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#define __HAVE_ARCH_PTE_ALLOC_ONE
  13#include <asm-generic/pgalloc.h>        /* for pte_{alloc,free}_one */
  14
  15/*
  16 * Since we have only two-level page tables, these are trivial
  17 */
  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
  23static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  24{
  25        pgtable_t pte;
  26
  27        pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
  28        if (pte)
  29                cpu_dcache_wb_page((unsigned long)page_address(pte));
  30
  31        return pte;
  32}
  33
  34/*
  35 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  36 * of the mm address space.
  37 *
  38 * Ensure that we always set both PMD entries.
  39 */
  40static inline void
  41pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
  42{
  43        unsigned long pte_ptr = (unsigned long)ptep;
  44        unsigned long pmdval;
  45
  46        BUG_ON(mm != &init_mm);
  47
  48        /*
  49         * The pmd must be loaded with the physical
  50         * address of the PTE table
  51         */
  52        pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
  53        set_pmd(pmdp, __pmd(pmdval));
  54}
  55
  56static inline void
  57pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
  58{
  59        unsigned long pmdval;
  60
  61        BUG_ON(mm == &init_mm);
  62
  63        pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
  64        set_pmd(pmdp, __pmd(pmdval));
  65}
  66
  67#endif
  68