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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Copyright 2003 PathScale, Inc.
4 * Derived from include/asm-i386/pgtable.h
5 * Licensed under the GPL
6 */
7
8#ifndef __UM_PGTABLE_2LEVEL_H
9#define __UM_PGTABLE_2LEVEL_H
10
11#include <asm-generic/pgtable-nopmd.h>
12
13/* PGDIR_SHIFT determines what a third-level page table entry can map */
14
15#define PGDIR_SHIFT 22
16#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
17#define PGDIR_MASK (~(PGDIR_SIZE-1))
18
19/*
20 * entries per page directory level: the i386 is two-level, so
21 * we don't really have any PMD directory physically.
22 */
23#define PTRS_PER_PTE 1024
24#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
25#define PTRS_PER_PGD 1024
26#define FIRST_USER_ADDRESS 0
27
28#define pte_ERROR(e) \
29 printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
30 pte_val(e))
31#define pgd_ERROR(e) \
32 printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
33 pgd_val(e))
34
35static inline int pgd_newpage(pgd_t pgd) { return 0; }
36static inline void pgd_mkuptodate(pgd_t pgd) { }
37
38#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
39
40static inline pte_t pte_mknewprot(pte_t pte)
41{
42 pte_val(pte) |= _PAGE_NEWPROT;
43 return(pte);
44}
45
46static inline pte_t pte_mknewpage(pte_t pte)
47{
48 pte_val(pte) |= _PAGE_NEWPAGE;
49 return(pte);
50}
51
52static inline void set_pte(pte_t *pteptr, pte_t pteval)
53{
54 /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
55 * fix_range knows to unmap it. _PAGE_NEWPROT is specific to
56 * mapped pages.
57 */
58 *pteptr = pte_mknewpage(pteval);
59 if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
60}
61#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
62
63#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
64
65#define pte_page(x) pfn_to_page(pte_pfn(x))
66#define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE)
67#define pte_pfn(x) phys_to_pfn(pte_val(x))
68#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
69#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
70
71#define pmd_page_kernel(pmd) \
72 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
73
74/*
75 * Bits 0 through 3 are taken
76 */
77#define PTE_FILE_MAX_BITS 28
78
79#define pte_to_pgoff(pte) (pte_val(pte) >> 4)
80
81#define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE })
82
83#endif