30 lines
428 B
ArmAsm
30 lines
428 B
ArmAsm
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format elf64
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public __pic_rtc_IRQ8
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public __pic_rtc_IRQHandler;
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section '.bss' writable
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__pic_rtc_IRQHandler:
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rq 1
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section '.text' executable
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__pic_rtc_IRQ8:
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push rax
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; read the register C byte or the interrupt will block
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mov al, 0x0c
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out 0x70, al
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in al, 0x71
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; tell if the irq handler is NULL
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mov rax, [__pic_rtc_IRQHandler]
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test rax, rax
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pop rax
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jz .end
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jmp qword [__pic_rtc_IRQHandler]
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.end:
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iret
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