> -<span id="L19" class="LineNr"> 19 </span><span class="subxComment"># Or:</span> -<span id="L20" class="LineNr"> 20 </span><span class="subxComment"># bochs -f baremetal/boot.bochsrc # boot.bochsrc loads disk.img</span> -<span id="L21" class="LineNr"> 21 </span><span class="subxComment">#</span> -<span id="L22" class="LineNr"> 22 </span><span class="subxComment"># Since we start out in 16-bit mode, we need instructions SubX doesn't</span> -<span id="L23" class="LineNr"> 23 </span><span class="subxComment"># support.</span> -<span id="L24" class="LineNr"> 24 </span><span class="subxComment"># This file contains just lowercase hex bytes and comments. Zero</span> -<span id="L25" class="LineNr"> 25 </span><span class="subxComment"># error-checking. Make liberal use of:</span> -<span id="L26" class="LineNr"> 26 </span><span class="subxComment"># - comments documenting expected offsets</span> -<span id="L27" class="LineNr"> 27 </span><span class="subxComment"># - size checks on the emitted file (currently: 5120 bytes)</span> -<span id="L28" class="LineNr"> 28 </span><span class="subxComment"># - xxd to eyeball that offsets contain expected bytes</span> -<span id="L29" class="LineNr"> 29 </span><span class="subxComment">#</span> -<span id="L30" class="LineNr"> 30 </span><span class="subxComment"># Programs using this initialization:</span> -<span id="L31" class="LineNr"> 31 </span><span class="subxComment"># - can't use any syscalls</span> -<span id="L32" class="LineNr"> 32 </span><span class="subxComment"># - can't print text to video memory (past these boot sectors)</span> -<span id="L33" class="LineNr"> 33 </span><span class="subxComment"># - must only print raw pixels (256 colors) to video memory (resolution 1024x768)</span> -<span id="L34" class="LineNr"> 34 </span><span class="subxComment"># - must store their entry-point at address 0x9000</span> -<span id="L35" class="LineNr"> 35 </span> -<span id="L36" class="LineNr"> 36 </span><span class="subxComment">## 16-bit entry point</span> -<span id="L37" class="LineNr"> 37 </span> -<span id="L38" class="LineNr"> 38 </span><span class="subxComment"># Upon reset, the IBM PC:</span> -<span id="L39" class="LineNr"> 39 </span><span class="subxComment"># - loads the first sector (512 bytes)</span> -<span id="L40" class="LineNr"> 40 </span><span class="subxComment"># from some bootable image (see the boot sector marker at the end of this file)</span> -<span id="L41" class="LineNr"> 41 </span><span class="subxComment"># to the address range [0x7c00, 0x7e00)</span> -<span id="L42" class="LineNr"> 42 </span><span class="subxComment"># - starts executing code at address 0x7c00</span> -<span id="L43" class="LineNr"> 43 </span> -<span id="L44" class="LineNr"> 44 </span><span class="subxComment"># offset 00 (address 0x7c00):</span> -<span id="L45" class="LineNr"> 45 </span> <span class="subxComment"># disable interrupts for this initialization</span> -<span id="L46" class="LineNr"> 46 </span> fa <span class="subxComment"># cli</span> -<span id="L47" class="LineNr"> 47 </span> -<span id="L48" class="LineNr"> 48 </span> <span class="subxComment"># initialize segment registers</span> -<span id="L49" class="LineNr"> 49 </span> <span class="subxComment"># this isn't always needed, but the recommendation is to not make assumptions</span> -<span id="L50" class="LineNr"> 50 </span> b8 00 00 <span class="subxComment"># ax <- 0</span> -<span id="L51" class="LineNr"> 51 </span> 8e d8 <span class="subxComment"># ds <- ax</span> -<span id="L52" class="LineNr"> 52 </span> 8e d0 <span class="subxComment"># ss <- ax</span> -<span id="L53" class="LineNr"> 53 </span> 8e c0 <span class="subxComment"># es <- ax</span> -<span id="L54" class="LineNr"> 54 </span> 8e e0 <span class="subxComment"># fs <- ax</span> -<span id="L55" class="LineNr"> 55 </span> 8e e8 <span class="subxComment"># gs <- ax</span> -<span id="L56" class="LineNr"> 56 </span> -<span id="L57" class="LineNr"> 57 </span> <span class="subxComment"># We don't read or write the stack before we get to 32-bit mode. No function</span> -<span id="L58" class="LineNr"> 58 </span> <span class="subxComment"># calls, so we don't need to initialize the stack.</span> -<span id="L59" class="LineNr"> 59 </span> -<span id="L60" class="LineNr"> 60 </span><span class="subxComment"># 0e:</span> -<span id="L61" class="LineNr"> 61 </span> <span class="subxComment"># load some sectors from disk</span> -<span id="L62" class="LineNr"> 62 </span> b4 02 <span class="subxComment"># ah <- 2 # read sectors from disk</span> -<span id="L63" class="LineNr"> 63 </span> <span class="subxComment"># dl comes conveniently initialized at boot time with the index of the device being booted</span> -<span id="L64" class="LineNr"> 64 </span> b5 00 <span class="subxComment"># ch <- 0 # cylinder 0</span> -<span id="L65" class="LineNr"> 65 </span> b6 00 <span class="subxComment"># dh <- 0 # track 0</span> -<span id="L66" class="LineNr"> 66 </span> b1 02 <span class="subxComment"># cl <- 2 # second sector, 1-based</span> -<span id="L67" class="LineNr"> 67 </span> b0 80 <span class="subxComment"># al <- 128 # number of sectors to read; TODO - all sectors might need to be in a single track on real hardware (so 63 sectors at most including the boot sector)</span> -<span id="L68" class="LineNr"> 68 </span> <span class="subxComment"># address to write sectors to = es:bx = 0x7e00, contiguous with boot segment</span> -<span id="L69" class="LineNr"> 69 </span> bb 00 00 <span class="subxComment"># bx <- 0</span> -<span id="L70" class="LineNr"> 70 </span> 8e c3 <span class="subxComment"># es <- bx</span> -<span id="L71" class="LineNr"> 71 </span> bb 00 7e <span class="subxComment"># bx <- 0x7e00 [label]</span> -<span id="L72" class="LineNr"> 72 </span> cd 13 <span class="subxComment"># int 13h, BIOS disk service</span> -<span id="L73" class="LineNr"> 73 </span> 0f 82 8a 00 <span class="subxComment"># jump-if-carry disk-error [label]</span> -<span id="L74" class="LineNr"> 74 </span> -<span id="L75" class="LineNr"> 75 </span><span class="subxComment"># 26:</span> -<span id="L76" class="LineNr"> 76 </span> <span class="subxComment"># undo the A20 hack: <a href="https://en.wikipedia.org/wiki/A20_line">https://en.wikipedia.org/wiki/A20_line</a></span> -<span id="L77" class="LineNr"> 77 </span> <span class="subxComment"># this is from <a href="https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S">https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S</a></span> -<span id="L78" class="LineNr"> 78 </span> <span class="subxComment"># seta20.1:</span> -<span id="L79" class="LineNr"> 79 </span> e4 64 <span class="subxComment"># al <- port 0x64</span> -<span id="L80" class="LineNr"> 80 </span> a8 02 <span class="subxComment"># set zf if bit 1 (second-least significant) is not set</span> -<span id="L81" class="LineNr"> 81 </span> 75 fa <span class="subxComment"># if zf not set, goto seta20.1 (-6)</span> -<span id="L82" class="LineNr"> 82 </span> -<span id="L83" class="LineNr"> 83 </span> b0 d1 <span class="subxComment"># al <- 0xd1</span> -<span id="L84" class="LineNr"> 84 </span> e6 64 <span class="subxComment"># port 0x64 <- al</span> -<span id="L85" class="LineNr"> 85 </span> -<span id="L86" class="LineNr"> 86 </span><span class="subxComment"># 30:</span> -<span id="L87" class="LineNr"> 87 </span> <span class="subxComment"># seta20.2:</span> -<span id="L88" class="LineNr"> 88 </span> e4 64 <span class="subxComment"># al <- port 0x64</span> -<span id="L89" class="LineNr"> 89 </span> a8 02 <span class="subxComment"># set zf if bit 1 (second-least significant) is not set</span> -<span id="L90" class="LineNr"> 90 </span> 75 fa <span class="subxComment"># if zf not set, goto seta20.2 (-6)</span> -<span id="L91" class="LineNr"> 91 </span> -<span id="L92" class="LineNr"> 92 </span> b0 df <span class="subxComment"># al <- 0xdf</span> -<span id="L93" class="LineNr"> 93 </span> e6 64 <span class="subxComment"># port 0x64 <- al</span> -<span id="L94" class="LineNr"> 94 </span> -<span id="L95" class="LineNr"> 95 </span><span class="subxComment"># 3a:</span> -<span id="L96" class="LineNr"> 96 </span> <span class="subxComment"># adjust video mode</span> -<span id="L97" class="LineNr"> 97 </span> b4 4f <span class="subxComment"># ah <- 4f (VBE)</span> -<span id="L98" class="LineNr"> 98 </span> b0 02 <span class="subxComment"># al <- 02 (set video mode)</span> -<span id="L99" class="LineNr"> 99 </span> bb 05 41 <span class="subxComment"># bx <- 0x0105 (graphics 1024x768x256</span> -<span id="L100" class="LineNr">100 </span> <span class="subxComment"># 0x4000 bit = configure linear frame buffer in Bochs emulator; hopefully this doesn't hurt anything when running natively)</span> -<span id="L101" class="LineNr">101 </span> <span class="subxComment"># fallback mode: 0x0101 (640x480x256)</span> -<span id="L102" class="LineNr">102 </span> cd 10 <span class="subxComment"># int 10h, Vesa BIOS extensions</span> -<span id="L103" class="LineNr">103 </span> -<span id="L104" class="LineNr">104 </span><span class="subxComment"># 43:</span> -<span id="L105" class="LineNr">105 </span> <span class="subxComment"># load information for the (hopefully) current video mode</span> -<span id="L106" class="LineNr">106 </span> <span class="subxComment"># mostly just for the address to the linear frame buffer</span> -<span id="L107" class="LineNr">107 </span> b4 4f <span class="subxComment"># ah <- 4f (VBE)</span> -<span id="L108" class="LineNr">108 </span> b0 01 <span class="subxComment"># al <- 01 (get video mode)</span> -<span id="L109" class="LineNr">109 </span> b9 07 01 <span class="subxComment"># cx <- 0x0107 (mode we requested)</span> -<span id="L110" class="LineNr">110 </span> bf 00 7f <span class="subxComment"># di <- 0x7f00 (video mode info) [label]</span> -<span id="L111" class="LineNr">111 </span> cd 10 -<span id="L112" class="LineNr">112 </span> -<span id="L113" class="LineNr">113 </span><span class="subxComment"># 4f:</span> -<span id="L114" class="LineNr">114 </span> <span class="subxComment"># switch to 32-bit mode</span> -<span id="L115" class="LineNr">115 </span> 0f 01 16 <span class="subxComment"># lgdt 00/mod/indirect 010/subop 110/rm/use-disp16</span> -<span id="L116" class="LineNr">116 </span> a0 7c <span class="subxComment"># *gdt_descriptor [label]</span> -<span id="L117" class="LineNr">117 </span> 0f 20 c0 <span class="subxComment"># eax <- cr0</span> -<span id="L118" class="LineNr">118 </span> 66 83 c8 01 <span class="subxComment"># eax <- or 0x1</span> -<span id="L119" class="LineNr">119 </span> 0f 22 c0 <span class="subxComment"># cr0 <- eax</span> -<span id="L120" class="LineNr">120 </span> ea e0 7c 08 00 <span class="subxComment"># far jump to initialize_32bit_mode after setting cs to the record at offset 8 in the gdt (gdt_code) [label]</span> -<span id="L121" class="LineNr">121 </span> -<span id="L122" class="LineNr">122 </span><span class="subxComment"># padding</span> -<span id="L123" class="LineNr">123 </span><span class="subxComment"># 63:</span> -<span id="L124" class="LineNr">124 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L125" class="LineNr">125 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L126" class="LineNr">126 </span> -<span id="L127" class="LineNr">127 </span><span class="subxComment">## GDT: 3 records of 8 bytes each</span> -<span id="L128" class="LineNr">128 </span> -<span id="L129" class="LineNr">129 </span><span class="subxComment"># 80:</span> -<span id="L130" class="LineNr">130 </span><span class="subxComment"># gdt_start:</span> -<span id="L131" class="LineNr">131 </span><span class="subxComment"># gdt_null: mandatory null descriptor</span> -<span id="L132" class="LineNr">132 </span> 00 00 00 00 00 00 00 00 -<span id="L133" class="LineNr">133 </span><span class="subxComment"># gdt_code: (offset 8 from gdt_start)</span> -<span id="L134" class="LineNr">134 </span> ff ff <span class="subxComment"># limit[0:16]</span> -<span id="L135" class="LineNr">135 </span> 00 00 00 <span class="subxComment"># base[0:24]</span> -<span id="L136" class="LineNr">136 </span> 9a <span class="subxComment"># 1/present 00/privilege 1/descriptor type = 1001b</span> -<span id="L137" class="LineNr">137 </span> <span class="subxComment"># 1/code 0/conforming 1/readable 0/accessed = 1010b</span> -<span id="L138" class="LineNr">138 </span> cf <span class="subxComment"># 1/granularity 1/32-bit 0/64-bit-segment 0/AVL = 1100b</span> -<span id="L139" class="LineNr">139 </span> <span class="subxComment"># limit[16:20] = 1111b</span> -<span id="L140" class="LineNr">140 </span> 00 <span class="subxComment"># base[24:32]</span> -<span id="L141" class="LineNr">141 </span><span class="subxComment"># gdt_data: (offset 16 from gdt_start)</span> -<span id="L142" class="LineNr">142 </span> ff ff <span class="subxComment"># limit[0:16]</span> -<span id="L143" class="LineNr">143 </span> 00 00 00 <span class="subxComment"># base[0:24]</span> -<span id="L144" class="LineNr">144 </span> 92 <span class="subxComment"># 1/present 00/privilege 1/descriptor type = 1001b</span> -<span id="L145" class="LineNr">145 </span> <span class="subxComment"># 0/data 0/conforming 1/readable 0/accessed = 0010b</span> -<span id="L146" class="LineNr">146 </span> cf <span class="subxComment"># same as gdt_code</span> -<span id="L147" class="LineNr">147 </span> 00 <span class="subxComment"># base[24:32]</span> -<span id="L148" class="LineNr">148 </span><span class="subxComment"># gdt_end:</span> -<span id="L149" class="LineNr">149 </span> -<span id="L150" class="LineNr">150 </span><span class="subxComment"># padding</span> -<span id="L151" class="LineNr">151 </span><span class="subxComment"># 98:</span> -<span id="L152" class="LineNr">152 </span> 00 00 00 00 00 00 00 00 -<span id="L153" class="LineNr">153 </span> -<span id="L154" class="LineNr">154 </span><span class="subxComment"># a0:</span> -<span id="L155" class="LineNr">155 </span><span class="subxComment"># gdt_descriptor:</span> -<span id="L156" class="LineNr">156 </span> 17 00 <span class="subxComment"># final index of gdt = gdt_end - gdt_start - 1</span> -<span id="L157" class="LineNr">157 </span> 80 7c 00 00 <span class="subxComment"># start = gdt_start [label]</span> -<span id="L158" class="LineNr">158 </span> -<span id="L159" class="LineNr">159 </span><span class="subxComment"># padding</span> -<span id="L160" class="LineNr">160 </span><span class="subxComment"># a5:</span> -<span id="L161" class="LineNr">161 </span> 00 00 00 00 00 00 00 00 00 00 -<span id="L162" class="LineNr">162 </span> -<span id="L163" class="LineNr">163 </span><span class="subxComment"># b0:</span> -<span id="L164" class="LineNr">164 </span><span class="subxComment"># disk_error:</span> -<span id="L165" class="LineNr">165 </span> <span class="subxComment"># print 'D' to top-left of screen to indicate disk error</span> -<span id="L166" class="LineNr">166 </span> <span class="subxComment"># *0xb8000 <- 0x0f44</span> -<span id="L167" class="LineNr">167 </span> <span class="subxComment"># bx <- 0xb800</span> -<span id="L168" class="LineNr">168 </span> bb 00 b8 -<span id="L169" class="LineNr">169 </span> <span class="subxComment"># ds <- bx</span> -<span id="L170" class="LineNr">170 </span> 8e db <span class="subxComment"># 11b/mod 011b/reg/ds 011b/rm/bx</span> -<span id="L171" class="LineNr">171 </span> <span class="subxComment"># al <- 'D'</span> -<span id="L172" class="LineNr">172 </span> b0 44 -<span id="L173" class="LineNr">173 </span> <span class="subxComment"># ah <- 0x0f # white on black</span> -<span id="L174" class="LineNr">174 </span> b4 0f -<span id="L175" class="LineNr">175 </span> <span class="subxComment"># bx <- 0</span> -<span id="L176" class="LineNr">176 </span> bb 00 00 -<span id="L177" class="LineNr">177 </span> <span class="subxComment"># *ds:bx <- ax</span> -<span id="L178" class="LineNr">178 </span> 89 07 <span class="subxComment"># 00b/mod/indirect 000b/reg/ax 111b/rm/bx</span> -<span id="L179" class="LineNr">179 </span> -<span id="L180" class="LineNr">180 </span>e9 fb ff <span class="subxComment"># loop forever</span> -<span id="L181" class="LineNr">181 </span> -<span id="L182" class="LineNr">182 </span><span class="subxComment"># padding</span> -<span id="L183" class="LineNr">183 </span><span class="subxComment"># c1:</span> -<span id="L184" class="LineNr">184 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L185" class="LineNr">185 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L186" class="LineNr">186 </span> -<span id="L187" class="LineNr">187 </span><span class="subxComment">## 32-bit code from this point (still some instructions not in SubX)</span> -<span id="L188" class="LineNr">188 </span> -<span id="L189" class="LineNr">189 </span><span class="subxComment"># e0:</span> -<span id="L190" class="LineNr">190 </span><span class="subxComment"># initialize_32bit_mode:</span> -<span id="L191" class="LineNr">191 </span> 66 b8 10 00 <span class="subxComment"># ax <- offset 16 from gdt_start</span> -<span id="L192" class="LineNr">192 </span> 8e d8 <span class="subxComment"># ds <- ax</span> -<span id="L193" class="LineNr">193 </span> 8e d0 <span class="subxComment"># ss <- ax</span> -<span id="L194" class="LineNr">194 </span> 8e c0 <span class="subxComment"># es <- ax</span> -<span id="L195" class="LineNr">195 </span> 8e e0 <span class="subxComment"># fs <- ax</span> -<span id="L196" class="LineNr">196 </span> 8e e8 <span class="subxComment"># gs <- ax</span> -<span id="L197" class="LineNr">197 </span> -<span id="L198" class="LineNr">198 </span> <span class="subxComment"># load interrupt handlers</span> -<span id="L199" class="LineNr">199 </span> 0f 01 1d <span class="subxComment"># lidt 00/mod/indirect 011/subop 101/rm32/use-disp32</span> -<span id="L200" class="LineNr">200 </span> f8 7d 00 00 <span class="subxComment"># *idt_descriptor [label]</span> -<span id="L201" class="LineNr">201 </span> -<span id="L202" class="LineNr">202 </span> <span class="subxComment"># For now, not bothering reprogramming the IRQ to not conflict with software</span> -<span id="L203" class="LineNr">203 </span> <span class="subxComment"># exceptions.</span> -<span id="L204" class="LineNr">204 </span> <span class="subxComment"># <a href="https://wiki.osdev.org/index.php?title=8259_PIC&oldid=24650#Protected_Mode">https://wiki.osdev.org/index.php?title=8259_PIC&oldid=24650#Protected_Mode</a></span> -<span id="L205" class="LineNr">205 </span> <span class="subxComment">#</span> -<span id="L206" class="LineNr">206 </span> <span class="subxComment"># Interrupt 1 (keyboard) conflicts with debugger faults. We don't use a</span> -<span id="L207" class="LineNr">207 </span> <span class="subxComment"># debugger.</span> -<span id="L208" class="LineNr">208 </span> <span class="subxComment"># Reference:</span> -<span id="L209" class="LineNr">209 </span> <span class="subxComment"># <a href="https://wiki.osdev.org/Exceptions">https://wiki.osdev.org/Exceptions</a></span> -<span id="L210" class="LineNr">210 </span> -<span id="L211" class="LineNr">211 </span> <span class="subxComment"># enable keyboard IRQ (1)</span> -<span id="L212" class="LineNr">212 </span> b0 fd <span class="subxComment"># al <- 0xfd # disable mask for IRQ1</span> -<span id="L213" class="LineNr">213 </span> e6 21 <span class="subxComment"># port 0x21 <- al</span> -<span id="L214" class="LineNr">214 </span> -<span id="L215" class="LineNr">215 </span> <span class="subxComment"># initialization is done; enable interrupts</span> -<span id="L216" class="LineNr">216 </span> fb -<span id="L217" class="LineNr">217 </span> e9 01 13 00 00 <span class="subxComment"># jump to 0x9000 [label]</span> -<span id="L218" class="LineNr">218 </span> -<span id="L219" class="LineNr">219 </span><span class="subxComment"># padding</span> -<span id="L220" class="LineNr">220 </span><span class="subxComment"># ff:</span> -<span id="L221" class="LineNr">221 </span> 00 -<span id="L222" class="LineNr">222 </span> -<span id="L223" class="LineNr">223 </span><span class="subxComment"># 100:</span> -<span id="L224" class="LineNr">224 </span><span class="subxComment"># null interrupt handler:</span> -<span id="L225" class="LineNr">225 </span> cf <span class="subxComment"># iret</span> -<span id="L226" class="LineNr">226 </span> -<span id="L227" class="LineNr">227 </span><span class="subxComment"># padding</span> -<span id="L228" class="LineNr">228 </span><span class="subxComment"># 101:</span> -<span id="L229" class="LineNr">229 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L230" class="LineNr">230 </span> -<span id="L231" class="LineNr">231 </span><span class="subxComment"># 110:</span> -<span id="L232" class="LineNr">232 </span><span class="subxComment"># keyboard interrupt handler:</span> -<span id="L233" class="LineNr">233 </span> <span class="subxComment"># prologue</span> -<span id="L234" class="LineNr">234 </span> fa <span class="subxComment"># disable interrupts</span> -<span id="L235" class="LineNr">235 </span> 60 <span class="subxComment"># push all registers to stack</span> -<span id="L236" class="LineNr">236 </span> <span class="subxComment"># acknowledge interrupt</span> -<span id="L237" class="LineNr">237 </span> b0 20 <span class="subxComment"># al <- 0x20</span> -<span id="L238" class="LineNr">238 </span> e6 20 <span class="subxComment"># port 0x20 <- al</span> -<span id="L239" class="LineNr">239 </span> <span class="subxComment"># read status into eax</span> -<span id="L240" class="LineNr">240 </span> 31 c0 <span class="subxComment"># eax <- xor eax; 11/direct 000/r32/eax 000/rm32/eax</span> -<span id="L241" class="LineNr">241 </span> e4 64 <span class="subxComment"># al <- port 0x64</span> -<span id="L242" class="LineNr">242 </span> <span class="subxComment"># if (status & 0x1) == 0, return</span> -<span id="L243" class="LineNr">243 </span> 24 01 <span class="subxComment"># al <- and 0x1</span> -<span id="L244" class="LineNr">244 </span> 3c 00 <span class="subxComment"># compare al, 0</span> -<span id="L245" class="LineNr">245 </span> 74 39 <span class="subxComment"># jump to epilogue if = [label]</span> -<span id="L246" class="LineNr">246 </span><span class="subxComment"># 120:</span> -<span id="L247" class="LineNr">247 </span> <span class="subxComment"># if keyboard buffer is full, return</span> -<span id="L248" class="LineNr">248 </span> 31 c9 <span class="subxComment"># ecx <- xor ecx; 11/direct 001/r32/ecx 001/rm32/ecx</span> -<span id="L249" class="LineNr">249 </span> <span class="subxS1Comment"># . var index/ecx: byte</span> -<span id="L250" class="LineNr">250 </span> 8a <span class="subxComment"># copy m8 at r32 to r8</span> -<span id="L251" class="LineNr">251 </span> 0d <span class="subxComment"># 00/mod/indirect 001/r8/cl 101/rm32/use-disp32</span> -<span id="L252" class="LineNr">252 </span> c8 7d 00 00 <span class="subxComment"># disp32 [label]</span> -<span id="L253" class="LineNr">253 </span> <span class="subxS1Comment"># . al = *(keyboard buffer + index)</span> -<span id="L254" class="LineNr">254 </span> 8a <span class="subxComment"># copy m8 at r32 to r8</span> -<span id="L255" class="LineNr">255 </span> 81 <span class="subxComment"># 10/mod/*+disp32 000/r8/al 001/rm32/ecx</span> -<span id="L256" class="LineNr">256 </span> d0 7d 00 00 <span class="subxComment"># disp32 [label]</span> -<span id="L257" class="LineNr">257 </span> <span class="subxS1Comment"># . if (al != 0) return</span> -<span id="L258" class="LineNr">258 </span> 3c 00 <span class="subxComment"># compare al, 0</span> -<span id="L259" class="LineNr">259 </span><span class="subxComment"># 130:</span> -<span id="L260" class="LineNr">260 </span> 75 27 <span class="subxComment"># jump to epilogue if != [label]</span> -<span id="L261" class="LineNr">261 </span> <span class="subxComment"># read keycode into al</span> -<span id="L262" class="LineNr">262 </span> e4 60 <span class="subxComment"># al <- port 0x60</span> -<span id="L263" class="LineNr">263 </span> <span class="subxComment"># if (al & 0x80) a key is being lifted; return</span> -<span id="L264" class="LineNr">264 </span> 50 <span class="subxComment"># push eax</span> -<span id="L265" class="LineNr">265 </span> 24 80 <span class="subxComment"># al <- and 0x80</span> -<span id="L266" class="LineNr">266 </span> 3c 00 <span class="subxComment"># compare al, 0</span> -<span id="L267" class="LineNr">267 </span> 58 <span class="subxComment"># pop to eax (without touching flags)</span> -<span id="L268" class="LineNr">268 </span> 75 1d <span class="subxComment"># jump to epilogue if != [label]</span> -<span id="L269" class="LineNr">269 </span><span class="subxComment"># 13c:</span> -<span id="L270" class="LineNr">270 </span> <span class="subxComment"># al <- *(keyboard normal map + eax)</span> -<span id="L271" class="LineNr">271 </span> 8a <span class="subxComment"># copy m8 at rm32 to r8</span> -<span id="L272" class="LineNr">272 </span> 80 <span class="subxComment"># 10/mod/*+disp32 000/r8/al 000/rm32/eax</span> -<span id="L273" class="LineNr">273 </span> 00 80 00 00 <span class="subxComment"># disp32 [label]</span> -<span id="L274" class="LineNr">274 </span> <span class="subxComment"># if there's no character mapping, return</span> -<span id="L275" class="LineNr">275 </span> 3c 00 <span class="subxComment"># compare al, 0</span> -<span id="L276" class="LineNr">276 </span> 74 13 <span class="subxComment"># jump to epilogue if = [label]</span> -<span id="L277" class="LineNr">277 </span><span class="subxComment"># 146:</span> -<span id="L278" class="LineNr">278 </span> <span class="subxComment"># store al in keyboard buffer</span> -<span id="L279" class="LineNr">279 </span> 88 <span class="subxComment"># copy r8 to m8 at r32</span> -<span id="L280" class="LineNr">280 </span> 81 <span class="subxComment"># 10/mod/*+disp32 000/r8/al 001/rm32/ecx</span> -<span id="L281" class="LineNr">281 </span> d0 7d 00 00 <span class="subxComment"># disp32 [label]</span> -<span id="L282" class="LineNr">282 </span><span class="subxComment"># 14c:</span> -<span id="L283" class="LineNr">283 </span> <span class="subxComment"># increment index</span> -<span id="L284" class="LineNr">284 </span> fe <span class="subxComment"># increment byte</span> -<span id="L285" class="LineNr">285 </span> 05 <span class="subxComment"># 00/mod/indirect 000/subop/increment 101/rm32/use-disp32</span> -<span id="L286" class="LineNr">286 </span> c8 7d 00 00 <span class="subxComment"># disp32 [label]</span> -<span id="L287" class="LineNr">287 </span> <span class="subxComment"># clear top nibble of index (keyboard buffer is circular)</span> -<span id="L288" class="LineNr">288 </span> 80 <span class="subxComment"># and byte</span> -<span id="L289" class="LineNr">289 </span> 25 <span class="subxComment"># 00/mod/indirect 100/subop/and 101/rm32/use-disp32</span> -<span id="L290" class="LineNr">290 </span> c8 7d 00 00 <span class="subxComment"># disp32 [label]</span> -<span id="L291" class="LineNr">291 </span> 0f <span class="subxComment"># imm8</span> -<span id="L292" class="LineNr">292 </span><span class="subxComment"># 159:</span> -<span id="L293" class="LineNr">293 </span> <span class="subxComment"># epilogue</span> -<span id="L294" class="LineNr">294 </span> 61 <span class="subxComment"># pop all registers</span> -<span id="L295" class="LineNr">295 </span> fb <span class="subxComment"># enable interrupts</span> -<span id="L296" class="LineNr">296 </span> cf <span class="subxComment"># iret</span> -<span id="L297" class="LineNr">297 </span> -<span id="L298" class="LineNr">298 </span><span class="subxComment"># padding</span> -<span id="L299" class="LineNr">299 </span><span class="subxComment"># 15c:</span> -<span id="L300" class="LineNr">300 </span> 00 00 00 00 -<span id="L301" class="LineNr">301 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L302" class="LineNr">302 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L303" class="LineNr">303 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L304" class="LineNr">304 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L305" class="LineNr">305 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L306" class="LineNr">306 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L307" class="LineNr">307 </span>00 00 00 00 00 00 00 00 -<span id="L308" class="LineNr">308 </span> -<span id="L309" class="LineNr">309 </span><span class="subxComment"># 1c8:</span> -<span id="L310" class="LineNr">310 </span><span class="subxComment"># var keyboard circular buffer</span> -<span id="L311" class="LineNr">311 </span><span class="subxComment"># write index: nibble</span> -<span id="L312" class="LineNr">312 </span><span class="subxComment"># still take up 4 bytes so SubX can handle it</span> -<span id="L313" class="LineNr">313 </span> 00 00 00 00 -<span id="L314" class="LineNr">314 </span><span class="subxComment"># 1cc:</span> -<span id="L315" class="LineNr">315 </span><span class="subxComment"># read index: nibble</span> -<span id="L316" class="LineNr">316 </span><span class="subxComment"># still take up 4 bytes so SubX can handle it</span> -<span id="L317" class="LineNr">317 </span> 00 00 00 00 -<span id="L318" class="LineNr">318 </span><span class="subxComment"># 1d0:</span> -<span id="L319" class="LineNr">319 </span><span class="subxComment"># circular buffer: byte[16]</span> -<span id="L320" class="LineNr">320 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L321" class="LineNr">321 </span> -<span id="L322" class="LineNr">322 </span><span class="subxComment"># padding</span> -<span id="L323" class="LineNr">323 </span><span class="subxComment"># 1e0:</span> -<span id="L324" class="LineNr">324 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L325" class="LineNr">325 </span>00 00 00 00 00 00 00 00 -<span id="L326" class="LineNr">326 </span> -<span id="L327" class="LineNr">327 </span><span class="subxComment"># 1f8:</span> -<span id="L328" class="LineNr">328 </span><span class="subxComment"># idt_descriptor:</span> -<span id="L329" class="LineNr">329 </span> ff 00 <span class="subxComment"># idt_end - idt_start - 1</span> -<span id="L330" class="LineNr">330 </span> 00 7e 00 00 <span class="subxComment"># start = idt_start [label]</span> -<span id="L331" class="LineNr">331 </span> -<span id="L332" class="LineNr">332 </span><span class="subxComment"># 1fe:</span> -<span id="L333" class="LineNr">333 </span><span class="subxComment"># final 2 bytes of boot sector</span> -<span id="L334" class="LineNr">334 </span>55 aa -<span id="L335" class="LineNr">335 </span> -<span id="L336" class="LineNr">336 </span><span class="subxComment">## sector 2</span> -<span id="L337" class="LineNr">337 </span><span class="subxComment"># loaded by load_disk, not automatically on boot</span> -<span id="L338" class="LineNr">338 </span> -<span id="L339" class="LineNr">339 </span><span class="subxComment"># offset 200 (address 0x7e00): interrupt descriptor table</span> -<span id="L340" class="LineNr">340 </span><span class="subxComment"># 32 entries * 8 bytes each = 256 bytes (0x100)</span> -<span id="L341" class="LineNr">341 </span><span class="subxComment"># idt_start:</span> -<span id="L342" class="LineNr">342 </span> -<span id="L343" class="LineNr">343 </span>00 00 00 00 00 00 00 00 -<span id="L344" class="LineNr">344 </span>00 00 00 00 00 00 00 00 -<span id="L345" class="LineNr">345 </span>00 00 00 00 00 00 00 00 -<span id="L346" class="LineNr">346 </span>00 00 00 00 00 00 00 00 -<span id="L347" class="LineNr">347 </span>00 00 00 00 00 00 00 00 -<span id="L348" class="LineNr">348 </span>00 00 00 00 00 00 00 00 -<span id="L349" class="LineNr">349 </span>00 00 00 00 00 00 00 00 -<span id="L350" class="LineNr">350 </span>00 00 00 00 00 00 00 00 -<span id="L351" class="LineNr">351 </span> -<span id="L352" class="LineNr">352 </span><span class="subxComment"># By default, BIOS maps IRQ0-7 to interrupt vectors 8-15.</span> -<span id="L353" class="LineNr">353 </span><span class="subxComment"># <a href="https://wiki.osdev.org/index.php?title=Interrupts&oldid=25102#Default_PC_Interrupt_Vector_Assignment">https://wiki.osdev.org/index.php?title=Interrupts&oldid=25102#Default_PC_Interrupt_Vector_Assignment</a></span> -<span id="L354" class="LineNr">354 </span> -<span id="L355" class="LineNr">355 </span><span class="subxComment"># entry 8: clock</span> -<span id="L356" class="LineNr">356 </span> 00 7d <span class="subxComment"># target[0:16] = null interrupt handler [label]</span> -<span id="L357" class="LineNr">357 </span> 08 00 <span class="subxComment"># segment selector (gdt_code)</span> -<span id="L358" class="LineNr">358 </span> 00 <span class="subxComment"># unused</span> -<span id="L359" class="LineNr">359 </span> 8e <span class="subxComment"># 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate</span> -<span id="L360" class="LineNr">360 </span> 00 00 <span class="subxComment"># target[16:32]</span> -<span id="L361" class="LineNr">361 </span> -<span id="L362" class="LineNr">362 </span><span class="subxComment"># entry 9: keyboard</span> -<span id="L363" class="LineNr">363 </span> 10 7d <span class="subxComment"># target[0:16] = keyboard interrupt handler [label]</span> -<span id="L364" class="LineNr">364 </span> 08 00 <span class="subxComment"># segment selector (gdt_code)</span> -<span id="L365" class="LineNr">365 </span> 00 <span class="subxComment"># unused</span> -<span id="L366" class="LineNr">366 </span> 8e <span class="subxComment"># 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate</span> -<span id="L367" class="LineNr">367 </span> 00 00 <span class="subxComment"># target[16:32]</span> -<span id="L368" class="LineNr">368 </span> -<span id="L369" class="LineNr">369 </span>00 00 00 00 00 00 00 00 -<span id="L370" class="LineNr">370 </span>00 00 00 00 00 00 00 00 -<span id="L371" class="LineNr">371 </span>00 00 00 00 00 00 00 00 -<span id="L372" class="LineNr">372 </span>00 00 00 00 00 00 00 00 -<span id="L373" class="LineNr">373 </span>00 00 00 00 00 00 00 00 -<span id="L374" class="LineNr">374 </span>00 00 00 00 00 00 00 00 -<span id="L375" class="LineNr">375 </span>00 00 00 00 00 00 00 00 -<span id="L376" class="LineNr">376 </span>00 00 00 00 00 00 00 00 -<span id="L377" class="LineNr">377 </span>00 00 00 00 00 00 00 00 -<span id="L378" class="LineNr">378 </span>00 00 00 00 00 00 00 00 -<span id="L379" class="LineNr">379 </span>00 00 00 00 00 00 00 00 -<span id="L380" class="LineNr">380 </span>00 00 00 00 00 00 00 00 -<span id="L381" class="LineNr">381 </span>00 00 00 00 00 00 00 00 -<span id="L382" class="LineNr">382 </span>00 00 00 00 00 00 00 00 -<span id="L383" class="LineNr">383 </span>00 00 00 00 00 00 00 00 -<span id="L384" class="LineNr">384 </span>00 00 00 00 00 00 00 00 -<span id="L385" class="LineNr">385 </span>00 00 00 00 00 00 00 00 -<span id="L386" class="LineNr">386 </span>00 00 00 00 00 00 00 00 -<span id="L387" class="LineNr">387 </span>00 00 00 00 00 00 00 00 -<span id="L388" class="LineNr">388 </span>00 00 00 00 00 00 00 00 -<span id="L389" class="LineNr">389 </span>00 00 00 00 00 00 00 00 -<span id="L390" class="LineNr">390 </span>00 00 00 00 00 00 00 00 -<span id="L391" class="LineNr">391 </span><span class="subxComment"># idt_end:</span> -<span id="L392" class="LineNr">392 </span> -<span id="L393" class="LineNr">393 </span><span class="subxComment"># offset 300 (address 0x7f00):</span> -<span id="L394" class="LineNr">394 </span><span class="subxComment"># video mode info:</span> -<span id="L395" class="LineNr">395 </span> 00 00 <span class="subxComment"># attributes</span> -<span id="L396" class="LineNr">396 </span> 00 <span class="subxComment"># winA</span> -<span id="L397" class="LineNr">397 </span> 00 <span class="subxComment"># winB</span> -<span id="L398" class="LineNr">398 </span><span class="subxComment"># 304</span> -<span id="L399" class="LineNr">399 </span> 00 00 <span class="subxComment"># granularity</span> -<span id="L400" class="LineNr">400 </span> 00 00 <span class="subxComment"># winsize</span> -<span id="L401" class="LineNr">401 </span><span class="subxComment"># 308</span> -<span id="L402" class="LineNr">402 </span> 00 00 <span class="subxComment"># segmentA</span> -<span id="L403" class="LineNr">403 </span> 00 00 <span class="subxComment"># segmentB</span> -<span id="L404" class="LineNr">404 </span><span class="subxComment"># 30c</span> -<span id="L405" class="LineNr">405 </span> 00 00 00 00 <span class="subxComment"># realFctPtr (who knows)</span> -<span id="L406" class="LineNr">406 </span><span class="subxComment"># 310</span> -<span id="L407" class="LineNr">407 </span> 00 00 <span class="subxComment"># pitch</span> -<span id="L408" class="LineNr">408 </span> 00 00 <span class="subxComment"># Xres</span> -<span id="L409" class="LineNr">409 </span><span class="subxComment"># 314</span> -<span id="L410" class="LineNr">410 </span> 00 00 <span class="subxComment"># Yres</span> -<span id="L411" class="LineNr">411 </span> 00 00 <span class="subxComment"># Wchar Ychar</span> -<span id="L412" class="LineNr">412 </span><span class="subxComment"># 318</span> -<span id="L413" class="LineNr">413 </span> 00 <span class="subxComment"># planes</span> -<span id="L414" class="LineNr">414 </span> 00 <span class="subxComment"># bpp</span> -<span id="L415" class="LineNr">415 </span> 00 <span class="subxComment"># banks</span> -<span id="L416" class="LineNr">416 </span> 00 <span class="subxComment"># memory_model</span> -<span id="L417" class="LineNr">417 </span><span class="subxComment"># 31c</span> -<span id="L418" class="LineNr">418 </span> 00 <span class="subxComment"># bank_size</span> -<span id="L419" class="LineNr">419 </span> 00 <span class="subxComment"># image_pages</span> -<span id="L420" class="LineNr">420 </span> 00 <span class="subxComment"># reserved</span> -<span id="L421" class="LineNr">421 </span><span class="subxComment"># 31f</span> -<span id="L422" class="LineNr">422 </span> 00 00 <span class="subxComment"># red_mask red_position</span> -<span id="L423" class="LineNr">423 </span> 00 00 <span class="subxComment"># green_mask green_position</span> -<span id="L424" class="LineNr">424 </span> 00 00 <span class="subxComment"># blue_mask blue_position</span> -<span id="L425" class="LineNr">425 </span> 00 00 <span class="subxComment"># rsv_mask rsv_position</span> -<span id="L426" class="LineNr">426 </span> 00 <span class="subxComment"># directcolor_attributes</span> -<span id="L427" class="LineNr">427 </span><span class="subxComment"># 328</span> -<span id="L428" class="LineNr">428 </span> 00 00 00 00 <span class="subxComment"># physbase <== linear frame buffer</span> -<span id="L429" class="LineNr">429 </span> -<span id="L430" class="LineNr">430 </span><span class="subxComment"># 32c</span> -<span id="L431" class="LineNr">431 </span><span class="subxComment"># reserved for video mode info</span> -<span id="L432" class="LineNr">432 </span> 00 00 00 00 -<span id="L433" class="LineNr">433 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L434" class="LineNr">434 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L435" class="LineNr">435 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L436" class="LineNr">436 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L437" class="LineNr">437 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L438" class="LineNr">438 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L439" class="LineNr">439 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L440" class="LineNr">440 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L441" class="LineNr">441 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L442" class="LineNr">442 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L443" class="LineNr">443 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L444" class="LineNr">444 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L445" class="LineNr">445 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -<span id="L446" class="LineNr">446 </span> -<span id="L447" class="LineNr">447 </span><span class="subxComment">## the rest of this file has data</span> -<span id="L448" class="LineNr">448 </span> -<span id="L449" class="LineNr">449 </span><span class="subxComment"># offset 400 (address 0x8000):</span> -<span id="L450" class="Folded">450 </span><span class="Folded">+--161 lines: # translating keys to ASCII -----------------------------------------------------------------------------------------------------------------------------------------------</span> -<span id="L611" class="LineNr">611 </span> -<span id="L612" class="LineNr">612 </span><span class="subxComment"># offset c00 (address 0x8800)</span> -<span id="L613" class="Folded">613 </span><span class="Folded">+--236 lines: # Bitmaps for some ASCII characters (soon Unicode) ------------------------------------------------------------------------------------------------------------------------</span> -<span id="L849" class="LineNr">849 </span> -<span id="L850" class="LineNr">850 </span><span class="subxComment"># offset 1400 (address 0x9000)</span> -<span id="L851" class="LineNr">851 </span> -<span id="L852" class="LineNr">852 </span><span class="subxComment"># vim:ft=subx</span> +<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Code for the first few disk sectors that all programs in this directory need:</span> +<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># - load sectors past the first (using BIOS primitives) since only the first is available by default</span> +<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># - if this fails, print 'D' at top-left of screen and halt</span> +<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># - initialize a minimal graphics mode</span> +<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># - switch to 32-bit mode (giving up access to BIOS primitives)</span> +<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># - set up a handler for keyboard events</span> +<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># - jump to start of program</span> +<span id="L8" class="LineNr"> 8 </span><span class="subxComment">#</span> +<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># To convert to a disk image, first prepare a realistically sized disk image:</span> +<span id="L10" class="LineNr"> 10 </span><span class="subxComment"># dd if=/dev/zero of=disk.img count=20160 # 512-byte sectors, so 10MB</span> +<span id="L11" class="LineNr"> 11 </span><span class="subxComment"># Create initial sectors from this file:</span> +<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># ./bootstrap run apps/hex < baremetal/boot.hex > boot.bin</span> +<span id="L13" class="LineNr"> 13 </span><span class="subxComment"># Translate other sectors into a file called a.img</span> +<span id="L14" class="LineNr"> 14 </span><span class="subxComment"># Load all sectors into the disk image:</span> +<span id="L15" class="LineNr"> 15 </span><span class="subxComment"># cat boot.bin a.img > disk.bin</span> +<span id="L16" class="LineNr"> 16 </span><span class="subxComment"># dd if=disk.bin of=disk.img conv=notrunc</span> +<span id="L17" class="LineNr"> 17 </span><span class="subxComment"># To run:</span> +<span id="L18" class="LineNr"> 18 </span><span class="subxComment"># qemu-system-i386 disk.img</span> +<span id="L19" class="LineNr"> 19 </span><span class="subxComment"># Or:</span> +<span id="L20" class="LineNr"> 20 </span><span class="subxComment"># bochs -f baremetal/boot.bochsrc # boot.bochsrc loads disk.img</span> +<span id="L21" class="LineNr"> 21 </span><span class="subxComment">#</span> +<span id="L22" class="LineNr"> 22 </span><span class="subxComment"># Since we start out in 16-bit mode, we need instructions SubX doesn't</span> +<span id="L23" class="LineNr"> 23 </span><span class="subxComment"># support.</span> +<span id="L24" class="LineNr"> 24 </span><span class="subxComment"># This file contains just lowercase hex bytes and comments. It makes liberal</span> +<span id="L25" class="LineNr"> 25 </span><span class="subxComment"># use of:</span> +<span id="L26" class="LineNr"> 26 </span><span class="subxComment"># - comments documenting expected offsets</span> +<span id="L27" class="LineNr"> 27 </span><span class="subxComment"># - size checks on the emitted file (currently: 6144 bytes)</span> +<span id="L28" class="LineNr"> 28 </span><span class="subxComment"># - xxd to eyeball that offsets contain expected bytes</span> +<span id="L29" class="LineNr"> 29 </span><span class="subxComment">#</span> +<span id="L30" class="LineNr"> 30 </span><span class="subxComment"># Programs using this initialization:</span> +<span id="L31" class="LineNr"> 31 </span><span class="subxComment"># - can't use any syscalls</span> +<span id="L32" class="LineNr"> 32 </span><span class="subxComment"># - can't print text to video memory (past these boot sectors)</span> +<span id="L33" class="LineNr"> 33 </span><span class="subxComment"># - must only print raw pixels (256 colors) to video memory (resolution 1024x768)</span> +<span id="L34" class="LineNr"> 34 </span><span class="subxComment"># - must start executing immediately after this file (see outline below)</span> +<span id="L35" class="LineNr"> 35 </span><span class="subxComment">#</span> +<span id="L36" class="LineNr"> 36 </span><span class="subxComment"># Don't panic! This file doesn't contain any loops or function calls. 80% of</span> +<span id="L37" class="LineNr"> 37 </span><span class="subxComment"># it is data. One pass through less than 1KB of code (there's lots of</span> +<span id="L38" class="LineNr"> 38 </span><span class="subxComment"># padding), and then we jump into a better notation. The rest of the stack</span> +<span id="L39" class="LineNr"> 39 </span><span class="subxComment"># (really only in a couple of slightly higher-level places) only needs to know</span> +<span id="L40" class="LineNr"> 40 </span><span class="subxComment"># a few magic constants:</span> +<span id="L41" class="LineNr"> 41 </span><span class="subxComment"># Video memory: start is stored at 0x8128</span> +<span id="L42" class="LineNr"> 42 </span><span class="subxComment"># Keyboard buffer: starts at 0x8028</span> +<span id="L43" class="LineNr"> 43 </span> +<span id="L44" class="LineNr"> 44 </span><span class="subxComment"># Outline of this file with offsets and the addresses they map to at run-time:</span> +<span id="L45" class="LineNr"> 45 </span><span class="subxComment"># -- 16-bit mode code</span> +<span id="L46" class="LineNr"> 46 </span><span class="subxComment"># offset 0 (address 7c00): boot code</span> +<span id="L47" class="LineNr"> 47 </span><span class="subxComment"># -- 16-bit mode data</span> +<span id="L48" class="LineNr"> 48 </span><span class="subxComment"># e0 (address 7c80) global descriptor table</span> +<span id="L49" class="LineNr"> 49 </span><span class="subxComment"># f8 (address 7ca0) <== gdt_descriptor</span> +<span id="L50" class="LineNr"> 50 </span><span class="subxComment"># -- 32-bit mode code</span> +<span id="L51" class="LineNr"> 51 </span><span class="subxComment"># offset 100 (address 7d00): boot code</span> +<span id="L52" class="LineNr"> 52 </span><span class="subxComment"># 1fe (address 7dfe) boot sector marker (2 bytes)</span> +<span id="L53" class="LineNr"> 53 </span><span class="subxComment"># offset 200 (address 7e00): interrupt handler code</span> +<span id="L54" class="LineNr"> 54 </span><span class="subxComment"># -- 32-bit mode data</span> +<span id="L55" class="LineNr"> 55 </span><span class="subxComment"># offset 400 (address 8000): handler data</span> +<span id="L56" class="LineNr"> 56 </span><span class="subxComment"># 410 (address 8010): keyboard handler data</span> +<span id="L57" class="LineNr"> 57 </span><span class="subxComment"># 428 (address 8028) <== keyboard buffer</span> +<span id="L58" class="LineNr"> 58 </span><span class="subxComment"># offset 500 (address 8100): video mode data (256 bytes)</span> +<span id="L59" class="LineNr"> 59 </span><span class="subxComment"># 528 (address 8128) <== start of video RAM stored here</span> +<span id="L60" class="LineNr"> 60 </span><span class="subxComment"># offset 600 (address 8200): interrupt descriptor table (1KB)</span> +<span id="L61" class="LineNr"> 61 </span><span class="subxComment"># offset a00 (address 8600): keyboard mappings (1.5KB)</span> +<span id="L62" class="LineNr"> 62 </span><span class="subxComment"># offset 1000 (address 8c00): bitmap font (2KB)</span> +<span id="L63" class="LineNr"> 63 </span><span class="subxComment"># offset 1800 (address 9400): entrypoint for applications (don't forget to adjust survey_baremetal if this changes)</span> +<span id="L64" class="LineNr"> 64 </span> +<span id="L65" class="LineNr"> 65 </span><span class="subxComment"># Other details of the current memory map:</span> +<span id="L66" class="LineNr"> 66 </span><span class="subxComment"># code: first two default-sized disk tracks into [0x00007c00, 0x00017800)</span> +<span id="L67" class="LineNr"> 67 </span><span class="subxComment"># stack grows down from 0x00070000</span> +<span id="L68" class="LineNr"> 68 </span><span class="subxComment"># see below</span> +<span id="L69" class="LineNr"> 69 </span><span class="subxComment"># heap: [0x01000000, 0x02000000)</span> +<span id="L70" class="LineNr"> 70 </span><span class="subxComment"># see baremetal/120allocate.subx</span> +<span id="L71" class="LineNr"> 71 </span><span class="subxComment"># Consult <a href="https://wiki.osdev.org/Memory_Map_(x86)">https://wiki.osdev.org/Memory_Map_(x86)</a> before modifying any of this.</span> +<span id="L72" class="LineNr"> 72 </span> +<span id="L73" class="LineNr"> 73 </span><span class="subxComment">## 16-bit entry point</span> +<span id="L74" class="LineNr"> 74 </span> +<span id="L75" class="LineNr"> 75 </span><span class="subxComment"># Upon reset, the IBM PC:</span> +<span id="L76" class="LineNr"> 76 </span><span class="subxComment"># - loads the first sector (512 bytes)</span> +<span id="L77" class="LineNr"> 77 </span><span class="subxComment"># from some bootable image (see the boot sector marker at the end of this file)</span> +<span id="L78" class="LineNr"> 78 </span><span class="subxComment"># to the address range [0x7c00, 0x7e00)</span> +<span id="L79" class="LineNr"> 79 </span><span class="subxComment"># call this disk read #0</span> +<span id="L80" class="LineNr"> 80 </span><span class="subxComment"># - starts executing code at address 0x7c00</span> +<span id="L81" class="LineNr"> 81 </span> +<span id="L82" class="LineNr"> 82 </span><span class="subxComment"># offset 00 (address 0x7c00):</span> +<span id="L83" class="LineNr"> 83 </span> <span class="subxComment"># disable interrupts for this initialization</span> +<span id="L84" class="LineNr"> 84 </span> fa <span class="subxComment"># cli</span> +<span id="L85" class="LineNr"> 85 </span> +<span id="L86" class="LineNr"> 86 </span> <span class="subxComment"># initialize segment registers</span> +<span id="L87" class="LineNr"> 87 </span> <span class="subxComment"># this isn't always needed, but the recommendation is to not make assumptions</span> +<span id="L88" class="LineNr"> 88 </span> b8 00 00 <span class="subxComment"># ax <- 0</span> +<span id="L89" class="LineNr"> 89 </span> 8e d8 <span class="subxComment"># ds <- ax</span> +<span id="L90" class="LineNr"> 90 </span> 8e c0 <span class="subxComment"># es <- ax</span> +<span id="L91" class="LineNr"> 91 </span> 8e e0 <span class="subxComment"># fs <- ax</span> +<span id="L92" class="LineNr"> 92 </span> 8e e8 <span class="subxComment"># gs <- ax</span> +<span id="L93" class="LineNr"> 93 </span> +<span id="L94" class="LineNr"> 94 </span> <span class="subxComment"># initialize stack to 0x00070000</span> +<span id="L95" class="LineNr"> 95 </span> <span class="subxComment"># We don't read or write the stack before we get to 32-bit mode, but BIOS</span> +<span id="L96" class="LineNr"> 96 </span> <span class="subxComment"># calls do. We need to move the stack in case BIOS initializes it to some</span> +<span id="L97" class="LineNr"> 97 </span> <span class="subxComment"># low address that we want to write code into.</span> +<span id="L98" class="LineNr"> 98 </span> b8 00 70 <span class="subxComment"># ax <- 0x7000</span> +<span id="L99" class="LineNr"> 99 </span> 8e d0 <span class="subxComment"># ss <- ax</span> +<span id="L100" class="LineNr"> 100 </span> bc 00 00 <span class="subxComment"># sp <- 0x0000</span> +<span id="L101" class="LineNr"> 101 </span> +<span id="L102" class="LineNr"> 102 </span><span class="subxComment"># 14:</span> +<span id="L103" class="LineNr"> 103 </span> <span class="subxComment"># disk read #1: load remaining sectors from first two tracks of disk into addresses [0x7e00, 0x17800)</span> +<span id="L104" class="LineNr"> 104 </span> b4 02 <span class="subxComment"># ah <- 2 # read sectors from disk</span> +<span id="L105" class="LineNr"> 105 </span> <span class="subxComment"># dl comes conveniently initialized at boot time with the index of the device being booted</span> +<span id="L106" class="LineNr"> 106 </span> b5 00 <span class="subxComment"># ch <- 0 # cylinder 0</span> +<span id="L107" class="LineNr"> 107 </span> b6 00 <span class="subxComment"># dh <- 0 # track 0</span> +<span id="L108" class="LineNr"> 108 </span> b1 02 <span class="subxComment"># cl <- 2 # second sector, 1-based</span> +<span id="L109" class="LineNr"> 109 </span> b0 7d <span class="subxComment"># al <- 125 # number of sectors to read</span> +<span id="L110" class="LineNr"> 110 </span> <span class="subxComment"># address to write sectors to = es:bx = 0x7e00, contiguous with boot segment</span> +<span id="L111" class="LineNr"> 111 </span> bb 00 00 <span class="subxComment"># bx <- 0</span> +<span id="L112" class="LineNr"> 112 </span> 8e c3 <span class="subxComment"># es <- bx</span> +<span id="L113" class="LineNr"> 113 </span> bb 00 7e <span class="subxComment"># bx <- 0x7e00 [label]</span> +<span id="L114" class="LineNr"> 114 </span> cd 13 <span class="subxComment"># int 13h, BIOS disk service</span> +<span id="L115" class="LineNr"> 115 </span> 0f 82 a3 00 <span class="subxComment"># jump-if-carry disk_error [label]</span> +<span id="L116" class="LineNr"> 116 </span> +<span id="L117" class="LineNr"> 117 </span><span class="subxComment"># 2c:</span> +<span id="L118" class="LineNr"> 118 </span> <span class="subxComment"># undo the A20 hack: <a href="https://en.wikipedia.org/wiki/A20_line">https://en.wikipedia.org/wiki/A20_line</a></span> +<span id="L119" class="LineNr"> 119 </span> <span class="subxComment"># this is from <a href="https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S">https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S</a></span> +<span id="L120" class="LineNr"> 120 </span> <span class="subxComment"># seta20.1:</span> +<span id="L121" class="LineNr"> 121 </span> e4 64 <span class="subxComment"># al <- port 0x64</span> +<span id="L122" class="LineNr"> 122 </span> a8 02 <span class="subxComment"># set zf if bit 1 (second-least significant) is not set</span> +<span id="L123" class="LineNr"> 123 </span> 75 fa <span class="subxComment"># if zf not set, goto seta20.1 (-6)</span> +<span id="L124" class="LineNr"> 124 </span> +<span id="L125" class="LineNr"> 125 </span> b0 d1 <span class="subxComment"># al <- 0xd1</span> +<span id="L126" class="LineNr"> 126 </span> e6 64 <span class="subxComment"># port 0x64 <- al</span> +<span id="L127" class="LineNr"> 127 </span> +<span id="L128" class="LineNr"> 128 </span><span class="subxComment"># 36:</span> +<span id="L129" class="LineNr"> 129 </span> <span class="subxComment"># seta20.2:</span> +<span id="L130" class="LineNr"> 130 </span> e4 64 <span class="subxComment"># al <- port 0x64</span> +<span id="L131" class="LineNr"> 131 </span> a8 02 <span class="subxComment"># set zf if bit 1 (second-least significant) is not set</span> +<span id="L132" class="LineNr"> 132 </span> 75 fa <span class="subxComment"># if zf not set, goto seta20.2 (-6)</span> +<span id="L133" class="LineNr"> 133 </span> +<span id="L134" class="LineNr"> 134 </span> b0 df <span class="subxComment"># al <- 0xdf</span> +<span id="L135" class="LineNr"> 135 </span> e6 64 <span class="subxComment"># port 0x64 <- al</span> +<span id="L136" class="LineNr"> 136 </span> +<span id="L137" class="LineNr"> 137 </span><span class="subxComment"># 40:</span> +<span id="L138" class="LineNr"> 138 </span> <span class="subxComment"># adjust video mode</span> +<span id="L139" class="LineNr"> 139 </span> b4 4f <span class="subxComment"># ah <- 4f (VBE)</span> +<span id="L140" class="LineNr"> 140 </span> b0 02 <span class="subxComment"># al <- 02 (set video mode)</span> +<span id="L141" class="LineNr"> 141 </span> bb 05 41 <span class="subxComment"># bx <- 0x0105 (graphics 1024x768x256</span> +<span id="L142" class="LineNr"> 142 </span> <span class="subxComment"># 0x4000 bit = configure linear frame buffer in Bochs emulator; hopefully this doesn't hurt anything when running natively)</span> +<span id="L143" class="LineNr"> 143 </span> <span class="subxComment"># fallback mode: 0x0101 (640x480x256)</span> +<span id="L144" class="LineNr"> 144 </span> cd 10 <span class="subxComment"># int 10h, Vesa BIOS extensions</span> +<span id="L145" class="LineNr"> 145 </span> +<span id="L146" class="LineNr"> 146 </span><span class="subxComment"># 49:</span> +<span id="L147" class="LineNr"> 147 </span> <span class="subxComment"># load information for the (hopefully) current video mode</span> +<span id="L148" class="LineNr"> 148 </span> <span class="subxComment"># mostly just for the address to the linear frame buffer</span> +<span id="L149" class="LineNr"> 149 </span> b4 4f <span class="subxComment"># ah <- 4f (VBE)</span> +<span id="L150" class="LineNr"> 150 </span> b0 01 <span class="subxComment"># al <- 01 (get video mode)</span> +<span id="L151" class="LineNr"> 151 </span> b9 07 01 <span class="subxComment"># cx <- 0x0107 (mode we requested)</span> +<span id="L152" class="LineNr"> 152 </span> bf 00 81 <span class="subxComment"># di <- 0x7f00 (video mode info) [label]</span> +<span id="L153" class="LineNr"> 153 </span> cd 10 +<span id="L154" class="LineNr"> 154 </span> +<span id="L155" class="LineNr"> 155 </span><span class="subxComment"># 55:</span> +<span id="L156" class="LineNr"> 156 </span> <span class="subxComment"># switch to 32-bit mode</span> +<span id="L157" class="LineNr"> 157 </span> 0f 01 16 <span class="subxComment"># lgdt 00/mod/indirect 010/subop 110/rm/use-disp16</span> +<span id="L158" class="LineNr"> 158 </span> f8 7c <span class="subxComment"># *gdt_descriptor [label]</span> +<span id="L159" class="LineNr"> 159 </span> 0f 20 c0 <span class="subxComment"># eax <- cr0</span> +<span id="L160" class="LineNr"> 160 </span> 66 83 c8 01 <span class="subxComment"># eax <- or 0x1</span> +<span id="L161" class="LineNr"> 161 </span> 0f 22 c0 <span class="subxComment"># cr0 <- eax</span> +<span id="L162" class="LineNr"> 162 </span> ea 00 7d 08 00 <span class="subxComment"># far jump to initialize_32bit_mode after setting cs to the record at offset 8 in the gdt (gdt_code) [label]</span> +<span id="L163" class="LineNr"> 163 </span> +<span id="L164" class="LineNr"> 164 </span><span class="subxComment"># padding</span> +<span id="L165" class="LineNr"> 165 </span><span class="subxComment"># 69:</span> +<span id="L166" class="LineNr"> 166 </span> 00 00 00 00 00 00 00 +<span id="L167" class="LineNr"> 167 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L168" class="LineNr"> 168 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L169" class="LineNr"> 169 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L170" class="LineNr"> 170 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L171" class="LineNr"> 171 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L172" class="LineNr"> 172 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L173" class="LineNr"> 173 </span> +<span id="L174" class="LineNr"> 174 </span><span class="subxComment"># cf:</span> +<span id="L175" class="LineNr"> 175 </span><span class="subxComment"># disk_error:</span> +<span id="L176" class="LineNr"> 176 </span> <span class="subxComment"># print 'D' to top-left of screen to indicate disk error</span> +<span id="L177" class="LineNr"> 177 </span> <span class="subxComment"># *0xb8000 <- 0x0f44</span> +<span id="L178" class="LineNr"> 178 </span> <span class="subxComment"># bx <- 0xb800</span> +<span id="L179" class="LineNr"> 179 </span> bb 00 b8 +<span id="L180" class="LineNr"> 180 </span> <span class="subxComment"># ds <- bx</span> +<span id="L181" class="LineNr"> 181 </span> 8e db <span class="subxComment"># 11b/mod 011b/reg/ds 011b/rm/bx</span> +<span id="L182" class="LineNr"> 182 </span> <span class="subxComment"># al <- 'D'</span> +<span id="L183" class="LineNr"> 183 </span> b0 44 +<span id="L184" class="LineNr"> 184 </span> <span class="subxComment"># ah <- 0x0f # white on black</span> +<span id="L185" class="LineNr"> 185 </span> b4 0f +<span id="L186" class="LineNr"> 186 </span> <span class="subxComment"># bx <- 0</span> +<span id="L187" class="LineNr"> 187 </span> bb 00 00 +<span id="L188" class="LineNr"> 188 </span> <span class="subxComment"># *ds:bx <- ax</span> +<span id="L189" class="LineNr"> 189 </span> 89 07 <span class="subxComment"># 00b/mod/indirect 000b/reg/ax 111b/rm/bx</span> +<span id="L190" class="LineNr"> 190 </span> +<span id="L191" class="LineNr"> 191 </span>e9 fd ff <span class="subxComment"># loop forever</span> +<span id="L192" class="LineNr"> 192 </span> +<span id="L193" class="LineNr"> 193 </span><span class="subxComment">## GDT: 3 records of 8 bytes each</span> +<span id="L194" class="LineNr"> 194 </span> +<span id="L195" class="LineNr"> 195 </span><span class="subxComment"># e0:</span> +<span id="L196" class="LineNr"> 196 </span><span class="subxComment"># gdt_start:</span> +<span id="L197" class="LineNr"> 197 </span><span class="subxComment"># gdt_null: mandatory null descriptor</span> +<span id="L198" class="LineNr"> 198 </span> 00 00 00 00 00 00 00 00 +<span id="L199" class="LineNr"> 199 </span><span class="subxComment"># gdt_code: (offset 8 from gdt_start)</span> +<span id="L200" class="LineNr"> 200 </span> ff ff <span class="subxComment"># limit[0:16]</span> +<span id="L201" class="LineNr"> 201 </span> 00 00 00 <span class="subxComment"># base[0:24]</span> +<span id="L202" class="LineNr"> 202 </span> 9a <span class="subxComment"># 1/present 00/privilege 1/descriptor type = 1001b</span> +<span id="L203" class="LineNr"> 203 </span> <span class="subxComment"># 1/code 0/conforming 1/readable 0/accessed = 1010b</span> +<span id="L204" class="LineNr"> 204 </span> cf <span class="subxComment"># 1/granularity 1/32-bit 0/64-bit-segment 0/AVL = 1100b</span> +<span id="L205" class="LineNr"> 205 </span> <span class="subxComment"># limit[16:20] = 1111b</span> +<span id="L206" class="LineNr"> 206 </span> 00 <span class="subxComment"># base[24:32]</span> +<span id="L207" class="LineNr"> 207 </span><span class="subxComment"># gdt_data: (offset 16 from gdt_start)</span> +<span id="L208" class="LineNr"> 208 </span> ff ff <span class="subxComment"># limit[0:16]</span> +<span id="L209" class="LineNr"> 209 </span> 00 00 00 <span class="subxComment"># base[0:24]</span> +<span id="L210" class="LineNr"> 210 </span> 92 <span class="subxComment"># 1/present 00/privilege 1/descriptor type = 1001b</span> +<span id="L211" class="LineNr"> 211 </span> <span class="subxComment"># 0/data 0/conforming 1/readable 0/accessed = 0010b</span> +<span id="L212" class="LineNr"> 212 </span> cf <span class="subxComment"># same as gdt_code</span> +<span id="L213" class="LineNr"> 213 </span> 00 <span class="subxComment"># base[24:32]</span> +<span id="L214" class="LineNr"> 214 </span><span class="subxComment"># gdt_end:</span> +<span id="L215" class="LineNr"> 215 </span> +<span id="L216" class="LineNr"> 216 </span><span class="subxComment"># f8:</span> +<span id="L217" class="LineNr"> 217 </span><span class="subxComment"># gdt_descriptor:</span> +<span id="L218" class="LineNr"> 218 </span> 17 00 <span class="subxComment"># final index of gdt = gdt_end - gdt_start - 1</span> +<span id="L219" class="LineNr"> 219 </span> e0 7c 00 00 <span class="subxComment"># start = gdt_start [label]</span> +<span id="L220" class="LineNr"> 220 </span> +<span id="L221" class="LineNr"> 221 </span><span class="subxComment"># padding</span> +<span id="L222" class="LineNr"> 222 </span><span class="subxComment"># fe:</span> +<span id="L223" class="LineNr"> 223 </span> 00 00 +<span id="L224" class="LineNr"> 224 </span> +<span id="L225" class="LineNr"> 225 </span><span class="subxComment">## 32-bit code from this point (still some instructions not in SubX)</span> +<span id="L226" class="LineNr"> 226 </span> +<span id="L227" class="LineNr"> 227 </span><span class="subxComment"># offset 100 (address 0x7d00):</span> +<span id="L228" class="LineNr"> 228 </span><span class="subxComment"># initialize_32bit_mode:</span> +<span id="L229" class="LineNr"> 229 </span> 66 b8 10 00 <span class="subxComment"># ax <- offset 16 from gdt_start</span> +<span id="L230" class="LineNr"> 230 </span> 8e d8 <span class="subxComment"># ds <- ax</span> +<span id="L231" class="LineNr"> 231 </span> 8e d0 <span class="subxComment"># ss <- ax</span> +<span id="L232" class="LineNr"> 232 </span> 8e c0 <span class="subxComment"># es <- ax</span> +<span id="L233" class="LineNr"> 233 </span> 8e e0 <span class="subxComment"># fs <- ax</span> +<span id="L234" class="LineNr"> 234 </span> 8e e8 <span class="subxComment"># gs <- ax</span> +<span id="L235" class="LineNr"> 235 </span> +<span id="L236" class="LineNr"> 236 </span><span class="subxComment"># 10e:</span> +<span id="L237" class="LineNr"> 237 </span> bc 00 00 07 00 <span class="subxComment"># esp <- 0x00070000</span> +<span id="L238" class="LineNr"> 238 </span> +<span id="L239" class="LineNr"> 239 </span><span class="subxComment"># 113:</span> +<span id="L240" class="LineNr"> 240 </span> <span class="subxComment"># load interrupt handlers</span> +<span id="L241" class="LineNr"> 241 </span> 0f 01 1d <span class="subxComment"># lidt 00/mod/indirect 011/subop 101/rm32/use-disp32</span> +<span id="L242" class="LineNr"> 242 </span> 00 80 00 00 <span class="subxComment"># *idt_descriptor [label]</span> +<span id="L243" class="LineNr"> 243 </span> +<span id="L244" class="LineNr"> 244 </span> <span class="subxComment"># For now, not bothering reprogramming the IRQ to not conflict with software</span> +<span id="L245" class="LineNr"> 245 </span> <span class="subxComment"># exceptions.</span> +<span id="L246" class="LineNr"> 246 </span> <span class="subxComment"># <a href="https://wiki.osdev.org/index.php?title=8259_PIC&oldid=24650#Protected_Mode">https://wiki.osdev.org/index.php?title=8259_PIC&oldid=24650#Protected_Mode</a></span> +<span id="L247" class="LineNr"> 247 </span> <span class="subxComment">#</span> +<span id="L248" class="LineNr"> 248 </span> <span class="subxComment"># Interrupt 1 (keyboard) conflicts with debugger faults. We don't use a</span> +<span id="L249" class="LineNr"> 249 </span> <span class="subxComment"># debugger.</span> +<span id="L250" class="LineNr"> 250 </span> <span class="subxComment"># Reference:</span> +<span id="L251" class="LineNr"> 251 </span> <span class="subxComment"># <a href="https://wiki.osdev.org/Exceptions">https://wiki.osdev.org/Exceptions</a></span> +<span id="L252" class="LineNr"> 252 </span> +<span id="L253" class="LineNr"> 253 </span><span class="subxComment"># 11a:</span> +<span id="L254" class="LineNr"> 254 </span> <span class="subxComment"># enable keyboard IRQ (1)</span> +<span id="L255" class="LineNr"> 255 </span> b0 fd <span class="subxComment"># al <- 0xfd # disable mask for IRQ1</span> +<span id="L256" class="LineNr"> 256 </span> e6 21 <span class="subxComment"># port 0x21 <- al</span> +<span id="L257" class="LineNr"> 257 </span> +<span id="L258" class="LineNr"> 258 </span><span class="subxComment"># 11e:</span> +<span id="L259" class="LineNr"> 259 </span> <span class="subxComment"># initialization is done; enable interrupts</span> +<span id="L260" class="LineNr"> 260 </span> fb +<span id="L261" class="LineNr"> 261 </span> e9 dc 16 00 00 <span class="subxComment"># jump to 0x9400 [label]</span> +<span id="L262" class="LineNr"> 262 </span> +<span id="L263" class="LineNr"> 263 </span><span class="subxComment"># padding</span> +<span id="L264" class="LineNr"> 264 </span><span class="subxComment"># 124:</span> +<span id="L265" class="LineNr"> 265 </span> 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L266" class="LineNr"> 266 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L267" class="LineNr"> 267 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L268" class="LineNr"> 268 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L269" class="LineNr"> 269 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L270" class="LineNr"> 270 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L271" class="LineNr"> 271 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L272" class="LineNr"> 272 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L273" class="LineNr"> 273 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L274" class="LineNr"> 274 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L275" class="LineNr"> 275 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L276" class="LineNr"> 276 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L277" class="LineNr"> 277 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L278" class="LineNr"> 278 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L279" class="LineNr"> 279 </span> +<span id="L280" class="LineNr"> 280 </span><span class="subxComment"># 1fe:</span> +<span id="L281" class="LineNr"> 281 </span><span class="subxComment"># final 2 bytes of boot sector</span> +<span id="L282" class="LineNr"> 282 </span>55 aa +<span id="L283" class="LineNr"> 283 </span> +<span id="L284" class="LineNr"> 284 </span><span class="subxComment">## sector 2 onwards loaded by load_disk, not automatically on boot</span> +<span id="L285" class="LineNr"> 285 </span> +<span id="L286" class="LineNr"> 286 </span><span class="subxComment"># offset 200 (address 0x7e00):</span> +<span id="L287" class="LineNr"> 287 </span><span class="subxComment"># null interrupt handler:</span> +<span id="L288" class="LineNr"> 288 </span> cf <span class="subxComment"># iret</span> +<span id="L289" class="LineNr"> 289 </span> +<span id="L290" class="LineNr"> 290 </span><span class="subxComment"># padding</span> +<span id="L291" class="LineNr"> 291 </span><span class="subxComment"># 201:</span> +<span id="L292" class="LineNr"> 292 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L293" class="LineNr"> 293 </span> +<span id="L294" class="LineNr"> 294 </span><span class="subxComment"># 210:</span> +<span id="L295" class="LineNr"> 295 </span><span class="subxComment"># keyboard interrupt handler:</span> +<span id="L296" class="LineNr"> 296 </span> <span class="subxComment"># prologue</span> +<span id="L297" class="LineNr"> 297 </span> fa <span class="subxComment"># disable interrupts</span> +<span id="L298" class="LineNr"> 298 </span> 60 <span class="subxComment"># push all registers to stack</span> +<span id="L299" class="LineNr"> 299 </span> <span class="subxComment"># acknowledge interrupt</span> +<span id="L300" class="LineNr"> 300 </span> b0 20 <span class="subxComment"># al <- 0x20</span> +<span id="L301" class="LineNr"> 301 </span> e6 20 <span class="subxComment"># port 0x20 <- al</span> +<span id="L302" class="LineNr"> 302 </span> <span class="subxComment"># read status into eax</span> +<span id="L303" class="LineNr"> 303 </span> 31 c0 <span class="subxComment"># eax <- xor eax; 11/direct 000/r32/eax 000/rm32/eax</span> +<span id="L304" class="LineNr"> 304 </span> e4 64 <span class="subxComment"># al <- port 0x64</span> +<span id="L305" class="LineNr"> 305 </span> <span class="subxComment"># if (status & 0x1) == 0, return</span> +<span id="L306" class="LineNr"> 306 </span> 24 01 <span class="subxComment"># al <- and 0x1</span> +<span id="L307" class="LineNr"> 307 </span> 3c 00 <span class="subxComment"># compare al, 0</span> +<span id="L308" class="LineNr"> 308 </span> 74 89 <span class="subxComment"># jump to epilogue if = [label]</span> +<span id="L309" class="LineNr"> 309 </span><span class="subxComment"># 220:</span> +<span id="L310" class="LineNr"> 310 </span> <span class="subxH1Comment"># - if keyboard buffer is full, return</span> +<span id="L311" class="LineNr"> 311 </span> 31 c9 <span class="subxComment"># ecx <- xor ecx; 11/direct 001/r32/ecx 001/rm32/ecx</span> +<span id="L312" class="LineNr"> 312 </span> <span class="subxComment"># var index/ecx: byte</span> +<span id="L313" class="LineNr"> 313 </span> 8a <span class="subxComment"># copy m8 at r32 to r8</span> +<span id="L314" class="LineNr"> 314 </span> 0d <span class="subxComment"># 00/mod/indirect 001/r8/cl 101/rm32/use-disp32</span> +<span id="L315" class="LineNr"> 315 </span> 28 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L316" class="LineNr"> 316 </span> <span class="subxComment"># al = *(keyboard buffer + index)</span> +<span id="L317" class="LineNr"> 317 </span> 8a <span class="subxComment"># copy m8 at r32 to r8</span> +<span id="L318" class="LineNr"> 318 </span> 81 <span class="subxComment"># 10/mod/*+disp32 000/r8/al 001/rm32/ecx</span> +<span id="L319" class="LineNr"> 319 </span> 30 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L320" class="LineNr"> 320 </span> <span class="subxComment"># if (al != 0) return</span> +<span id="L321" class="LineNr"> 321 </span> 3c 00 <span class="subxComment"># compare al, 0</span> +<span id="L322" class="LineNr"> 322 </span><span class="subxComment"># 230:</span> +<span id="L323" class="LineNr"> 323 </span> 75 77 <span class="subxComment"># jump to epilogue if != [label]</span> +<span id="L324" class="LineNr"> 324 </span> <span class="subxH1Comment"># - read keycode</span> +<span id="L325" class="LineNr"> 325 </span> e4 60 <span class="subxComment"># al <- port 0x60</span> +<span id="L326" class="LineNr"> 326 </span><span class="subxComment"># 234:</span> +<span id="L327" class="LineNr"> 327 </span> <span class="subxH1Comment"># - key released</span> +<span id="L328" class="LineNr"> 328 </span> <span class="subxComment"># if (al == 0xaa) shift = false # left shift is being lifted</span> +<span id="L329" class="LineNr"> 329 </span> 3c aa <span class="subxComment"># compare al, 0xaa</span> +<span id="L330" class="LineNr"> 330 </span> 75 0a <span class="subxComment"># jump to $1 if != [label]</span> +<span id="L331" class="LineNr"> 331 </span><span class="subxComment"># 238:</span> +<span id="L332" class="LineNr"> 332 </span> <span class="subxComment"># *shift = 0</span> +<span id="L333" class="LineNr"> 333 </span> c7 <span class="subxComment"># copy imm32 to rm32</span> +<span id="L334" class="LineNr"> 334 </span> 05 <span class="subxComment"># 00/mod/indirect 000/subop/copy 101/rm32/use-disp32</span> +<span id="L335" class="LineNr"> 335 </span> 10 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L336" class="LineNr"> 336 </span> 00 00 00 00 <span class="subxComment"># imm32</span> +<span id="L337" class="LineNr"> 337 </span><span class="subxComment"># 242:</span> +<span id="L338" class="LineNr"> 338 </span><span class="subxComment"># $1:</span> +<span id="L339" class="LineNr"> 339 </span> <span class="subxComment"># if (al == 0xb6) shift = false # right shift is being lifted</span> +<span id="L340" class="LineNr"> 340 </span> 3c b6 <span class="subxComment"># compare al, 0xb6</span> +<span id="L341" class="LineNr"> 341 </span><span class="subxComment"># 244:</span> +<span id="L342" class="LineNr"> 342 </span> 75 0a <span class="subxComment"># jump to $1 if != [label]</span> +<span id="L343" class="LineNr"> 343 </span> <span class="subxComment"># *shift = 0</span> +<span id="L344" class="LineNr"> 344 </span> c7 <span class="subxComment"># copy imm32 to rm32</span> +<span id="L345" class="LineNr"> 345 </span> 05 <span class="subxComment"># 00/mod/indirect 000/subop/copy 101/rm32/use-disp32</span> +<span id="L346" class="LineNr"> 346 </span> 10 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L347" class="LineNr"> 347 </span> 00 00 00 00 <span class="subxComment"># imm32</span> +<span id="L348" class="LineNr"> 348 </span><span class="subxComment"># 250:</span> +<span id="L349" class="LineNr"> 349 </span><span class="subxComment"># $2:</span> +<span id="L350" class="LineNr"> 350 </span> <span class="subxComment"># if (al & 0x80) a key is being lifted; return</span> +<span id="L351" class="LineNr"> 351 </span> 50 <span class="subxComment"># push eax</span> +<span id="L352" class="LineNr"> 352 </span> 24 80 <span class="subxComment"># al <- and 0x80</span> +<span id="L353" class="LineNr"> 353 </span> 3c 00 <span class="subxComment"># compare al, 0</span> +<span id="L354" class="LineNr"> 354 </span> 58 <span class="subxComment"># pop to eax (without touching flags)</span> +<span id="L355" class="LineNr"> 355 </span> 75 51 <span class="subxComment"># jump to epilogue if != [label]</span> +<span id="L356" class="LineNr"> 356 </span><span class="subxComment"># 258:</span> +<span id="L357" class="LineNr"> 357 </span> <span class="subxH1Comment"># - key pressed</span> +<span id="L358" class="LineNr"> 358 </span> <span class="subxComment"># if (al == 0x2a) shift = true, return # left shift pressed</span> +<span id="L359" class="LineNr"> 359 </span> 3c 2a <span class="subxComment"># compare al, 0x2a</span> +<span id="L360" class="LineNr"> 360 </span> 75 0c <span class="subxComment"># jump to $3 if != [label]</span> +<span id="L361" class="LineNr"> 361 </span> <span class="subxComment"># *shift = 1</span> +<span id="L362" class="LineNr"> 362 </span> c7 <span class="subxComment"># copy imm32 to rm32</span> +<span id="L363" class="LineNr"> 363 </span> 05 <span class="subxComment"># 00/mod/indirect 000/subop/copy 101/rm32/use-disp32</span> +<span id="L364" class="LineNr"> 364 </span> 10 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L365" class="LineNr"> 365 </span> 01 00 00 00 <span class="subxComment"># imm32</span> +<span id="L366" class="LineNr"> 366 </span> eb 41 <span class="subxComment"># jump to epilogue [label]</span> +<span id="L367" class="LineNr"> 367 </span><span class="subxComment"># 268:</span> +<span id="L368" class="LineNr"> 368 </span><span class="subxComment"># $3:</span> +<span id="L369" class="LineNr"> 369 </span> <span class="subxComment"># if (al == 0x36) shift = true, return # right shift pressed</span> +<span id="L370" class="LineNr"> 370 </span> 3c 36 <span class="subxComment"># compare al, 0x36</span> +<span id="L371" class="LineNr"> 371 </span> 75 0c <span class="subxComment"># jump to $4 if != [label]</span> +<span id="L372" class="LineNr"> 372 </span> <span class="subxComment"># *shift = 1</span> +<span id="L373" class="LineNr"> 373 </span> c7 <span class="subxComment"># copy imm32 to rm32</span> +<span id="L374" class="LineNr"> 374 </span> 05 <span class="subxComment"># 00/mod/indirect 000/subop/copy 101/rm32/use-disp32</span> +<span id="L375" class="LineNr"> 375 </span> 10 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L376" class="LineNr"> 376 </span> 01 00 00 00 <span class="subxComment"># imm32</span> +<span id="L377" class="LineNr"> 377 </span> eb 31 <span class="subxComment"># jump to epilogue [label]</span> +<span id="L378" class="LineNr"> 378 </span><span class="subxComment"># $4:</span> +<span id="L379" class="LineNr"> 379 </span><span class="subxComment"># 278:</span> +<span id="L380" class="LineNr"> 380 </span> <span class="subxH1Comment"># - convert key to character</span> +<span id="L381" class="LineNr"> 381 </span> <span class="subxComment"># if (shift) use keyboard normal map</span> +<span id="L382" class="LineNr"> 382 </span> 81 <span class="subxComment"># operate on rm32 and imm32</span> +<span id="L383" class="LineNr"> 383 </span> 3d <span class="subxComment"># 00/mod/indirect 111/subop/compare 101/rm32/use-disp32</span> +<span id="L384" class="LineNr"> 384 </span> 10 80 00 00 <span class="subxComment"># disp32 = shift [label]</span> +<span id="L385" class="LineNr"> 385 </span> 00 00 00 00 <span class="subxComment"># imm32</span> +<span id="L386" class="LineNr"> 386 </span> 74 08 <span class="subxComment"># jump to $5 if = [label]</span> +<span id="L387" class="LineNr"> 387 </span><span class="subxComment"># 284:</span> +<span id="L388" class="LineNr"> 388 </span> <span class="subxComment"># otherwise use keyboard shift map</span> +<span id="L389" class="LineNr"> 389 </span> <span class="subxComment"># al <- *(keyboard shift map + eax)</span> +<span id="L390" class="LineNr"> 390 </span> 8a <span class="subxComment"># copy m8 at rm32 to r8</span> +<span id="L391" class="LineNr"> 391 </span> 80 <span class="subxComment"># 10/mod/*+disp32 000/r8/al 000/rm32/eax</span> +<span id="L392" class="LineNr"> 392 </span> 00 87 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L393" class="LineNr"> 393 </span> eb 06 <span class="subxComment"># jump to $6 [label]</span> +<span id="L394" class="LineNr"> 394 </span><span class="subxComment"># $5:</span> +<span id="L395" class="LineNr"> 395 </span><span class="subxComment"># 28c:</span> +<span id="L396" class="LineNr"> 396 </span> <span class="subxComment"># al <- *(keyboard normal map + eax)</span> +<span id="L397" class="LineNr"> 397 </span> 8a <span class="subxComment"># copy m8 at rm32 to r8</span> +<span id="L398" class="LineNr"> 398 </span> 80 <span class="subxComment"># 10/mod/*+disp32 000/r8/al 000/rm32/eax</span> +<span id="L399" class="LineNr"> 399 </span> 00 86 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L400" class="LineNr"> 400 </span><span class="subxComment"># $6:</span> +<span id="L401" class="LineNr"> 401 </span><span class="subxComment"># 292:</span> +<span id="L402" class="LineNr"> 402 </span> <span class="subxH1Comment"># - if there's no character mapping, return</span> +<span id="L403" class="LineNr"> 403 </span> 3c 00 <span class="subxComment"># compare al, 0</span> +<span id="L404" class="LineNr"> 404 </span> 74 13 <span class="subxComment"># jump to epilogue if = [label]</span> +<span id="L405" class="LineNr"> 405 </span><span class="subxComment"># 296:</span> +<span id="L406" class="LineNr"> 406 </span> <span class="subxH1Comment"># - store al in keyboard buffer</span> +<span id="L407" class="LineNr"> 407 </span> 88 <span class="subxComment"># copy r8 to m8 at r32</span> +<span id="L408" class="LineNr"> 408 </span> 81 <span class="subxComment"># 10/mod/*+disp32 000/r8/al 001/rm32/ecx</span> +<span id="L409" class="LineNr"> 409 </span> 30 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L410" class="LineNr"> 410 </span><span class="subxComment"># 29c:</span> +<span id="L411" class="LineNr"> 411 </span> <span class="subxComment"># increment index</span> +<span id="L412" class="LineNr"> 412 </span> fe <span class="subxComment"># increment byte</span> +<span id="L413" class="LineNr"> 413 </span> 05 <span class="subxComment"># 00/mod/indirect 000/subop/increment 101/rm32/use-disp32</span> +<span id="L414" class="LineNr"> 414 </span> 28 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L415" class="LineNr"> 415 </span><span class="subxComment"># 2a2:</span> +<span id="L416" class="LineNr"> 416 </span> <span class="subxComment"># clear top nibble of index (keyboard buffer is circular)</span> +<span id="L417" class="LineNr"> 417 </span> 80 <span class="subxComment"># and byte</span> +<span id="L418" class="LineNr"> 418 </span> 25 <span class="subxComment"># 00/mod/indirect 100/subop/and 101/rm32/use-disp32</span> +<span id="L419" class="LineNr"> 419 </span> 28 80 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L420" class="LineNr"> 420 </span> 0f <span class="subxComment"># imm8</span> +<span id="L421" class="LineNr"> 421 </span><span class="subxComment"># 2a9:</span> +<span id="L422" class="LineNr"> 422 </span> <span class="subxComment"># epilogue</span> +<span id="L423" class="LineNr"> 423 </span> 61 <span class="subxComment"># pop all registers</span> +<span id="L424" class="LineNr"> 424 </span> fb <span class="subxComment"># enable interrupts</span> +<span id="L425" class="LineNr"> 425 </span> cf <span class="subxComment"># iret</span> +<span id="L426" class="LineNr"> 426 </span> +<span id="L427" class="LineNr"> 427 </span><span class="subxComment"># padding</span> +<span id="L428" class="LineNr"> 428 </span><span class="subxComment"># 2ac:</span> +<span id="L429" class="LineNr"> 429 </span> 00 00 00 00 +<span id="L430" class="LineNr"> 430 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L431" class="LineNr"> 431 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L432" class="LineNr"> 432 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L433" class="LineNr"> 433 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L434" class="LineNr"> 434 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L435" class="LineNr"> 435 </span><span class="subxComment"># 300:</span> +<span id="L436" class="LineNr"> 436 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L437" class="LineNr"> 437 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L438" class="LineNr"> 438 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L439" class="LineNr"> 439 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L440" class="LineNr"> 440 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L441" class="LineNr"> 441 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L442" class="LineNr"> 442 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L443" class="LineNr"> 443 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L444" class="LineNr"> 444 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L445" class="LineNr"> 445 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L446" class="LineNr"> 446 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L447" class="LineNr"> 447 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L448" class="LineNr"> 448 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L449" class="LineNr"> 449 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L450" class="LineNr"> 450 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L451" class="LineNr"> 451 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L452" class="LineNr"> 452 </span> +<span id="L453" class="LineNr"> 453 </span><span class="subxComment"># offset 400 (address 0x8000): interrupt handler data</span> +<span id="L454" class="LineNr"> 454 </span><span class="subxComment"># idt_descriptor:</span> +<span id="L455" class="LineNr"> 455 </span> ff 03 <span class="subxComment"># idt_end - idt_start - 1</span> +<span id="L456" class="LineNr"> 456 </span> 00 82 00 00 <span class="subxComment"># start = idt_start [label]</span> +<span id="L457" class="LineNr"> 457 </span> +<span id="L458" class="LineNr"> 458 </span><span class="subxComment"># padding</span> +<span id="L459" class="LineNr"> 459 </span><span class="subxComment"># 406:</span> +<span id="L460" class="LineNr"> 460 </span> 00 00 00 00 00 00 00 00 00 00 +<span id="L461" class="LineNr"> 461 </span> +<span id="L462" class="LineNr"> 462 </span><span class="subxComment"># 410:</span> +<span id="L463" class="LineNr"> 463 </span><span class="subxComment"># var shift: boolean</span> +<span id="L464" class="LineNr"> 464 </span> 00 00 00 00 +<span id="L465" class="LineNr"> 465 </span> +<span id="L466" class="LineNr"> 466 </span><span class="subxComment"># padding</span> +<span id="L467" class="LineNr"> 467 </span><span class="subxComment"># 414:</span> +<span id="L468" class="LineNr"> 468 </span> 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L469" class="LineNr"> 469 </span>00 00 00 00 00 00 00 00 +<span id="L470" class="LineNr"> 470 </span> +<span id="L471" class="LineNr"> 471 </span><span class="subxComment"># 428:</span> +<span id="L472" class="LineNr"> 472 </span><span class="subxComment"># var keyboard circular buffer</span> +<span id="L473" class="LineNr"> 473 </span><span class="subxComment"># write index: nibble</span> +<span id="L474" class="LineNr"> 474 </span><span class="subxComment"># still take up 4 bytes so SubX can handle it</span> +<span id="L475" class="LineNr"> 475 </span> 00 00 00 00 +<span id="L476" class="LineNr"> 476 </span><span class="subxComment"># 42c:</span> +<span id="L477" class="LineNr"> 477 </span><span class="subxComment"># read index: nibble</span> +<span id="L478" class="LineNr"> 478 </span><span class="subxComment"># still take up 4 bytes so SubX can handle it</span> +<span id="L479" class="LineNr"> 479 </span> 00 00 00 00 +<span id="L480" class="LineNr"> 480 </span><span class="subxComment"># 430:</span> +<span id="L481" class="LineNr"> 481 </span><span class="subxComment"># circular buffer: byte[16]</span> +<span id="L482" class="LineNr"> 482 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L483" class="LineNr"> 483 </span> +<span id="L484" class="LineNr"> 484 </span><span class="subxComment"># padding</span> +<span id="L485" class="LineNr"> 485 </span><span class="subxComment"># 440:</span> +<span id="L486" class="LineNr"> 486 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L487" class="LineNr"> 487 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L488" class="LineNr"> 488 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L489" class="LineNr"> 489 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L490" class="LineNr"> 490 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L491" class="LineNr"> 491 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L492" class="LineNr"> 492 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L493" class="LineNr"> 493 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L494" class="LineNr"> 494 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L495" class="LineNr"> 495 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L496" class="LineNr"> 496 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L497" class="LineNr"> 497 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +<span id="L498" class="LineNr"> 498 </span> +<span id="L499" class="LineNr"> 499 </span><span class="subxComment"># offset 500 (address 0x8100):</span> +<span id="L500" class="Folded"> 500 </span><span class="Folded">+-- 53 lines: # video mode info ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</span> +<span id="L553" class="LineNr"> 553 </span> +<span id="L554" class="LineNr"> 554 </span><span class="subxComment"># offset 600 (address 0x8200):</span> +<span id="L555" class="Folded"> 555 </span><span class="Folded">+--161 lines: # interrupt descriptor table -------------------------------------------------------------------------------------------------------------------------------------------------------------------------</span> +<span id="L716" class="LineNr"> 716 </span> +<span id="L717" class="LineNr"> 717 </span><span class="subxComment">## the rest of this file has data</span> +<span id="L718" class="LineNr"> 718 </span> +<span id="L719" class="LineNr"> 719 </span><span class="subxComment"># offset a00 (address 0x8600):</span> +<span id="L720" class="Folded"> 720 </span><span class="Folded">+--152 lines: # translating keys to ASCII --------------------------------------------------------------------------------------------------------------------------------------------------------------------------</span> +<span id="L872" class="LineNr"> 872 </span> +<span id="L873" class="LineNr"> 873 </span><span class="subxComment"># offset 1000 (address 0x8c00)</span> +<span id="L874" class="Folded"> 874 </span><span class="Folded">+--236 lines: # Bitmaps for some ASCII characters (soon Unicode) ---------------------------------------------------------------------------------------------------------------------------------------------------</span> +<span id="L1110" class="LineNr">1110 </span> +<span id="L1111" class="LineNr">1111 </span><span class="subxComment"># offset 1800 (address 0x9400)</span> +<span id="L1112" class="LineNr">1112 </span> +<span id="L1113" class="LineNr">1113 </span><span class="subxComment"># vim:ft=subx</span> </pre> </body> </html> diff --git a/html/baremetal/ex1.hex.html b/html/baremetal/ex1.hex.html index 3adbfdb7..ae0b69d0 100644 --- a/html/baremetal/ex1.hex.html +++ b/html/baremetal/ex1.hex.html @@ -66,7 +66,7 @@ if ('onhashchange' in window) { <span id="L13" class="LineNr">13 </span><span class="subxComment"># Or:</span> <span id="L14" class="LineNr">14 </span><span class="subxComment"># bochs -f baremetal/boot.bochsrc # boot.bochsrc loads disk.img</span> <span id="L15" class="LineNr">15 </span> -<span id="L16" class="LineNr">16 </span><span class="subxComment"># main: (address 0x9000)</span> +<span id="L16" class="LineNr">16 </span><span class="subxComment"># main: (address 0x9400)</span> <span id="L17" class="LineNr">17 </span>e9 fb ff ff ff <span class="subxComment"># jump to main, hanging indefinitely</span> <span id="L18" class="LineNr">18 </span> <span id="L19" class="LineNr">19 </span><span class="subxComment"># vim:ft=subx</span> diff --git a/html/baremetal/ex2.hex.html b/html/baremetal/ex2.hex.html index b5c89498..0af30d73 100644 --- a/html/baremetal/ex2.hex.html +++ b/html/baremetal/ex2.hex.html @@ -66,12 +66,12 @@ if ('onhashchange' in window) { <span id="L13" class="LineNr">13 </span><span class="subxComment"># Expected output:</span> <span id="L14" class="LineNr">14 </span><span class="subxComment"># html/baremetal.png</span> <span id="L15" class="LineNr">15 </span> -<span id="L16" class="LineNr">16 </span><span class="subxComment"># main: (address 0x9000)</span> +<span id="L16" class="LineNr">16 </span><span class="subxComment"># main: (address 0x9400)</span> <span id="L17" class="LineNr">17 </span> <span id="L18" class="LineNr">18 </span><span class="subxComment"># ecx <- LFB</span> <span id="L19" class="LineNr">19 </span>8b <span class="subxComment"># copy *rm32 to r32</span> <span id="L20" class="LineNr">20 </span> 0d <span class="subxComment"># 00/mod/indirect 001/r32/ecx 101/rm32/use-disp32</span> -<span id="L21" class="LineNr">21 </span> 28 7f 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L21" class="LineNr">21 </span> 28 81 00 00 <span class="subxComment"># disp32 [label]</span> <span id="L22" class="LineNr">22 </span> <span id="L23" class="LineNr">23 </span><span class="subxComment"># eax <- LFB + 0xbffff (1024*768 - 1)</span> <span id="L24" class="LineNr">24 </span>8d <span class="subxComment"># copy-address rm32 to r32</span> diff --git a/html/baremetal/ex2.subx.html b/html/baremetal/ex2.subx.html index 9064d31b..9b1f46e6 100644 --- a/html/baremetal/ex2.subx.html +++ b/html/baremetal/ex2.subx.html @@ -69,7 +69,7 @@ if ('onhashchange' in window) { <span id="L14" class="LineNr">14 </span> <span id="L15" class="LineNr">15 </span><span class="subxFunction">main</span>: <span id="L16" class="LineNr">16 </span> <span class="subxComment"># ecx <- start of video memory</span> -<span id="L17" class="LineNr">17 </span> 8b/-> *0x7f28 1/r32/ecx +<span id="L17" class="LineNr">17 </span> 8b/-> *0x8128 1/r32/ecx <span id="L18" class="LineNr">18 </span> <span id="L19" class="LineNr">19 </span> <span class="subxComment"># eax <- final pixel of video memory</span> <span id="L20" class="LineNr">20 </span> 8d/copy-address *(ecx + 0x0bffff) 0/r32/eax <span class="subxComment"># 0xbffff = 1024*768 - 1</span> diff --git a/html/baremetal/ex3.hex.html b/html/baremetal/ex3.hex.html index 08708bd7..013dd705 100644 --- a/html/baremetal/ex3.hex.html +++ b/html/baremetal/ex3.hex.html @@ -69,7 +69,7 @@ if ('onhashchange' in window) { <span id="L16" class="LineNr">16 </span><span class="subxComment"># eax <- LFB</span> <span id="L17" class="LineNr">17 </span>8b <span class="subxComment"># copy *rm32 to r32</span> <span id="L18" class="LineNr">18 </span> 05 <span class="subxComment"># 00/mod/indirect 000/r32/eax 101/rm32/use-disp32</span> -<span id="L19" class="LineNr">19 </span> 28 7f 00 00 <span class="subxComment"># disp32 [label]</span> +<span id="L19" class="LineNr">19 </span> 28 81 00 00 <span class="subxComment"># disp32 [label]</span> <span id="L20" class="LineNr">20 </span> <span id="L21" class="LineNr">21 </span><span class="subxComment"># var read index/ecx: byte = 0</span> <span id="L22" class="LineNr">22 </span>31 c9 <span class="subxComment"># ecx <- xor ecx; 11/direct 001/r32/ecx 001/rm32/ecx</span> diff --git a/html/baremetal/rpn.mu.html b/html/baremetal/rpn.mu.html index b613716b..1ce25cca 100644 --- a/html/baremetal/rpn.mu.html +++ b/html/baremetal/rpn.mu.html @@ -59,157 +59,156 @@ if ('onhashchange' in window) { <span id="L1" class="LineNr"> 1 </span><span class="muComment"># Integer arithmetic using postfix notation</span> <span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span> <span id="L3" class="LineNr"> 3 </span><span class="muComment"># Limitations:</span> -<span id="L4" class="LineNr"> 4 </span><span class="muComment"># '+' and '*' temporarily not available until the keyboard driver supports the shift key</span> -<span id="L5" class="LineNr"> 5 </span><span class="muComment"># Division not implemented yet.</span> -<span id="L6" class="LineNr"> 6 </span><span class="muComment">#</span> -<span id="L7" class="LineNr"> 7 </span><span class="muComment"># To build:</span> -<span id="L8" class="LineNr"> 8 </span><span class="muComment"># $ ./translate_mu_baremetal baremetal/rpn.mu</span> -<span id="L9" class="LineNr"> 9 </span><span class="muComment">#</span> -<span id="L10" class="LineNr"> 10 </span><span class="muComment"># Example session:</span> -<span id="L11" class="LineNr"> 11 </span><span class="muComment"># $ qemu-system-i386 disk.img</span> -<span id="L12" class="LineNr"> 12 </span><span class="muComment"># > 4</span> -<span id="L13" class="LineNr"> 13 </span><span class="muComment"># 4</span> -<span id="L14" class="LineNr"> 14 </span><span class="muComment"># > 5 3 -</span> -<span id="L15" class="LineNr"> 15 </span><span class="muComment"># 2</span> -<span id="L16" class="LineNr"> 16 </span><span class="muComment">#</span> -<span id="L17" class="LineNr"> 17 </span><span class="muComment"># Error handling is non-existent. This is just a prototype.</span> -<span id="L18" class="LineNr"> 18 </span> -<span id="L19" class="LineNr"> 19 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L19'>main</a></span><span class="PreProc"> -> </span>_/<span class="Constant">ebx</span>: int <span class="Delimiter">{</span> -<span id="L20" class="LineNr"> 20 </span> <span class="PreProc">var</span> in-storage: (stream byte <span class="Constant">0x80</span>) -<span id="L21" class="LineNr"> 21 </span> <span class="PreProc">var</span> in/<span class="Constant">esi</span>: (addr stream byte) <span class="SpecialChar"><-</span> address in-storage -<span id="L22" class="LineNr"> 22 </span> <span class="PreProc">var</span> y/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span> -<span id="L23" class="LineNr"> 23 </span> <span class="PreProc">var</span> space/<span class="Constant">edx</span>: grapheme <span class="SpecialChar"><-</span> copy <span class="Constant">0x20</span> -<span id="L24" class="LineNr"> 24 </span> <span class="muComment"># read-eval-print loop</span> -<span id="L25" class="LineNr"> 25 </span> <span class="Delimiter">{</span> -<span id="L26" class="LineNr"> 26 </span> <span class="muComment"># print prompt</span> -<span id="L27" class="LineNr"> 27 </span> <span class="PreProc">var</span> x/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='501draw-text.mu.html#L73'>draw-text-rightward</a> <span class="Constant">0</span>, <span class="Constant">"> "</span>, <span class="Constant">0</span>, <span class="Constant">0x80</span>, y, <span class="Constant">3</span> -<span id="L28" class="LineNr"> 28 </span> <a href='500text-screen.mu.html#L115'>set-cursor-position</a> <span class="Constant">0</span>, x, y -<span id="L29" class="LineNr"> 29 </span> <span class="muComment"># read line from keyboard</span> -<span id="L30" class="LineNr"> 30 </span> <a href='106stream.subx.html#L20'>clear-stream</a> in -<span id="L31" class="LineNr"> 31 </span> <span class="Delimiter">{</span> -<span id="L32" class="LineNr"> 32 </span> <a href='500text-screen.mu.html#L162'>show-cursor</a> <span class="Constant">0</span>, space -<span id="L33" class="LineNr"> 33 </span> <span class="PreProc">var</span> key/<span class="Constant">eax</span>: byte <span class="SpecialChar"><-</span> <a href='102keyboard.subx.html#L9'>read-key</a> <span class="Constant">0</span> -<span id="L34" class="LineNr"> 34 </span> compare key, <span class="Constant">0xa</span> <span class="muComment"># newline</span> -<span id="L35" class="LineNr"> 35 </span> <span class="PreProc">break-if-=</span> -<span id="L36" class="LineNr"> 36 </span> compare key, <span class="Constant">0</span> -<span id="L37" class="LineNr"> 37 </span> <span class="PreProc">loop-if-=</span> -<span id="L38" class="LineNr"> 38 </span> <span class="PreProc">var</span> key2/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy key -<span id="L39" class="LineNr"> 39 </span> <a href='115write-byte.subx.html#L12'>append-byte</a> in, key2 -<span id="L40" class="LineNr"> 40 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> copy key2 -<span id="L41" class="LineNr"> 41 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, g, <span class="Constant">0xf</span> -<span id="L42" class="LineNr"> 42 </span> <a href='501draw-text.mu.html#L16'>cursor-right</a> <span class="Constant">0</span> -<span id="L43" class="LineNr"> 43 </span> <span class="PreProc">loop</span> -<span id="L44" class="LineNr"> 44 </span> <span class="Delimiter">}</span> -<span id="L45" class="LineNr"> 45 </span> <span class="muComment"># clear cursor</span> -<span id="L46" class="LineNr"> 46 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, space, <span class="Constant">3</span> <span class="muComment"># 3=foreground color, which is never used</span> -<span id="L47" class="LineNr"> 47 </span> <span class="muComment"># parse and eval</span> -<span id="L48" class="LineNr"> 48 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L65'>simplify</a> in -<span id="L49" class="LineNr"> 49 </span> <span class="muComment"># print</span> -<span id="L50" class="LineNr"> 50 </span> y <span class="SpecialChar"><-</span> increment -<span id="L51" class="LineNr"> 51 </span> out, y <span class="SpecialChar"><-</span> <a href='501draw-text.mu.html#L292'>draw-int32-decimal-wrapping-right-then-down</a> <span class="Constant">0</span>, out, <span class="Constant">0</span>, y, <span class="Constant">0x80</span>, <span class="Constant">0x30</span>, <span class="Constant">0</span>, y, <span class="Constant">7</span> -<span id="L52" class="LineNr"> 52 </span> <span class="muComment"># newline</span> -<span id="L53" class="LineNr"> 53 </span> y <span class="SpecialChar"><-</span> increment -<span id="L54" class="LineNr"> 54 </span> <span class="muComment">#</span> -<span id="L55" class="LineNr"> 55 </span> <span class="PreProc">loop</span> -<span id="L56" class="LineNr"> 56 </span> <span class="Delimiter">}</span> -<span id="L57" class="LineNr"> 57 </span> <span class="PreProc">return</span> <span class="Constant">0</span> -<span id="L58" class="LineNr"> 58 </span><span class="Delimiter">}</span> -<span id="L59" class="LineNr"> 59 </span> -<span id="L60" class="LineNr"> 60 </span><span class="PreProc">type</span> <a href='rpn.mu.html#L60'>int-stack</a> <span class="Delimiter">{</span> -<span id="L61" class="LineNr"> 61 </span> data: (handle array int) -<span id="L62" class="LineNr"> 62 </span> top: int -<span id="L63" class="LineNr"> 63 </span><span class="Delimiter">}</span> -<span id="L64" class="LineNr"> 64 </span> -<span id="L65" class="LineNr"> 65 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L65'>simplify</a></span> in: (addr stream byte)<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span> -<span id="L66" class="LineNr"> 66 </span> <span class="PreProc">var</span> word-storage: slice -<span id="L67" class="LineNr"> 67 </span> <span class="PreProc">var</span> word/<span class="Constant">ecx</span>: (addr slice) <span class="SpecialChar"><-</span> address word-storage -<span id="L68" class="LineNr"> 68 </span> <span class="PreProc">var</span> stack-storage: <a href='rpn.mu.html#L60'>int-stack</a> -<span id="L69" class="LineNr"> 69 </span> <span class="PreProc">var</span> stack/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L60'>int-stack</a>) <span class="SpecialChar"><-</span> address stack-storage -<span id="L70" class="LineNr"> 70 </span> <a href='rpn.mu.html#L119'>initialize-int-stack</a> stack, <span class="Constant">0x10</span> -<span id="L71" class="LineNr"> 71 </span> $simplify:word-loop: <span class="Delimiter">{</span> -<span id="L72" class="LineNr"> 72 </span> <a href='127next-word.subx.html#L11'>next-word</a> in, word -<span id="L73" class="LineNr"> 73 </span> <span class="PreProc">var</span> done?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L9'>slice-empty?</a> word -<span id="L74" class="LineNr"> 74 </span> compare done?, <span class="Constant">0</span> -<span id="L75" class="LineNr"> 75 </span> <span class="PreProc">break-if-!=</span> -<span id="L76" class="LineNr"> 76 </span> <span class="muComment"># if word is an operator, perform it</span> -<span id="L77" class="LineNr"> 77 </span> <span class="Delimiter">{</span> -<span id="L78" class="LineNr"> 78 </span> <span class="PreProc">var</span> is-add?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"+"</span> -<span id="L79" class="LineNr"> 79 </span> compare is-add?, <span class="Constant">0</span> -<span id="L80" class="LineNr"> 80 </span> <span class="PreProc">break-if-=</span> -<span id="L81" class="LineNr"> 81 </span> <span class="PreProc">var</span> _b/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L139'>pop-int-stack</a> stack -<span id="L82" class="LineNr"> 82 </span> <span class="PreProc">var</span> b/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy _b -<span id="L83" class="LineNr"> 83 </span> <span class="PreProc">var</span> a/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L139'>pop-int-stack</a> stack -<span id="L84" class="LineNr"> 84 </span> a <span class="SpecialChar"><-</span> add b -<span id="L85" class="LineNr"> 85 </span> <a href='rpn.mu.html#L127'>push-int-stack</a> stack, a -<span id="L86" class="LineNr"> 86 </span> <span class="PreProc">loop</span> $simplify:word-loop -<span id="L87" class="LineNr"> 87 </span> <span class="Delimiter">}</span> -<span id="L88" class="LineNr"> 88 </span> <span class="Delimiter">{</span> -<span id="L89" class="LineNr"> 89 </span> <span class="PreProc">var</span> is-sub?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"-"</span> -<span id="L90" class="LineNr"> 90 </span> compare is-sub?, <span class="Constant">0</span> -<span id="L91" class="LineNr"> 91 </span> <span class="PreProc">break-if-=</span> -<span id="L92" class="LineNr"> 92 </span> <span class="PreProc">var</span> _b/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L139'>pop-int-stack</a> stack -<span id="L93" class="LineNr"> 93 </span> <span class="PreProc">var</span> b/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy _b -<span id="L94" class="LineNr"> 94 </span> <span class="PreProc">var</span> a/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L139'>pop-int-stack</a> stack -<span id="L95" class="LineNr"> 95 </span> a <span class="SpecialChar"><-</span> subtract b -<span id="L96" class="LineNr"> 96 </span> <a href='rpn.mu.html#L127'>push-int-stack</a> stack, a -<span id="L97" class="LineNr"> 97 </span> <span class="PreProc">loop</span> $simplify:word-loop -<span id="L98" class="LineNr"> 98 </span> <span class="Delimiter">}</span> -<span id="L99" class="LineNr"> 99 </span> <span class="Delimiter">{</span> -<span id="L100" class="LineNr">100 </span> <span class="PreProc">var</span> is-mul?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"*"</span> -<span id="L101" class="LineNr">101 </span> compare is-mul?, <span class="Constant">0</span> -<span id="L102" class="LineNr">102 </span> <span class="PreProc">break-if-=</span> -<span id="L103" class="LineNr">103 </span> <span class="PreProc">var</span> _b/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L139'>pop-int-stack</a> stack -<span id="L104" class="LineNr">104 </span> <span class="PreProc">var</span> b/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy _b -<span id="L105" class="LineNr">105 </span> <span class="PreProc">var</span> a/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L139'>pop-int-stack</a> stack -<span id="L106" class="LineNr">106 </span> a <span class="SpecialChar"><-</span> multiply b -<span id="L107" class="LineNr">107 </span> <a href='rpn.mu.html#L127'>push-int-stack</a> stack, a -<span id="L108" class="LineNr">108 </span> <span class="PreProc">loop</span> $simplify:word-loop -<span id="L109" class="LineNr">109 </span> <span class="Delimiter">}</span> -<span id="L110" class="LineNr">110 </span> <span class="muComment"># otherwise it's an int</span> -<span id="L111" class="LineNr">111 </span> <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='311decimal-int.subx.html#L4'>parse-decimal-int-from-slice</a> word -<span id="L112" class="LineNr">112 </span> <a href='rpn.mu.html#L127'>push-int-stack</a> stack, n -<span id="L113" class="LineNr">113 </span> <span class="PreProc">loop</span> -<span id="L114" class="LineNr">114 </span> <span class="Delimiter">}</span> -<span id="L115" class="LineNr">115 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L139'>pop-int-stack</a> stack -<span id="L116" class="LineNr">116 </span> <span class="PreProc">return</span> result -<span id="L117" class="LineNr">117 </span><span class="Delimiter">}</span> -<span id="L118" class="LineNr">118 </span> -<span id="L119" class="LineNr">119 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L119'>initialize-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L60'>int-stack</a>), n: int <span class="Delimiter">{</span> -<span id="L120" class="LineNr">120 </span> <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L60'>int-stack</a>) <span class="SpecialChar"><-</span> copy _self -<span id="L121" class="LineNr">121 </span> <span class="PreProc">var</span> d/<span class="Constant">edi</span>: (addr handle array int) <span class="SpecialChar"><-</span> get self, data -<span id="L122" class="LineNr">122 </span> populate d, n -<span id="L123" class="LineNr">123 </span> <span class="PreProc">var</span> top/<span class="Constant">eax</span>: (addr int) <span class="SpecialChar"><-</span> get self, top -<span id="L124" class="LineNr">124 </span> copy-to *top, <span class="Constant">0</span> -<span id="L125" class="LineNr">125 </span><span class="Delimiter">}</span> -<span id="L126" class="LineNr">126 </span> -<span id="L127" class="LineNr">127 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L127'>push-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L60'>int-stack</a>), _val: int <span class="Delimiter">{</span> -<span id="L128" class="LineNr">128 </span> <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L60'>int-stack</a>) <span class="SpecialChar"><-</span> copy _self -<span id="L129" class="LineNr">129 </span> <span class="PreProc">var</span> top-addr/<span class="Constant">ecx</span>: (addr int) <span class="SpecialChar"><-</span> get self, top -<span id="L130" class="LineNr">130 </span> <span class="PreProc">var</span> data-ah/<span class="Constant">edx</span>: (addr handle array int) <span class="SpecialChar"><-</span> get self, data -<span id="L131" class="LineNr">131 </span> <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array int) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah -<span id="L132" class="LineNr">132 </span> <span class="PreProc">var</span> top/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy *top-addr -<span id="L133" class="LineNr">133 </span> <span class="PreProc">var</span> dest-addr/<span class="Constant">edx</span>: (addr int) <span class="SpecialChar"><-</span> index data, top -<span id="L134" class="LineNr">134 </span> <span class="PreProc">var</span> val/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy _val -<span id="L135" class="LineNr">135 </span> copy-to *dest-addr, val -<span id="L136" class="LineNr">136 </span> add-to *top-addr, <span class="Constant">1</span> -<span id="L137" class="LineNr">137 </span><span class="Delimiter">}</span> -<span id="L138" class="LineNr">138 </span> -<span id="L139" class="LineNr">139 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L139'>pop-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L60'>int-stack</a>)<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span> -<span id="L140" class="LineNr">140 </span> <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L60'>int-stack</a>) <span class="SpecialChar"><-</span> copy _self -<span id="L141" class="LineNr">141 </span> <span class="PreProc">var</span> top-addr/<span class="Constant">ecx</span>: (addr int) <span class="SpecialChar"><-</span> get self, top -<span id="L142" class="LineNr">142 </span> <span class="Delimiter">{</span> -<span id="L143" class="LineNr">143 </span> compare *top-addr, <span class="Constant">0</span> -<span id="L144" class="LineNr">144 </span> <span class="PreProc">break-if-></span> -<span id="L145" class="LineNr">145 </span> <span class="PreProc">return</span> <span class="Constant">0</span> -<span id="L146" class="LineNr">146 </span> <span class="Delimiter">}</span> -<span id="L147" class="LineNr">147 </span> subtract-from *top-addr, <span class="Constant">1</span> -<span id="L148" class="LineNr">148 </span> <span class="PreProc">var</span> data-ah/<span class="Constant">edx</span>: (addr handle array int) <span class="SpecialChar"><-</span> get self, data -<span id="L149" class="LineNr">149 </span> <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array int) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah -<span id="L150" class="LineNr">150 </span> <span class="PreProc">var</span> top/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy *top-addr -<span id="L151" class="LineNr">151 </span> <span class="PreProc">var</span> result-addr/<span class="Constant">eax</span>: (addr int) <span class="SpecialChar"><-</span> index data, top -<span id="L152" class="LineNr">152 </span> <span class="PreProc">var</span> val/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy *result-addr -<span id="L153" class="LineNr">153 </span> <span class="PreProc">return</span> val -<span id="L154" class="LineNr">154 </span><span class="Delimiter">}</span> +<span id="L4" class="LineNr"> 4 </span><span class="muComment"># Division not implemented yet.</span> +<span id="L5" class="LineNr"> 5 </span><span class="muComment">#</span> +<span id="L6" class="LineNr"> 6 </span><span class="muComment"># To build:</span> +<span id="L7" class="LineNr"> 7 </span><span class="muComment"># $ ./translate_mu_baremetal baremetal/rpn.mu</span> +<span id="L8" class="LineNr"> 8 </span><span class="muComment">#</span> +<span id="L9" class="LineNr"> 9 </span><span class="muComment"># Example session:</span> +<span id="L10" class="LineNr"> 10 </span><span class="muComment"># $ qemu-system-i386 disk.img</span> +<span id="L11" class="LineNr"> 11 </span><span class="muComment"># > 4</span> +<span id="L12" class="LineNr"> 12 </span><span class="muComment"># 4</span> +<span id="L13" class="LineNr"> 13 </span><span class="muComment"># > 5 3 -</span> +<span id="L14" class="LineNr"> 14 </span><span class="muComment"># 2</span> +<span id="L15" class="LineNr"> 15 </span><span class="muComment">#</span> +<span id="L16" class="LineNr"> 16 </span><span class="muComment"># Error handling is non-existent. This is just a prototype.</span> +<span id="L17" class="LineNr"> 17 </span> +<span id="L18" class="LineNr"> 18 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L18'>main</a></span><span class="PreProc"> -> </span>_/<span class="Constant">ebx</span>: int <span class="Delimiter">{</span> +<span id="L19" class="LineNr"> 19 </span> <span class="PreProc">var</span> in-storage: (stream byte <span class="Constant">0x80</span>) +<span id="L20" class="LineNr"> 20 </span> <span class="PreProc">var</span> in/<span class="Constant">esi</span>: (addr stream byte) <span class="SpecialChar"><-</span> address in-storage +<span id="L21" class="LineNr"> 21 </span> <span class="PreProc">var</span> y/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span> +<span id="L22" class="LineNr"> 22 </span> <span class="PreProc">var</span> space/<span class="Constant">edx</span>: grapheme <span class="SpecialChar"><-</span> copy <span class="Constant">0x20</span> +<span id="L23" class="LineNr"> 23 </span> <span class="muComment"># read-eval-print loop</span> +<span id="L24" class="LineNr"> 24 </span> <span class="Delimiter">{</span> +<span id="L25" class="LineNr"> 25 </span> <span class="muComment"># print prompt</span> +<span id="L26" class="LineNr"> 26 </span> <span class="PreProc">var</span> x/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='501draw-text.mu.html#L73'>draw-text-rightward</a> <span class="Constant">0</span>, <span class="Constant">"> "</span>, <span class="Constant">0</span>, <span class="Constant">0x80</span>, y, <span class="Constant">3</span> +<span id="L27" class="LineNr"> 27 </span> <a href='500text-screen.mu.html#L115'>set-cursor-position</a> <span class="Constant">0</span>, x, y +<span id="L28" class="LineNr"> 28 </span> <span class="muComment"># read line from keyboard</span> +<span id="L29" class="LineNr"> 29 </span> <a href='106stream.subx.html#L20'>clear-stream</a> in +<span id="L30" class="LineNr"> 30 </span> <span class="Delimiter">{</span> +<span id="L31" class="LineNr"> 31 </span> <a href='500text-screen.mu.html#L162'>show-cursor</a> <span class="Constant">0</span>, space +<span id="L32" class="LineNr"> 32 </span> <span class="PreProc">var</span> key/<span class="Constant">eax</span>: byte <span class="SpecialChar"><-</span> <a href='102keyboard.subx.html#L9'>read-key</a> <span class="Constant">0</span> +<span id="L33" class="LineNr"> 33 </span> compare key, <span class="Constant">0xa</span> <span class="muComment"># newline</span> +<span id="L34" class="LineNr"> 34 </span> <span class="PreProc">break-if-=</span> +<span id="L35" class="LineNr"> 35 </span> compare key, <span class="Constant">0</span> +<span id="L36" class="LineNr"> 36 </span> <span class="PreProc">loop-if-=</span> +<span id="L37" class="LineNr"> 37 </span> <span class="PreProc">var</span> key2/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy key +<span id="L38" class="LineNr"> 38 </span> <a href='115write-byte.subx.html#L12'>append-byte</a> in, key2 +<span id="L39" class="LineNr"> 39 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> copy key2 +<span id="L40" class="LineNr"> 40 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, g, <span class="Constant">0xf</span> +<span id="L41" class="LineNr"> 41 </span> <a href='501draw-text.mu.html#L16'>cursor-right</a> <span class="Constant">0</span> +<span id="L42" class="LineNr"> 42 </span> <span class="PreProc">loop</span> +<span id="L43" class="LineNr"> 43 </span> <span class="Delimiter">}</span> +<span id="L44" class="LineNr"> 44 </span> <span class="muComment"># clear cursor</span> +<span id="L45" class="LineNr"> 45 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, space, <span class="Constant">3</span> <span class="muComment"># 3=foreground color, which is never used</span> +<span id="L46" class="LineNr"> 46 </span> <span class="muComment"># parse and eval</span> +<span id="L47" class="LineNr"> 47 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L64'>simplify</a> in +<span id="L48" class="LineNr"> 48 </span> <span class="muComment"># print</span> +<span id="L49" class="LineNr"> 49 </span> y <span class="SpecialChar"><-</span> increment +<span id="L50" class="LineNr"> 50 </span> out, y <span class="SpecialChar"><-</span> <a href='501draw-text.mu.html#L292'>draw-int32-decimal-wrapping-right-then-down</a> <span class="Constant">0</span>, out, <span class="Constant">0</span>, y, <span class="Constant">0x80</span>, <span class="Constant">0x30</span>, <span class="Constant">0</span>, y, <span class="Constant">7</span> +<span id="L51" class="LineNr"> 51 </span> <span class="muComment"># newline</span> +<span id="L52" class="LineNr"> 52 </span> y <span class="SpecialChar"><-</span> increment +<span id="L53" class="LineNr"> 53 </span> <span class="muComment">#</span> +<span id="L54" class="LineNr"> 54 </span> <span class="PreProc">loop</span> +<span id="L55" class="LineNr"> 55 </span> <span class="Delimiter">}</span> +<span id="L56" class="LineNr"> 56 </span> <span class="PreProc">return</span> <span class="Constant">0</span> +<span id="L57" class="LineNr"> 57 </span><span class="Delimiter">}</span> +<span id="L58" class="LineNr"> 58 </span> +<span id="L59" class="LineNr"> 59 </span><span class="PreProc">type</span> <a href='rpn.mu.html#L59'>int-stack</a> <span class="Delimiter">{</span> +<span id="L60" class="LineNr"> 60 </span> data: (handle array int) +<span id="L61" class="LineNr"> 61 </span> top: int +<span id="L62" class="LineNr"> 62 </span><span class="Delimiter">}</span> +<span id="L63" class="LineNr"> 63 </span> +<span id="L64" class="LineNr"> 64 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L64'>simplify</a></span> in: (addr stream byte)<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span> +<span id="L65" class="LineNr"> 65 </span> <span class="PreProc">var</span> word-storage: slice +<span id="L66" class="LineNr"> 66 </span> <span class="PreProc">var</span> word/<span class="Constant">ecx</span>: (addr slice) <span class="SpecialChar"><-</span> address word-storage +<span id="L67" class="LineNr"> 67 </span> <span class="PreProc">var</span> stack-storage: <a href='rpn.mu.html#L59'>int-stack</a> +<span id="L68" class="LineNr"> 68 </span> <span class="PreProc">var</span> stack/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L59'>int-stack</a>) <span class="SpecialChar"><-</span> address stack-storage +<span id="L69" class="LineNr"> 69 </span> <a href='rpn.mu.html#L118'>initialize-int-stack</a> stack, <span class="Constant">0x10</span> +<span id="L70" class="LineNr"> 70 </span> $simplify:word-loop: <span class="Delimiter">{</span> +<span id="L71" class="LineNr"> 71 </span> <a href='127next-word.subx.html#L11'>next-word</a> in, word +<span id="L72" class="LineNr"> 72 </span> <span class="PreProc">var</span> done?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L9'>slice-empty?</a> word +<span id="L73" class="LineNr"> 73 </span> compare done?, <span class="Constant">0</span> +<span id="L74" class="LineNr"> 74 </span> <span class="PreProc">break-if-!=</span> +<span id="L75" class="LineNr"> 75 </span> <span class="muComment"># if word is an operator, perform it</span> +<span id="L76" class="LineNr"> 76 </span> <span class="Delimiter">{</span> +<span id="L77" class="LineNr"> 77 </span> <span class="PreProc">var</span> is-add?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"+"</span> +<span id="L78" class="LineNr"> 78 </span> compare is-add?, <span class="Constant">0</span> +<span id="L79" class="LineNr"> 79 </span> <span class="PreProc">break-if-=</span> +<span id="L80" class="LineNr"> 80 </span> <span class="PreProc">var</span> _b/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L138'>pop-int-stack</a> stack +<span id="L81" class="LineNr"> 81 </span> <span class="PreProc">var</span> b/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy _b +<span id="L82" class="LineNr"> 82 </span> <span class="PreProc">var</span> a/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L138'>pop-int-stack</a> stack +<span id="L83" class="LineNr"> 83 </span> a <span class="SpecialChar"><-</span> add b +<span id="L84" class="LineNr"> 84 </span> <a href='rpn.mu.html#L126'>push-int-stack</a> stack, a +<span id="L85" class="LineNr"> 85 </span> <span class="PreProc">loop</span> $simplify:word-loop +<span id="L86" class="LineNr"> 86 </span> <span class="Delimiter">}</span> +<span id="L87" class="LineNr"> 87 </span> <span class="Delimiter">{</span> +<span id="L88" class="LineNr"> 88 </span> <span class="PreProc">var</span> is-sub?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"-"</span> +<span id="L89" class="LineNr"> 89 </span> compare is-sub?, <span class="Constant">0</span> +<span id="L90" class="LineNr"> 90 </span> <span class="PreProc">break-if-=</span> +<span id="L91" class="LineNr"> 91 </span> <span class="PreProc">var</span> _b/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L138'>pop-int-stack</a> stack +<span id="L92" class="LineNr"> 92 </span> <span class="PreProc">var</span> b/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy _b +<span id="L93" class="LineNr"> 93 </span> <span class="PreProc">var</span> a/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L138'>pop-int-stack</a> stack +<span id="L94" class="LineNr"> 94 </span> a <span class="SpecialChar"><-</span> subtract b +<span id="L95" class="LineNr"> 95 </span> <a href='rpn.mu.html#L126'>push-int-stack</a> stack, a +<span id="L96" class="LineNr"> 96 </span> <span class="PreProc">loop</span> $simplify:word-loop +<span id="L97" class="LineNr"> 97 </span> <span class="Delimiter">}</span> +<span id="L98" class="LineNr"> 98 </span> <span class="Delimiter">{</span> +<span id="L99" class="LineNr"> 99 </span> <span class="PreProc">var</span> is-mul?/<span class="Constant">eax</span>: boolean <span class="SpecialChar"><-</span> <a href='123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"*"</span> +<span id="L100" class="LineNr">100 </span> compare is-mul?, <span class="Constant">0</span> +<span id="L101" class="LineNr">101 </span> <span class="PreProc">break-if-=</span> +<span id="L102" class="LineNr">102 </span> <span class="PreProc">var</span> _b/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L138'>pop-int-stack</a> stack +<span id="L103" class="LineNr">103 </span> <span class="PreProc">var</span> b/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy _b +<span id="L104" class="LineNr">104 </span> <span class="PreProc">var</span> a/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L138'>pop-int-stack</a> stack +<span id="L105" class="LineNr">105 </span> a <span class="SpecialChar"><-</span> multiply b +<span id="L106" class="LineNr">106 </span> <a href='rpn.mu.html#L126'>push-int-stack</a> stack, a +<span id="L107" class="LineNr">107 </span> <span class="PreProc">loop</span> $simplify:word-loop +<span id="L108" class="LineNr">108 </span> <span class="Delimiter">}</span> +<span id="L109" class="LineNr">109 </span> <span class="muComment"># otherwise it's an int</span> +<span id="L110" class="LineNr">110 </span> <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='311decimal-int.subx.html#L4'>parse-decimal-int-from-slice</a> word +<span id="L111" class="LineNr">111 </span> <a href='rpn.mu.html#L126'>push-int-stack</a> stack, n +<span id="L112" class="LineNr">112 </span> <span class="PreProc">loop</span> +<span id="L113" class="LineNr">113 </span> <span class="Delimiter">}</span> +<span id="L114" class="LineNr">114 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='rpn.mu.html#L138'>pop-int-stack</a> stack +<span id="L115" class="LineNr">115 </span> <span class="PreProc">return</span> result +<span id="L116" class="LineNr">116 </span><span class="Delimiter">}</span> +<span id="L117" class="LineNr">117 </span> +<span id="L118" class="LineNr">118 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L118'>initialize-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L59'>int-stack</a>), n: int <span class="Delimiter">{</span> +<span id="L119" class="LineNr">119 </span> <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L59'>int-stack</a>) <span class="SpecialChar"><-</span> copy _self +<span id="L120" class="LineNr">120 </span> <span class="PreProc">var</span> d/<span class="Constant">edi</span>: (addr handle array int) <span class="SpecialChar"><-</span> get self, data +<span id="L121" class="LineNr">121 </span> populate d, n +<span id="L122" class="LineNr">122 </span> <span class="PreProc">var</span> top/<span class="Constant">eax</span>: (addr int) <span class="SpecialChar"><-</span> get self, top +<span id="L123" class="LineNr">123 </span> copy-to *top, <span class="Constant">0</span> +<span id="L124" class="LineNr">124 </span><span class="Delimiter">}</span> +<span id="L125" class="LineNr">125 </span> +<span id="L126" class="LineNr">126 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L126'>push-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L59'>int-stack</a>), _val: int <span class="Delimiter">{</span> +<span id="L127" class="LineNr">127 </span> <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L59'>int-stack</a>) <span class="SpecialChar"><-</span> copy _self +<span id="L128" class="LineNr">128 </span> <span class="PreProc">var</span> top-addr/<span class="Constant">ecx</span>: (addr int) <span class="SpecialChar"><-</span> get self, top +<span id="L129" class="LineNr">129 </span> <span class="PreProc">var</span> data-ah/<span class="Constant">edx</span>: (addr handle array int) <span class="SpecialChar"><-</span> get self, data +<span id="L130" class="LineNr">130 </span> <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array int) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah +<span id="L131" class="LineNr">131 </span> <span class="PreProc">var</span> top/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy *top-addr +<span id="L132" class="LineNr">132 </span> <span class="PreProc">var</span> dest-addr/<span class="Constant">edx</span>: (addr int) <span class="SpecialChar"><-</span> index data, top +<span id="L133" class="LineNr">133 </span> <span class="PreProc">var</span> val/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy _val +<span id="L134" class="LineNr">134 </span> copy-to *dest-addr, val +<span id="L135" class="LineNr">135 </span> add-to *top-addr, <span class="Constant">1</span> +<span id="L136" class="LineNr">136 </span><span class="Delimiter">}</span> +<span id="L137" class="LineNr">137 </span> +<span id="L138" class="LineNr">138 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L138'>pop-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L59'>int-stack</a>)<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span> +<span id="L139" class="LineNr">139 </span> <span class="PreProc">var</span> self/<span class="Constant">esi</span>: (addr <a href='rpn.mu.html#L59'>int-stack</a>) <span class="SpecialChar"><-</span> copy _self +<span id="L140" class="LineNr">140 </span> <span class="PreProc">var</span> top-addr/<span class="Constant">ecx</span>: (addr int) <span class="SpecialChar"><-</span> get self, top +<span id="L141" class="LineNr">141 </span> <span class="Delimiter">{</span> +<span id="L142" class="LineNr">142 </span> compare *top-addr, <span class="Constant">0</span> +<span id="L143" class="LineNr">143 </span> <span class="PreProc">break-if-></span> +<span id="L144" class="LineNr">144 </span> <span class="PreProc">return</span> <span class="Constant">0</span> +<span id="L145" class="LineNr">145 </span> <span class="Delimiter">}</span> +<span id="L146" class="LineNr">146 </span> subtract-from *top-addr, <span class="Constant">1</span> +<span id="L147" class="LineNr">147 </span> <span class="PreProc">var</span> data-ah/<span class="Constant">edx</span>: (addr handle array int) <span class="SpecialChar"><-</span> get self, data +<span id="L148" class="LineNr">148 </span> <span class="PreProc">var</span> data/<span class="Constant">eax</span>: (addr array int) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L226'>lookup</a> *data-ah +<span id="L149" class="LineNr">149 </span> <span class="PreProc">var</span> top/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy *top-addr +<span id="L150" class="LineNr">150 </span> <span class="PreProc">var</span> result-addr/<span class="Constant">eax</span>: (addr int) <span class="SpecialChar"><-</span> index data, top +<span id="L151" class="LineNr">151 </span> <span class="PreProc">var</span> val/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy *result-addr +<span id="L152" class="LineNr">152 </span> <span class="PreProc">return</span> val +<span id="L153" class="LineNr">153 </span><span class="Delimiter">}</span> </pre> </body> </html> |