/*      $NetBSD: start.S,v 1.6 2011/02/20 07:59:52 matt Exp $   */

/*-
 * 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.
 *
 * 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. 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 "assym.h"

        .globl  start
start:
        .set    noreorder
#ifdef __GP_SUPPORT__
        PTR_LA  gp, _C_LABEL (_gp)
#endif
        /*
         * We assume the bootprom isn't expecting us to preserve the saved
         * registers.
         */
        move    s0, a0                          # save argc
        move    s1, a1                          # save argv
        move    s2, a2                          # save envp
        move    s3, ra                          # save RA
        PTR_LA  v0, 0x80001000                  # ARCBIOS_SPB
        PTR_LA  a0, _C_LABEL (edata)            # clear BSS
        INT_L   v0, SPB_FirmwareVector(v0)      # FirmwareVector
        move    a1, zero
        PTR_S   v0, _C_LABEL(ARCBIOS)           # save ARCBIOS
        PTR_LA  a2, _C_LABEL (end)
        jal     _C_LABEL(memset)                # memset(edata, 0, end - edata)
         PTR_SUBU a2, a2, a0
        move    a0, s0                          # restore argc
        move    a1, s1                          # restore argv
        move    a2, s2                          # restore envp
        j       _C_LABEL(main)                  # main(argc, argv)
         move   ra, s3                          # restore RA

        .globl  _rtt
_rtt:
        j       ra                              # XXXX return to PROM?

        .data
        .global ARCBIOS
ARCBIOS: PTR_WORD       0