arch/sh/mm/pgtable.c

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