| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | #include <linux/mm.h> |
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| 3 | #include <linux/slab.h> |
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| 4 | |
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| 5 | static struct kmem_cache *pgd_cachep; |
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| 6 | #if PAGETABLE_LEVELS > 2 |
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| 7 | static struct kmem_cache *pmd_cachep; |
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| 8 | #endif |
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| 9 | |
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| 10 | void pgd_ctor(void *x) |
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| 11 | { |
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| 12 | pgd_t *pgd = x; |
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| 13 | |
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| 14 | memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); |
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| 15 | memcpy(pgd + USER_PTRS_PER_PGD, |
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| 16 | swapper_pg_dir + USER_PTRS_PER_PGD, |
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| 17 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
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| 18 | } |
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| 19 | |
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| 20 | void pgtable_cache_init(void) |
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| 21 | { |
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| 22 | pgd_cachep = kmem_cache_create("pgd_cache" , |
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| 23 | PTRS_PER_PGD * (1<<PTE_MAGNITUDE), |
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| 24 | PAGE_SIZE, SLAB_PANIC, pgd_ctor); |
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| 25 | #if PAGETABLE_LEVELS > 2 |
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| 26 | pmd_cachep = kmem_cache_create("pmd_cache" , |
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| 27 | PTRS_PER_PMD * (1<<PTE_MAGNITUDE), |
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| 28 | PAGE_SIZE, SLAB_PANIC, NULL); |
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| 29 | #endif |
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| 30 | } |
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| 31 | |
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| 32 | pgd_t *pgd_alloc(struct mm_struct *mm) |
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| 33 | { |
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| 34 | return kmem_cache_alloc(cachep: pgd_cachep, GFP_KERNEL); |
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| 35 | } |
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| 36 | |
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| 37 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
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| 38 | { |
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| 39 | kmem_cache_free(s: pgd_cachep, objp: pgd); |
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| 40 | } |
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| 41 | |
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| 42 | #if PAGETABLE_LEVELS > 2 |
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| 43 | void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
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| 44 | { |
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| 45 | set_pud(pud, __pud((unsigned long)pmd)); |
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| 46 | } |
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| 47 | |
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| 48 | pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) |
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| 49 | { |
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| 50 | return kmem_cache_alloc(pmd_cachep, GFP_KERNEL | __GFP_ZERO); |
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| 51 | } |
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| 52 | |
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| 53 | void pmd_free(struct mm_struct *mm, pmd_t *pmd) |
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| 54 | { |
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| 55 | kmem_cache_free(pmd_cachep, pmd); |
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| 56 | } |
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| 57 | #endif /* PAGETABLE_LEVELS > 2 */ |
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| 58 | |
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