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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.

 */

/** @addtogroup sparc64mm  

 * @{

 */

/** @file

 */

#include <arch/mm/tsb.h>

#include <arch/mm/tlb.h>

#include <arch/mm/page.h>

#include <arch/barrier.h>

#include <mm/as.h>

#include <arch/types.h>

#include <macros.h>

#include <debug.h>

#define TSB_INDEX_MASK  ((1 << (21 + 1 + TSB_SIZE - MMU_PAGE_WIDTH)) - 1)

/** Invalidate portion of TSB.

 *

 * We assume that the address space is already locked. Note that respective

 * portions of both TSBs are invalidated at a time.

 *

 * @param as Address space.

 * @param page First page to invalidate in TSB.

 * @param pages Number of pages to invalidate. Value of (count_t) -1 means the

 *  whole TSB.

 */

void tsb_invalidate(as_t *as, uintptr_t page, count_t pages)

{

    index_t i0, i;

    count_t cnt;

    ASSERT(as->arch.itsb && as->arch.dtsb);

    i0 = (page >> MMU_PAGE_WIDTH) & TSB_INDEX_MASK;

    ASSERT(i0 < ITSB_ENTRY_COUNT && i0 < DTSB_ENTRY_COUNT);

    if (pages == (count_t) -1 || (pages * 2) > ITSB_ENTRY_COUNT)

        cnt = ITSB_ENTRY_COUNT;

    else

        cnt = pages * 2;

    for (i = 0; i < cnt; i++) {

        as->arch.itsb[(i0 + i) & (ITSB_ENTRY_COUNT - 1)].tag.invalid =

            true;

        as->arch.dtsb[(i0 + i) & (DTSB_ENTRY_COUNT - 1)].tag.invalid =

            true;

    }

}

/** Copy software PTE to ITSB.

 *

 * @param t     Software PTE.

 * @param index Zero if lower 8K-subpage, one if higher 8K subpage.

 */

void itsb_pte_copy(pte_t *t, index_t index)

{

    as_t *as;

    tsb_entry_t *tsb;

    index_t entry;

    ASSERT(index <= 1);

    as = t->as;

    entry = ((t->page >> MMU_PAGE_WIDTH) + index) & TSB_INDEX_MASK;

    ASSERT(entry < ITSB_ENTRY_COUNT);

    tsb = &as->arch.itsb[entry];

    /*

     * We use write barriers to make sure that the TSB load

     * won't use inconsistent data or that the fault will

     * be repeated.

     */

    tsb->tag.invalid = true;    /* invalidate the entry

                     * (tag target has this

                     * set to 0) */

    write_barrier();

    tsb->tag.context = as->asid;

    /* the shift is bigger than PAGE_WIDTH, do not bother with index  */

    tsb->tag.va_tag = t->page >> VA_TAG_PAGE_SHIFT;

    tsb->data.value = 0;

    tsb->data.size = PAGESIZE_8K;

    tsb->data.pfn = (t->frame >> MMU_FRAME_WIDTH) + index;

    tsb->data.cp = t->c;    /* cp as cache in phys.-idxed, c as cacheable */

    tsb->data.p = t->k; /* p as privileged, k as kernel */

    tsb->data.v = t->p; /* v as valid, p as present */

    write_barrier();

    tsb->tag.invalid = false;   /* mark the entry as valid */

}

/** Copy software PTE to DTSB.

 *

 * @param t Software PTE.

 * @param index Zero if lower 8K-subpage, one if higher 8K-subpage.

 * @param ro    If true, the mapping is copied read-only.

 */

void dtsb_pte_copy(pte_t *t, index_t index, bool ro)

{

    as_t *as;

    tsb_entry_t *tsb;

    index_t entry;

    ASSERT(index <= 1);

    as = t->as;

    entry = ((t->page >> MMU_PAGE_WIDTH) + index) & TSB_INDEX_MASK;

    ASSERT(entry < DTSB_ENTRY_COUNT);

    tsb = &as->arch.dtsb[entry];

    /*

     * We use write barriers to make sure that the TSB load

     * won't use inconsistent data or that the fault will

     * be repeated.

     */

    tsb->tag.invalid = true;    /* invalidate the entry

                     * (tag target has this

                     * set to 0) */

    write_barrier();

    tsb->tag.context = as->asid;

    /* the shift is bigger than PAGE_WIDTH, do not bother with index */

    tsb->tag.va_tag = t->page >> VA_TAG_PAGE_SHIFT;

    tsb->data.value = 0;

    tsb->data.size = PAGESIZE_8K;

    tsb->data.pfn = (t->frame >> MMU_FRAME_WIDTH) + index;

    tsb->data.cp = t->c;

#ifdef CONFIG_VIRT_IDX_DCACHE

    tsb->data.cv = t->c;

#endif /* CONFIG_VIRT_IDX_DCACHE */

    tsb->data.p = t->k;     /* p as privileged */

    tsb->data.w = ro ? false : t->w;

    tsb->data.v = t->p;

    write_barrier();

    tsb->tag.invalid = false;   /* mark the entry as valid */

}

/** @}

 */