diff options
| author | Kartik Agaram <vc@akkartik.com> | 2021-01-09 10:15:33 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2021-01-09 10:15:33 -0800 |
| commit | 8be561f59977a375af2af7cf300273d3548da2e0 (patch) | |
| tree | 183219c54824f2672d5489629eb8b476ac3abcc4 /baremetal/boot.hex | |
| parent | adf7fba7fea6940f4330d8d8e25d0f0bbca9d737 (diff) | |
| download | mu-8be561f59977a375af2af7cf300273d3548da2e0.tar.gz | |
7485
Diffstat (limited to 'baremetal/boot.hex')
| -rw-r--r-- | baremetal/boot.hex | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/baremetal/boot.hex b/baremetal/boot.hex index f57ae364..f6ded4aa 100644 --- a/baremetal/boot.hex +++ b/baremetal/boot.hex @@ -240,7 +240,7 @@ e9 fb ff # loop forever # . var index/ecx: byte 8a # copy m8 at r32 to r8 0d # 00/mod/indirect 001/r8/cl 101/rm32/use-disp32 - ce 7d 00 00 # disp32 [label] + c8 7d 00 00 # disp32 [label] # . al = *(keyboard buffer + index) 8a # copy m8 at r32 to r8 81 # 10/mod/*+disp32 000/r8/al 001/rm32/ecx @@ -270,11 +270,11 @@ e9 fb ff # loop forever # increment index fe # increment byte 05 # 00/mod/indirect 000/subop/increment 101/rm32/use-disp32 - ce 7d 00 00 # disp32 [label] + c8 7d 00 00 # disp32 [label] # clear top nibble of index (keyboard buffer is circular) 80 # and byte 25 # 00/mod/indirect 100/subop/and 101/rm32/use-disp32 - ce 7d 00 00 # disp32 [label] + c8 7d 00 00 # disp32 [label] 0f # imm8 # 155: # epilogue @@ -291,15 +291,17 @@ e9 fb ff # loop forever 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 +00 00 00 00 00 00 00 00 -# 1ce: +# 1c8: # var keyboard circular buffer # write index: nibble - 00 -# 1cf: +# still take up 4 bytes so SubX can handle it + 00 00 00 00 +# 1cc: # read index: nibble - 00 +# still take up 4 bytes so SubX can handle it + 00 00 00 00 # 1d0: # circular buffer: byte[16] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |