ranger - mirror of ranger - a simple, vim-like file manager

	Commit message (Expand)	Author	Age	Files	Lines
*	removed unneccessary check	hut	2009-06-16	1	-1/+0
*	reset filetype association system	hut	2009-06-15	2	-66/+66
*	added filetype rules	hut	2009-06-15	1	-1/+7
*	added a couple of new application definitions	hut	2009-06-15	1	-3/+25
*	handle video and audio differently in data/types	hut	2009-06-15	1	-2/+4
*	add colors for video + image + sound	hut	2009-06-15	1	-0/+7
*	add checks	hut	2009-06-13	1	-0/+6
*	extended colorschemes to statusbar	hut	2009-06-13	1	-5/+9
*	fixing & cleaning up	hut	2009-06-13	2	-15/+56
*	cleaning up	hut	2009-06-13	2	-4/+5
*	rewrite of the way files are executed, easier config	hut	2009-06-13	2	-0/+93
*	expanded color scheme support	hut	2009-06-13	1	-10/+20
*	completed colorscheme support	hut	2009-06-12	1	-1/+8
*	implementing colorschemes, work in progress	hut	2009-06-12	1	-0/+11
*	moved screensaver, cleanups	hut	2009-06-12	1	-0/+10
*	lots of changes. version 0.2.1 v0.2.1	hut	2009-05-09	3	-0/+790

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# A minimal bootable image that: # - loads more sectors past the first boot sector (using BIOS primitives) # - switches to 32-bit mode (giving up access to BIOS primitives) # - sets up a keyboard handler to print '1' at the top-left of screen when '1' is typed # # When it's ready to accept keys, it prints 'H' to the top-left of the screen. # # If the initial load fails, it prints 'D' to the top-left of the screen and # halts. # # To convert to a disk image, first prepare a realistically sized disk image: # dd if=/dev/zero of=code.img count=20160 # 512-byte sectors, so 10MB # Now fill in sectors: # linux/bootstrap/bootstrap run linux/hex < apps/boot0.hex > boot.bin # dd if=boot.bin of=code.img conv=notrunc # To run: # qemu-system-i386 code.img # # Since we start out in 16-bit mode, we need instructions SubX doesn't # support. # This file contains just lowercase hex bytes and comments. Zero # error-checking. Make liberal use of: # - comments documenting expected offsets # - size checks on the emitted file (currently: 512 bytes) # - xxd to eyeball that offsets contain expected bytes ## 16-bit entry point # Upon reset, the IBM PC # loads the first sector (512 bytes) # from some bootable image (see the boot sector marker at the end of this file) # to the address range [0x7c00, 0x7e00) # offset 00 (address 0x7c00): # disable interrupts for this initialization fa # cli # initialize segment registers # this isn't always needed, but the recommendation is to not make assumptions b8 00 00 # ax <- 0 8e d8 # ds <- ax 8e d0 # ss <- ax 8e c0 # es <- ax 8e e0 # fs <- ax 8e e8 # gs <- ax # We don't read or write the stack before we get to 32-bit mode. No function # calls, so we don't need to initialize the stack. # 0e: # load more sectors from disk b4 02 # ah <- 2 # read sectors from disk # dl comes conveniently initialized at boot time with the index of the device being booted b5 00 # ch <- 0 # cylinder 0 b6 00 # dh <- 0 # track 0 b1 02 # cl <- 2 # second sector, 1-based b0 01 # al <- 1 # number of sectors to read # address to write sectors to = es:bx = 0x7e00, contiguous with boot segment bb 00 00 # bx <- 0 8e c3 # es <- bx bb 00 7e # bx <- 0x7e00 cd 13 # int 13h, BIOS disk service 0f 82 76 00 # jump-if-carry disk-error # 26: # undo the A20 hack: https://en.wikipedia.org/wiki/A20_line # this is from https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S # seta20.1: e4 64 # al <- port 0x64 a8 02 # set zf if bit 1 (second-least significant) is not set 75 fa # if zf not set, goto seta20.1 (-6) b0 d1 # al <- 0xd1 e6 64 # port 0x64 <- al # 30: # seta20.2: e4 64 # al <- port 0x64 a8 02 # set zf if bit 1 (second-least significant) is not set 75 fa # if zf not set, goto seta20.2 (-6) b0 df # al <- 0xdf e6 64 # port 0x64 <- al # 3a: # switch to 32-bit mode 0f 01 16 # lgdt 00/mod/indirect 010/subop 110/rm/use-disp16 80 7c # *gdt_descriptor # 3f: 0f 20 c0 # eax <- cr0 66 83 c8 01 # eax <- or 0x1 0f 22 c0 # cr0 <- eax ea c0 7c 08 00 # far jump to initialize_32bit_mode after setting cs to the record at offset 8 in the gdt (gdt_code) # padding # 4e: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ## GDT: 3 records of 8 bytes each # 60: # gdt_start: # gdt_null: mandatory null descriptor 00 00 00 00 00 00 00 00 # gdt_code: (offset 8 from gdt_start) ff ff # limit[0:16] 00 00 00 # base[0:24] 9a # 1/present 00/privilege 1/descriptor type = 1001b # 1/code 0/conforming 1/readable 0/accessed = 1010b cf # 1/granularity 1/32-bit 0/64-bit-segment 0/AVL = 1100b # limit[16:20] = 1111b 00 # base[24:32] # gdt_data: (offset 16 from gdt_start) ff ff # limit[0:16] 00 00 00 # base[0:24] 92 # 1/present 00/privilege 1/descriptor type = 1001b # 0/data 0/conforming 1/readable 0/accessed = 0010b cf # same as gdt_code 00 # base[24:32] # gdt_end: # padding # 78: 00 00 00 00 00 00 00 00 # 80: # gdt_descriptor: 17 00 # final index of gdt = gdt_end - gdt_start - 1 60 7c 00 00 # start = gdt_start # padding # 85: 00 00 00 00 00 00 00 00 00 00 # 90: # disk_error: # print 'D' to top-left of screen to indicate disk error # *0xb8000 <- 0x0f44 # bx <- 0xb800 bb 00 b8 # ds <- bx 8e db # 11b/mod 011b/reg/ds 011b/rm/bx # al <- 'D' b0 44 # ah <- 0x0f # white on black b4 0f # bx <- 0 bb 00 00 # *ds:bx <- ax 89 07 # 00b/mod/indirect 000b/reg/ax 111b/rm/bx e9 fb ff # loop forever # padding # a1: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ## 32-bit code from this point (still some instructions not in SubX) # c0: # initialize_32bit_mode: 66 b8 10 00 # ax <- offset 16 from gdt_start 8e d8 # ds <- ax 8e d0 # ss <- ax 8e c0 # es <- ax 8e e0 # fs <- ax 8e e8 # gs <- ax # load interrupt handlers 0f 01 1d # lidt 00/mod/indirect 011/subop 101/rm32/use-disp32 00 7f 00 00 # *idt_descriptor # enable keyboard IRQ b0 fd # al <- 0xfd # enable just IRQ1 e6 21 # port 0x21 <- al # initialization is done; enable interrupts fb e9 21 00 00 00 # jump to 0x7d00 # padding # df: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ## 'application' SubX code: print one character to top-left of screen # offset 100 (address 0x7d00): # Entry: # eax <- *0x7ff4 # random address in second segment containing 'H' 8b # copy rm32 to r32 05 # 00/mod/indirect 000/r32/eax 101/rm32/use-disp32 # disp32 f4 7f 00 00 # *0xb8000 <- eax 89 # copy r32 to rm32 05 # 00/mod/indirect 000/r32/eax 101/rm32/use-disp32 # disp32 00 80 0b 00 e9 fb ff ff ff # loop forever # padding # 111: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # 120: # null interrupt handler: cf # iret # padding # 121: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # 130: # keyboard interrupt handler: # prologue fa # disable interrupts 60 # push all registers to stack # acknowledge interrupt b0 20 # al <- 0x20 e6 20 # port 0x20 <- al # check output buffer of 8042 keyboard controller (https://web.archive.org/web/20040604041507/http://panda.cs.ndsu.nodak.edu/~achapwes/PICmicro/keyboard/atkeyboard.html) e4 64 # al <- port 0x64 a8 01 # set zf if bit 0 (least significant) is not set 74 11 # if bit 0 is not set, skip to epilogue # read keycode into eax 31 c0 # eax <- xor eax; 11/direct 000/r32/eax 000/rm32/eax e4 60 # al <- port 0x60 # map key '1' to ascii; if eax == 2, eax = 0x31 3d 02 00 00 00 # compare eax with 0x02 75 0b # if not equal, goto epilogue b8 31 0f 00 00 # eax <- 0x0f31 # print eax to top-left of screen (*0xb8000) 89 # copy r32 to rm32 05 # 00/mod/indirect 000/r32/eax 101/rm32/use-disp32 # disp32 00 80 0b 00 # epilogue 61 # pop all registers fb # enable interrupts cf # iret # padding # 155 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # final 2 bytes of boot sector 55 aa ## sector 2 # loaded by load_disk, not automatically on boot # offset 200 (address 0x7e00): interrupt descriptor table # 32 entries * 8 bytes each = 256 bytes (0x100) # idt_start: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # entry 8: clock 20 7d # target[0:16] = null interrupt handler 08 00 # segment selector (gdt_code) 00 # unused 8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate 00 00 # target[16:32] # entry 9: keyboard 30 7d # target[0:16] = keyboard interrupt handler 08 00 # segment selector (gdt_code) 00 # unused 8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate 00 00 # target[16:32] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # idt_end: # offset 300 (address 0x7f00): # idt_descriptor: ff 00 # idt_end - idt_start - 1 00 7e 00 00 # start = idt_start # padding 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 48 0f 00 00 00 00 00 00 00 00 00 00 # spot the 'H' with attributes # offset 400 (address 0x8000) # vim:ft=conf