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/config.h>
  13 #include <linux/highmem.h>
  14 #include <linux/mm.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         struct page *pte)
  24 {
  25         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  26 }
  27
  28 /*
  29  * Initialize a new pgd / pmd table with invalid pointers.
  30  */
  31 extern void pgd_init(unsigned long page);
  32 extern void pmd_init(unsigned long page, unsigned long pagetable);
  33
  34 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  35 {
  36         pgd_t *ret, *init;
  37
  38         ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  39         if (ret) {
  40                 init = pgd_offset(&init_mm, 0);
  41                 pgd_init((unsigned long)ret);
  42                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  43                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  44         }
  45
  46         return ret;
  47 }
  48
  49 static inline void pgd_free(pgd_t *pgd)
  50 {
  51         free_pages((unsigned long)pgd, PGD_ORDER);
  52 }
  53
  54 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  55         unsigned long address)
  56 {
  57         pte_t *pte;
  58
  59         pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
  60
  61         return pte;
  62 }
  63
  64 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  65         unsigned long address)
  66 {
  67         struct page *pte;
  68
  69         pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
  70         if (pte)
  71                 clear_highpage(pte);
  72
  73         return pte;
  74 }
  75
  76 static inline void pte_free_kernel(pte_t *pte)
  77 {
  78         free_pages((unsigned long)pte, PTE_ORDER);
  79 }
  80
  81 static inline void pte_free(struct page *pte)
  82 {
  83         __free_pages(pte, PTE_ORDER);
  84 }
  85
  86 #define __pte_free_tlb(tlb,pte)         tlb_remove_page((tlb),(pte))
  87
  88 #ifdef CONFIG_32BIT
  89 #define pgd_populate(mm, pmd, pte)      BUG()
  90
  91 /*
  92  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  93  * inside the pgd, so has no extra memory associated with it.
  94  */
  95 #define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
  96 #define pmd_free(x)                     do { } while (0)
  97 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  98 #endif
  99
 100 #ifdef CONFIG_64BIT
 101
 102 #define pgd_populate(mm, pgd, pmd)      set_pgd(pgd, __pgd(pmd))
 103
 104 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 105 {
 106         pmd_t *pmd;
 107
 108         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
 109         if (pmd)
 110                 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 111         return pmd;
 112 }
 113
 114 static inline void pmd_free(pmd_t *pmd)
 115 {
 116         free_pages((unsigned long)pmd, PMD_ORDER);
 117 }
 118
 119 #define __pmd_free_tlb(tlb,x)   pmd_free(x)
 120
 121 #endif
 122
 123 #define check_pgt_cache()       do { } while (0)
 124
 125 #endif /* _ASM_PGALLOC_H */