diff options
| author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-14 22:29:12 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-14 22:29:12 -0700 |
| commit | 97c0176a1860fbdc122ff306d9ac3d351851ef7e (patch) | |
| tree | 37a9481f978cfbdd73b20fe9bbaceaa08f2142a2 | |
| parent | 31922300454f7d4c05a304f9d4971435aca7c523 (diff) | |
| download | mu-97c0176a1860fbdc122ff306d9ac3d351851ef7e.tar.gz | |
.
| -rw-r--r-- | boot.subx | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/boot.subx b/boot.subx index b027dd89..8ba735b0 100644 --- a/boot.subx +++ b/boot.subx @@ -96,7 +96,7 @@ bb/copy-to-bx 0/imm16 8e/seg-> 3/mod/direct 3/rm32/bx 0/r32/es bb/copy-to-bx 0x7e00/imm16 - cd/syscall 0x13/imm8/bios-disk-service + cd/syscall 0x13/imm8/bios-disk-services == data 0f 82 a3 00 # jump-if-carry disk_error [label] == code @@ -112,7 +112,7 @@ bb/copy-to-bx 0x1780/imm16 8e/seg-> 3/mod/direct 3/rm32/bx 0/r32/es bb/copy-to-bx 0/imm16 - cd/syscall 0x13/imm8/bios-disk-service + cd/syscall 0x13/imm8/bios-disk-services == data 0f 82 9b 00 # jump-if-carry disk_error [label] == code @@ -128,21 +128,25 @@ bb/copy-to-bx 0x2740/imm16 8e/seg-> 3/mod/direct 3/rm32/bx 0/r32/es bb/copy-to-bx 0/imm16 - cd/syscall 0x13/imm8/bios-disk-service + cd/syscall 0x13/imm8/bios-disk-services == data 0f 82 9b 00 # jump-if-carry disk_error [label] +== code # reset es - bb 00 00 # bx <- 0 - 8e c3 # es <- bx + bb/copy-to-bx 0/imm16 + 8e/seg-> 3/mod/direct 3/rm32/bx 0/r32/es # adjust video mode - b4 4f # ah <- 4f (VBE) - b0 02 # al <- 02 (set video mode) - bb 05 41 # bx <- 0x0105 (graphics 1024x768x256 - # 0x4000 bit = configure linear frame buffer in Bochs emulator; hopefully this doesn't hurt anything when running natively) - # fallback mode: 0x0101 (640x480x256) - cd 10 # int 10h, Vesa BIOS extensions + b4/copy-to-ah 0x4f/imm8 # VBE commands + b0/copy-to-al 2/imm8 # set video mode + bb/copy-to-bx 0x4105/imm16 # 0x0105 | 0x4000 + # 0x0105 = graphics mode 1024x768x256 + # (alternative candidate: 0x0101 for 640x480x256) + # 0x4000 bit = configure linear frame buffer in Bochs emulator; hopefully this doesn't hurt anything when running natively + cd/syscall 0x10/imm8/bios-video-services + +== data # load information for the (hopefully) current video mode # mostly just for the address to the linear frame buffer |