pgalloc.h

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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) 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>
#include <linux/mm.h>
#include <linux/sched.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,
    pgtable_t pte)
{
    set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
}
#define pmd_pgtable(pmd) pmd_page(pmd)

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

#ifndef __PAGETABLE_PMD_FOLDED

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
    set_pud(pud, __pud((unsigned long)pmd));
}
#endif

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

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, 0UL);
        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(struct mm_struct *mm, 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);
        pgtable_page_ctor(pte);
    }
    return pte;
}

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

static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
{
    pgtable_page_dtor(pte);
    __free_pages(pte, PTE_ORDER);
}

#define __pte_free_tlb(tlb,pte,address)         \
do {                            \
    pgtable_page_dtor(pte);             \
    tlb_remove_page((tlb), pte);            \
} while (0)

#ifndef __PAGETABLE_PMD_FOLDED

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(struct mm_struct *mm, pmd_t *pmd)
{
    free_pages((unsigned long)pmd, PMD_ORDER);
}

#define __pmd_free_tlb(tlb, x, addr)    pmd_free((tlb)->mm, x)

#endif

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

extern void pagetable_init(void);

#endif /* _ASM_PGALLOC_H */