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 #include <linux/sched.h>
  15
  16 static 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
  22 static 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  */
  32 extern void pmd_init(unsigned long page, unsigned long pagetable);
  33
  34 #ifdef CONFIG_64BIT
  35
  36 static 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  */
  45 extern void pgd_init(unsigned long page);
  46
  47 static 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
  62 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  63 {
  64         free_pages((unsigned long)pgd, PGD_ORDER);
  65 }
  66
  67 static 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
  77 static 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
  86         return pte;
  87 }
  88
  89 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  90 {
  91         free_pages((unsigned long)pte, PTE_ORDER);
  92 }
  93
  94 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  95 {
  96         __free_pages(pte, PTE_ORDER);
  97 }
  98
  99 #define __pte_free_tlb(tlb, pte)        tlb_remove_page((tlb), (pte))
 100
 101 #ifdef CONFIG_32BIT
 102
 103 /*
 104  * allocating and freeing a pmd is trivial: the 1-entry pmd is
 105  * inside the pgd, so has no extra memory associated with it.
 106  */
 107 #define pmd_free(mm, x)                 do { } while (0)
 108 #define __pmd_free_tlb(tlb, x)          do { } while (0)
 109
 110 #endif
 111
 112 #ifdef CONFIG_64BIT
 113
 114 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 115 {
 116         pmd_t *pmd;
 117
 118         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
 119         if (pmd)
 120                 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 121         return pmd;
 122 }
 123
 124 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 125 {
 126         free_pages((unsigned long)pmd, PMD_ORDER);
 127 }
 128
 129 #define __pmd_free_tlb(tlb, x)  pmd_free((tlb)->mm, x)
 130
 131 #endif
 132
 133 #define check_pgt_cache()       do { } while (0)
 134
 135 extern void pagetable_init(void);
 136
 137 #endif /* _ASM_PGALLOC_H */