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
  20 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  21 extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
  22
  23 #define check_pgt_cache()               do { } while (0)
  24
  25 static 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
  37 static 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  */
  51 static 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
  58 static 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  */
  69 static inline void
  70 pmd_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
  85 static inline void
  86 pmd_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