diff options
| author | Kartik K. Agaram <vc@akkartik.com> | 2021-06-29 22:45:33 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-06-29 22:46:26 -0700 |
| commit | c76679dbff6b3f350fbf0696a0d986514ba11676 (patch) | |
| tree | 0f872e62d310c24d0ec3728b3b5ce4b1b53766df /boot.subx | |
| parent | 1083f2a400d926d57bc9dc6ab412f54295719bfc (diff) | |
| download | mu-c76679dbff6b3f350fbf0696a0d986514ba11676.tar.gz | |
more general timer interface
Diffstat (limited to 'boot.subx')
| -rw-r--r-- | boot.subx | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/boot.subx b/boot.subx index 2a896a97..6e622a03 100644 --- a/boot.subx +++ b/boot.subx @@ -351,23 +351,8 @@ timer-interrupt-handler: b0/copy-to-al 0x20/imm8 e6/write-al-into-port 0x20/imm8 31/xor %eax 0/r32/eax - # ecx = *Timer-current-color - 8b/-> *Timer-current-color 1/r32/ecx # update *Timer-current-color - 81 0/subop/add *Timer-current-color 0x01010101/imm32 - # eax = *Video-memory + 0x1200 (a few rows down from top, around middle of screen) - 8b/-> *Video-memory-addr 0/r32/eax - 05/add-to-eax 0x1200/imm32 - 89/copy *eax 1/r32/ecx - # eax += 0x400 - 05/add-to-eax 0x400/imm32 - 89/copy *eax 1/r32/ecx - # eax += 0x400 - 05/add-to-eax 0x400/imm32 - 89/copy *eax 1/r32/ecx - # eax += 0x400 - 05/add-to-eax 0x400/imm32 - 89/copy *eax 1/r32/ecx + ff 0/subop/increment *Timer-counter $timer-interrupt-handler:epilogue: # epilogue 9d/pop-flags @@ -376,7 +361,7 @@ $timer-interrupt-handler:epilogue: cf/return-from-interrupt == data -Timer-current-color: +Timer-counter: 0/imm32 == code |