arch/sh/mm/pgtable.c

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