/*      $NetBSD: ip22_cache.S,v 1.5 2005/12/11 12:18:58 christos Exp $  */

/*
 * Copyright 2001 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * 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 for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */

/*
 * Code to manipulate the L2 SysAD cache on R4600-based SGI IP22/24 systems.
 */

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

        .set    noreorder
        .set    mips3

#define PROLOGUE                                                        \
        mfc0    t0, MIPS_COP_0_STATUS                           ;       \
        nop                                                     ;       \
        nop                                                     ;       \
        nop                                                     ;       \
        li      v0, ~MIPS_SR_INT_IE     /* ints off */          ;       \
        and     t1, v0, t0                                      ;       \
        or      t1, MIPS3_SR_KX         /* enable 64-bit */     ;       \
        mtc0    t1, MIPS_COP_0_STATUS                           ;       \
        nop                                                     ;       \
        nop                                                     ;       \
        nop                                                     ;       \
        nop

#define EPILOGUE                                                        \
        mtc0    t0, MIPS_COP_0_STATUS                           ;       \
        nop                                                     ;       \
        nop                                                     ;       \
        nop                                                     ;       \
        nop

/*
 * ip22_sdcache_do_wbinv:
 *
 *      Write-back and invalidate the cache lines [a0..a1].
 */
LEAF_NOPROFILE(ip22_sdcache_do_wbinv)
        PROLOGUE

        /*
         * Translate the cache indices into the magic cache
         * flush space.
         */
        dli     v0, 0x9000000080000000  /* base of cache flush space */
        or      a0, v0                  /* first */
        or      a1, v0                  /* last */

        /*
         * Flush the cache by performing a store into the
         * magic cache flush space.
         */
1:      sw      zero, 0(a0)
        bne     a0, a1, 1b
        daddu   a0, 32

        EPILOGUE

        j       ra
        nop
END(ip22_sdcache_do_wbinv)

LEAF_NOPROFILE(ip22_sdcache_enable)
        PROLOGUE

        li      a0, 0x1
        dsll    a0, 31
        lui     a1, 0x9000
        dsll32  a1, 0
        or      a0, a1, a0
        sb      zero, 0(a0)

        EPILOGUE

        j       ra
        nop
END(ip22_sdcache_enable)

LEAF_NOPROFILE(ip22_sdcache_disable)
        PROLOGUE

        li      a0, 0x1
        dsll    a0, 31
        lui     a1, 0x9000
        dsll32  a1, 0
        or      a0, a1, a0
        sh      zero, 0(a0)

        EPILOGUE

        j       ra
        nop
END(ip22_sdcache_disable)