source: mainline/kernel/arch/sparc64/src/mm/sun4v/tsb.c

/*
 * Copyright (c) 2006 Jakub Jermar
 * Copyright (c) 2009 Pavel Rimsky
 * 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 kernel_sparc64_mm
 * @{
 */
/** @file
 */

#include <arch/mm/tsb.h>
#include <arch/mm/pagesize.h>
#include <arch/mm/tlb.h>
#include <arch/mm/page.h>
#include <barrier.h>
#include <assert.h>
#include <mm/as.h>
#include <typedefs.h>
#include <macros.h>

/** 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, size_t pages)
{
        tsb_entry_t *tsb;
        size_t i0, i;
        size_t cnt;

        assert(as->arch.tsb_description.tsb_base);

        i0 = (page >> MMU_PAGE_WIDTH) & TSB_ENTRY_MASK;

        if (pages == (size_t) -1 || pages > TSB_ENTRY_COUNT)
                cnt = TSB_ENTRY_COUNT;
        else
                cnt = pages;

        tsb = (tsb_entry_t *) PA2KA(as->arch.tsb_description.tsb_base);
        for (i = 0; i < cnt; i++)
                tsb[(i0 + i) & TSB_ENTRY_MASK].data.v = false;
}

/** Copy software PTE to ITSB.
 *
 * @param t     Software PTE.
 */
void itsb_pte_copy(pte_t *t)
{
        as_t *as;
        tsb_entry_t *tsb;
        tsb_entry_t *tte;
        size_t index;

        as = t->as;
        index = (t->page >> MMU_PAGE_WIDTH) & TSB_ENTRY_MASK;

        tsb = (tsb_entry_t *) PA2KA(as->arch.tsb_description.tsb_base);
        tte = &tsb[index];

        /*
         * We use write barriers to make sure that the TSB load
         * won't use inconsistent data or that the fault will
         * be repeated.
         */

        tte->data.v = false;

        write_barrier();

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

        tte->data.value = 0;
        tte->data.nfo = false;
        tte->data.ra = t->frame >> MMU_FRAME_WIDTH;
        tte->data.ie = false;
        tte->data.e = false;
        tte->data.cp = t->c;    /* cp as cache in phys.-idxed, c as cacheable */
        tte->data.cv = false;
        tte->data.p = t->k;     /* p as privileged, k as kernel */
        tte->data.x = true;
        tte->data.w = false;
        tte->data.size = PAGESIZE_8K;

        write_barrier();

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

/** Copy software PTE to DTSB.
 *
 * @param t     Software PTE.
 * @param ro    If true, the mapping is copied read-only.
 */
void dtsb_pte_copy(pte_t *t, bool ro)
{
        as_t *as;
        tsb_entry_t *tsb;
        tsb_entry_t *tte;
        size_t index;

        as = t->as;
        index = (t->page >> MMU_PAGE_WIDTH) & TSB_ENTRY_MASK;
        tsb = (tsb_entry_t *) PA2KA(as->arch.tsb_description.tsb_base);
        tte = &tsb[index];

        /*
         * We use write barriers to make sure that the TSB load
         * won't use inconsistent data or that the fault will
         * be repeated.
         */

        tte->data.v = false;

        write_barrier();

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

        tte->data.value = 0;
        tte->data.nfo = false;
        tte->data.ra = t->frame >> MMU_FRAME_WIDTH;
        tte->data.ie = false;
        tte->data.e = false;
        tte->data.cp = t->c;    /* cp as cache in phys.-idxed, c as cacheable */
#ifdef CONFIG_VIRT_IDX_DCACHE
        tte->data.cv = t->c;
#endif /* CONFIG_VIRT_IDX_DCACHE */
        tte->data.p = t->k;     /* p as privileged, k as kernel */
        tte->data.x = true;
        tte->data.w = ro ? false : t->w;
        tte->data.size = PAGESIZE_8K;

        write_barrier();

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

/** @}
 */