LXR linux/arch/mips/include/asm/pgalloc.h

   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#ifndef __PAGETABLE_PMD_FOLDED
  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);
  46extern pgd_t *pgd_alloc(struct mm_struct *mm);
  47
  48static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  49{
  50        free_pages((unsigned long)pgd, PGD_ORDER);
  51}
  52
  53static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  54        unsigned long address)
  55{
  56        return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER);
  57}
  58
  59static inline struct page *pte_alloc_one(struct mm_struct *mm,
  60        unsigned long address)
  61{
  62        struct page *pte;
  63
  64        pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
  65        if (!pte)
  66                return NULL;
  67        clear_highpage(pte);
  68        if (!pgtable_page_ctor(pte)) {
  69                __free_page(pte);
  70                return NULL;
  71        }
  72        return pte;
  73}
  74
  75static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  76{
  77        free_pages((unsigned long)pte, PTE_ORDER);
  78}
  79
  80static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  81{
  82        pgtable_page_dtor(pte);
  83        __free_pages(pte, PTE_ORDER);
  84}
  85
  86#define __pte_free_tlb(tlb,pte,address)                 \
  87do {                                                    \
  88        pgtable_page_dtor(pte);                         \
  89        tlb_remove_page((tlb), pte);                    \
  90} while (0)
  91
  92#ifndef __PAGETABLE_PMD_FOLDED
  93
  94static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  95{
  96        pmd_t *pmd;
  97
  98        pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER);
  99        if (pmd)
 100                pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 101        return pmd;
 102}
 103
 104static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 105{
 106        free_pages((unsigned long)pmd, PMD_ORDER);
 107}
 108
 109#define __pmd_free_tlb(tlb, x, addr)    pmd_free((tlb)->mm, x)
 110
 111#endif
 112
 113#define check_pgt_cache()       do { } while (0)
 114
 115extern void pagetable_init(void);
 116
 117#endif /* _ASM_PGALLOC_H */
 118