pgtable-64.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1999, 2000 by Silicon Graphics
 * Copyright (C) 2003 by Ralf Baechle
 */
#include <linux/init.h>
#include <linux/mm.h>
#include <asm/fixmap.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>

void pgd_init(unsigned long page)
{
    unsigned long *p, *end;
    unsigned long entry;

#ifdef __PAGETABLE_PMD_FOLDED
    entry = (unsigned long)invalid_pte_table;
#else
    entry = (unsigned long)invalid_pmd_table;
#endif

    p = (unsigned long *) page;
    end = p + PTRS_PER_PGD;

    do {
        p[0] = entry;
        p[1] = entry;
        p[2] = entry;
        p[3] = entry;
        p[4] = entry;
        p += 8;
        p[-3] = entry;
        p[-2] = entry;
        p[-1] = entry;
    } while (p != end);
}

#ifndef __PAGETABLE_PMD_FOLDED
void pmd_init(unsigned long addr, unsigned long pagetable)
{
    unsigned long *p, *end;

    p = (unsigned long *) addr;
    end = p + PTRS_PER_PMD;

    do {
        p[0] = pagetable;
        p[1] = pagetable;
        p[2] = pagetable;
        p[3] = pagetable;
        p[4] = pagetable;
        p += 8;
        p[-3] = pagetable;
        p[-2] = pagetable;
        p[-1] = pagetable;
    } while (p != end);
}
#endif

void __init pagetable_init(void)
{
    unsigned long vaddr;
    pgd_t *pgd_base;

    /* Initialize the entire pgd.  */
    pgd_init((unsigned long)swapper_pg_dir);
#ifndef __PAGETABLE_PMD_FOLDED
    pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
#endif
    pgd_base = swapper_pg_dir;
    /*
     * Fixed mappings:
     */
    vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
    fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
}