linux/arch/mips/include/asm/pgalloc.h
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   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
   7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8 */
   9#ifndef _ASM_PGALLOC_H
  10#define _ASM_PGALLOC_H
  11
  12#include <linux/highmem.h>
  13#include <linux/mm.h>
  14#include <linux/sched.h>
  15
  16static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  17        pte_t *pte)
  18{
  19        set_pmd(pmd, __pmd((unsigned long)pte));
  20}
  21
  22static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  23        pgtable_t pte)
  24{
  25        set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  26}
  27#define pmd_pgtable(pmd) pmd_page(pmd)
  28
  29/*
  30 * Initialize a new pmd table with invalid pointers.
  31 */
  32extern void pmd_init(unsigned long page, unsigned long pagetable);
  33
  34#ifdef CONFIG_64BIT
  35
  36static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  37{
  38        set_pud(pud, __pud((unsigned long)pmd));
  39}
  40#endif
  41
  42/*
  43 * Initialize a new pgd / pmd table with invalid pointers.
  44 */
  45extern void pgd_init(unsigned long page);
  46
  47static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  48{
  49        pgd_t *ret, *init;
  50
  51        ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  52        if (ret) {
  53                init = pgd_offset(&init_mm, 0UL);
  54                pgd_init((unsigned long)ret);
  55                memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  56                       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  57        }
  58
  59        return ret;
  60}
  61
  62static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  63{
  64        free_pages((unsigned long)pgd, PGD_ORDER);
  65}
  66
  67static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  68        unsigned long address)
  69{
  70        pte_t *pte;
  71
  72        pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
  73
  74        return pte;
  75}
  76
  77static inline struct page *pte_alloc_one(struct mm_struct *mm,
  78        unsigned long address)
  79{
  80        struct page *pte;
  81
  82        pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
  83        if (pte) {
  84                clear_highpage(pte);
  85                pgtable_page_ctor(pte);
  86        }
  87        return pte;
  88}
  89
  90static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  91{
  92        free_pages((unsigned long)pte, PTE_ORDER);
  93}
  94
  95static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  96{
  97        pgtable_page_dtor(pte);
  98        __free_pages(pte, PTE_ORDER);
  99}
 100
 101#define __pte_free_tlb(tlb,pte)                         \
 102do {                                                    \
 103        pgtable_page_dtor(pte);                         \
 104        tlb_remove_page((tlb), pte);                    \
 105} while (0)
 106
 107#ifdef CONFIG_32BIT
 108
 109/*
 110 * allocating and freeing a pmd is trivial: the 1-entry pmd is
 111 * inside the pgd, so has no extra memory associated with it.
 112 */
 113#define pmd_free(mm, x)                 do { } while (0)
 114#define __pmd_free_tlb(tlb, x)          do { } while (0)
 115
 116#endif
 117
 118#ifdef CONFIG_64BIT
 119
 120static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 121{
 122        pmd_t *pmd;
 123
 124        pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
 125        if (pmd)
 126                pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 127        return pmd;
 128}
 129
 130static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 131{
 132        free_pages((unsigned long)pmd, PMD_ORDER);
 133}
 134
 135#define __pmd_free_tlb(tlb, x)  pmd_free((tlb)->mm, x)
 136
 137#endif
 138
 139#define check_pgt_cache()       do { } while (0)
 140
 141extern void pagetable_init(void);
 142
 143#endif /* _ASM_PGALLOC_H */
 144
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