LXR linux/arch/sh/mm/pgtable.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/mm.h>
   3#include <linux/slab.h>
   4
   5#define PGALLOC_GFP GFP_KERNEL | __GFP_ZERO
   6
   7static struct kmem_cache *pgd_cachep;
   8#if PAGETABLE_LEVELS > 2
   9static struct kmem_cache *pmd_cachep;
  10#endif
  11
  12void pgd_ctor(void *x)
  13{
  14        pgd_t *pgd = x;
  15
  16        memcpy(pgd + USER_PTRS_PER_PGD,
  17               swapper_pg_dir + USER_PTRS_PER_PGD,
  18               (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  19}
  20
  21void pgtable_cache_init(void)
  22{
  23        pgd_cachep = kmem_cache_create("pgd_cache",
  24                                       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
  25                                       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
  26#if PAGETABLE_LEVELS > 2
  27        pmd_cachep = kmem_cache_create("pmd_cache",
  28                                       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
  29                                       PAGE_SIZE, SLAB_PANIC, NULL);
  30#endif
  31}
  32
  33pgd_t *pgd_alloc(struct mm_struct *mm)
  34{
  35        return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
  36}
  37
  38void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  39{
  40        kmem_cache_free(pgd_cachep, pgd);
  41}
  42
  43#if PAGETABLE_LEVELS > 2
  44void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  45{
  46        set_pud(pud, __pud((unsigned long)pmd));
  47}
  48
  49pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  50{
  51        return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
  52}
  53
  54void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  55{
  56        kmem_cache_free(pmd_cachep, pmd);
  57}
  58#endif /* PAGETABLE_LEVELS > 2 */
  59