LXR linux/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
  14static inline void
  15pmd_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
  21static inline void
  22pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  23{
  24        pmd_set(pmd, pte);
  25}
  26
  27static inline void
  28pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
  29{
  30        pgd_set(pgd, pmd);
  31}
  32
  33extern pgd_t *pgd_alloc(struct mm_struct *mm);
  34
  35static inline void
  36pgd_free(struct mm_struct *mm, pgd_t *pgd)
  37{
  38        free_page((unsigned long)pgd);
  39}
  40
  41static inline pmd_t *
  42pmd_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
  48static inline void
  49pmd_free(struct mm_struct *mm, pmd_t *pmd)
  50{
  51        free_page((unsigned long)pmd);
  52}
  53
  54static inline pte_t *
  55pte_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
  61static inline void
  62pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  63{
  64        free_page((unsigned long)pte);
  65}
  66
  67static inline pgtable_t
  68pte_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
  83static inline void
  84pte_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 */
  93