LXR linux/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
  20static 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
  30static 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
  38static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  39{
  40        free_page((unsigned long)pgd);
  41}
  42
  43static 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
  50static 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
  64static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  65{
  66        free_page((unsigned long)pte);
  67}
  68
  69static 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
  84