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 (SH7727)
 *	Kernel loader
 */

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

	.text
	.balign	2
	.globl	start
	.type	start, @function

start:
clear_sysconf:
	mov.l	SYSCONF, r1
	mov	#0, r2
	mov.l	r2, @r1	

copy_kernel:
	mov.l	DEST_START, r1
	mov.l	IMAGE_START, r2
	mov.l	IMAGE_END, r3

_copy_loop:
	cmp/hi	r2, r3
	bf	jump_kernel
	mov.l	@r2+, r0
	mov.l	r0, @r1
	bra	_copy_loop
	add	#4, r1

jump_kernel:
	mov.l	DEST_START, r0
	jmp	@r0
	nop

		.balign	4
  DEST_START:	.long	Csym(__dest_start)
  IMAGE_START:	.long	Csym(__image_start)
  IMAGE_END:	.long	Csym(__image_end)

/* System common information */
  SYSCONF:	.long	0x8c000268