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1da177e4 LT |
1 | /* |
2 | * Copyright 2003 PathScale Inc | |
3 | * Derived from include/asm-i386/pgtable.h | |
4 | * Licensed under the GPL | |
5 | */ | |
6 | ||
7 | #ifndef __UM_PGTABLE_3LEVEL_H | |
8 | #define __UM_PGTABLE_3LEVEL_H | |
9 | ||
10 | #include <asm-generic/pgtable-nopud.h> | |
11 | ||
12 | /* PGDIR_SHIFT determines what a third-level page table entry can map */ | |
13 | ||
655e4ed0 | 14 | #ifdef CONFIG_64BIT |
1da177e4 | 15 | #define PGDIR_SHIFT 30 |
655e4ed0 JD |
16 | #else |
17 | #define PGDIR_SHIFT 31 | |
18 | #endif | |
1da177e4 LT |
19 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
20 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | |
21 | ||
22 | /* PMD_SHIFT determines the size of the area a second-level page table can | |
23 | * map | |
24 | */ | |
25 | ||
26 | #define PMD_SHIFT 21 | |
27 | #define PMD_SIZE (1UL << PMD_SHIFT) | |
28 | #define PMD_MASK (~(PMD_SIZE-1)) | |
29 | ||
30 | /* | |
31 | * entries per page directory level | |
32 | */ | |
33 | ||
34 | #define PTRS_PER_PTE 512 | |
655e4ed0 | 35 | #ifdef CONFIG_64BIT |
1da177e4 | 36 | #define PTRS_PER_PMD 512 |
1da177e4 | 37 | #define PTRS_PER_PGD 512 |
655e4ed0 JD |
38 | #else |
39 | #define PTRS_PER_PMD 1024 | |
40 | #define PTRS_PER_PGD 1024 | |
41 | #endif | |
42 | ||
43 | #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) | |
d455a369 | 44 | #define FIRST_USER_ADDRESS 0 |
1da177e4 LT |
45 | |
46 | #define pte_ERROR(e) \ | |
47 | printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \ | |
48 | pte_val(e)) | |
49 | #define pmd_ERROR(e) \ | |
50 | printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ | |
51 | pmd_val(e)) | |
52 | #define pgd_ERROR(e) \ | |
53 | printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ | |
54 | pgd_val(e)) | |
55 | ||
56 | #define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE)) | |
57 | #define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) | |
58 | #define pud_present(x) (pud_val(x) & _PAGE_PRESENT) | |
59 | #define pud_populate(mm, pud, pmd) \ | |
60 | set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd))) | |
61 | ||
655e4ed0 | 62 | #ifdef CONFIG_64BIT |
1da177e4 | 63 | #define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval)) |
655e4ed0 JD |
64 | #else |
65 | #define set_pud(pudptr, pudval) (*(pudptr) = (pudval)) | |
66 | #endif | |
67 | ||
1da177e4 LT |
68 | static inline int pgd_newpage(pgd_t pgd) |
69 | { | |
70 | return(pgd_val(pgd) & _PAGE_NEWPAGE); | |
71 | } | |
72 | ||
73 | static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; } | |
74 | ||
655e4ed0 | 75 | #ifdef CONFIG_64BIT |
1da177e4 | 76 | #define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval)) |
655e4ed0 JD |
77 | #else |
78 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) | |
79 | #endif | |
1da177e4 | 80 | |
8192ab42 JD |
81 | struct mm_struct; |
82 | extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address); | |
1da177e4 | 83 | |
b21d4b08 | 84 | static inline void pud_clear (pud_t *pud) |
7ef93905 | 85 | { |
8cd8fa55 | 86 | set_pud(pud, __pud(_PAGE_NEWPAGE)); |
1da177e4 LT |
87 | } |
88 | ||
46a82b2d | 89 | #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK) |
909e90d3 | 90 | #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK)) |
1da177e4 LT |
91 | |
92 | /* Find an entry in the second-level page table.. */ | |
46a82b2d | 93 | #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \ |
1da177e4 LT |
94 | pmd_index(address)) |
95 | ||
1da177e4 LT |
96 | static inline unsigned long pte_pfn(pte_t pte) |
97 | { | |
98 | return phys_to_pfn(pte_val(pte)); | |
99 | } | |
100 | ||
101 | static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot) | |
102 | { | |
103 | pte_t pte; | |
104 | phys_t phys = pfn_to_phys(page_nr); | |
105 | ||
106 | pte_set_val(pte, phys, pgprot); | |
107 | return pte; | |
108 | } | |
109 | ||
110 | static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot) | |
111 | { | |
112 | return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Bits 0 through 3 are taken in the low part of the pte, | |
117 | * put the 32 bits of offset into the high part. | |
118 | */ | |
119 | #define PTE_FILE_MAX_BITS 32 | |
120 | ||
c45166be | 121 | #ifdef CONFIG_64BIT |
1da177e4 LT |
122 | |
123 | #define pte_to_pgoff(p) ((p).pte >> 32) | |
124 | ||
f7fe8781 | 125 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE }) |
1da177e4 LT |
126 | |
127 | #else | |
128 | ||
129 | #define pte_to_pgoff(pte) ((pte).pte_high) | |
130 | ||
131 | #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) | |
132 | ||
133 | #endif | |
134 | ||
135 | #endif | |
136 | ||
137 | /* | |
138 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
139 | * Emacs will notice this stuff at the end of the file and automatically | |
140 | * adjust the settings for this buffer only. This must remain at the end | |
141 | * of the file. | |
142 | * --------------------------------------------------------------------------- | |
143 | * Local variables: | |
144 | * c-file-style: "linux" | |
145 | * End: | |
146 | */ |