arch/arm64/include/asm/pgalloc.h

   1 /*
   2  * Based on arch/arm/include/asm/pgalloc.h
   3  *
   4  * Copyright (C) 2000-2001 Russell King
   5  * Copyright (C) 2012 ARM Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #ifndef __ASM_PGALLOC_H
  20 #define __ASM_PGALLOC_H
  21
  22 #include <asm/pgtable-hwdef.h>
  23 #include <asm/processor.h>
  24 #include <asm/cacheflush.h>
  25 #include <asm/tlbflush.h>
  26
  27 #define check_pgt_cache()               do { } while (0)
  28
  29 #define PGALLOC_GFP     (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
  30
  31 #if CONFIG_PGTABLE_LEVELS > 2
  32
  33 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  34 {
  35         return (pmd_t *)__get_free_page(PGALLOC_GFP);
  36 }
  37
  38 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  39 {
  40         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  41         free_page((unsigned long)pmd);
  42 }
  43
  44 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  45 {
  46         set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
  47 }
  48
  49 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  50
  51 #if CONFIG_PGTABLE_LEVELS > 3
  52
  53 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  54 {
  55         return (pud_t *)__get_free_page(PGALLOC_GFP);
  56 }
  57
  58 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  59 {
  60         BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
  61         free_page((unsigned long)pud);
  62 }
  63
  64 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
  65 {
  66         set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
  67 }
  68
  69 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  70
  71 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  72 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  73
  74 static inline pte_t *
  75 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
  76 {
  77         return (pte_t *)__get_free_page(PGALLOC_GFP);
  78 }
  79
  80 static inline pgtable_t
  81 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
  82 {
  83         struct page *pte;
  84
  85         pte = alloc_pages(PGALLOC_GFP, 0);
  86         if (!pte)
  87                 return NULL;
  88         if (!pgtable_page_ctor(pte)) {
  89                 __free_page(pte);
  90                 return NULL;
  91         }
  92         return pte;
  93 }
  94
  95 /*
  96  * Free a PTE table.
  97  */
  98 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  99 {
 100         if (pte)
 101                 free_page((unsigned long)pte);
 102 }
 103
 104 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 105 {
 106         pgtable_page_dtor(pte);
 107         __free_page(pte);
 108 }
 109
 110 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
 111                                   pmdval_t prot)
 112 {
 113         set_pmd(pmdp, __pmd(pte | prot));
 114 }
 115
 116 /*
 117  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 118  * of the mm address space.
 119  */
 120 static inline void
 121 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 122 {
 123         /*
 124          * The pmd must be loaded with the physical address of the PTE table
 125          */
 126         __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
 127 }
 128
 129 static inline void
 130 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 131 {
 132         __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
 133 }
 134 #define pmd_pgtable(pmd) pmd_page(pmd)
 135
 136 #endif