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1da177e4 LT |
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_PGD_NR 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 | ||
35 | static inline int pgd_newpage(pgd_t pgd) { return 0; } | |
36 | static inline void pgd_mkuptodate(pgd_t pgd) { } | |
37 | ||
38 | #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE)) | |
39 | ||
40 | static inline pte_t pte_mknewprot(pte_t pte) | |
41 | { | |
42 | pte_val(pte) |= _PAGE_NEWPROT; | |
43 | return(pte); | |
44 | } | |
45 | ||
46 | static inline pte_t pte_mknewpage(pte_t pte) | |
47 | { | |
48 | pte_val(pte) |= _PAGE_NEWPAGE; | |
49 | return(pte); | |
50 | } | |
51 | ||
52 | static 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 |