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 #define PGD_SIZE        (PTRS_PER_PGD * sizeof(pgd_t))
  31
  32 #if CONFIG_PGTABLE_LEVELS > 2
  33
  34 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  35 {
  36         return (pmd_t *)__get_free_page(PGALLOC_GFP);
  37 }
  38
  39 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  40 {
  41         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  42         free_page((unsigned long)pmd);
  43 }
  44
  45 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  46 {
  47         set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
  48 }
  49
  50 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  51
  52 #if CONFIG_PGTABLE_LEVELS > 3
  53
  54 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  55 {
  56         return (pud_t *)__get_free_page(PGALLOC_GFP);
  57 }
  58
  59 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  60 {
  61         BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
  62         free_page((unsigned long)pud);
  63 }
  64
  65 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
  66 {
  67         set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
  68 }
  69
  70 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  71
  72 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  73 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  74
  75 static inline pte_t *
  76 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
  77 {
  78         return (pte_t *)__get_free_page(PGALLOC_GFP);
  79 }
  80
  81 static inline pgtable_t
  82 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
  83 {
  84         struct page *pte;
  85
  86         pte = alloc_pages(PGALLOC_GFP, 0);
  87         if (!pte)
  88                 return NULL;
  89         if (!pgtable_page_ctor(pte)) {
  90                 __free_page(pte);
  91                 return NULL;
  92         }
  93         return pte;
  94 }
  95
  96 /*
  97  * Free a PTE table.
  98  */
  99 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 100 {
 101         if (pte)
 102                 free_page((unsigned long)pte);
 103 }
 104
 105 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 106 {
 107         pgtable_page_dtor(pte);
 108         __free_page(pte);
 109 }
 110
 111 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
 112                                   pmdval_t prot)
 113 {
 114         set_pmd(pmdp, __pmd(pte | prot));
 115 }
 116
 117 /*
 118  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 119  * of the mm address space.
 120  */
 121 static inline void
 122 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 123 {
 124         /*
 125          * The pmd must be loaded with the physical address of the PTE table
 126          */
 127         __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
 128 }
 129
 130 static inline void
 131 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 132 {
 133         __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
 134 }
 135 #define pmd_pgtable(pmd) pmd_page(pmd)
 136
 137 #endif