; 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
extern cpu_reg_state
extern stack_state

%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
	pushad
	;push eax
	;push ecx
	;push edx
	;push ebx

	;push esp
	;push ebp
	;push esi
	;push edi

	;push ds
	;push es 
	;push fs 
	;push gs

	call interrupt_handler

	; segments
	pop gs 
	pop fs
	pop es
	pop ds

	pop edi
	pop esi
	pop ebp
	pop esp

	pop ebx
	pop edx
	pop ecx
	pop eax

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


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