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 */ 60