include/asm-mips/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
  15 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  16         pte_t *pte)
  17 {
  18         set_pmd(pmd, __pmd((unsigned long)pte));
  19 }
  20
  21 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  22         struct page *pte)
  23 {
  24         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  25 }
  26
  27 /*
  28  * Initialize a new pmd table with invalid pointers.
  29  */
  30 extern void pmd_init(unsigned long page, unsigned long pagetable);
  31
  32 #ifdef CONFIG_64BIT
  33
  34 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  35 {
  36         set_pud(pud, __pud((unsigned long)pmd));
  37 }
  38 #endif
  39
  40 /*
  41  * Initialize a new pgd / pmd table with invalid pointers.
  42  */
  43 extern void pgd_init(unsigned long page);
  44
  45 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  46 {
  47         pgd_t *ret, *init;
  48
  49         ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  50         if (ret) {
  51                 init = pgd_offset(&init_mm, 0);
  52                 pgd_init((unsigned long)ret);
  53                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  54                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  55         }
  56
  57         return ret;
  58 }
  59
  60 static inline void pgd_free(pgd_t *pgd)
  61 {
  62         free_pages((unsigned long)pgd, PGD_ORDER);
  63 }
  64
  65 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  66         unsigned long address)
  67 {
  68         pte_t *pte;
  69
  70         pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
  71
  72         return pte;
  73 }
  74
  75 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  76         unsigned long address)
  77 {
  78         struct page *pte;
  79
  80         pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
  81         if (pte)
  82                 clear_highpage(pte);
  83
  84         return pte;
  85 }
  86
  87 static inline void pte_free_kernel(pte_t *pte)
  88 {
  89         free_pages((unsigned long)pte, PTE_ORDER);
  90 }
  91
  92 static inline void pte_free(struct page *pte)
  93 {
  94         __free_pages(pte, PTE_ORDER);
  95 }
  96
  97 #define __pte_free_tlb(tlb,pte)         tlb_remove_page((tlb),(pte))
  98
  99 #ifdef CONFIG_32BIT
 100
 101 /*
 102  * allocating and freeing a pmd is trivial: the 1-entry pmd is
 103  * inside the pgd, so has no extra memory associated with it.
 104  */
 105 #define pmd_free(x)                     do { } while (0)
 106 #define __pmd_free_tlb(tlb,x)           do { } while (0)
 107
 108 #endif
 109
 110 #ifdef CONFIG_64BIT
 111
 112 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 113 {
 114         pmd_t *pmd;
 115
 116         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
 117         if (pmd)
 118                 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 119         return pmd;
 120 }
 121
 122 static inline void pmd_free(pmd_t *pmd)
 123 {
 124         free_pages((unsigned long)pmd, PMD_ORDER);
 125 }
 126
 127 #define __pmd_free_tlb(tlb,x)   pmd_free(x)
 128
 129 #endif
 130
 131 #define check_pgt_cache()       do { } while (0)
 132
 133 #endif /* _ASM_PGALLOC_H */