| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| |
| #include <asm/pgalloc.h> |
| |
| static struct kmem_cache *pgd_cachep; |
| #if PAGETABLE_LEVELS > 2 |
| static struct kmem_cache *pmd_cachep; |
| #endif |
| |
| static void pgd_ctor(void *x) |
| { |
| pgd_t *pgd = x; |
| |
| memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); |
| memcpy(pgd + USER_PTRS_PER_PGD, |
| swapper_pg_dir + USER_PTRS_PER_PGD, |
| (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
| } |
| |
| void pgtable_cache_init(void) |
| { |
| pgd_cachep = kmem_cache_create("pgd_cache", |
| PTRS_PER_PGD * (1<<PTE_MAGNITUDE), |
| PAGE_SIZE, SLAB_PANIC, pgd_ctor); |
| #if PAGETABLE_LEVELS > 2 |
| pmd_cachep = kmem_cache_create("pmd_cache", |
| PTRS_PER_PMD * (1<<PTE_MAGNITUDE), |
| PAGE_SIZE, SLAB_PANIC, NULL); |
| #endif |
| } |
| |
| pgd_t *pgd_alloc(struct mm_struct *mm) |
| { |
| return kmem_cache_alloc(pgd_cachep, GFP_KERNEL); |
| } |
| |
| void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
| { |
| kmem_cache_free(pgd_cachep, pgd); |
| } |
| |
| #if PAGETABLE_LEVELS > 2 |
| void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
| { |
| set_pud(pud, __pud((unsigned long)pmd)); |
| } |
| |
| pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) |
| { |
| return kmem_cache_alloc(pmd_cachep, GFP_KERNEL | __GFP_ZERO); |
| } |
| |
| void pmd_free(struct mm_struct *mm, pmd_t *pmd) |
| { |
| kmem_cache_free(pmd_cachep, pmd); |
| } |
| #endif /* PAGETABLE_LEVELS > 2 */ |