source: svn/trunk/newcon3bcm2_21bu/toolchain/mips-linux-uclibc/include/asm/pgalloc.h

/*
 * 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) 1994 - 2001, 2003 by Ralf Baechle
 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
 */
#ifndef _ASM_PGALLOC_H
#define _ASM_PGALLOC_H

#include <linux/highmem.h>

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
        pte_t *pte)
{
        set_pmd(pmd, __pmd((unsigned long)pte));
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
        struct page *pte)
{
        set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
}

/*
 * Initialize a new pgd / pmd table with invalid pointers.
 */
extern void pgd_init(unsigned long page);
extern void pmd_init(unsigned long page, unsigned long pagetable);

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
        pgd_t *ret, *init;

        ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
        if (ret) {
                init = pgd_offset(&init_mm, 0);
                pgd_init((unsigned long)ret);
                memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
                       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
        }

        return ret;
}

static inline void pgd_free(pgd_t *pgd)
{
        free_pages((unsigned long)pgd, PGD_ORDER);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
        unsigned long address)
{
        pte_t *pte;

        pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);

        return pte;
}

static inline struct page *pte_alloc_one(struct mm_struct *mm,
        unsigned long address)
{
        struct page *pte;

        pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
        if (pte)
                clear_highpage(pte);

        return pte;
}

static inline void pte_free_kernel(pte_t *pte)
{
        free_pages((unsigned long)pte, PTE_ORDER);
}

static inline void pte_free(struct page *pte)
{
        __free_pages(pte, PTE_ORDER);
}

#define __pte_free_tlb(tlb,pte)         tlb_remove_page((tlb),(pte))

#ifndef __mips64
#define pgd_populate(mm, pmd, pte)      BUG()

/*
 * allocating and freeing a pmd is trivial: the 1-entry pmd is
 * inside the pgd, so has no extra memory associated with it.
 */
#define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
#define pmd_free(x)                     do { } while (0)
#define __pmd_free_tlb(tlb,x)           do { } while (0)
#endif

#ifdef __mips64

#define pgd_populate(mm, pgd, pmd)      set_pgd(pgd, __pgd(pmd))

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
        pmd_t *pmd;

        pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
        if (pmd)
                pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
        return pmd;
}

static inline void pmd_free(pmd_t *pmd)
{
        free_pages((unsigned long)pmd, PMD_ORDER);
}

#define __pmd_free_tlb(tlb,x)   pmd_free(x)

#endif

#define check_pgt_cache()       do { } while (0)

#endif /* _ASM_PGALLOC_H */