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_SPLITTING _PAGE_BIT_UNUSED1 /* only valid on a PSE pmd */
26 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
27
28 /* If _PAGE_BIT_PRESENT is clear, we use these: */
29 /* - if the user mapped it with PROT_NONE; pte_present gives true */
30 #define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
31 /* - set: nonlinear file mapping, saved PTE; unset:swap */
32 #define _PAGE_BIT_FILE _PAGE_BIT_DIRTY
33
34 #define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
35 #define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
36 #define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
37 #define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
38 #define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
39 #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
40 #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
41 #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
42 #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
43 #define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
44 #define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
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 _PAGE_SPLITTING (_AT(pteval_t, 1) << _PAGE_BIT_SPLITTING)
50 #define __HAVE_ARCH_PTE_SPECIAL
51
52 #ifdef CONFIG_KMEMCHECK
53 #define _PAGE_HIDDEN (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
54 #else
55 #define _PAGE_HIDDEN (_AT(pteval_t, 0))
56 #endif
57
58 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
59 #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
60 #else
61 #define _PAGE_NX (_AT(pteval_t, 0))
62 #endif
63
64 #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
65 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
66
67 /*
68 * _PAGE_NUMA indicates that this page will trigger a numa hinting
69 * minor page fault to gather numa placement statistics (see
70 * pte_numa()). The bit picked (8) is within the range between
71 * _PAGE_FILE (6) and _PAGE_PROTNONE (8) bits. Therefore, it doesn't
72 * require changes to the swp entry format because that bit is always
73 * zero when the pte is not present.
74 *
75 * The bit picked must be always zero when the pmd is present and not
76 * present, so that we don't lose information when we set it while
77 * atomically clearing the present bit.
78 *
79 * Because we shared the same bit (8) with _PAGE_PROTNONE this can be
80 * interpreted as _PAGE_NUMA only in places that _PAGE_PROTNONE
81 * couldn't reach, like handle_mm_fault() (see access_error in
82 * arch/x86/mm/fault.c, the vma protection must not be PROT_NONE for
83 * handle_mm_fault() to be invoked).
84 */
85 #define _PAGE_NUMA _PAGE_PROTNONE
86
87 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
88 _PAGE_ACCESSED | _PAGE_DIRTY)
89 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
90 _PAGE_DIRTY)
91
92 /* Set of bits not changed in pte_modify */
93 #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
94 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
95 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
96
97 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
98 #define _PAGE_CACHE_WB (0)
99 #define _PAGE_CACHE_WC (_PAGE_PWT)
100 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
101 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
102
103 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
104 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
105 _PAGE_ACCESSED | _PAGE_NX)
106
107 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
108 _PAGE_USER | _PAGE_ACCESSED)
109 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
110 _PAGE_ACCESSED | _PAGE_NX)
111 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
112 _PAGE_ACCESSED)
113 #define PAGE_COPY PAGE_COPY_NOEXEC
114 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
115 _PAGE_ACCESSED | _PAGE_NX)
116 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
117 _PAGE_ACCESSED)
118
119 #define __PAGE_KERNEL_EXEC \
120 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
121 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
122
123 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
124 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
125 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
126 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
127 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
128 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
129 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
130 #define __PAGE_KERNEL_VVAR (__PAGE_KERNEL_RO | _PAGE_USER)
131 #define __PAGE_KERNEL_VVAR_NOCACHE (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
132 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
133 #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
134 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
135
136 #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
137 #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
138 #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
139 #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
140
141 #define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
142 #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
143 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
144 #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
145 #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
146 #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
147 #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
148 #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
149 #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
150 #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
151 #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
152 #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
153 #define PAGE_KERNEL_VVAR __pgprot(__PAGE_KERNEL_VVAR)
154 #define PAGE_KERNEL_VVAR_NOCACHE __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)
155
156 #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
157 #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
158 #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
159 #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
160
161 /* xwr */
162 #define __P000 PAGE_NONE
163 #define __P001 PAGE_READONLY
164 #define __P010 PAGE_COPY
165 #define __P011 PAGE_COPY
166 #define __P100 PAGE_READONLY_EXEC
167 #define __P101 PAGE_READONLY_EXEC
168 #define __P110 PAGE_COPY_EXEC
169 #define __P111 PAGE_COPY_EXEC
170
171 #define __S000 PAGE_NONE
172 #define __S001 PAGE_READONLY
173 #define __S010 PAGE_SHARED
174 #define __S011 PAGE_SHARED
175 #define __S100 PAGE_READONLY_EXEC
176 #define __S101 PAGE_READONLY_EXEC
177 #define __S110 PAGE_SHARED_EXEC
178 #define __S111 PAGE_SHARED_EXEC
179
180 /*
181 * early identity mapping pte attrib macros.
182 */
183 #ifdef CONFIG_X86_64
184 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
185 #else
186 /*
187 * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
188 * bits are combined, this will alow user to access the high address mapped
189 * VDSO in the presence of CONFIG_COMPAT_VDSO
190 */
191 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
192 #define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
193 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
194 #endif
195
196 #ifdef CONFIG_X86_32
197 # include <asm/pgtable_32_types.h>
198 #else
199 # include <asm/pgtable_64_types.h>
200 #endif
201
202 #ifndef __ASSEMBLY__
203
204 #include <linux/types.h>
205
206 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
207 #define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
208
209 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
210 #define PTE_FLAGS_MASK (~PTE_PFN_MASK)
211
212 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
213
214 typedef struct { pgdval_t pgd; } pgd_t;
215
native_make_pgd(pgdval_t val)216 static inline pgd_t native_make_pgd(pgdval_t val)
217 {
218 return (pgd_t) { val };
219 }
220
native_pgd_val(pgd_t pgd)221 static inline pgdval_t native_pgd_val(pgd_t pgd)
222 {
223 return pgd.pgd;
224 }
225
pgd_flags(pgd_t pgd)226 static inline pgdval_t pgd_flags(pgd_t pgd)
227 {
228 return native_pgd_val(pgd) & PTE_FLAGS_MASK;
229 }
230
231 #if PAGETABLE_LEVELS > 3
232 typedef struct { pudval_t pud; } pud_t;
233
native_make_pud(pmdval_t val)234 static inline pud_t native_make_pud(pmdval_t val)
235 {
236 return (pud_t) { val };
237 }
238
native_pud_val(pud_t pud)239 static inline pudval_t native_pud_val(pud_t pud)
240 {
241 return pud.pud;
242 }
243 #else
244 #include <asm-generic/pgtable-nopud.h>
245
native_pud_val(pud_t pud)246 static inline pudval_t native_pud_val(pud_t pud)
247 {
248 return native_pgd_val(pud.pgd);
249 }
250 #endif
251
252 #if PAGETABLE_LEVELS > 2
253 typedef struct { pmdval_t pmd; } pmd_t;
254
native_make_pmd(pmdval_t val)255 static inline pmd_t native_make_pmd(pmdval_t val)
256 {
257 return (pmd_t) { val };
258 }
259
native_pmd_val(pmd_t pmd)260 static inline pmdval_t native_pmd_val(pmd_t pmd)
261 {
262 return pmd.pmd;
263 }
264 #else
265 #include <asm-generic/pgtable-nopmd.h>
266
native_pmd_val(pmd_t pmd)267 static inline pmdval_t native_pmd_val(pmd_t pmd)
268 {
269 return native_pgd_val(pmd.pud.pgd);
270 }
271 #endif
272
pud_flags(pud_t pud)273 static inline pudval_t pud_flags(pud_t pud)
274 {
275 return native_pud_val(pud) & PTE_FLAGS_MASK;
276 }
277
pmd_flags(pmd_t pmd)278 static inline pmdval_t pmd_flags(pmd_t pmd)
279 {
280 return native_pmd_val(pmd) & PTE_FLAGS_MASK;
281 }
282
native_make_pte(pteval_t val)283 static inline pte_t native_make_pte(pteval_t val)
284 {
285 return (pte_t) { .pte = val };
286 }
287
native_pte_val(pte_t pte)288 static inline pteval_t native_pte_val(pte_t pte)
289 {
290 return pte.pte;
291 }
292
pte_flags(pte_t pte)293 static inline pteval_t pte_flags(pte_t pte)
294 {
295 return native_pte_val(pte) & PTE_FLAGS_MASK;
296 }
297
298 #define pgprot_val(x) ((x).pgprot)
299 #define __pgprot(x) ((pgprot_t) { (x) } )
300
301
302 typedef struct page *pgtable_t;
303
304 extern pteval_t __supported_pte_mask;
305 extern void set_nx(void);
306 extern int nx_enabled;
307
308 #define pgprot_writecombine pgprot_writecombine
309 extern pgprot_t pgprot_writecombine(pgprot_t prot);
310
311 /* Indicate that x86 has its own track and untrack pfn vma functions */
312 #define __HAVE_PFNMAP_TRACKING
313
314 #define __HAVE_PHYS_MEM_ACCESS_PROT
315 struct file;
316 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
317 unsigned long size, pgprot_t vma_prot);
318 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
319 unsigned long size, pgprot_t *vma_prot);
320
321 /* Install a pte for a particular vaddr in kernel space. */
322 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
323
324 #ifdef CONFIG_X86_32
325 extern void native_pagetable_init(void);
326 #else
327 #define native_pagetable_init paging_init
328 #endif
329
330 struct seq_file;
331 extern void arch_report_meminfo(struct seq_file *m);
332
333 enum pg_level {
334 PG_LEVEL_NONE,
335 PG_LEVEL_4K,
336 PG_LEVEL_2M,
337 PG_LEVEL_1G,
338 PG_LEVEL_NUM
339 };
340
341 #ifdef CONFIG_PROC_FS
342 extern void update_page_count(int level, unsigned long pages);
343 #else
update_page_count(int level,unsigned long pages)344 static inline void update_page_count(int level, unsigned long pages) { }
345 #endif
346
347 /*
348 * Helper function that returns the kernel pagetable entry controlling
349 * the virtual address 'address'. NULL means no pagetable entry present.
350 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
351 * as a pte too.
352 */
353 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
354 extern phys_addr_t slow_virt_to_phys(void *__address);
355
356 #endif /* !__ASSEMBLY__ */
357
358 #endif /* _ASM_X86_PGTABLE_DEFS_H */
359