diff options
| author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-15 14:53:23 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-15 15:03:33 -0700 |
| commit | 2a8f6641665bc556b48dd8833587d03a1b1d7191 (patch) | |
| tree | 8b8f704359ed9816b45700f368715ba95ba02040 /boot.subx | |
| parent | dae57050670077fbefdd47d3ac1218295a08d711 (diff) | |
| download | mu-2a8f6641665bc556b48dd8833587d03a1b1d7191.tar.gz | |
get shell/ working
This mutates the expected binary.
Diffstat (limited to 'boot.subx')
| -rw-r--r-- | boot.subx | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/boot.subx b/boot.subx index b8789acd..4e651910 100644 --- a/boot.subx +++ b/boot.subx @@ -54,17 +54,17 @@ # initialize segment registers b8/copy-to-ax 0/imm16 - 8e/->seg 3/mod/direct 0/rm32/ax 3/rm32/ds - 8e/->seg 3/mod/direct 0/rm32/ax 0/rm32/es - 8e/->seg 3/mod/direct 0/rm32/ax 4/rm32/fs - 8e/->seg 3/mod/direct 0/rm32/ax 5/rm32/gs + 8e/->seg 3/mod/direct 0/rm32/ax 3/r32/ds + 8e/->seg 3/mod/direct 0/rm32/ax 0/r32/es + 8e/->seg 3/mod/direct 0/rm32/ax 4/r32/fs + 8e/->seg 3/mod/direct 0/rm32/ax 5/r32/gs # initialize stack to 0x00070000 # We don't read or write the stack before we get to 32-bit mode, but BIOS # calls do. We need to move the stack in case BIOS initializes it to some # low address that we want to write code into. b8/copy-to-ax 0x7000/imm16 - 8e/->seg 3/mod/direct 0/rm32/ax 2/rm32/ss + 8e/->seg 3/mod/direct 0/rm32/ax 2/r32/ss bc/copy-to-esp 0/imm16 # undo the A20 hack: https://en.wikipedia.org/wiki/A20_line |