LXR linux/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
  31static 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
  36static 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
  42static 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
  49extern pgd_t *pgd_alloc(struct mm_struct *mm);
  50extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  51
  52#define PGALLOC_GFP     (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
  53
  54static inline pte_t *
  55pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
  56{
  57        return (pte_t *)__get_free_page(PGALLOC_GFP);
  58}
  59
  60static inline pgtable_t
  61pte_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                pgtable_page_ctor(pte);
  68
  69        return pte;
  70}
  71
  72/*
  73 * Free a PTE table.
  74 */
  75static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  76{
  77        if (pte)
  78                free_page((unsigned long)pte);
  79}
  80
  81static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  82{
  83        pgtable_page_dtor(pte);
  84        __free_page(pte);
  85}
  86
  87static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
  88                                  pmdval_t prot)
  89{
  90        set_pmd(pmdp, __pmd(pte | prot));
  91}
  92
  93/*
  94 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  95 * of the mm address space.
  96 */
  97static inline void
  98pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
  99{
 100        /*
 101         * The pmd must be loaded with the physical address of the PTE table
 102         */
 103        __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
 104}
 105
 106static inline void
 107pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 108{
 109        __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
 110}
 111#define pmd_pgtable(pmd) pmd_page(pmd)
 112
 113#endif
 114