/*      $NetBSD: start64.S,v 1.3 2008/04/28 20:23:34 martin 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>

#       .extern ARCBIOS, 4

        .globl  start
start:
        .set    noreorder
#ifdef __GP_SUPPORT__
        dla     gp, _C_LABEL (_gp)
#endif
        daddi   sp, - (CALLFRAME_SIZ * 2)
        sd      ra, CALLFRAME_RA * 2(sp)        # Save RA
        sd      a0, 0(sp)                       # save argc
        sd      a1, 8(sp)                       # save argv
        sd      a2, 16(sp)                      # save envp
        dla     v0, 0xa800000000001000          # ARCBIOS_SPB
        dla     a0, _C_LABEL (edata)            # clear BSS
        ld      v0, 64(v0)                      # FirmwareVector (64-bit offset)
        move    a1, zero
        sd      v0, _C_LABEL(ARCBIOS)           # save ARCBIOS
        dla     a2, _C_LABEL (end)
        jal     _C_LABEL(memset)                # memset(edata, 0, end - edata)
        dsubu   a2, a2, a0
        ld      a0, 0(sp)                       # restore argc
        ld      a1, 8(sp)                       # restore argv
        jal     _C_LABEL(main)                  # main(argc, argv)
        ld      a2, 16(sp)                      # restore envp
        ld      ra, CALLFRAME_RA * 2(sp)        # restore RA
        j       ra                              # return to PROM
        daddi   sp, CALLFRAME_SIZ * 2           # BDslot: adjust stack

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

        .data
        .global ARCBIOS
ARCBIOS: .data  0