; Dispatching to our interrupt handler code from assembly because some of this is 
; enourmous pain in C

; Save the register state
; call the C handler
; executes iret(expects the stack to look like struct stack_state)


; If the interrupt we need to handle doesn't produce an error code then must provide a 0
; for consistency

extern interrupt_handler

%macro no_err_handler 1
global interrupt_handler_%1 	; defined in interrupts.h
interrupt_handler_%1:
	push dword 0
	push dword %1
	jmp common_int_handler
%endmacro

; deals with the intterrupts that do give us an error code
%macro err_code_handler 1
global interrupt_handler_%1
interrupt_handler_%1:
	push dword %1
	jmp common_int_handler
%endmacro

common_int_handler:
	; save thigns before do our C-call
	push eax
	push ebx
	push ecx
	push edx

	push cs
	push ds
	push es 
	push fs 
	push gs
	push ss

	push esi
	push edi
	push ebp
	push esp

	call interrupt_handler
	; restore state to the function
	pop eax
	pop ebx
	pop ecx
	pop edx

	pop cs
	pop ds
	pop es 
	pop fs 
	pop gs
	pop ss

	pop esi
	pop edi
	pop ebp
	pop esp
	
	add esp, 8
	; special instruction which lets us jump back to code
	; which was previously interrupted
	iret 	


no_err_handler 1
no_err_handler 2
no_err_handler 3
no_err_handler 4
no_err_handler 5
no_err_handler 6
no_err_handler 7

err_code_handler 8

no_err_handler 9

err_code_handler 10
err_code_handler 11
err_code_handler 12
err_code_handler 13
err_code_handler 14

no_err_handler 15
no_err_handler 16

err_code_handler 17