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/*
 * Copyright (C) 2001-2004 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 <mm/page.h>
#include <mm/frame.h>
#include <arch/mm/page.h>
#include <arch/interrupt.h>
#include <arch/asm.h>
#include <config.h>

#include <memstr.h>


__address bootstrap_dba; 

void page_arch_init(void)
{
    __address dba;
    count_t i;

    if (config.cpu_active == 1) {
        dba = frame_alloc(FRAME_KA | FRAME_PANIC);
        memsetb(dba, PAGE_SIZE, 0);

        bootstrap_dba = dba;

        /*
         * Identity mapping for all frames.
         * PA2KA(identity) mapping for all frames.
         */
        for (i = 0; i < frames; i++) {
            map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE | PAGE_EXEC, KA2PA(dba));
        }

        trap_register(14, page_fault);
        write_cr3(KA2PA(dba));
    }
    else {
        /*
         * Application processors need to create their own view of the
         * virtual address space. Because of that, each AP copies
         * already-initialized paging information from the bootstrap
         * processor and adjusts it to fulfill its needs.
         */

        dba = frame_alloc(FRAME_KA | FRAME_PANIC);
        memcpy((void *)dba, (void *)bootstrap_dba , PAGE_SIZE);
        write_cr3(KA2PA(dba));
    }
}