mirror of https://gitee.com/openkylin/linux.git
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Copyright 2003 PathScale, Inc.
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* Derived from include/asm-i386/pgtable.h
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* Licensed under the GPL
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*/
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#ifndef __UM_PGTABLE_2LEVEL_H
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#define __UM_PGTABLE_2LEVEL_H
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#include <asm-generic/pgtable-nopmd.h>
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/* PGDIR_SHIFT determines what a third-level page table entry can map */
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#define PGDIR_SHIFT 22
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/*
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* entries per page directory level: the i386 is two-level, so
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* we don't really have any PMD directory physically.
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*/
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#define PTRS_PER_PTE 1024
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#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
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#define PTRS_PER_PGD 1024
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#define FIRST_USER_PGD_NR 0
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
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pte_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
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pgd_val(e))
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static inline int pgd_newpage(pgd_t pgd) { return 0; }
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static inline void pgd_mkuptodate(pgd_t pgd) { }
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#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
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static inline pte_t pte_mknewprot(pte_t pte)
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{
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pte_val(pte) |= _PAGE_NEWPROT;
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return(pte);
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}
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static inline pte_t pte_mknewpage(pte_t pte)
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{
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pte_val(pte) |= _PAGE_NEWPAGE;
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return(pte);
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}
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static inline void set_pte(pte_t *pteptr, pte_t pteval)
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{
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/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
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* fix_range knows to unmap it. _PAGE_NEWPROT is specific to
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* mapped pages.
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*/
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*pteptr = pte_mknewpage(pteval);
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if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
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}
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE)
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#define pte_pfn(x) phys_to_pfn(pte_val(x))
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#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
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#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
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#define pmd_page_kernel(pmd) \
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((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
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/*
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* Bits 0 through 3 are taken
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*/
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#define PTE_FILE_MAX_BITS 28
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#define pte_to_pgoff(pte) (pte_val(pte) >> 4)
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#define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE })
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#endif
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