1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/mm.h>
3 #include <linux/slab.h>
4
5 static struct kmem_cache *pgd_cachep;
6 #if PAGETABLE_LEVELS > 2
7 static struct kmem_cache *pmd_cachep;
8 #endif
9
pgd_ctor(void * x)10 void pgd_ctor(void *x)
11 {
12 pgd_t *pgd = x;
13
14 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
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
pgtable_cache_init(void)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
pgd_alloc(struct mm_struct * mm)32 pgd_t *pgd_alloc(struct mm_struct *mm)
33 {
34 return kmem_cache_alloc(pgd_cachep, GFP_KERNEL);
35 }
36
pgd_free(struct mm_struct * mm,pgd_t * pgd)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
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)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
pmd_alloc_one(struct mm_struct * mm,unsigned long address)48 pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
49 {
50 return kmem_cache_alloc(pmd_cachep, GFP_KERNEL | __GFP_ZERO);
51 }
52
pmd_free(struct mm_struct * mm,pmd_t * pmd)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 */
58