as.c

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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/mm/as.h>
#include <arch/mm/asid.h>
#include <arch/mm/page.h>
#include <genarch/mm/as_ht.h>
#include <genarch/mm/asid_fifo.h>
#include <mm/asid.h>
#include <arch.h>
#include <arch/barrier.h>
#include <synch/spinlock.h>

void as_arch_init(void)
{
        as_operations = &as_ht_operations;
        asid_fifo_init();
}

void as_install_arch(as_t *as)
{
        ipl_t ipl;
        region_register rr;
        int i;
        
        ipl = interrupts_disable();
        spinlock_lock(&as->lock);
        
        ASSERT(as->asid != ASID_INVALID);
        
        /*
         * Load respective ASID (7 consecutive RIDs) to
         * region registers.
         */
        for (i = 0; i < REGION_REGISTERS; i++) {
                if (i == VRN_KERNEL)
                        continue;
                
                rr.word = rr_read(i);
                rr.map.ve = false;                      /* disable VHPT walker */
                rr.map.rid = ASID2RID(as->asid, i);
                rr.map.ps = PAGE_WIDTH;
                rr_write(i, rr.word);
        }
        srlz_d();
        srlz_i();
        
        spinlock_unlock(&as->lock);
        interrupts_restore(ipl);
}

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