4d258ad76a0fc04925ac484c1fa9b0bfc47a1cb9
[linux-2.6.git] / arch / x86 / include / asm / pgtable_types.h
1 #ifndef _ASM_X86_PGTABLE_DEFS_H
2 #define _ASM_X86_PGTABLE_DEFS_H
3
4 #include <linux/const.h>
5 #include <asm/page_types.h>
6
7 #define FIRST_USER_ADDRESS      0
8
9 #define _PAGE_BIT_PRESENT       0       /* is present */
10 #define _PAGE_BIT_RW            1       /* writeable */
11 #define _PAGE_BIT_USER          2       /* userspace addressable */
12 #define _PAGE_BIT_PWT           3       /* page write through */
13 #define _PAGE_BIT_PCD           4       /* page cache disabled */
14 #define _PAGE_BIT_ACCESSED      5       /* was accessed (raised by CPU) */
15 #define _PAGE_BIT_DIRTY         6       /* was written to (raised by CPU) */
16 #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
17 #define _PAGE_BIT_PAT           7       /* on 4KB pages */
18 #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
19 #define _PAGE_BIT_UNUSED1       9       /* available for programmer */
20 #define _PAGE_BIT_IOMAP         10      /* flag used to indicate IO mapping */
21 #define _PAGE_BIT_UNUSED3       11
22 #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
23 #define _PAGE_BIT_SPECIAL       _PAGE_BIT_UNUSED1
24 #define _PAGE_BIT_CPA_TEST      _PAGE_BIT_UNUSED1
25 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
26
27 /* If _PAGE_BIT_PRESENT is clear, we use these: */
28 /* - if the user mapped it with PROT_NONE; pte_present gives true */
29 #define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
30 /* - set: nonlinear file mapping, saved PTE; unset:swap */
31 #define _PAGE_BIT_FILE          _PAGE_BIT_DIRTY
32
33 #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
34 #define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
35 #define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
36 #define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
37 #define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
38 #define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
39 #define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
40 #define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
41 #define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
42 #define _PAGE_UNUSED1   (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
43 #define _PAGE_IOMAP     (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
44 #define _PAGE_UNUSED3   (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
45 #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
46 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
47 #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
48 #define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
49 #define __HAVE_ARCH_PTE_SPECIAL
50
51 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
52 #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
53 #else
54 #define _PAGE_NX        (_AT(pteval_t, 0))
55 #endif
56
57 #define _PAGE_FILE      (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
58 #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
59
60 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
61                          _PAGE_ACCESSED | _PAGE_DIRTY)
62 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
63                          _PAGE_DIRTY)
64
65 /* Set of bits not changed in pte_modify */
66 #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
67                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
68
69 #define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
70 #define _PAGE_CACHE_WB          (0)
71 #define _PAGE_CACHE_WC          (_PAGE_PWT)
72 #define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
73 #define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
74
75 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
76 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
77                                  _PAGE_ACCESSED | _PAGE_NX)
78
79 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
80                                          _PAGE_USER | _PAGE_ACCESSED)
81 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
82                                          _PAGE_ACCESSED | _PAGE_NX)
83 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
84                                          _PAGE_ACCESSED)
85 #define PAGE_COPY               PAGE_COPY_NOEXEC
86 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
87                                          _PAGE_ACCESSED | _PAGE_NX)
88 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
89                                          _PAGE_ACCESSED)
90
91 #define __PAGE_KERNEL_EXEC                                              \
92         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
93 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
94
95 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
96 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
97 #define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
98 #define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
99 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
100 #define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
101 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
102 #define __PAGE_KERNEL_VSYSCALL_NOCACHE  (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
103 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
104 #define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
105 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
106
107 #define __PAGE_KERNEL_IO                (__PAGE_KERNEL | _PAGE_IOMAP)
108 #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
109 #define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
110 #define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC | _PAGE_IOMAP)
111
112 #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
113 #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
114 #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
115 #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
116 #define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
117 #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
118 #define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
119 #define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
120 #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
121 #define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
122 #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
123 #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
124 #define PAGE_KERNEL_VSYSCALL_NOCACHE    __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
125
126 #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
127 #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
128 #define PAGE_KERNEL_IO_UC_MINUS         __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
129 #define PAGE_KERNEL_IO_WC               __pgprot(__PAGE_KERNEL_IO_WC)
130
131 /*         xwr */
132 #define __P000  PAGE_NONE
133 #define __P001  PAGE_READONLY
134 #define __P010  PAGE_COPY
135 #define __P011  PAGE_COPY
136 #define __P100  PAGE_READONLY_EXEC
137 #define __P101  PAGE_READONLY_EXEC
138 #define __P110  PAGE_COPY_EXEC
139 #define __P111  PAGE_COPY_EXEC
140
141 #define __S000  PAGE_NONE
142 #define __S001  PAGE_READONLY
143 #define __S010  PAGE_SHARED
144 #define __S011  PAGE_SHARED
145 #define __S100  PAGE_READONLY_EXEC
146 #define __S101  PAGE_READONLY_EXEC
147 #define __S110  PAGE_SHARED_EXEC
148 #define __S111  PAGE_SHARED_EXEC
149
150 /*
151  * early identity mapping  pte attrib macros.
152  */
153 #ifdef CONFIG_X86_64
154 #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
155 #else
156 /*
157  * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
158  * bits are combined, this will alow user to access the high address mapped
159  * VDSO in the presence of CONFIG_COMPAT_VDSO
160  */
161 #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
162 #define PDE_IDENT_ATTR   0x067          /* PRESENT+RW+USER+DIRTY+ACCESSED */
163 #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
164 #endif
165
166 #ifdef CONFIG_X86_32
167 # include "pgtable_32_types.h"
168 #else
169 # include "pgtable_64_types.h"
170 #endif
171
172 #ifndef __ASSEMBLY__
173
174 #include <linux/types.h>
175
176 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
177 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
178
179 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
180 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
181
182 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
183
184 typedef struct { pgdval_t pgd; } pgd_t;
185
186 static inline pgd_t native_make_pgd(pgdval_t val)
187 {
188         return (pgd_t) { val };
189 }
190
191 static inline pgdval_t native_pgd_val(pgd_t pgd)
192 {
193         return pgd.pgd;
194 }
195
196 static inline pgdval_t pgd_flags(pgd_t pgd)
197 {
198         return native_pgd_val(pgd) & PTE_FLAGS_MASK;
199 }
200
201 #if PAGETABLE_LEVELS > 3
202 typedef struct { pudval_t pud; } pud_t;
203
204 static inline pud_t native_make_pud(pmdval_t val)
205 {
206         return (pud_t) { val };
207 }
208
209 static inline pudval_t native_pud_val(pud_t pud)
210 {
211         return pud.pud;
212 }
213 #else
214 #include <asm-generic/pgtable-nopud.h>
215
216 static inline pudval_t native_pud_val(pud_t pud)
217 {
218         return native_pgd_val(pud.pgd);
219 }
220 #endif
221
222 #if PAGETABLE_LEVELS > 2
223 typedef struct { pmdval_t pmd; } pmd_t;
224
225 static inline pmd_t native_make_pmd(pmdval_t val)
226 {
227         return (pmd_t) { val };
228 }
229
230 static inline pmdval_t native_pmd_val(pmd_t pmd)
231 {
232         return pmd.pmd;
233 }
234 #else
235 #include <asm-generic/pgtable-nopmd.h>
236
237 static inline pmdval_t native_pmd_val(pmd_t pmd)
238 {
239         return native_pgd_val(pmd.pud.pgd);
240 }
241 #endif
242
243 static inline pudval_t pud_flags(pud_t pud)
244 {
245         return native_pud_val(pud) & PTE_FLAGS_MASK;
246 }
247
248 static inline pmdval_t pmd_flags(pmd_t pmd)
249 {
250         return native_pmd_val(pmd) & PTE_FLAGS_MASK;
251 }
252
253 static inline pte_t native_make_pte(pteval_t val)
254 {
255         return (pte_t) { .pte = val };
256 }
257
258 static inline pteval_t native_pte_val(pte_t pte)
259 {
260         return pte.pte;
261 }
262
263 static inline pteval_t pte_flags(pte_t pte)
264 {
265         return native_pte_val(pte) & PTE_FLAGS_MASK;
266 }
267
268 #define pgprot_val(x)   ((x).pgprot)
269 #define __pgprot(x)     ((pgprot_t) { (x) } )
270
271
272 typedef struct page *pgtable_t;
273
274 extern pteval_t __supported_pte_mask;
275 extern int nx_enabled;
276
277 #define pgprot_writecombine     pgprot_writecombine
278 extern pgprot_t pgprot_writecombine(pgprot_t prot);
279
280 /* Indicate that x86 has its own track and untrack pfn vma functions */
281 #define __HAVE_PFNMAP_TRACKING
282
283 #define __HAVE_PHYS_MEM_ACCESS_PROT
284 struct file;
285 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
286                               unsigned long size, pgprot_t vma_prot);
287 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
288                               unsigned long size, pgprot_t *vma_prot);
289
290 /* Install a pte for a particular vaddr in kernel space. */
291 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
292
293 #ifdef CONFIG_X86_32
294 extern void native_pagetable_setup_start(pgd_t *base);
295 extern void native_pagetable_setup_done(pgd_t *base);
296 #else
297 static inline void native_pagetable_setup_start(pgd_t *base) {}
298 static inline void native_pagetable_setup_done(pgd_t *base) {}
299 #endif
300
301 struct seq_file;
302 extern void arch_report_meminfo(struct seq_file *m);
303
304 enum {
305         PG_LEVEL_NONE,
306         PG_LEVEL_4K,
307         PG_LEVEL_2M,
308         PG_LEVEL_1G,
309         PG_LEVEL_NUM
310 };
311
312 #ifdef CONFIG_PROC_FS
313 extern void update_page_count(int level, unsigned long pages);
314 #else
315 static inline void update_page_count(int level, unsigned long pages) { }
316 #endif
317
318 /*
319  * Helper function that returns the kernel pagetable entry controlling
320  * the virtual address 'address'. NULL means no pagetable entry present.
321  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
322  * as a pte too.
323  */
324 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
325
326 #endif  /* !__ASSEMBLY__ */
327
328 #endif /* _ASM_X86_PGTABLE_DEFS_H */