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
  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 #ifndef __PAGETABLE_PMD_FOLDED
  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_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, PTE_ORDER);
  83         if (!pte)
  84                 return NULL;
  85         clear_highpage(pte);
  86         if (!pgtable_page_ctor(pte)) {
  87                 __free_page(pte);
  88                 return NULL;
  89         }
  90         return pte;
  91 }
  92
  93 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  94 {
  95         free_pages((unsigned long)pte, PTE_ORDER);
  96 }
  97
  98 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  99 {
 100         pgtable_page_dtor(pte);
 101         __free_pages(pte, PTE_ORDER);
 102 }
 103
 104 #define __pte_free_tlb(tlb,pte,address)                 \
 105 do {                                                    \
 106         pgtable_page_dtor(pte);                         \
 107         tlb_remove_page((tlb), pte);                    \
 108 } while (0)
 109
 110 #ifndef __PAGETABLE_PMD_FOLDED
 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, 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(struct mm_struct *mm, pmd_t *pmd)
 123 {
 124         free_pages((unsigned long)pmd, PMD_ORDER);
 125 }
 126
 127 #define __pmd_free_tlb(tlb, x, addr)    pmd_free((tlb)->mm, x)
 128
 129 #endif
 130
 131 #define check_pgt_cache()       do { } while (0)
 132
 133 extern void pagetable_init(void);
 134
 135 #endif /* _ASM_PGALLOC_H */