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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>
#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);

#ifdef CONFIG_64BIT

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)                       \
do {                                      \
      pgtable_page_dtor(pte);                   \
      tlb_remove_page((tlb), pte);              \
} while (0)

#ifdef CONFIG_32BIT

/*
 * 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_free(mm, x)             do { } while (0)
#define __pmd_free_tlb(tlb, x)            do { } while (0)

#endif

#ifdef CONFIG_64BIT

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)      pmd_free((tlb)->mm, x)

#endif

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

extern void pagetable_init(void);

#endif /* _ASM_PGALLOC_H */

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