start.asm

	.global idt_init
	.type idt_init, @function

	idt_init:	lidt	(idtr)			# Load the idt pointed to by our idtr struct and return.
				ret


	###########################################################################
	#		                           ISRS                                   #
	###########################################################################


	.global isr0						# Divide exception
	.type isr0, @function

	isr0:	cli
			push	0					# Dummy error code
			push	0					# Reference number of exception
			jmp	isr_common_stub			# Jump to our default ISR handler


	# ... other ISR stubs go here...


	.extern isr_handle					# External function defined in isr.c to print error message etc.

	isr_common_stub:
			pusha
			push	%ds
			push	%es
			push	%fs
			push	%gs
			mov		$0x10,		%ax
			mov		%ax,		%ds
			mov		%ax,		%es
			mov		%ax,		%fs
			mov		%ax,		%gs		# Push all data segment registers onto the stack, and then load them with data segment offset
			mov		%esp,		%eax
			push	%eax				# Push the location of our stack

			mov		isr_handle,	%eax
			call	%eax				# Indirectly call isr_handle

			pop		%eax
			pop		%gs
			pop		%fs
			pop		%es
			pop		%ds
			popa
			add		$8,		%esp
			iret						# Pop everything, clean up the stack and return.