HelenOS sources

root/kernel/arch/ia64/src/mm/vhpt.c

DEFINITIONS

1. vhpt_set_up
2. vhpt_mapping_insert
3. vhpt_invalidate_all
4. vhpt_invalidate_asid

/*
 * Copyright (c) 2006 Jakub Vana
 * 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_ia64_mm
 * @{
 */
/** @file
 */

#include <memw.h>
#include <arch/barrier.h>
#include <arch/mm/vhpt.h>
#include <mm/frame.h>

static vhpt_entry_t *vhpt_base;

uintptr_t vhpt_set_up(void)
{
        uintptr_t vhpt_frame =
            frame_alloc(SIZE2FRAMES(VHPT_SIZE), FRAME_LOWMEM | FRAME_ATOMIC, 0);
        if (!vhpt_frame)
                panic("Kernel configured with VHPT but no memory for table.");

        vhpt_base = (vhpt_entry_t *) PA2KA(vhpt_frame);
        vhpt_invalidate_all();
        return (uintptr_t) vhpt_base;
}

void vhpt_mapping_insert(uintptr_t va, asid_t asid, tlb_entry_t entry)
{
        region_register_t rr_save, rr;
        size_t vrn;
        rid_t rid;
        uint64_t tag;

        vhpt_entry_t *ventry;

        vrn = va >> VRN_SHIFT;
        rid = ASID2RID(asid, vrn);

        rr_save.word = rr_read(vrn);
        rr.word = rr_save.word;
        rr.map.rid = rid;
        rr_write(vrn, rr.word);
        srlz_i();

        ventry = (vhpt_entry_t *) thash(va);
        tag = ttag(va);
        rr_write(vrn, rr_save.word);
        srlz_i();
        srlz_d();

        ventry->word[0] = entry.word[0];
        ventry->word[1] = entry.word[1];
        ventry->present.tag.tag_word = tag;
}

void vhpt_invalidate_all(void)
{
        memsetb(vhpt_base, VHPT_SIZE, 0);
}

void vhpt_invalidate_asid(asid_t asid)
{
        vhpt_invalidate_all();
}

/** @}
 */