131 строка
2.8 KiB
C
131 строка
2.8 KiB
C
/*
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* linux/include/asm-arm/pgalloc.h
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*
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* Copyright (C) 2000-2001 Russell King
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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 _ASMARM_PGALLOC_H
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#define _ASMARM_PGALLOC_H
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#include <asm/processor.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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/*
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* Since we have only two-level page tables, these are trivial
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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(pmd) do { } while (0)
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#define pgd_populate(mm,pmd,pte) BUG()
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extern pgd_t *get_pgd_slow(struct mm_struct *mm);
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extern void free_pgd_slow(pgd_t *pgd);
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#define pgd_alloc(mm) get_pgd_slow(mm)
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#define pgd_free(pgd) free_pgd_slow(pgd)
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#define check_pgt_cache() do { } while (0)
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/*
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* Allocate one PTE table.
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*
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* This actually allocates two hardware PTE tables, but we wrap this up
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* into one table thus:
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*
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* +------------+
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* | h/w pt 0 |
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* +------------+
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* | h/w pt 1 |
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* +------------+
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* | Linux pt 0 |
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* +------------+
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* | Linux pt 1 |
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* +------------+
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*/
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static inline pte_t *
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pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
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{
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pte_t *pte;
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pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
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if (pte) {
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clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE);
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pte += PTRS_PER_PTE;
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}
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return pte;
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}
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static inline struct page *
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pte_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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struct page *pte;
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pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
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if (pte) {
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void *page = page_address(pte);
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clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE);
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}
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return pte;
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}
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/*
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* Free one PTE table.
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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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if (pte) {
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pte -= PTRS_PER_PTE;
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free_page((unsigned long)pte);
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}
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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_page(pte);
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}
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/*
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* Populate the pmdp entry with a pointer to the pte. This pmd is part
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* of the mm address space.
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*
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* Ensure that we always set both PMD entries.
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*/
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
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{
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unsigned long pte_ptr = (unsigned long)ptep;
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unsigned long pmdval;
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BUG_ON(mm != &init_mm);
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/*
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* The pmd must be loaded with the physical
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* address of the PTE table
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*/
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pte_ptr -= PTRS_PER_PTE * sizeof(void *);
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pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
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pmdp[0] = __pmd(pmdval);
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pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
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flush_pmd_entry(pmdp);
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}
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static inline void
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pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep)
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{
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unsigned long pmdval;
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BUG_ON(mm == &init_mm);
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pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
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pmdp[0] = __pmd(pmdval);
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pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
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flush_pmd_entry(pmdp);
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}
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#endif
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