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