168 lines
2.8 KiB
NASM
168 lines
2.8 KiB
NASM
[BITS 32]
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[GLOBAL isr_stub_table]
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[GLOBAL irq_stub_table]
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extern irq_handler ; C function
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section .text
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; --------------------------------------------
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; ------------------- IRQs -------------------
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; --------------------------------------------
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%macro irq_stub 1
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irq_stub_%+%1:
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pusha
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push ds
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push es
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push fs
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push gs
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mov ax, 0x10
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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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push dword %1 ; Push IRQ number
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call irq_handler
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add esp, 4 ; Clean up stack
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; Send EOI
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mov al, 0x20
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mov bl, %1
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cmp bl, 8
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jb .skip_slave_eoi
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out 0xA0, al
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.skip_slave_eoi:
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out 0x20, al
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pop gs
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pop fs
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pop es
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pop ds
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popa
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iret
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%endmacro
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; Define 16 IRQ stubs
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irq_stub 0
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irq_stub 1
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irq_stub 2
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irq_stub 3
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irq_stub 4
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irq_stub 5
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irq_stub 6
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irq_stub 7
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irq_stub 8
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irq_stub 9
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irq_stub 10
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irq_stub 11
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irq_stub 12
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irq_stub 13
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irq_stub 14
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irq_stub 15
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irq_stub_table:
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%assign i 0
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%rep 16
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dd irq_stub_%+i
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%assign i i+1
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%endrep
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; --------------------------------------------
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; ------------------- ISRs -------------------
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; --------------------------------------------
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; Common exception handler entry point
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isr_common_handler:
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pusha ; Push general-purpose registers
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push ds
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push es
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push fs
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push gs
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; Load known-good segment selectors
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mov ax, 0x10
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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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; Print exception number and error code
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; You can insert direct port writes or call kernel logging function here
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; For now, just hang
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.halt:
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cli
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hlt
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jmp .halt
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; If you want to later restore:
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pop gs
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pop fs
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pop es
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pop ds
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popa
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add esp, 8 ; clean up int_no + err_code
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iret
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; Macro: for exceptions with error code
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%macro isr_err_stub 1
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isr_stub_%+%1:
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cli
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push dword %1 ; interrupt number
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jmp isr_common_handler
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%endmacro
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; Macro: for exceptions without error code
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%macro isr_no_err_stub 1
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isr_stub_%+%1:
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cli
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push dword 0 ; fake error code
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push dword %1 ; interrupt number
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jmp isr_common_handler
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%endmacro
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; Define all 32 exception stubs
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isr_no_err_stub 0
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isr_no_err_stub 1
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isr_no_err_stub 2
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isr_no_err_stub 3
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isr_no_err_stub 4
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isr_no_err_stub 5
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isr_no_err_stub 6
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isr_no_err_stub 7
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isr_err_stub 8
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isr_no_err_stub 9
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isr_err_stub 10
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isr_err_stub 11
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isr_err_stub 12
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isr_err_stub 13
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isr_err_stub 14
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isr_no_err_stub 15
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isr_no_err_stub 16
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isr_err_stub 17
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isr_no_err_stub 18
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isr_no_err_stub 19
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isr_no_err_stub 20
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isr_no_err_stub 21
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isr_no_err_stub 22
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isr_no_err_stub 23
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isr_no_err_stub 24
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isr_no_err_stub 25
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isr_no_err_stub 26
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isr_no_err_stub 27
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isr_no_err_stub 28
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isr_no_err_stub 29
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isr_err_stub 30
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isr_no_err_stub 31
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; Create jump table
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isr_stub_table:
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%assign i 0
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%rep 32
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dd isr_stub_%+i
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%assign i i+1
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%endrep
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