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1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle | |
7 | * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. | |
8 | */ | |
9 | #ifndef _ASM_PGTABLE_32_H | |
10 | #define _ASM_PGTABLE_32_H | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <asm/addrspace.h> | |
14 | #include <asm/page.h> | |
15 | ||
16 | #include <linux/linkage.h> | |
17 | #include <asm/cachectl.h> | |
18 | #include <asm/fixmap.h> | |
19 | ||
20 | /* | |
21 | * - add_wired_entry() add a fixed TLB entry, and move wired register | |
22 | */ | |
23 | extern void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1, | |
24 | unsigned long entryhi, unsigned long pagemask); | |
25 | ||
26 | /* | |
27 | * - add_temporary_entry() add a temporary TLB entry. We use TLB entries | |
28 | * starting at the top and working down. This is for populating the | |
29 | * TLB before trap_init() puts the TLB miss handler in place. It | |
30 | * should be used only for entries matching the actual page tables, | |
31 | * to prevent inconsistencies. | |
32 | */ | |
33 | extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1, | |
34 | unsigned long entryhi, unsigned long pagemask); | |
35 | ||
36 | ||
37 | /* Basically we have the same two-level (which is the logical three level | |
38 | * Linux page table layout folded) page tables as the i386. Some day | |
39 | * when we have proper page coloring support we can have a 1% quicker | |
40 | * tlb refill handling mechanism, but for now it is a bit slower but | |
41 | * works even with the cache aliasing problem the R4k and above have. | |
42 | */ | |
43 | ||
44 | /* PMD_SHIFT determines the size of the area a second-level page table can map */ | |
45 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
46 | #define PMD_SHIFT 21 | |
47 | #else | |
48 | #define PMD_SHIFT 22 | |
49 | #endif | |
50 | #define PMD_SIZE (1UL << PMD_SHIFT) | |
51 | #define PMD_MASK (~(PMD_SIZE-1)) | |
52 | ||
53 | /* PGDIR_SHIFT determines what a third-level page table entry can map */ | |
54 | #define PGDIR_SHIFT PMD_SHIFT | |
55 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | |
56 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | |
57 | ||
58 | /* | |
59 | * Entries per page directory level: we use two-level, so | |
60 | * we don't really have any PMD directory physically. | |
61 | */ | |
62 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
63 | #define PGD_ORDER 1 | |
64 | #define PMD_ORDER 0 | |
65 | #define PTE_ORDER 0 | |
66 | #else | |
67 | #define PGD_ORDER 0 | |
68 | #define PMD_ORDER 0 | |
69 | #define PTE_ORDER 0 | |
70 | #endif | |
71 | ||
72 | #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) | |
73 | #define PTRS_PER_PMD 1 | |
74 | #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) | |
75 | ||
76 | #define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE) | |
d455a369 | 77 | #define FIRST_USER_ADDRESS 0 |
1da177e4 LT |
78 | |
79 | #define VMALLOC_START KSEG2 | |
80 | ||
81 | #ifdef CONFIG_HIGHMEM | |
82 | # define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE) | |
83 | #else | |
84 | # define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) | |
85 | #endif | |
86 | ||
87 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
88 | #define pte_ERROR(e) \ | |
89 | printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e)) | |
90 | #else | |
91 | #define pte_ERROR(e) \ | |
92 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) | |
93 | #endif | |
94 | #define pmd_ERROR(e) \ | |
95 | printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) | |
96 | #define pgd_ERROR(e) \ | |
97 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
98 | ||
99 | extern void load_pgd(unsigned long pg_dir); | |
100 | ||
101 | extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)]; | |
102 | ||
103 | /* | |
104 | * Empty pgd/pmd entries point to the invalid_pte_table. | |
105 | */ | |
106 | static inline int pmd_none(pmd_t pmd) | |
107 | { | |
108 | return pmd_val(pmd) == (unsigned long) invalid_pte_table; | |
109 | } | |
110 | ||
111 | #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) | |
112 | ||
113 | static inline int pmd_present(pmd_t pmd) | |
114 | { | |
115 | return pmd_val(pmd) != (unsigned long) invalid_pte_table; | |
116 | } | |
117 | ||
118 | static inline void pmd_clear(pmd_t *pmdp) | |
119 | { | |
120 | pmd_val(*pmdp) = ((unsigned long) invalid_pte_table); | |
121 | } | |
122 | ||
123 | /* | |
124 | * The "pgd_xxx()" functions here are trivial for a folded two-level | |
125 | * setup: the pgd is never bad, and a pmd always exists (as it's folded | |
126 | * into the pgd entry) | |
127 | */ | |
128 | static inline int pgd_none(pgd_t pgd) { return 0; } | |
129 | static inline int pgd_bad(pgd_t pgd) { return 0; } | |
130 | static inline int pgd_present(pgd_t pgd) { return 1; } | |
131 | static inline void pgd_clear(pgd_t *pgdp) { } | |
132 | ||
133 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) | |
134 | #define pte_page(x) pfn_to_page(pte_pfn(x)) | |
135 | #define pte_pfn(x) ((unsigned long)((x).pte_high >> 6)) | |
136 | static inline pte_t | |
137 | pfn_pte(unsigned long pfn, pgprot_t prot) | |
138 | { | |
139 | pte_t pte; | |
140 | pte.pte_high = (pfn << 6) | (pgprot_val(prot) & 0x3f); | |
141 | pte.pte_low = pgprot_val(prot); | |
142 | return pte; | |
143 | } | |
144 | ||
145 | #else | |
146 | ||
147 | #define pte_page(x) pfn_to_page(pte_pfn(x)) | |
148 | ||
149 | #ifdef CONFIG_CPU_VR41XX | |
150 | #define pte_pfn(x) ((unsigned long)((x).pte >> (PAGE_SHIFT + 2))) | |
151 | #define pfn_pte(pfn, prot) __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot)) | |
152 | #else | |
153 | #define pte_pfn(x) ((unsigned long)((x).pte >> PAGE_SHIFT)) | |
154 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
155 | #endif | |
156 | #endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) */ | |
157 | ||
158 | #define __pgd_offset(address) pgd_index(address) | |
159 | #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) | |
160 | ||
161 | /* to find an entry in a kernel page-table-directory */ | |
162 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
163 | ||
164 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) | |
165 | ||
166 | /* to find an entry in a page-table-directory */ | |
167 | #define pgd_offset(mm,addr) ((mm)->pgd + pgd_index(addr)) | |
168 | ||
169 | /* Find an entry in the second-level page table.. */ | |
170 | static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address) | |
171 | { | |
172 | return (pmd_t *) dir; | |
173 | } | |
174 | ||
175 | /* Find an entry in the third-level page table.. */ | |
176 | #define __pte_offset(address) \ | |
177 | (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
178 | #define pte_offset(dir, address) \ | |
179 | ((pte_t *) (pmd_page_kernel(*dir)) + __pte_offset(address)) | |
180 | #define pte_offset_kernel(dir, address) \ | |
181 | ((pte_t *) pmd_page_kernel(*(dir)) + __pte_offset(address)) | |
182 | ||
183 | #define pte_offset_map(dir, address) \ | |
184 | ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address)) | |
185 | #define pte_offset_map_nested(dir, address) \ | |
186 | ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address)) | |
187 | #define pte_unmap(pte) ((void)(pte)) | |
188 | #define pte_unmap_nested(pte) ((void)(pte)) | |
189 | ||
190 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
191 | ||
192 | /* Swap entries must have VALID bit cleared. */ | |
193 | #define __swp_type(x) (((x).val >> 10) & 0x1f) | |
194 | #define __swp_offset(x) ((x).val >> 15) | |
195 | #define __swp_entry(type,offset) \ | |
196 | ((swp_entry_t) { ((type) << 10) | ((offset) << 15) }) | |
197 | ||
198 | /* | |
199 | * Bits 0, 1, 2, 9 and 10 are taken, split up the 27 bits of offset | |
200 | * into this range: | |
201 | */ | |
202 | #define PTE_FILE_MAX_BITS 27 | |
203 | ||
204 | #define pte_to_pgoff(_pte) \ | |
205 | ((((_pte).pte >> 3) & 0x3f ) + (((_pte).pte >> 11) << 8 )) | |
206 | ||
207 | #define pgoff_to_pte(off) \ | |
208 | ((pte_t) { (((off) & 0x3f) << 3) + (((off) >> 8) << 11) + _PAGE_FILE }) | |
209 | ||
210 | #else | |
211 | ||
212 | /* Swap entries must have VALID and GLOBAL bits cleared. */ | |
213 | #define __swp_type(x) (((x).val >> 8) & 0x1f) | |
214 | #define __swp_offset(x) ((x).val >> 13) | |
215 | #define __swp_entry(type,offset) \ | |
216 | ((swp_entry_t) { ((type) << 8) | ((offset) << 13) }) | |
217 | ||
218 | /* | |
219 | * Bits 0, 1, 2, 7 and 8 are taken, split up the 27 bits of offset | |
220 | * into this range: | |
221 | */ | |
222 | #define PTE_FILE_MAX_BITS 27 | |
223 | ||
224 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) | |
225 | /* fixme */ | |
226 | #define pte_to_pgoff(_pte) (((_pte).pte_high >> 6) + ((_pte).pte_high & 0x3f)) | |
227 | #define pgoff_to_pte(off) \ | |
228 | ((pte_t){(((off) & 0x3f) + ((off) << 6) + _PAGE_FILE)}) | |
229 | ||
230 | #else | |
231 | #define pte_to_pgoff(_pte) \ | |
232 | ((((_pte).pte >> 3) & 0x1f ) + (((_pte).pte >> 9) << 6 )) | |
233 | ||
234 | #define pgoff_to_pte(off) \ | |
235 | ((pte_t) { (((off) & 0x1f) << 3) + (((off) >> 6) << 9) + _PAGE_FILE }) | |
236 | #endif | |
237 | ||
238 | #endif | |
239 | ||
240 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
241 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
242 | ||
243 | #endif /* _ASM_PGTABLE_32_H */ |