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 #include <asm-generic/pgalloc.h>
  18
  19 #define PGD_SIZE        (PTRS_PER_PGD * sizeof(pgd_t))
  20
  21 #if CONFIG_PGTABLE_LEVELS > 2
  22
  23 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  24 {
  25         set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
  26 }
  27
  28 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
  29 {
  30         __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
  31 }
  32 #else
  33 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  34 {
  35         BUILD_BUG();
  36 }
  37 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  38
  39 #if CONFIG_PGTABLE_LEVELS > 3
  40
  41 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  42 {
  43         set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
  44 }
  45
  46 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
  47 {
  48         __p4d_populate(p4dp, __pa(pudp), PUD_TYPE_TABLE);
  49 }
  50 #else
  51 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  52 {
  53         BUILD_BUG();
  54 }
  55 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  56
  57 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  58 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
  59
  60 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
  61                                   pmdval_t prot)
  62 {
  63         set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
  64 }
  65
  66 /*
  67  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  68  * of the mm address space.
  69  */
  70 static inline void
  71 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
  72 {
  73         /*
  74          * The pmd must be loaded with the physical address of the PTE table
  75          */
  76         __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
  77 }
  78
  79 static inline void
  80 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
  81 {
  82         __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
  83 }
  84 #define pmd_pgtable(pmd) pmd_page(pmd)
  85
  86 #endif