arch/arm64/include/asm/pgalloc.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Based on arch/arm/include/asm/pgalloc.h
   4  *
   5  * Copyright (C) 2000-2001 Russell King
   6  * Copyright (C) 2012 ARM Ltd.
   7  */
   8 #ifndef __ASM_PGALLOC_H
   9 #define __ASM_PGALLOC_H
  10
  11 #include <asm/pgtable-hwdef.h>
  12 #include <asm/processor.h>
  13 #include <asm/cacheflush.h>
  14 #include <asm/tlbflush.h>
  15
  16 #include <asm-generic/pgalloc.h>        /* for pte_{alloc,free}_one */
  17
  18 #define check_pgt_cache()               do { } while (0)
  19
  20 #define PGD_SIZE        (PTRS_PER_PGD * sizeof(pgd_t))
  21
  22 #if CONFIG_PGTABLE_LEVELS > 2
  23
  24 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  25 {
  26         gfp_t gfp = GFP_PGTABLE_USER;
  27         struct page *page;
  28
  29         if (mm == &init_mm)
  30                 gfp = GFP_PGTABLE_KERNEL;
  31
  32         page = alloc_page(gfp);
  33         if (!page)
  34                 return NULL;
  35         if (!pgtable_pmd_page_ctor(page)) {
  36                 __free_page(page);
  37                 return NULL;
  38         }
  39         return page_address(page);
  40 }
  41
  42 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
  43 {
  44         BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
  45         pgtable_pmd_page_dtor(virt_to_page(pmdp));
  46         free_page((unsigned long)pmdp);
  47 }
  48
  49 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  50 {
  51         set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
  52 }
  53
  54 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
  55 {
  56         __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
  57 }
  58 #else
  59 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  60 {
  61         BUILD_BUG();
  62 }
  63 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  64
  65 #if CONFIG_PGTABLE_LEVELS > 3
  66
  67 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  68 {
  69         return (pud_t *)__get_free_page(GFP_PGTABLE_USER);
  70 }
  71
  72 static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
  73 {
  74         BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
  75         free_page((unsigned long)pudp);
  76 }
  77
  78 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
  79 {
  80         set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
  81 }
  82
  83 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
  84 {
  85         __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
  86 }
  87 #else
  88 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
  89 {
  90         BUILD_BUG();
  91 }
  92 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  93
  94 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  95 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
  96
  97 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
  98                                   pmdval_t prot)
  99 {
 100         set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
 101 }
 102
 103 /*
 104  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 105  * of the mm address space.
 106  */
 107 static inline void
 108 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 109 {
 110         /*
 111          * The pmd must be loaded with the physical address of the PTE table
 112          */
 113         __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
 114 }
 115
 116 static inline void
 117 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 118 {
 119         __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
 120 }
 121 #define pmd_pgtable(pmd) pmd_page(pmd)
 122
 123 #endif