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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-06-29 21:54:22 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-06-29 21:54:22 -0700 |
| commit | 069a8df45c13e2d390211ddf9aebe09a34f2e510 (patch) | |
| tree | 37d79f9c1b112844a0c246b410083b0e779a1f28 | |
| parent | 5616691621ea4da75fb29713851da31a15d4cb81 (diff) | |
| download | mu-069a8df45c13e2d390211ddf9aebe09a34f2e510.tar.gz | |
.
| -rw-r--r-- | timer.subx | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/timer.subx b/timer.subx index 9095b323..31c42955 100644 --- a/timer.subx +++ b/timer.subx @@ -292,7 +292,13 @@ idt_start: 8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate 0/imm16 # target[16:32] -- timer-interrupt-handler must be within address 0x10000 -00 00 00 00 00 00 00 00 +# entry 9: keyboard + null-interrupt-handler/imm16 # target[0:16] + 8/imm16 # segment selector (gdt_code) + 00 # unused + 8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate + 0/imm16 # target[16:32] -- null-interrupt-handler must be within address 0x10000 + 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 @@ -320,6 +326,22 @@ idt_start: == code +null-interrupt-handler: + # prologue + fa/disable-interrupts + 60/push-all-registers + 9c/push-flags + # acknowledge interrupt + b0/copy-to-al 0x20/imm8 + e6/write-al-into-port 0x20/imm8 + 31/xor %eax 0/r32/eax +$null-interrupt-handler:epilogue: + # epilogue + 9d/pop-flags + 61/pop-all-registers + fb/enable-interrupts + cf/return-from-interrupt + timer-interrupt-handler: # prologue fa/disable-interrupts |