/*      $NetBSD: start.S,v 1.7 2008/04/28 20:23:16 martin Exp $ */

/*
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Wayne Knowles
 *
 * 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.
 */

#include <mips/asm.h>
#include <mips/cache_r4k.h>

LEAF(start)
        .set    noreorder
        .set    mips3
#ifdef __GP_SUPPORT__
        la      gp, _C_LABEL (_gp)
#endif
        la      sp, start - CALLFRAME_SIZ
        sw      zero, CALLFRAME_RA(sp)          # clear ra for debugger
        sw      zero, CALLFRAME_SP(sp)          # clear fp for debugger
        move    s0, a0                          # save argc
        move    s1, a1                          # save argv

        jal     _C_LABEL(flushcache)
         nop

        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

        move    a0, s0                          # restore argc
        jal     _C_LABEL(main)                  # main(unsigned int)
        move    a1, s1                          # restore argv

XLEAF(_rtt)
        jal     _C_LABEL(cpu_reboot)            # failed, reboot
        nop
END(start)

LEAF(flushcache)
        li      t0, 0x80000000
        addu    t1, t0, 32*1024         /* flush 32KB */
        subu    t1, t1, 0x100           /* per 256 bytes */

1:
        /* flush I-cache */
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x000(t0)
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x020(t0)
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x040(t0)
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x060(t0)
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x080(t0)
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0a0(t0)
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0c0(t0)
        cache   CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0e0(t0)

        /* flush D-cache */
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x000(t0)
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x020(t0)
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x040(t0)
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x060(t0)
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x080(t0)
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0a0(t0)
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0c0(t0)
        cache   CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0e0(t0)

        bne     t0, t1, 1b
         addu   t0, t0, 0x100

        j       ra
         nop
END(flushcache)