linux/arch/sh/mm/pgtable.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/mm.h>
   3#include <linux/slab.h>
   4
   5static struct kmem_cache *pgd_cachep;
   6#if PAGETABLE_LEVELS > 2
   7static struct kmem_cache *pmd_cachep;
   8#endif
   9
  10void pgd_ctor(void *x)
  11{
  12        pgd_t *pgd = x;
  13
  14        memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
  15        memcpy(pgd + USER_PTRS_PER_PGD,
  16               swapper_pg_dir + USER_PTRS_PER_PGD,
  17               (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  18}
  19
  20void pgtable_cache_init(void)
  21{
  22        pgd_cachep = kmem_cache_create("pgd_cache",
  23                                       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
  24                                       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
  25#if PAGETABLE_LEVELS > 2
  26        pmd_cachep = kmem_cache_create("pmd_cache",
  27                                       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
  28                                       PAGE_SIZE, SLAB_PANIC, NULL);
  29#endif
  30}
  31
  32pgd_t *pgd_alloc(struct mm_struct *mm)
  33{
  34        return kmem_cache_alloc(pgd_cachep, GFP_KERNEL);
  35}
  36
  37void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  38{
  39        kmem_cache_free(pgd_cachep, pgd);
  40}
  41
  42#if PAGETABLE_LEVELS > 2
  43void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  44{
  45        set_pud(pud, __pud((unsigned long)pmd));
  46}
  47
  48pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  49{
  50        return kmem_cache_alloc(pmd_cachep, GFP_KERNEL | __GFP_ZERO);
  51}
  52
  53void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  54{
  55        kmem_cache_free(pmd_cachep, pmd);
  56}
  57#endif /* PAGETABLE_LEVELS > 2 */
  58