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/*
 * Copyright (c) 2007 Michal Kebrt
 * 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.
 */

/** @addtogroup arm32mm 
 * @{
 */
/** @file
 *  @brief TLB related functions.
 */

#include <mm/tlb.h>
#include <arch/mm/asid.h>
#include <arch/asm.h>
#include <arch/types.h>
#include <arch/mm/page.h>

/** Invalidate all entries in TLB.
 *
 * @note See ARM Architecture reference section 3.7.7 for details.
 */
void tlb_invalidate_all(void)
{
    asm volatile (
        "eor r1, r1\n"
        "mcr p15, 0, r1, c8, c7, 0\n"
        : : : "r1"
    );
}

/** Invalidate all entries in TLB that belong to specified address space.
 *
 * @param asid Ignored as the ARM architecture doesn't support ASIDs.
 */
void tlb_invalidate_asid(asid_t asid)
{
    tlb_invalidate_all();
}

/** Invalidate single entry in TLB
 *
 * @param page Virtual adress of the page
 */ 
static inline void invalidate_page(uintptr_t page)
{
    asm volatile (
        "mcr p15, 0, %0, c8, c7, 1"     
        :
        : "r" (page)
    );
}

/** Invalidate TLB entries for specified page range belonging to specified
 * address space.
 *
 * @param asid Ignored as the ARM architecture doesn't support it.
 * @param page Address of the first page whose entry is to be invalidated.
 * @param cnt Number of entries to invalidate.
 */
void tlb_invalidate_pages(asid_t asid __attribute__((unused)), uintptr_t page, count_t cnt)
{
    unsigned int i;

    for (i = 0; i < cnt; i++)
        invalidate_page(page + i * PAGE_SIZE);
}

/** @}
 */