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 #define __HAVE_ARCH_PGD_FREE
  17 #define __HAVE_ARCH_PUD_FREE
  18 #include <asm-generic/pgalloc.h>
  19
  20 #define PGD_SIZE        (PTRS_PER_PGD * sizeof(pgd_t))
  21
  22 #if CONFIG_PGTABLE_LEVELS > 2
  23
  24 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  25 {
  26         set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
  27 }
  28
  29 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
  30 {
  31         pudval_t pudval = PUD_TYPE_TABLE;
  32
  33         pudval |= (mm == &init_mm) ? PUD_TABLE_UXN : PUD_TABLE_PXN;
  34         __pud_populate(pudp, __pa(pmdp), pudval);
  35 }
  36 #else
  37 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  38 {
  39         BUILD_BUG();
  40 }
  41 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  42
  43 #if CONFIG_PGTABLE_LEVELS > 3
  44
  45 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  46 {
  47         if (pgtable_l4_enabled())
  48                 set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
  49 }
  50
  51 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
  52 {
  53         p4dval_t p4dval = P4D_TYPE_TABLE;
  54
  55         p4dval |= (mm == &init_mm) ? P4D_TABLE_UXN : P4D_TABLE_PXN;
  56         __p4d_populate(p4dp, __pa(pudp), p4dval);
  57 }
  58
  59 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  60 {
  61         if (!pgtable_l4_enabled())
  62                 return;
  63         __pud_free(mm, pud);
  64 }
  65 #else
  66 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  67 {
  68         BUILD_BUG();
  69 }
  70 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  71
  72 #if CONFIG_PGTABLE_LEVELS > 4
  73
  74 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
  75 {
  76         if (pgtable_l5_enabled())
  77                 set_pgd(pgdp, __pgd(__phys_to_pgd_val(p4dp) | prot));
  78 }
  79
  80 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, p4d_t *p4dp)
  81 {
  82         pgdval_t pgdval = PGD_TYPE_TABLE;
  83
  84         pgdval |= (mm == &init_mm) ? PGD_TABLE_UXN : PGD_TABLE_PXN;
  85         __pgd_populate(pgdp, __pa(p4dp), pgdval);
  86 }
  87
  88 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
  89 {
  90         gfp_t gfp = GFP_PGTABLE_USER;
  91
  92         if (mm == &init_mm)
  93                 gfp = GFP_PGTABLE_KERNEL;
  94         return (p4d_t *)get_zeroed_page(gfp);
  95 }
  96
  97 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
  98 {
  99         if (!pgtable_l5_enabled())
 100                 return;
 101         BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
 102         free_page((unsigned long)p4d);
 103 }
 104
 105 #define __p4d_free_tlb(tlb, p4d, addr)  p4d_free((tlb)->mm, p4d)
 106 #else
 107 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
 108 {
 109         BUILD_BUG();
 110 }
 111 #endif  /* CONFIG_PGTABLE_LEVELS > 4 */
 112
 113 extern pgd_t *pgd_alloc(struct mm_struct *mm);
 114 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
 115
 116 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
 117                                   pmdval_t prot)
 118 {
 119         set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
 120 }
 121
 122 /*
 123  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 124  * of the mm address space.
 125  */
 126 static inline void
 127 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 128 {
 129         VM_BUG_ON(mm && mm != &init_mm);
 130         __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE | PMD_TABLE_UXN);
 131 }
 132
 133 static inline void
 134 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 135 {
 136         VM_BUG_ON(mm == &init_mm);
 137         __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE | PMD_TABLE_PXN);
 138 }
 139
 140 #endif