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_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 *pmdp)
  40 {
  41         BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
  42         free_page((unsigned long)pmdp);
  43 }
  44
  45 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  46 {
  47         set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
  48 }
  49
  50 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
  51 {
  52         __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
  53 }
  54 #else
  55 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  56 {
  57         BUILD_BUG();
  58 }
  59 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  60
  61 #if CONFIG_PGTABLE_LEVELS > 3
  62
  63 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  64 {
  65         return (pud_t *)__get_free_page(PGALLOC_GFP);
  66 }
  67
  68 static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
  69 {
  70         BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
  71         free_page((unsigned long)pudp);
  72 }
  73
  74 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
  75 {
  76         set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
  77 }
  78
  79 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
  80 {
  81         __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
  82 }
  83 #else
  84 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
  85 {
  86         BUILD_BUG();
  87 }
  88 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  89
  90 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  91 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
  92
  93 static inline pte_t *
  94 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
  95 {
  96         return (pte_t *)__get_free_page(PGALLOC_GFP);
  97 }
  98
  99 static inline pgtable_t
 100 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 101 {
 102         struct page *pte;
 103
 104         pte = alloc_pages(PGALLOC_GFP, 0);
 105         if (!pte)
 106                 return NULL;
 107         if (!pgtable_page_ctor(pte)) {
 108                 __free_page(pte);
 109                 return NULL;
 110         }
 111         return pte;
 112 }
 113
 114 /*
 115  * Free a PTE table.
 116  */
 117 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *ptep)
 118 {
 119         if (ptep)
 120                 free_page((unsigned long)ptep);
 121 }
 122
 123 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 124 {
 125         pgtable_page_dtor(pte);
 126         __free_page(pte);
 127 }
 128
 129 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
 130                                   pmdval_t prot)
 131 {
 132         set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
 133 }
 134
 135 /*
 136  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 137  * of the mm address space.
 138  */
 139 static inline void
 140 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 141 {
 142         /*
 143          * The pmd must be loaded with the physical address of the PTE table
 144          */
 145         __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
 146 }
 147
 148 static inline void
 149 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 150 {
 151         __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
 152 }
 153 #define pmd_pgtable(pmd) pmd_page(pmd)
 154
 155 #endif