43 lines
1.1 KiB
Plaintext
43 lines
1.1 KiB
Plaintext
# Test out the video mode by filling in the screen with pixels.
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#
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# To run, first prepare a realistically sized disk image:
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# dd if=/dev/zero of=disk.img count=20160 # 512-byte sectors, so 10MB
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# Load the program on the disk image:
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# cat baremetal/boot.hex baremetal/ex2.hex |./bootstrap run apps/hex > a.bin
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# dd if=a.bin of=disk.img conv=notrunc
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# To run:
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# qemu-system-i386 disk.img
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# Or:
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# bochs -f baremetal/boot.bochsrc # boot.bochsrc loads disk.img
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#
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# Expected output:
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# html/baremetal.png
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# main: (address 0x9400)
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# ecx <- LFB
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8b # copy *rm32 to r32
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0d # 00/mod/indirect 001/r32/ecx 101/rm32/use-disp32
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28 81 00 00 # disp32 [label]
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# eax <- LFB + 0xbffff (1024*768 - 1)
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8d # copy-address rm32 to r32
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81 # 10/mod/*+disp32 000/r32/eax 001/rm32/ecx
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ff ff 0b 00 # disp32
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# $loop:
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# if (eax < ecx) break
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39 # compare rm32 with r32
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c8 # 11/mod/direct 001/r32/ecx 000/rm32/eax
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7c 05 # break if < [label]
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# *eax <- al
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88 # copy r8 to m8 at r32
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00 # 00/mod/indirect 000/r8/AL 000/rm32/eax
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48 # decrement eax
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eb f7 # loop to -9 bytes [label]
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# $break:
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e9 fb ff ff ff # hang indefinitely
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# vim:ft=subx
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