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start.S revision 1.6 
      1 /*	$NetBSD: start.S,v 1.6 2011/02/20 07:59:52 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jonathan Stone, Michael Hitch and Simon Burge.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 1992, 1993
     34  *	The Regents of the University of California.  All rights reserved.
     35  *
     36  * This code is derived from software contributed to Berkeley by
     37  * Ralph Campbell.
     38  *
     39  * Redistribution and use in source and binary forms, with or without
     40  * modification, are permitted provided that the following conditions
     41  * are met:
     42  * 1. Redistributions of source code must retain the above copyright
     43  *    notice, this list of conditions and the following disclaimer.
     44  * 2. Redistributions in binary form must reproduce the above copyright
     45  *    notice, this list of conditions and the following disclaimer in the
     46  *    documentation and/or other materials provided with the distribution.
     47  * 3. Neither the name of the University nor the names of its contributors
     48  *    may be used to endorse or promote products derived from this software
     49  *    without specific prior written permission.
     50  *
     51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     61  * SUCH DAMAGE.
     62  *
     63  *	@(#)start.s	8.2 (Berkeley) 1/21/94
     64  */
     65 
     66 /*
     67  * start.s -
     68  *
     69  *	Contains code that is the first executed at boot time.
     70  *
     71  *	Copyright (C) 1989 Digital Equipment Corporation.
     72  *	Permission to use, copy, modify, and distribute this software and
     73  *	its documentation for any purpose and without fee is hereby granted,
     74  *	provided that the above copyright notice appears in all copies.
     75  *	Digital Equipment Corporation makes no representations about the
     76  *	suitability of this software for any purpose.  It is provided "as is"
     77  *	without express or implied warranty.
     78  *
     79  * from: Header: /sprite/src/boot/decprom/ds3100.md/RCS/start.s,
     80  *	v 1.1 90/02/16 16:19:39 shirriff Exp  SPRITE (DECWRL)
     81  */
     82 
     83 #include <mips/asm.h>
     84 #include <mips/cpuregs.h>
     85 
     86 #include "assym.h"
     87 
     88 	.globl	start
     89 start:
     90 	.set	noreorder
     91 #ifdef __GP_SUPPORT__
     92 	PTR_LA	gp, _C_LABEL (_gp)
     93 #endif
     94 	/*
     95 	 * We assume the bootprom isn't expecting us to preserve the saved
     96 	 * registers.
     97 	 */
     98 	move	s0, a0				# save argc
     99 	move	s1, a1				# save argv
    100 	move	s2, a2				# save envp
    101 	move	s3, ra				# save RA
    102 	PTR_LA	v0, 0x80001000			# ARCBIOS_SPB
    103 	PTR_LA	a0, _C_LABEL (edata)		# clear BSS
    104 	INT_L	v0, SPB_FirmwareVector(v0)	# FirmwareVector
    105 	move	a1, zero
    106 	PTR_S	v0, _C_LABEL(ARCBIOS)		# save ARCBIOS
    107 	PTR_LA	a2, _C_LABEL (end)
    108 	jal	_C_LABEL(memset)		# memset(edata, 0, end - edata)
    109 	 PTR_SUBU a2, a2, a0
    110 	move	a0, s0				# restore argc
    111 	move	a1, s1				# restore argv
    112 	move	a2, s2				# restore envp
    113 	j	_C_LABEL(main)			# main(argc, argv)
    114 	 move	ra, s3				# restore RA
    115 
    116 	.globl	_rtt
    117 _rtt:
    118 	j	ra				# XXXX return to PROM?
    119 
    120 	.data
    121 	.global	ARCBIOS
    122 ARCBIOS: PTR_WORD	0
    123