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start.S revision 1.2 
      1 /*	$NetBSD: start.S,v 1.2 2000/10/12 05:34:29 onoe Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1999 Tsubai Masanari.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <mips/asm.h>
     30 #include <mips/cpuregs.h>
     31 
     32 	.text
     33 	.align	2
     34 	.set	noreorder
     35 
     36 	.globl	_start
     37 _start:
     38 	b	1f
     39 	nop
     40 	.word	0x19900106		/* version? */
     41 	.word	0
     42 
     43 	/* disklabel here */
     44 	.space	0x1f0
     45 
     46 1:	bgez	a3, 2f			/* load address */
     47 	lui	v0, 0xa000		/* 0xa0000000 for non-APbus */
     48 	ori	v0, 0x1000		/* 0xa0001000 for APbus */
     49 2:	la	v1, _start		/* relocate myself */
     50 	la	t1, _end
     51 3:	lw	t0, 0(v0)
     52 	addu	v1, 4
     53 	sw	t0, -4(v1)
     54 	bne	v1, t1, 3b
     55 	addu	v0, 4
     56 	bgez	a3, 4f
     57 	nop
     58 	lw	t0, 16(sp)
     59 	sw	t0, _sip
     60 4:	li	sp, 0xa0001000
     61 	la	v0, bootxx
     62 	j	v0
     63 	nop
     64