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Diffstat (limited to 'html/baremetal/101screen.subx.html')
| -rw-r--r-- | html/baremetal/101screen.subx.html | 88 |
1 files changed, 41 insertions, 47 deletions
diff --git a/html/baremetal/101screen.subx.html b/html/baremetal/101screen.subx.html index 1f204a59..b41c8b85 100644 --- a/html/baremetal/101screen.subx.html +++ b/html/baremetal/101screen.subx.html @@ -55,53 +55,47 @@ if ('onhashchange' in window) { <a href='https://github.com/akkartik/mu/blob/main/baremetal/101screen.subx'>https://github.com/akkartik/mu/blob/main/baremetal/101screen.subx</a> <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Primitives for screen control.</span> -<span id="L2" class="LineNr"> 2 </span> -<span id="L3" class="LineNr"> 3 </span>== code -<span id="L4" class="LineNr"> 4 </span> -<span id="L5" class="LineNr"> 5 </span><span class="subxFunction">pixel</span>: <span class="subxComment"># screen: (addr screen), x: int, y: int, color: int</span> -<span id="L6" class="LineNr"> 6 </span> <span class="subxS1Comment"># . prologue</span> -<span id="L7" class="LineNr"> 7 </span> 55/push-ebp -<span id="L8" class="LineNr"> 8 </span> 89/<- %ebp 4/r32/esp -<span id="L9" class="LineNr"> 9 </span> <span class="subxS1Comment"># . save registers</span> -<span id="L10" class="LineNr">10 </span> 50/push-eax -<span id="L11" class="LineNr">11 </span> 51/push-ecx -<span id="L12" class="LineNr">12 </span> <span class="subxComment"># ecx = screen</span> -<span id="L13" class="LineNr">13 </span> 8b/-> *(ebp+8) 1/r32/ecx -<span id="L14" class="LineNr">14 </span> 81 7/subop/compare %ecx 0/imm32 -<span id="L15" class="LineNr">15 </span> { -<span id="L16" class="LineNr">16 </span> 75/jump-if-!= <span class="Constant">break</span>/disp8 -<span id="L17" class="LineNr">17 </span> <span class="subxComment"># bounds checks</span> -<span id="L18" class="LineNr">18 </span> 8b/-> *(ebp+0xc) 0/r32/eax -<span id="L19" class="LineNr">19 </span> 3d/compare-eax-and 0/imm32 -<span id="L20" class="LineNr">20 </span> 7c/jump-if-< $pixel:end/disp8 -<span id="L21" class="LineNr">21 </span> 3d/compare-eax-and 0x400/imm32/1024 -<span id="L22" class="LineNr">22 </span> 7d/jump-if->= $pixel:end/disp8 -<span id="L23" class="LineNr">23 </span> 8b/-> *(ebp+0x10) 0/r32/eax -<span id="L24" class="LineNr">24 </span> 3d/compare-eax-and 0/imm32 -<span id="L25" class="LineNr">25 </span> 7c/jump-if-< $pixel:end/disp8 -<span id="L26" class="LineNr">26 </span> 3d/compare-eax-and 0x300/imm32/768 -<span id="L27" class="LineNr">27 </span> 7d/jump-if->= $pixel:end/disp8 -<span id="L28" class="LineNr">28 </span> <span class="subxComment"># eax = y*1024 + x</span> -<span id="L29" class="LineNr">29 </span> 8b/-> *(ebp+0x10) 0/r32/eax -<span id="L30" class="LineNr">30 </span> c1/shift 4/subop/left %eax 0xa/imm8 -<span id="L31" class="LineNr">31 </span> 03/add-> *(ebp+0xc) 0/r32/eax -<span id="L32" class="LineNr">32 </span> <span class="subxComment"># eax += location of frame buffer</span> -<span id="L33" class="LineNr">33 </span> 03/add-> *0x7f28 0/r32/eax -<span id="L34" class="LineNr">34 </span> <span class="subxComment"># *eax = color</span> -<span id="L35" class="LineNr">35 </span> 8b/-> *(ebp+0x14) 1/r32/ecx -<span id="L36" class="LineNr">36 </span> 88/byte<- *eax 1/r32/CL -<span id="L37" class="LineNr">37 </span> <span class="subxComment"># return</span> -<span id="L38" class="LineNr">38 </span> eb $pixel:end/disp8 -<span id="L39" class="LineNr">39 </span> } -<span id="L40" class="LineNr">40 </span> <span class="subxComment"># TODO: fake screen</span> -<span id="L41" class="LineNr">41 </span><span class="Constant">$pixel:end</span>: -<span id="L42" class="LineNr">42 </span> <span class="subxS1Comment"># . restore registers</span> -<span id="L43" class="LineNr">43 </span> 59/pop-to-ecx -<span id="L44" class="LineNr">44 </span> 58/pop-to-eax -<span id="L45" class="LineNr">45 </span> <span class="subxS1Comment"># . epilogue</span> -<span id="L46" class="LineNr">46 </span> 89/<- %esp 5/r32/ebp -<span id="L47" class="LineNr">47 </span> 5d/pop-to-ebp -<span id="L48" class="LineNr">48 </span> c3/return +<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span> +<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># We need to do this in machine code because Mu doesn't have global variables</span> +<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># yet (for the start of video memory).</span> +<span id="L5" class="LineNr"> 5 </span> +<span id="L6" class="LineNr"> 6 </span>== code +<span id="L7" class="LineNr"> 7 </span> +<span id="L8" class="LineNr"> 8 </span><span class="subxFunction">pixel-on-real-screen</span>: <span class="subxComment"># x: int, y: int, color: int</span> +<span id="L9" class="LineNr"> 9 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L10" class="LineNr">10 </span> 55/push-ebp +<span id="L11" class="LineNr">11 </span> 89/<- %ebp 4/r32/esp +<span id="L12" class="LineNr">12 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L13" class="LineNr">13 </span> 50/push-eax +<span id="L14" class="LineNr">14 </span> 51/push-ecx +<span id="L15" class="LineNr">15 </span> <span class="subxComment"># bounds checks</span> +<span id="L16" class="LineNr">16 </span> 8b/-> *(ebp+8) 0/r32/eax +<span id="L17" class="LineNr">17 </span> 3d/compare-eax-and 0/imm32 +<span id="L18" class="LineNr">18 </span> 7c/jump-if-< $pixel-on-real-screen:end/disp8 +<span id="L19" class="LineNr">19 </span> 3d/compare-eax-and 0x400/imm32/screen-width=1024 +<span id="L20" class="LineNr">20 </span> 7d/jump-if->= $pixel-on-real-screen:end/disp8 +<span id="L21" class="LineNr">21 </span> 8b/-> *(ebp+0xc) 0/r32/eax +<span id="L22" class="LineNr">22 </span> 3d/compare-eax-and 0/imm32 +<span id="L23" class="LineNr">23 </span> 7c/jump-if-< $pixel-on-real-screen:end/disp8 +<span id="L24" class="LineNr">24 </span> 3d/compare-eax-and 0x300/imm32/screen-height=768 +<span id="L25" class="LineNr">25 </span> 7d/jump-if->= $pixel-on-real-screen:end/disp8 +<span id="L26" class="LineNr">26 </span> <span class="subxComment"># eax = y*1024 + x</span> +<span id="L27" class="LineNr">27 </span> 8b/-> *(ebp+0xc) 0/r32/eax +<span id="L28" class="LineNr">28 </span> c1/shift 4/subop/left %eax 0xa/imm8 +<span id="L29" class="LineNr">29 </span> 03/add-> *(ebp+8) 0/r32/eax +<span id="L30" class="LineNr">30 </span> <span class="subxComment"># eax += location of frame buffer</span> +<span id="L31" class="LineNr">31 </span> 03/add-> *0x7f28 0/r32/eax <span class="subxComment"># unsafe</span> +<span id="L32" class="LineNr">32 </span> <span class="subxComment"># *eax = color</span> +<span id="L33" class="LineNr">33 </span> 8b/-> *(ebp+0x10) 1/r32/ecx +<span id="L34" class="LineNr">34 </span> 88/byte<- *eax 1/r32/CL +<span id="L35" class="LineNr">35 </span><span class="Constant">$pixel-on-real-screen:end</span>: +<span id="L36" class="LineNr">36 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L37" class="LineNr">37 </span> 59/pop-to-ecx +<span id="L38" class="LineNr">38 </span> 58/pop-to-eax +<span id="L39" class="LineNr">39 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L40" class="LineNr">40 </span> 89/<- %esp 5/r32/ebp +<span id="L41" class="LineNr">41 </span> 5d/pop-to-ebp +<span id="L42" class="LineNr">42 </span> c3/return </pre> </body> </html> |