pgalloc.h

Go to the documentation of this file.

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_AVR32_PGALLOC_H
#define __ASM_AVR32_PGALLOC_H

#include <linux/mm.h>
#include <linux/quicklist.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#define QUICK_PGD   0   /* Preserve kernel mappings over free */
#define QUICK_PT    1   /* Zero on free */

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)

static inline void pgd_ctor(void *x)
{
    pgd_t *pgd = x;

    memcpy(pgd + USER_PTRS_PER_PGD,
        swapper_pg_dir + USER_PTRS_PER_PGD,
        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}

/*
 * Allocate and free page tables
 */
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
    return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
    quicklist_free(QUICK_PGD, NULL, pgd);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
                      unsigned long address)
{
    return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
}

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

    pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
    if (!pg)
        return NULL;

    page = virt_to_page(pg);
    pgtable_page_ctor(page);

    return page;
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
    quicklist_free(QUICK_PT, NULL, pte);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
{
    pgtable_page_dtor(pte);
    quicklist_free_page(QUICK_PT, NULL, pte);
}

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

static inline void check_pgt_cache(void)
{
    quicklist_trim(QUICK_PGD, NULL, 25, 16);
    quicklist_trim(QUICK_PT, NULL, 25, 16);
}

#endif /* __ASM_AVR32_PGALLOC_H */