arch/metag/include/asm/pgalloc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _METAG_PGALLOC_H
   3 #define _METAG_PGALLOC_H
   4
   5 #include <linux/threads.h>
   6 #include <linux/mm.h>
   7
   8 #define pmd_populate_kernel(mm, pmd, pte) \
   9         set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
  10
  11 #define pmd_populate(mm, pmd, pte) \
  12         set_pmd(pmd, __pmd(_PAGE_TABLE | page_to_phys(pte)))
  13
  14 #define pmd_pgtable(pmd) pmd_page(pmd)
  15
  16 /*
  17  * Allocate and free page tables.
  18  */
  19 #ifdef CONFIG_METAG_META21_MMU
  20 static inline void pgd_ctor(pgd_t *pgd)
  21 {
  22         memcpy(pgd + USER_PTRS_PER_PGD,
  23                swapper_pg_dir + USER_PTRS_PER_PGD,
  24                (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  25 }
  26 #else
  27 #define pgd_ctor(x)     do { } while (0)
  28 #endif
  29
  30 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  31 {
  32         pgd_t *pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  33         if (pgd)
  34                 pgd_ctor(pgd);
  35         return pgd;
  36 }
  37
  38 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  39 {
  40         free_page((unsigned long)pgd);
  41 }
  42
  43 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  44                                           unsigned long address)
  45 {
  46         pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
  47         return pte;
  48 }
  49
  50 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  51                                       unsigned long address)
  52 {
  53         struct page *pte;
  54         pte = alloc_pages(GFP_KERNEL  | __GFP_ZERO, 0);
  55         if (!pte)
  56                 return NULL;
  57         if (!pgtable_page_ctor(pte)) {
  58                 __free_page(pte);
  59                 return NULL;
  60         }
  61         return pte;
  62 }
  63
  64 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  65 {
  66         free_page((unsigned long)pte);
  67 }
  68
  69 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  70 {
  71         pgtable_page_dtor(pte);
  72         __free_page(pte);
  73 }
  74
  75 #define __pte_free_tlb(tlb, pte, addr)                          \
  76         do {                                                    \
  77                 pgtable_page_dtor(pte);                         \
  78                 tlb_remove_page((tlb), (pte));                  \
  79         } while (0)
  80
  81 #define check_pgt_cache()       do { } while (0)
  82
  83 #endif