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 #ifndef CONFIG_ARM64_64K_PAGES
  30
  31 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  32 {
  33         return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
  34 }
  35
  36 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  37 {
  38         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  39         free_page((unsigned long)pmd);
  40 }
  41
  42 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  43 {
  44         set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
  45 }
  46
  47 #endif  /* CONFIG_ARM64_64K_PAGES */
  48
  49 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  50 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  51
  52 #define PGALLOC_GFP     (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
  53
  54 static inline pte_t *
  55 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
  56 {
  57         return (pte_t *)__get_free_page(PGALLOC_GFP);
  58 }
  59
  60 static inline pgtable_t
  61 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
  62 {
  63         struct page *pte;
  64
  65         pte = alloc_pages(PGALLOC_GFP, 0);
  66         if (!pte)
  67                 return NULL;
  68         if (!pgtable_page_ctor(pte)) {
  69                 __free_page(pte);
  70                 return NULL;
  71         }
  72         return pte;
  73 }
  74
  75 /*
  76  * Free a PTE table.
  77  */
  78 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  79 {
  80         if (pte)
  81                 free_page((unsigned long)pte);
  82 }
  83
  84 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  85 {
  86         pgtable_page_dtor(pte);
  87         __free_page(pte);
  88 }
  89
  90 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
  91                                   pmdval_t prot)
  92 {
  93         set_pmd(pmdp, __pmd(pte | prot));
  94 }
  95
  96 /*
  97  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  98  * of the mm address space.
  99  */
 100 static inline void
 101 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 102 {
 103         /*
 104          * The pmd must be loaded with the physical address of the PTE table
 105          */
 106         __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
 107 }
 108
 109 static inline void
 110 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 111 {
 112         __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
 113 }
 114 #define pmd_pgtable(pmd) pmd_page(pmd)
 115
 116 #endif