84 строки
1.9 KiB
C
84 строки
1.9 KiB
C
#ifndef __ASM_SH_PGALLOC_H
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#define __ASM_SH_PGALLOC_H
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#include <linux/quicklist.h>
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#include <asm/page.h>
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#define QUICK_PGD 0 /* We preserve special mappings over free */
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#define QUICK_PT 1 /* Other page table pages that are zero on free */
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
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pte_t *pte)
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{
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set_pmd(pmd, __pmd((unsigned long)pte));
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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struct page *pte)
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{
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set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
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}
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static inline void pgd_ctor(void *x)
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{
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pgd_t *pgd = x;
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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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/*
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* Allocate and free page tables.
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*/
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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quicklist_free(QUICK_PGD, NULL, pgd);
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}
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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void *pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
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return pg ? virt_to_page(pg) : NULL;
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}
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static inline void pte_free_kernel(pte_t *pte)
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{
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quicklist_free(QUICK_PT, NULL, pte);
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}
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static inline void pte_free(struct page *pte)
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{
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quicklist_free_page(QUICK_PT, NULL, pte);
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}
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#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
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/*
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* allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pgd, so has no extra memory associated with it.
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*/
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#define pmd_free(x) do { } while (0)
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#define __pmd_free_tlb(tlb,x) do { } while (0)
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static inline void check_pgt_cache(void)
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{
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quicklist_trim(QUICK_PGD, NULL, 25, 16);
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quicklist_trim(QUICK_PT, NULL, 25, 16);
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}
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#endif /* __ASM_SH_PGALLOC_H */
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