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| author | Kartik Agaram <vc@akkartik.com> | 2020-12-28 00:12:06 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-12-28 00:12:06 -0800 |
| commit | 437fa654cbba0f29c0a73754803aa00404f0f3a2 (patch) | |
| tree | 648e13ccd1187fcb493c4ad291b286b49942acb1 /baremetal/boot.hex | |
| parent | 5d2f1c57a58341ee5c793c2eb445159813e37160 (diff) | |
| download | mu-437fa654cbba0f29c0a73754803aa00404f0f3a2.tar.gz | |
7437 - baremetal: draw pixel on keyboard event
It's now clear that our keyboard handler doesn't trigger after the first event.
Diffstat (limited to 'baremetal/boot.hex')
| -rw-r--r-- | baremetal/boot.hex | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/baremetal/boot.hex b/baremetal/boot.hex index 6090eef3..cae8b456 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 - cf 7d 00 00 # disp32 [label] + ce 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 @@ -263,12 +263,12 @@ e9 fb ff # loop forever # increment index fe # increment byte 05 # 00/mod/indirect 000/subop/increment 101/rm32/use-disp32 - cf 7d 00 00 # disp32 [label] + ce 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 - cf 7d 00 00 # disp32 [label] - f0 # imm8 + ce 7d 00 00 # disp32 [label] + 0f # imm8 # 14d: # epilogue 61 # pop all registers @@ -284,12 +284,16 @@ 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 00 00 00 00 00 00 00 +# 1ce: +# var keyboard circular buffer +# write index: nibble +00 # 1cf: -# var keyboard circular buffer index: nibble +# read index: nibble 00 -# var keyboard circular buffer: byte[16] +# circular buffer: byte[16] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # padding |