arch/sh/mm/pgtable.c

   1 #include <linux/mm.h>
   2 #include <linux/slab.h>
   3
   4 #define PGALLOC_GFP GFP_KERNEL | __GFP_ZERO
   5
   6 static struct kmem_cache *pgd_cachep;
   7 #if PAGETABLE_LEVELS > 2
   8 static struct kmem_cache *pmd_cachep;
   9 #endif
  10
  11 void pgd_ctor(void *x)
  12 {
  13         pgd_t *pgd = x;
  14
  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
  20 void 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
  32 pgd_t *pgd_alloc(struct mm_struct *mm)
  33 {
  34         return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
  35 }
  36
  37 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  38 {
  39         kmem_cache_free(pgd_cachep, pgd);
  40 }
  41
  42 #if PAGETABLE_LEVELS > 2
  43 void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  44 {
  45         set_pud(pud, __pud((unsigned long)pmd));
  46 }
  47
  48 pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  49 {
  50         return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
  51 }
  52
  53 void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  54 {
  55         kmem_cache_free(pmd_cachep, pmd);
  56 }
  57 #endif /* PAGETABLE_LEVELS > 2 */