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         struct page *pte)
  24 {
  25         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  26 }
  27
  28 /*
  29  * Initialize a new pmd table with invalid pointers.
  30  */
  31 extern void pmd_init(unsigned long page, unsigned long pagetable);
  32
  33 #ifdef CONFIG_64BIT
  34
  35 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  36 {
  37         set_pud(pud, __pud((unsigned long)pmd));
  38 }
  39 #endif
  40
  41 /*
  42  * Initialize a new pgd / pmd table with invalid pointers.
  43  */
  44 extern void pgd_init(unsigned long page);
  45
  46 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  47 {
  48         pgd_t *ret, *init;
  49
  50         ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  51         if (ret) {
  52                 init = pgd_offset(&init_mm, 0UL);
  53                 pgd_init((unsigned long)ret);
  54                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  55                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  56         }
  57
  58         return ret;
  59 }
  60
  61 static inline void pgd_free(pgd_t *pgd)
  62 {
  63         free_pages((unsigned long)pgd, PGD_ORDER);
  64 }
  65
  66 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  67         unsigned long address)
  68 {
  69         pte_t *pte;
  70
  71         pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
  72
  73         return pte;
  74 }
  75
  76 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  77         unsigned long address)
  78 {
  79         struct page *pte;
  80
  81         pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
  82         if (pte)
  83                 clear_highpage(pte);
  84
  85         return pte;
  86 }
  87
  88 static inline void pte_free_kernel(pte_t *pte)
  89 {
  90         free_pages((unsigned long)pte, PTE_ORDER);
  91 }
  92
  93 static inline void pte_free(struct page *pte)
  94 {
  95         __free_pages(pte, PTE_ORDER);
  96 }
  97
  98 #define __pte_free_tlb(tlb, pte)        tlb_remove_page((tlb), (pte))
  99
 100 #ifdef CONFIG_32BIT
 101
 102 /*
 103  * allocating and freeing a pmd is trivial: the 1-entry pmd is
 104  * inside the pgd, so has no extra memory associated with it.
 105  */
 106 #define pmd_free(x)                     do { } while (0)
 107 #define __pmd_free_tlb(tlb, x)          do { } while (0)
 108
 109 #endif
 110
 111 #ifdef CONFIG_64BIT
 112
 113 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 114 {
 115         pmd_t *pmd;
 116
 117         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
 118         if (pmd)
 119                 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 120         return pmd;
 121 }
 122
 123 static inline void pmd_free(pmd_t *pmd)
 124 {
 125         free_pages((unsigned long)pmd, PMD_ORDER);
 126 }
 127
 128 #define __pmd_free_tlb(tlb, x)  pmd_free(x)
 129
 130 #endif
 131
 132 #define check_pgt_cache()       do { } while (0)
 133
 134 extern void pagetable_init(void);
 135
 136 #endif /* _ASM_PGALLOC_H */