#################################################################################
#	File : reset.s
#	Author : Alain Greiner
#	Date : 28/08/2006
#################################################################################
# 	This is a minimal boot code : 
#	- It initializes the Status Register (SR) 
#	- It defines the stack size  and initializes the stack pointer ($29) 
#	- It initializes the global pointer ($28) that is used by GCC to
#	  optimize acces to the global variables.
#	- It initializes the EPC register, and jump to the main address
#################################################################################
		
	.section .reset,"ax",@progbits

	.extern	seg_stack_base
	.extern	seg_data_base
	.extern	main

	.globl  reset	 			# makes reset an external symbol 
	.ent	reset
	.func	reset
	.align	2

reset:
       	.set noreorder

# initializes SR register
       	li	$26,	0x00000013		
       	mtc0	$26,	$12			

# initializes stack pointer
	la	$29,	seg_stack_base
	addiu	$29,	$29,	0x4000	

# initializes global pointer
	la	$28,	seg_data_base   

# jump to main in kernel mode
	la	$26,	main
	mtc0	$26, 	$14
	eret

	.end	reset
	.size	reset, .-reset

	.set reorder