pgtable-32.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) 2003 by Ralf Baechle
 */
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>
#include <asm/fixmap.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>

void pgd_init(unsigned long page)
{
    unsigned long *p = (unsigned long *) page;
    int i;

    for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
        p[i + 0] = (unsigned long) invalid_pte_table;
        p[i + 1] = (unsigned long) invalid_pte_table;
        p[i + 2] = (unsigned long) invalid_pte_table;
        p[i + 3] = (unsigned long) invalid_pte_table;
        p[i + 4] = (unsigned long) invalid_pte_table;
        p[i + 5] = (unsigned long) invalid_pte_table;
        p[i + 6] = (unsigned long) invalid_pte_table;
        p[i + 7] = (unsigned long) invalid_pte_table;
    }
}

void __init pagetable_init(void)
{
    unsigned long vaddr;
    pgd_t *pgd_base;
#ifdef CONFIG_HIGHMEM
    pgd_t *pgd;
    pud_t *pud;
    pmd_t *pmd;
    pte_t *pte;
#endif

    /* Initialize the entire pgd.  */
    pgd_init((unsigned long)swapper_pg_dir);
    pgd_init((unsigned long)swapper_pg_dir
         + sizeof(pgd_t) * USER_PTRS_PER_PGD);

    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);

#ifdef CONFIG_HIGHMEM
    /*
     * Permanent kmaps:
     */
    vaddr = PKMAP_BASE;
    fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);

    pgd = swapper_pg_dir + __pgd_offset(vaddr);
    pud = pud_offset(pgd, vaddr);
    pmd = pmd_offset(pud, vaddr);
    pte = pte_offset_kernel(pmd, vaddr);
    pkmap_page_table = pte;
#endif
}