;************************************************************************************

%macro COMMONSTUB 1
[EXTERN idt_%1Handler]
%1_common_stub:

	pusha                    ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax

	mov ax, ds               ; Lower 16-bits of eax = ds.
	push eax                 ; save the data segment descriptor

	mov ax, 0x10  ; load the kernel data segment descriptor
	mov ds, ax
	mov es, ax
	mov fs, ax
	mov gs, ax

	; pass the register data structure as a pointer to the function
	; (passing it directly results in GCC trashing the data when doing optimisations)
	mov eax, esp
	push eax
	call idt_%1Handler
	add esp, 4

	pop eax        ; reload the original data segment descriptor
	mov ds, ax
	mov es, ax
	mov fs, ax
	mov gs, ax

	popa                     ; Pops edi,esi,ebp...
	add esp, 8     ; Cleans up the pushed error code and pushed ISR number
	iret
%endmacro

COMMONSTUB isr
COMMONSTUB irq
COMMONSTUB syscall

;************************************************************************************

%macro ISR_NOERRCODE 1  ; define a macro, taking one parameter
	[GLOBAL isr%1]        ; %1 accesses the first parameter.
	isr%1:
		push byte 0
		push byte %1
		jmp isr_common_stub
%endmacro

%macro ISR_ERRCODE 1
	[GLOBAL isr%1]
	isr%1:
		push byte %1
		jmp isr_common_stub
%endmacro

%macro IRQ 2
	[GLOBAL irq%1]
	irq%1:
		push byte %1	;push irq number
		push byte %2	;push int number
		jmp irq_common_stub
%endmacro

%macro SYSCALL 1
	[GLOBAL syscall%1]
	syscall%1:
		cli
		push byte 0
		push byte %1
		jmp syscall_common_stub
%endmacro

ISR_NOERRCODE 0
ISR_NOERRCODE 1
ISR_NOERRCODE 2
ISR_NOERRCODE 3
ISR_NOERRCODE 4
ISR_NOERRCODE 5
ISR_NOERRCODE 6
ISR_NOERRCODE 7
ISR_ERRCODE 8
ISR_NOERRCODE 9
ISR_ERRCODE 10
ISR_ERRCODE 11
ISR_ERRCODE 12
ISR_ERRCODE 13
ISR_ERRCODE 14
ISR_NOERRCODE 15
ISR_NOERRCODE 16
ISR_NOERRCODE 17
ISR_NOERRCODE 18
ISR_NOERRCODE 19
ISR_NOERRCODE 20
ISR_NOERRCODE 21
ISR_NOERRCODE 22
ISR_NOERRCODE 23
ISR_NOERRCODE 24
ISR_NOERRCODE 25
ISR_NOERRCODE 26
ISR_NOERRCODE 27
ISR_NOERRCODE 28
ISR_NOERRCODE 29
ISR_NOERRCODE 30
ISR_NOERRCODE 31

IRQ	0,	32
IRQ	1,	33
IRQ	2,	34
IRQ	3,	35
IRQ	4,	36
IRQ	5,	37
IRQ	6,	38
IRQ	7,	39
IRQ	8,	40
IRQ	9,	41
IRQ	10,	42
IRQ	11,	43
IRQ	12,	44
IRQ	13,	45
IRQ	14,	46
IRQ	15,	47

SYSCALL 64

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