/*
 * 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/export.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <asm/fixmap.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>

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

#if !defined(__PAGETABLE_PUD_FOLDED)
        entry = (unsigned long)invalid_pud_table;
#elif !defined(__PAGETABLE_PMD_FOLDED)
        entry = (unsigned long)invalid_pmd_table;
#else
        entry = (unsigned long)invalid_pte_table;
#endif

        p = (unsigned long *) addr;
        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(void *addr)
{
        unsigned long *p, *end;
        unsigned long pagetable = (unsigned long)invalid_pte_table;

        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);
}
EXPORT_SYMBOL_GPL(pmd_init);
#endif

#ifndef __PAGETABLE_PUD_FOLDED
void pud_init(void *addr)
{
        unsigned long *p, *end;
        unsigned long pagetable = (unsigned long)invalid_pmd_table;

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

        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

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
                pmd_t *pmdp, pmd_t pmd)
{
        *pmdp = pmd;
}
#endif

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

        /* Initialize the entire pgd.  */
        pgd_init(swapper_pg_dir);
#ifndef __PAGETABLE_PUD_FOLDED
        pud_init(invalid_pud_table);
#endif
#ifndef __PAGETABLE_PMD_FOLDED
        pmd_init(invalid_pmd_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);
}