126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
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* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_PGALLOC_H
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#define _ASM_PGALLOC_H
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#include <linux/config.h>
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#include <linux/highmem.h>
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#include <linux/mm.h>
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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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/*
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* Initialize a new pgd / pmd table with invalid pointers.
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*/
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extern void pgd_init(unsigned long page);
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extern void pmd_init(unsigned long page, unsigned long pagetable);
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *ret, *init;
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ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
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if (ret) {
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init = pgd_offset(&init_mm, 0);
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pgd_init((unsigned long)ret);
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memcpy(ret + USER_PTRS_PER_PGD, init + 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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return ret;
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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free_pages((unsigned long)pgd, PGD_ORDER);
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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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pte_t *pte;
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pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
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return pte;
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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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struct page *pte;
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pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
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if (pte)
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clear_highpage(pte);
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return pte;
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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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free_pages((unsigned long)pte, PTE_ORDER);
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}
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static inline void pte_free(struct page *pte)
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{
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__free_pages(pte, PTE_ORDER);
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}
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#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
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#ifdef CONFIG_32BIT
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#define pgd_populate(mm, pmd, pte) BUG()
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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_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
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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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#endif
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#ifdef CONFIG_64BIT
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#define pgd_populate(mm, pgd, pmd) set_pgd(pgd, __pgd(pmd))
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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pmd_t *pmd;
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pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
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if (pmd)
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pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
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return pmd;
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}
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static inline void pmd_free(pmd_t *pmd)
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{
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free_pages((unsigned long)pmd, PMD_ORDER);
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}
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#define __pmd_free_tlb(tlb,x) pmd_free(x)
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#endif
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#define check_pgt_cache() do { } while (0)
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#endif /* _ASM_PGALLOC_H */
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