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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-15 21:46:53 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-15 21:46:53 -0700 |
| commit | 7119d79b8a9a4023414f7664a011e40fafb44dfd (patch) | |
| tree | 23bf14e1498c6c833f7e68b4272ffb01ec638bee | |
| parent | fd224d83f511c8cb0e8a70393d6f1c47dd88d1f1 (diff) | |
| download | mu-7119d79b8a9a4023414f7664a011e40fafb44dfd.tar.gz | |
snapshot: write to disk using BIOS
Requires the following commands: dd if=/dev/zero of=data.img count=20160 ./translate life.mu qemu-system-i386 -hda disk.img -hdb data.img Before running Qemu, data.img will contain all 0s. After quitting Qemu, data.img will contain the first 512 bytes of disk.img.
| -rw-r--r-- | boot.bochsrc | 1 | ||||
| -rw-r--r-- | boot.subx | 14 |
2 files changed, 15 insertions, 0 deletions
diff --git a/boot.bochsrc b/boot.bochsrc index a1c8a4bc..360cbe40 100644 --- a/boot.bochsrc +++ b/boot.bochsrc @@ -10,6 +10,7 @@ display_library: sdl2 ata0-master: type=disk, path="disk.img", mode=flat, cylinders=20, heads=16, spt=63 # 10MB, 512 bytes per sector +ata1-master: type=disk, path="data.img", mode=flat, cylinders=20, heads=16, spt=63 # 10MB, 512 bytes per sector boot: disk # PS/2 mouse requires black magic that I don't know how to explain. log: - diff --git a/boot.subx b/boot.subx index 412940d6..7f278c33 100644 --- a/boot.subx +++ b/boot.subx @@ -109,6 +109,20 @@ bb/copy-to-bx 0/imm16 8e/->seg 3/mod/direct 3/rm32/bx 0/r32/es + # write 1 sector of disk to disk 1 + b4/copy-to-ah 3/imm8 # write sectors to disk + b2/copy-to-dl 0x81/imm8 # disk 1 + b5/copy-to-ch 0/imm8 # cylinder 0 + b6/copy-to-dh 0/imm8 # track 0 + b1/copy-to-cl 1/imm8 # first sector, 1-based + b0/copy-to-al 1/imm8 # number of sectors to write + # address to read sectors from = es:bx = 0x7c00, contiguous with boot segment + bb/copy-to-bx 0/imm16 + 8e/->seg 3/mod/direct 3/rm32/bx 0/r32/es + bb/copy-to-bx 0x7c00/imm16 + cd/syscall 0x13/imm8/bios-disk-services + 0f 82/jump-if-carry disk_error/disp16 + # adjust video mode b4/copy-to-ah 0x4f/imm8 # VBE commands b0/copy-to-al 2/imm8 # set video mode |