arch/alpha/include/asm/pgalloc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ALPHA_PGALLOC_H
   3 #define _ALPHA_PGALLOC_H
   4
   5 #include <linux/mm.h>
   6 #include <linux/mmzone.h>
   7
   8 /*
   9  * Allocate and free page tables. The xxx_kernel() versions are
  10  * used to allocate a kernel page table - this turns on ASN bits
  11  * if any.
  12  */
  13
  14 static inline void
  15 pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte)
  16 {
  17         pmd_set(pmd, (pte_t *)(page_to_pa(pte) + PAGE_OFFSET));
  18 }
  19 #define pmd_pgtable(pmd) pmd_page(pmd)
  20
  21 static inline void
  22 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  23 {
  24         pmd_set(pmd, pte);
  25 }
  26
  27 static inline void
  28 pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
  29 {
  30         pgd_set(pgd, pmd);
  31 }
  32
  33 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  34
  35 static inline void
  36 pgd_free(struct mm_struct *mm, pgd_t *pgd)
  37 {
  38         free_page((unsigned long)pgd);
  39 }
  40
  41 static inline pmd_t *
  42 pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  43 {
  44         pmd_t *ret = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
  45         return ret;
  46 }
  47
  48 static inline void
  49 pmd_free(struct mm_struct *mm, pmd_t *pmd)
  50 {
  51         free_page((unsigned long)pmd);
  52 }
  53
  54 static inline pte_t *
  55 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
  56 {
  57         pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
  58         return pte;
  59 }
  60
  61 static inline void
  62 pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  63 {
  64         free_page((unsigned long)pte);
  65 }
  66
  67 static inline pgtable_t
  68 pte_alloc_one(struct mm_struct *mm, unsigned long address)
  69 {
  70         pte_t *pte = pte_alloc_one_kernel(mm, address);
  71         struct page *page;
  72
  73         if (!pte)
  74                 return NULL;
  75         page = virt_to_page(pte);
  76         if (!pgtable_page_ctor(page)) {
  77                 __free_page(page);
  78                 return NULL;
  79         }
  80         return page;
  81 }
  82
  83 static inline void
  84 pte_free(struct mm_struct *mm, pgtable_t page)
  85 {
  86         pgtable_page_dtor(page);
  87         __free_page(page);
  88 }
  89
  90 #define check_pgt_cache()       do { } while (0)
  91
  92 #endif /* _ALPHA_PGALLOC_H */