LXR linux/arch/nds32/include/asm/pgalloc.h

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4#ifndef _ASMNDS32_PGALLOC_H
   5#define _ASMNDS32_PGALLOC_H
   6
   7#include <asm/processor.h>
   8#include <asm/cacheflush.h>
   9#include <asm/tlbflush.h>
  10#include <asm/proc-fns.h>
  11
  12/*
  13 * Since we have only two-level page tables, these are trivial
  14 */
  15#define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
  16#define pmd_free(mm, pmd)                       do { } while (0)
  17#define pgd_populate(mm, pmd, pte)      BUG()
  18#define pmd_pgtable(pmd) pmd_page(pmd)
  19
  20extern pgd_t *pgd_alloc(struct mm_struct *mm);
  21extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
  22
  23#define check_pgt_cache()               do { } while (0)
  24
  25static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  26                                          unsigned long addr)
  27{
  28        pte_t *pte;
  29
  30        pte =
  31            (pte_t *) __get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL |
  32                                      __GFP_ZERO);
  33
  34        return pte;
  35}
  36
  37static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr)
  38{
  39        pgtable_t pte;
  40
  41        pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO, 0);
  42        if (pte)
  43                cpu_dcache_wb_page((unsigned long)page_address(pte));
  44
  45        return pte;
  46}
  47
  48/*
  49 * Free one PTE table.
  50 */
  51static inline void pte_free_kernel(struct mm_struct *mm, pte_t * pte)
  52{
  53        if (pte) {
  54                free_page((unsigned long)pte);
  55        }
  56}
  57
  58static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  59{
  60        __free_page(pte);
  61}
  62
  63/*
  64 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  65 * of the mm address space.
  66 *
  67 * Ensure that we always set both PMD entries.
  68 */
  69static inline void
  70pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
  71{
  72        unsigned long pte_ptr = (unsigned long)ptep;
  73        unsigned long pmdval;
  74
  75        BUG_ON(mm != &init_mm);
  76
  77        /*
  78         * The pmd must be loaded with the physical
  79         * address of the PTE table
  80         */
  81        pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
  82        set_pmd(pmdp, __pmd(pmdval));
  83}
  84
  85static inline void
  86pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
  87{
  88        unsigned long pmdval;
  89
  90        BUG_ON(mm == &init_mm);
  91
  92        pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
  93        set_pmd(pmdp, __pmd(pmdval));
  94}
  95
  96#endif
  97