LXR linux/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
  23static 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
  28static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
  29{
  30        pudval_t pudval = PUD_TYPE_TABLE;
  31
  32        pudval |= (mm == &init_mm) ? PUD_TABLE_UXN : PUD_TABLE_PXN;
  33        __pud_populate(pudp, __pa(pmdp), pudval);
  34}
  35#else
  36static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  37{
  38        BUILD_BUG();
  39}
  40#endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  41
  42#if CONFIG_PGTABLE_LEVELS > 3
  43
  44static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  45{
  46        set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
  47}
  48
  49static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
  50{
  51        p4dval_t p4dval = P4D_TYPE_TABLE;
  52
  53        p4dval |= (mm == &init_mm) ? P4D_TABLE_UXN : P4D_TABLE_PXN;
  54        __p4d_populate(p4dp, __pa(pudp), p4dval);
  55}
  56#else
  57static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  58{
  59        BUILD_BUG();
  60}
  61#endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  62
  63extern pgd_t *pgd_alloc(struct mm_struct *mm);
  64extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
  65
  66static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
  67                                  pmdval_t prot)
  68{
  69        set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
  70}
  71
  72/*
  73 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  74 * of the mm address space.
  75 */
  76static inline void
  77pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
  78{
  79        VM_BUG_ON(mm != &init_mm);
  80        __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE | PMD_TABLE_UXN);
  81}
  82
  83static inline void
  84pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
  85{
  86        VM_BUG_ON(mm == &init_mm);
  87        __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE | PMD_TABLE_PXN);
  88}
  89
  90#endif
  91