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
   7 static struct kmem_cache *pgd_cachep;
   8 #if PAGETABLE_LEVELS > 2
   9 static struct kmem_cache *pmd_cachep;
  10 #endif
  11
  12 void 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
  21 void 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
  33 pgd_t *pgd_alloc(struct mm_struct *mm)
  34 {
  35         return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
  36 }
  37
  38 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  39 {
  40         kmem_cache_free(pgd_cachep, pgd);
  41 }
  42
  43 #if PAGETABLE_LEVELS > 2
  44 void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  45 {
  46         set_pud(pud, __pud((unsigned long)pmd));
  47 }
  48
  49 pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  50 {
  51         return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
  52 }
  53
  54 void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  55 {
  56         kmem_cache_free(pmd_cachep, pmd);
  57 }
  58 #endif /* PAGETABLE_LEVELS > 2 */