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proc attach_int_handler stdcall, irq:dword, handler:dword, user_data:dword
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proc attach_int_handler stdcall, irq:dword, handler:dword, user_data:dword
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         locals
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         locals
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           .irqh dd ?
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           .irqh dd ?
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         endl
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         endl
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         xchg bx, bx
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         and [.irqh], 0
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         and [.irqh], 0
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         test ecx, ecx
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         test ecx, ecx
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         jz .fail
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         jz .fail
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         mov eax, [ecx]
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         mov eax, [ecx]
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         mov [next_irqh], eax
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         mov [next_irqh], eax
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         mov [.irqh], ecx
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         mov [.irqh], ecx
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         mov [irq_failed+ebx*4], 0  ;clear counter
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         mov eax, [user_data]
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         mov eax, [user_data]
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         mov [ecx+IRQH.handler], edx
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         mov [ecx+IRQH.handler], edx
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         mov [ecx+IRQH.data],    eax
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         mov [ecx+IRQH.data],    eax
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         lea edx, [irqh_tab+ebx*8]
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         list_add_tail ecx, edx     ;clobber eax
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         lea edx, [irqh_tab+ebx*8]
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         list_add_tail ecx, edx     ;clobber eax
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         stdcall enable_irq, [irq]
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         stdcall enable_irq, ebx
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