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_HIDDEN 11 /* hidden by kmemcheck */
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_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
45 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
46 #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
47 #define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
48 #define __HAVE_ARCH_PTE_SPECIAL
49
50 #ifdef CONFIG_KMEMCHECK
51 #define _PAGE_HIDDEN (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
52 #else
53 #define _PAGE_HIDDEN (_AT(pteval_t, 0))
54 #endif
55
56 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
57 #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
58 #else
59 #define _PAGE_NX (_AT(pteval_t, 0))
60 #endif
61
62 #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
63 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
64
65 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
66 _PAGE_ACCESSED | _PAGE_DIRTY)
67 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
68 _PAGE_DIRTY)
69
70 /* Set of bits not changed in pte_modify */
71 #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
72 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
73
74 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
75 #define _PAGE_CACHE_WB (0)
76 #define _PAGE_CACHE_WC (_PAGE_PWT)
77 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
78 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
79
80 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
81 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
82 _PAGE_ACCESSED | _PAGE_NX)
83
84 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
85 _PAGE_USER | _PAGE_ACCESSED)
86 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
87 _PAGE_ACCESSED | _PAGE_NX)
88 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
89 _PAGE_ACCESSED)
90 #define PAGE_COPY PAGE_COPY_NOEXEC
91 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
92 _PAGE_ACCESSED | _PAGE_NX)
93 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
94 _PAGE_ACCESSED)
95
96 #define __PAGE_KERNEL_EXEC \
97 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
98 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
99
100 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
101 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
102 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
103 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
104 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
105 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
106 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
107 #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
108 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
109 #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
110 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
111
112 #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
113 #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
114 #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
115 #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
116
117 #define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
118 #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
119 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
120 #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
121 #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
122 #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
123 #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
124 #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
125 #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
126 #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
127 #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
128 #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
129 #define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
130
131 #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
132 #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
133 #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
134 #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
135
136 /* xwr */
137 #define __P000 PAGE_NONE
138 #define __P001 PAGE_READONLY
139 #define __P010 PAGE_COPY
140 #define __P011 PAGE_COPY
141 #define __P100 PAGE_READONLY_EXEC
142 #define __P101 PAGE_READONLY_EXEC
143 #define __P110 PAGE_COPY_EXEC
144 #define __P111 PAGE_COPY_EXEC
145
146 #define __S000 PAGE_NONE
147 #define __S001 PAGE_READONLY
148 #define __S010 PAGE_SHARED
149 #define __S011 PAGE_SHARED
150 #define __S100 PAGE_READONLY_EXEC
151 #define __S101 PAGE_READONLY_EXEC
152 #define __S110 PAGE_SHARED_EXEC
153 #define __S111 PAGE_SHARED_EXEC
154
155 /*
156 * early identity mapping pte attrib macros.
157 */
158 #ifdef CONFIG_X86_64
159 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
160 #else
161 /*
162 * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
163 * bits are combined, this will alow user to access the high address mapped
164 * VDSO in the presence of CONFIG_COMPAT_VDSO
165 */
166 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
167 #define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
168 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
169 #endif
170
171 #ifdef CONFIG_X86_32
172 # include "pgtable_32_types.h"
173 #else
174 # include "pgtable_64_types.h"
175 #endif
176
177 #ifndef __ASSEMBLY__
178
179 #include <linux/types.h>
180
181 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
182 #define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
183
184 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
185 #define PTE_FLAGS_MASK (~PTE_PFN_MASK)
186
187 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
188
189 typedef struct { pgdval_t pgd; } pgd_t;
190
191 static inline pgd_t native_make_pgd(pgdval_t val)
192 {
193 return (pgd_t) { val };
194 }
195
196 static inline pgdval_t native_pgd_val(pgd_t pgd)
197 {
198 return pgd.pgd;
199 }
200
201 static inline pgdval_t pgd_flags(pgd_t pgd)
202 {
203 return native_pgd_val(pgd) & PTE_FLAGS_MASK;
204 }
205
206 #if PAGETABLE_LEVELS > 3
207 typedef struct { pudval_t pud; } pud_t;
208
209 static inline pud_t native_make_pud(pmdval_t val)
210 {
211 return (pud_t) { val };
212 }
213
214 static inline pudval_t native_pud_val(pud_t pud)
215 {
216 return pud.pud;
217 }
218 #else
219 #include <asm-generic/pgtable-nopud.h>
220
221 static inline pudval_t native_pud_val(pud_t pud)
222 {
223 return native_pgd_val(pud.pgd);
224 }
225 #endif
226
227 #if PAGETABLE_LEVELS > 2
228 typedef struct { pmdval_t pmd; } pmd_t;
229
230 static inline pmd_t native_make_pmd(pmdval_t val)
231 {
232 return (pmd_t) { val };
233 }
234
235 static inline pmdval_t native_pmd_val(pmd_t pmd)
236 {
237 return pmd.pmd;
238 }
239 #else
240 #include <asm-generic/pgtable-nopmd.h>
241
242 static inline pmdval_t native_pmd_val(pmd_t pmd)
243 {
244 return native_pgd_val(pmd.pud.pgd);
245 }
246 #endif
247
248 static inline pudval_t pud_flags(pud_t pud)
249 {
250 return native_pud_val(pud) & PTE_FLAGS_MASK;
251 }
252
253 static inline pmdval_t pmd_flags(pmd_t pmd)
254 {
255 return native_pmd_val(pmd) & PTE_FLAGS_MASK;
256 }
257
258 static inline pte_t native_make_pte(pteval_t val)
259 {
260 return (pte_t) { .pte = val };
261 }
262
263 static inline pteval_t native_pte_val(pte_t pte)
264 {
265 return pte.pte;
266 }
267
268 static inline pteval_t pte_flags(pte_t pte)
269 {
270 return native_pte_val(pte) & PTE_FLAGS_MASK;
271 }
272
273 #define pgprot_val(x) ((x).pgprot)
274 #define __pgprot(x) ((pgprot_t) { (x) } )
275
276
277 typedef struct page *pgtable_t;
278
279 extern pteval_t __supported_pte_mask;
280 extern int nx_enabled;
281
282 #define pgprot_writecombine pgprot_writecombine
283 extern pgprot_t pgprot_writecombine(pgprot_t prot);
284
285 /* Indicate that x86 has its own track and untrack pfn vma functions */
286 #define __HAVE_PFNMAP_TRACKING
287
288 #define __HAVE_PHYS_MEM_ACCESS_PROT
289 struct file;
290 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
291 unsigned long size, pgprot_t vma_prot);
292 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
293 unsigned long size, pgprot_t *vma_prot);
294
295 /* Install a pte for a particular vaddr in kernel space. */
296 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
297
298 #ifdef CONFIG_X86_32
299 extern void native_pagetable_setup_start(pgd_t *base);
300 extern void native_pagetable_setup_done(pgd_t *base);
301 #else
302 static inline void native_pagetable_setup_start(pgd_t *base) {}
303 static inline void native_pagetable_setup_done(pgd_t *base) {}
304 #endif
305
306 struct seq_file;
307 extern void arch_report_meminfo(struct seq_file *m);
308
309 enum {
310 PG_LEVEL_NONE,
311 PG_LEVEL_4K,
312 PG_LEVEL_2M,
313 PG_LEVEL_1G,
314 PG_LEVEL_NUM
315 };
316
317 #ifdef CONFIG_PROC_FS
318 extern void update_page_count(int level, unsigned long pages);
319 #else
320 static inline void update_page_count(int level, unsigned long pages) { }
321 #endif
322
323 /*
324 * Helper function that returns the kernel pagetable entry controlling
325 * the virtual address 'address'. NULL means no pagetable entry present.
326 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
327 * as a pte too.
328 */
329 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
330
331 #endif /* !__ASSEMBLY__ */
332
333 #endif /* _ASM_X86_PGTABLE_DEFS_H */
334
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