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90 lines
1.8 KiB
90 lines
1.8 KiB
[bits 32]
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[extern isr_handler]
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%macro ISR_NOERRORCODE 1 ; define a macro, taking one parameter
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[GLOBAL isr%1] ; %1 accesses the first parameter.
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isr%1:
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cli
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push byte 0
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push byte %1
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jmp isr_common_stub
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%endmacro
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%macro ISR_ERRORCODE 1
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[GLOBAL isr%1]
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isr%1:
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cli
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push byte %1
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jmp isr_common_stub
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%endmacro
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ISR_NOERRORCODE 0
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ISR_NOERRORCODE 1
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ISR_NOERRORCODE 2
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ISR_NOERRORCODE 3
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ISR_NOERRORCODE 4
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ISR_NOERRORCODE 5
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ISR_NOERRORCODE 6
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ISR_NOERRORCODE 7
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ISR_ERRORCODE 8
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ISR_NOERRORCODE 9
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ISR_ERRORCODE 10
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ISR_ERRORCODE 11
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ISR_ERRORCODE 12
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ISR_ERRORCODE 13
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ISR_ERRORCODE 14
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ISR_NOERRORCODE 15
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ISR_NOERRORCODE 16
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ISR_NOERRORCODE 17
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ISR_NOERRORCODE 18
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ISR_NOERRORCODE 19
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ISR_NOERRORCODE 20
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ISR_NOERRORCODE 21
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ISR_NOERRORCODE 22
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ISR_NOERRORCODE 23
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ISR_NOERRORCODE 24
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ISR_NOERRORCODE 25
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ISR_NOERRORCODE 26
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ISR_NOERRORCODE 27
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ISR_NOERRORCODE 28
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ISR_NOERRORCODE 29
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ISR_NOERRORCODE 30
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ISR_NOERRORCODE 31
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; In isr.c
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[EXTERN isr_handler]
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; This is our common ISR stub. It saves the processor state, sets
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; up for kernel mode segments, calls the C-level fault handler,
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; and finally restores the stack frame.
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isr_common_stub:
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pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
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mov ax, ds ; Lower 16-bits of eax = ds.
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push eax ; save the data segment descriptor
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mov ax, 0x10 ; load the kernel data segment descriptor
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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call isr_handler
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pop eax ; reload the original data segment descriptor
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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popa ; Pops edi,esi,ebp...
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add esp, 8 ; Cleans up the pushed error code and pushed ISR number
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sti
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iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
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[GLOBAL idt_flush]
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idt_flush:
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mov eax, [esp + 4]
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lidt [eax]
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ret
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