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{
  27        pte_t *pte;
  28
  29        pte =
  30            (pte_t *) __get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL |
  31                                      __GFP_ZERO);
  32
  33        return pte;
  34}
  35
  36static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  37{
  38        pgtable_t pte;
  39
  40        pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO, 0);
  41        if (pte)
  42                cpu_dcache_wb_page((unsigned long)page_address(pte));
  43
  44        return pte;
  45}
  46
  47/*
  48 * Free one PTE table.
  49 */
  50static inline void pte_free_kernel(struct mm_struct *mm, pte_t * pte)
  51{
  52        if (pte) {
  53                free_page((unsigned long)pte);
  54        }
  55}
  56
  57static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  58{
  59        __free_page(pte);
  60}
  61
  62/*
  63 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  64 * of the mm address space.
  65 *
  66 * Ensure that we always set both PMD entries.
  67 */
  68static inline void
  69pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
  70{
  71        unsigned long pte_ptr = (unsigned long)ptep;
  72        unsigned long pmdval;
  73
  74        BUG_ON(mm != &init_mm);
  75
  76        /*
  77         * The pmd must be loaded with the physical
  78         * address of the PTE table
  79         */
  80        pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
  81        set_pmd(pmdp, __pmd(pmdval));
  82}
  83
  84static inline void
  85pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
  86{
  87        unsigned long pmdval;
  88
  89        BUG_ON(mm == &init_mm);
  90
  91        pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
  92        set_pmd(pmdp, __pmd(pmdval));
  93}
  94
  95#endif
  96