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irq.asm
128 lines (120 loc) · 2.08 KB
/
irq.asm
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global _irq0
global _irq1
global _irq2
global _irq3
global _irq4
global _irq5
global _irq6
global _irq7
global _irq8
global _irq9
global _irq10
global _irq11
global _irq12
global _irq13
global _irq14
global _irq15
_irq0:
cli
push byte 0
push byte 32
jmp irq_common_stub
_irq1:
cli
push byte 0
push byte 33
jmp irq_common_stub
_irq2:
cli
push byte 0
push byte 34
jmp irq_common_stub
_irq3:
cli
push byte 0
push byte 35
jmp irq_common_stub
_irq4:
cli
push byte 0
push byte 36
jmp irq_common_stub
_irq5:
cli
push byte 0
push byte 37
jmp irq_common_stub
_irq6:
cli
push byte 0
push byte 38
jmp irq_common_stub
_irq7:
cli
push byte 0
push byte 39
jmp irq_common_stub
_irq8:
cli
push byte 0
push byte 40
jmp irq_common_stub
_irq9:
cli
push byte 0
push byte 41
jmp irq_common_stub
_irq10:
cli
push byte 0
push byte 42
jmp irq_common_stub
_irq11:
cli
push byte 0
push byte 43
jmp irq_common_stub
_irq12:
cli
push byte 0
push byte 44
jmp irq_common_stub
_irq13:
cli
push byte 0
push byte 45
jmp irq_common_stub
_irq14:
cli
push byte 0
push byte 46
jmp irq_common_stub
_irq15:
cli
push byte 0
push byte 47
jmp irq_common_stub
extern _irq_handler
; This is a stub that we have created for IRQ based ISRs. This calls
; '_irq_handler' in our C code. We need to create this in an 'irq.c'
irq_common_stub:
pusha ; Pushes edi, esi, ebp, esp, ebx, edx, ecx,
; eax
mov ax, ds ; Lower 16-bits of eax = ds
push eax ; Save the data segment descriptor
mov ax, 0x10 ; Load the kernel data segment descriptor
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
call _irq_handler
pop eax ; Reload the original data segment descriptor
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
popa ; Pops edi, esi, ebp...
add esp, 8 ; Cleans up pushed error code and pushed ISR
; number.
sti
iret ; Pops 5 things at once: CS, EIP, EFLAGS, SS and ESP!