loader.s

T-kernel 的extension源代码

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	loader.S (VR4131)
 *	Kernel loader
 */

#include <machine.h>
#include <tk/asm.h>

/* System common information */
#define SYSCONF		(SCINFO + 8)

	.text
	.balign	4
	.globl	start
	.type	start, %function
start:
clear_sysconf:
	lui	$t7, shigh(SCINFO)
	sw	$zero, slow(SYSCONF)($t7)

copy_kernel:
	la	$t1, __dest_start
	la	$t2, __image_start
	la	$t3, __image_end

_copy_loop:
	lw	$t0, ($t2)
	addu	$t2, $t2, 4
	sw	$t0, ($t1)
	addu	$t1, $t1, 4
	bltu	$t2, $t3, _copy_loop

jump_kernel:
	la	$t1, __dest_start
	jr	$t1
	nop