1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/mm.h>
 3#include <linux/slab.h>
 4
 
 
 5static struct kmem_cache *pgd_cachep;
 6#if PAGETABLE_LEVELS > 2
 7static struct kmem_cache *pmd_cachep;
 8#endif
 9
10void 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
20void 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
32pgd_t *pgd_alloc(struct mm_struct *mm)
33{
34	return kmem_cache_alloc(pgd_cachep, GFP_KERNEL);
35}
36
37void pgd_free(struct mm_struct *mm, pgd_t *pgd)
38{
39	kmem_cache_free(pgd_cachep, pgd);
40}
41
42#if PAGETABLE_LEVELS > 2
43void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
44{
45	set_pud(pud, __pud((unsigned long)pmd));
46}
47
48pmd_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
53void pmd_free(struct mm_struct *mm, pmd_t *pmd)
54{
55	kmem_cache_free(pmd_cachep, pmd);
56}
57#endif /* PAGETABLE_LEVELS > 2 */

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/mm.h>
 3#include <linux/slab.h>
 4
 5#include <asm/pgalloc.h>
 6
 7static struct kmem_cache *pgd_cachep;
 8#if PAGETABLE_LEVELS > 2
 9static struct kmem_cache *pmd_cachep;
10#endif
11
12static 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
22void 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
34pgd_t *pgd_alloc(struct mm_struct *mm)
35{
36	return kmem_cache_alloc(pgd_cachep, GFP_KERNEL);
37}
38
39void pgd_free(struct mm_struct *mm, pgd_t *pgd)
40{
41	kmem_cache_free(pgd_cachep, pgd);
42}
43
44#if PAGETABLE_LEVELS > 2
45void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
46{
47	set_pud(pud, __pud((unsigned long)pmd));
48}
49
50pmd_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
55void pmd_free(struct mm_struct *mm, pmd_t *pmd)
56{
57	kmem_cache_free(pmd_cachep, pmd);
58}
59#endif /* PAGETABLE_LEVELS > 2 */