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
pgd_ctor(void * x)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
pgtable_cache_init(void)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
pgd_alloc(struct mm_struct * mm)34 pgd_t *pgd_alloc(struct mm_struct *mm)
35 {
36 return kmem_cache_alloc(pgd_cachep, GFP_KERNEL);
37 }
38
pgd_free(struct mm_struct * mm,pgd_t * pgd)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
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)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
pmd_alloc_one(struct mm_struct * mm,unsigned long address)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
pmd_free(struct mm_struct * mm,pmd_t * pmd)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 */
60