pikhq

GLOBAL asm_load_idt
GLOBAL inthandler_default
EXTERN int_handler

%macro ISR_ERROR 1
isr%1:  cli
        push byte %1            ; Interrupt number
        jmp inthandler_handled
%endmacro

%macro ISR_NOERROR 1
isr%1:  cli
        push byte 0             ; No error
        push byte %1            ; Interrupt number
        jmp inthandler_handled
%endmacro
        
asm_load_idt:
        mov eax, [esp + 4]
        lidt [eax]
        ret
        
inthandler_default:
        push byte 0xFF          ; ERROR 0xFF INT 0xFF indicates unspecified interrupt
        push byte 0xFF
        jmp inthandler_handled
        
inthandler_handled:
        pushad
        cli

        mov eax, ds
        push eax
        
        mov eax, 0x10
        mov ds, eax
        mov es, eax
        mov fs, eax
        mov gs, eax

        call int_handler

        pop ds
        mov ds, eax
        mov es, eax
        mov fs, eax
        mov gs, eax

        popad
        sti
        iret

                
GLOBAL isr
isr:
%assign i 0
%rep 19
        dd isr %+ i
%endrep

%assign i 0
%rep 19
%if (i == 8) || ((i >= 10) && (i <= 14))
        ISR_ERROR i
%else
        ISR_NOERROR i
%endif
%assign i i + 1
%endrep