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/*
 * Copyright (c) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <arch/arch.h>

#define DCACHE_SIZE     (16 * 1024)
#define DCACHE_LINE_SIZE    32  

#define DCACHE_TAG_SHIFT    2

.register %g2, #scratch
.register %g3, #scratch

/** Flush the whole D-cache. */
.global dcache_flush
dcache_flush:
    set (DCACHE_SIZE - DCACHE_LINE_SIZE), %g1
    stxa %g0, [%g1] ASI_DCACHE_TAG
0:  membar #Sync
    subcc %g1, DCACHE_LINE_SIZE, %g1
    bnz,pt %xcc, 0b
    stxa %g0, [%g1] ASI_DCACHE_TAG
    membar #Sync            
    retl
    ! beware SF Erratum #51, do not put the MEMBAR here
    nop             

/** Flush only D-cache lines of one virtual color.
 *
 * @param o0    Virtual color to be flushed.
 */
.global dcache_flush_color
dcache_flush_color:
    mov (DCACHE_SIZE / DCACHE_LINE_SIZE) / 2, %g1
    set DCACHE_SIZE / 2, %g2
    sllx %g2, %o0, %g2
    sub %g2, DCACHE_LINE_SIZE, %g2
0:  stxa %g0, [%g2] ASI_DCACHE_TAG
    membar #Sync
    subcc %g1, 1, %g1
    bnz,pt %xcc, 0b
    sub %g2, DCACHE_LINE_SIZE, %g2
    retl
    nop

/** Flush only D-cache lines of one virtual color and one tag.
 *
 * @param o0    Virtual color to lookup the tag.
 * @param o1    Tag of the cachelines to be flushed.
 */
.global dcache_flush_tag
dcache_flush_tag:
    mov (DCACHE_SIZE / DCACHE_LINE_SIZE) / 2, %g1
    set DCACHE_SIZE / 2, %g2
    sllx %g2, %o0, %g2
    sub %g2, DCACHE_LINE_SIZE, %g2
0:  ldxa [%g2] ASI_DCACHE_TAG, %g3
    srlx %g3, DCACHE_TAG_SHIFT, %g3
    cmp %g3, %o1
    bnz 1f
    nop
    stxa %g0, [%g2] ASI_DCACHE_TAG
    membar #Sync
1:  subcc %g1, 1, %g1
    bnz,pt %xcc, 0b
    sub %g2, DCACHE_LINE_SIZE, %g2
    retl
    nop