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 (S1C38K)
 *	Kernel loader
 */

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

/* System common information */
#define	SYSINFO		0x100041c0
#define	SYSCONF		(SYSINFO + 8)

	.text
	.balign	4
	.globl	start
	.type	start, %function
start:
clear_sysconf:
	ldr	r4, =SYSCONF
	ldr	r5, =0
	str	r5, [r4]

copy_kernel:
	ldr	r4, =__dest_start
	ldr	r5, =__image_start
	ldr	r6, =__image_end

_copy_loop:
	ldr	r7, [r5], #4
	str	r7, [r4], #4
	cmp	r5, r6
	blo	_copy_loop

jump_kernel:
	ldr	pc, =__dest_start
	nop