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| author | Kartik Agaram <vc@akkartik.com> | 2020-12-20 23:52:21 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-12-20 23:52:21 -0800 |
| commit | 6ac16fd1ae275fb4042ab4aa85df3ccc86f3e615 (patch) | |
| tree | da0ba1415ac3a5d596d745cc0a7e1f8db125433f | |
| parent | a350fb4c687a3f65c26d7546b358292285faef91 (diff) | |
| download | mu-6ac16fd1ae275fb4042ab4aa85df3ccc86f3e615.tar.gz | |
7369 - read hard disk using BIOS
There were two problems: a) We have only 1 sector per track (spt=1), so 'second sector' is meaningless. b) Drives 0-127 are reserved for floppies.
| -rw-r--r-- | apps/boot.bochsrc.floppy | 6 | ||||
| -rw-r--r-- | apps/boot.hex | 4 |
2 files changed, 2 insertions, 8 deletions
diff --git a/apps/boot.bochsrc.floppy b/apps/boot.bochsrc.floppy deleted file mode 100644 index 07e40607..00000000 --- a/apps/boot.bochsrc.floppy +++ /dev/null @@ -1,6 +0,0 @@ -# Configuration for the Bochs x86 CPU emulator to run the output of apps/boot.hex -# See apps/boot.hex for more details. - -floppya: 1_44=boot.bin, status=inserted -boot: floppy -log: - diff --git a/apps/boot.hex b/apps/boot.hex index fc80b442..a95c1de7 100644 --- a/apps/boot.hex +++ b/apps/boot.hex @@ -34,10 +34,10 @@ # 00: # load_disk: b4 02 # ah <- 2 # read sectors from disk - b2 00 # dl <- 0 # drive 0 + b2 80 # dl <- 80 # hdd 0 b5 00 # ch <- 0 # cylinder 0 b6 00 # dh <- 0 # track 0 - b1 02 # cl <- 2 # sector 1 (second sector, 1-based) + b1 01 # cl <- 1 # sector 0 (first 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 |