38510754a5
Using a quicklist to allocate PTEs might be slightly faster than using the page allocator directly since we might avoid zeroing the page after each allocation. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_AVR32_PGALLOC_H
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#define __ASM_AVR32_PGALLOC_H
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#include <linux/quicklist.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#define QUICK_PGD 0 /* Preserve kernel mappings over free */
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#define QUICK_PT 1 /* Zero on free */
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static inline void pmd_populate_kernel(struct mm_struct *mm,
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pmd_t *pmd, 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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pgtable_t 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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#define pmd_pgtable(pmd) pmd_page(pmd)
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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(struct mm_struct *mm, 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 pgtable_t pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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struct page *page;
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void *pg;
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pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
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if (!pg)
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return NULL;
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page = virt_to_page(pg);
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pgtable_page_ctor(page);
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return page;
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}
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static inline void pte_free_kernel(struct mm_struct *mm, 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 mm_struct *mm, pgtable_t pte)
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{
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pgtable_page_dtor(pte);
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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) \
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do { \
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pgtable_page_dtor(pte); \
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tlb_remove_page((tlb), pte); \
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} 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_AVR32_PGALLOC_H */
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