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 <genarch/mm/as_pt.h>
#include <genarch/mm/asid_fifo.h>
#include <arch.h>

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

void as_install_arch(as_t *as)
{
        asid_t asid;
        ipl_t ipl;
        __u32 sr;

        ipl = interrupts_disable();
        spinlock_lock(&as->lock);
        
        asid = as->asid;
        
        /* Lower 2 GB, user and supervisor access */
        for (sr = 0; sr < 8; sr++) {
                asm volatile (
                        "mtsrin %0, %1\n"
                        :
                        : "r" ((0x6000 << 16) + (asid << 4) + sr), "r" (sr << 28)
                );
        }
        
        /* Upper 2 GB, only supervisor access */
        for (sr = 8; sr < 16; sr++) {
                asm volatile (
                        "mtsrin %0, %1\n"
                        :
                        : "r" ((0x4000 << 16) + (asid << 4) + sr), "r" (sr << 28)
                );
        }
        
        spinlock_unlock(&as->lock);
        interrupts_restore(ipl);
}

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