; vi:filetype=nasm ts=8 sts=8 sw=8:

PIC1_CMD	equ 020h
PIC2_CMD	equ 0a0h
OCW2_EOI	equ 020h
OCW3_ISR	equ 00bh
IRQ_OFFSET	equ 32
%define IRQ_TO_INTR(x)	((x) + IRQ_OFFSET)
%define INTR_TO_IRQ(x)	((x) - IRQ_OFFSET)


%macro set_irq_vector 2
	push dword IRQ_TO_INTR(%1)
	push dword %2
	call set_intr
%endmacro

%macro mask_irq 1
%if %1 < 8
%assign port PIC1_DATA
%assign mask (1 << %1)
%else
%assign port PIC2_DATA
%assign mask (1 << (%1 - 8))
%endif
	in al, port
	or al, mask
	out port, al
%endmacro

%macro unmask_irq 1
%if %1 < 8
%assign port PIC1_DATA
%assign mask ~(1 << %1)
%else
%assign port PIC2_DATA
%assign mask ~(1 << (%1 - 8))
%endif
	in al, port
	and al, mask
	out port, al
%endmacro

%macro end_of_irq 1
	mov al, OCW2_EOI
%if %1 >= 8
	out PIC2_CMD, al
%endif
	out PIC1_CMD, al
%endmacro

	extern idt

%ifndef INTR_ASM_
	extern set_intr
%endif