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
  20 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  21 extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
  22
  23 static 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  */
  40 static inline void
  41 pmd_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
  56 static inline void
  57 pmd_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