NetBSD/sys/arch/pmax/stand/common/start.S

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/* $NetBSD: start.S,v 1.16 1999/11/27 06:49:34 simonb Exp $ */
1999-11-27 06:10:06 +03:00
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jonathan Stone, Michael Hitch and Simon Burge.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)start.s 8.2 (Berkeley) 1/21/94
*/
/*
* start.s -
*
* Contains code that is the first executed at boot time.
*
* Copyright (C) 1989 Digital Equipment Corporation.
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies.
* Digital Equipment Corporation makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* from: Header: /sprite/src/boot/decprom/ds3100.md/RCS/start.s,
* v 1.1 90/02/16 16:19:39 shirriff Exp SPRITE (DECWRL)
*/
#include <mips/asm.h>
#include <mips/cpuregs.h>
#include <machine/dec_prom.h>
.extern callv, 4
.globl start
start:
.set noreorder
#ifdef __GP_SUPPORT__
la gp, _C_LABEL (_gp)
#endif
la sp, start - CALLFRAME_SIZ
sw zero, CALLFRAME_RA(sp) # Zero out old ra for debugger
sw zero, CALLFRAME_SP(sp) # Zero out old fp for debugger
move s0, a0 # save argc
move s1, a1 # save argv
beq a2, DEC_REX_MAGIC, 1f # jump if boot from DS5000
move s3, a3 # BDslot: save call vector
la s3, _C_LABEL(callvec) # init call vector
1:
la a0, _C_LABEL (edata) # clear BSS
move a1, zero
la a2, _C_LABEL (end)
jal _C_LABEL(memset) # memset(edata, 0, end - edata)
subu a2, a2, a0
sw s3, _C_LABEL(callv) # save call vector
move a0, s0 # restore argc
jal _C_LABEL(main) # main(argc, argv)
move a1, s1 # restore argv
j _C_LABEL(prom_restart) # restart...
nop
LEAF(prom_restart)
XLEAF(_rtt)
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lw v0, _C_LABEL (callv)
lw v0, 0x9C(v0) /* halt */
move a0, zero /* Don't print anything. */
j v0
move a1, zero
END(prom_restart)
LEAF(prom_open)
li v0, DEC_PROM_OPEN
j v0
nop
END(prom_open)
#ifndef LIBSA_NO_DEV_CLOSE
LEAF(prom_close)
li v0, DEC_PROM_CLOSE
j v0
nop
END(prom_close)
#endif
LEAF(prom_lseek)
li v0, DEC_PROM_LSEEK
j v0
nop
END(prom_lseek)
LEAF(prom_read)
li v0, DEC_PROM_READ
j v0
nop
END(prom_read)
LEAF(prom_write)
li v0, DEC_PROM_WRITE
j v0
nop
END(prom_read)