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pgtable_types.h
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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 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
68  _PAGE_ACCESSED | _PAGE_DIRTY)
69 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
70  _PAGE_DIRTY)
71 
72 /* Set of bits not changed in pte_modify */
73 #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
74  _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
75 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
76 
77 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
78 #define _PAGE_CACHE_WB (0)
79 #define _PAGE_CACHE_WC (_PAGE_PWT)
80 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
81 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
82 
83 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
84 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
85  _PAGE_ACCESSED | _PAGE_NX)
86 
87 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
88  _PAGE_USER | _PAGE_ACCESSED)
89 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
90  _PAGE_ACCESSED | _PAGE_NX)
91 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
92  _PAGE_ACCESSED)
93 #define PAGE_COPY PAGE_COPY_NOEXEC
94 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
95  _PAGE_ACCESSED | _PAGE_NX)
96 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
97  _PAGE_ACCESSED)
98 
99 #define __PAGE_KERNEL_EXEC \
100  (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
101 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
102 
103 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
104 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
105 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
106 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
107 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
108 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
109 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
110 #define __PAGE_KERNEL_VVAR (__PAGE_KERNEL_RO | _PAGE_USER)
111 #define __PAGE_KERNEL_VVAR_NOCACHE (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
112 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
113 #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
114 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
115 
116 #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
117 #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
118 #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
119 #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
120 
121 #define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
122 #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
123 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
124 #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
125 #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
126 #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
127 #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
128 #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
129 #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
130 #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
131 #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
132 #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
133 #define PAGE_KERNEL_VVAR __pgprot(__PAGE_KERNEL_VVAR)
134 #define PAGE_KERNEL_VVAR_NOCACHE __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)
135 
136 #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
137 #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
138 #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
139 #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
140 
141 /* xwr */
142 #define __P000 PAGE_NONE
143 #define __P001 PAGE_READONLY
144 #define __P010 PAGE_COPY
145 #define __P011 PAGE_COPY
146 #define __P100 PAGE_READONLY_EXEC
147 #define __P101 PAGE_READONLY_EXEC
148 #define __P110 PAGE_COPY_EXEC
149 #define __P111 PAGE_COPY_EXEC
150 
151 #define __S000 PAGE_NONE
152 #define __S001 PAGE_READONLY
153 #define __S010 PAGE_SHARED
154 #define __S011 PAGE_SHARED
155 #define __S100 PAGE_READONLY_EXEC
156 #define __S101 PAGE_READONLY_EXEC
157 #define __S110 PAGE_SHARED_EXEC
158 #define __S111 PAGE_SHARED_EXEC
159 
160 /*
161  * early identity mapping pte attrib macros.
162  */
163 #ifdef CONFIG_X86_64
164 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
165 #else
166 /*
167  * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
168  * bits are combined, this will alow user to access the high address mapped
169  * VDSO in the presence of CONFIG_COMPAT_VDSO
170  */
171 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
172 #define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
173 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
174 #endif
175 
176 #ifdef CONFIG_X86_32
177 # include <asm/pgtable_32_types.h>
178 #else
179 # include <asm/pgtable_64_types.h>
180 #endif
181 
182 #ifndef __ASSEMBLY__
183 
184 #include <linux/types.h>
185 
186 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
187 #define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
188 
189 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
190 #define PTE_FLAGS_MASK (~PTE_PFN_MASK)
191 
192 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
193 
194 typedef struct { pgdval_t pgd; } pgd_t;
195 
196 static inline pgd_t native_make_pgd(pgdval_t val)
197 {
198  return (pgd_t) { val };
199 }
200 
201 static inline pgdval_t native_pgd_val(pgd_t pgd)
202 {
203  return pgd.pgd;
204 }
205 
206 static inline pgdval_t pgd_flags(pgd_t pgd)
207 {
208  return native_pgd_val(pgd) & PTE_FLAGS_MASK;
209 }
210 
211 #if PAGETABLE_LEVELS > 3
212 typedef struct { pudval_t pud; } pud_t;
213 
214 static inline pud_t native_make_pud(pmdval_t val)
215 {
216  return (pud_t) { val };
217 }
218 
219 static inline pudval_t native_pud_val(pud_t pud)
220 {
221  return pud.pud;
222 }
223 #else
224 #include <asm-generic/pgtable-nopud.h>
225 
226 static inline pudval_t native_pud_val(pud_t pud)
227 {
228  return native_pgd_val(pud.pgd);
229 }
230 #endif
231 
232 #if PAGETABLE_LEVELS > 2
233 typedef struct { pmdval_t pmd; } pmd_t;
234 
235 static inline pmd_t native_make_pmd(pmdval_t val)
236 {
237  return (pmd_t) { val };
238 }
239 
240 static inline pmdval_t native_pmd_val(pmd_t pmd)
241 {
242  return pmd.pmd;
243 }
244 #else
245 #include <asm-generic/pgtable-nopmd.h>
246 
247 static inline pmdval_t native_pmd_val(pmd_t pmd)
248 {
249  return native_pgd_val(pmd.pud.pgd);
250 }
251 #endif
252 
253 static inline pudval_t pud_flags(pud_t pud)
254 {
255  return native_pud_val(pud) & PTE_FLAGS_MASK;
256 }
257 
258 static inline pmdval_t pmd_flags(pmd_t pmd)
259 {
260  return native_pmd_val(pmd) & PTE_FLAGS_MASK;
261 }
262 
263 static inline pte_t native_make_pte(pteval_t val)
264 {
265  return (pte_t) { .pte = val };
266 }
267 
268 static inline pteval_t native_pte_val(pte_t pte)
269 {
270  return pte.pte;
271 }
272 
273 static inline pteval_t pte_flags(pte_t pte)
274 {
275  return native_pte_val(pte) & PTE_FLAGS_MASK;
276 }
277 
278 #define pgprot_val(x) ((x).pgprot)
279 #define __pgprot(x) ((pgprot_t) { (x) } )
280 
281 
282 typedef struct page *pgtable_t;
283 
284 extern pteval_t __supported_pte_mask;
285 extern void set_nx(void);
286 extern int nx_enabled;
287 
288 #define pgprot_writecombine pgprot_writecombine
289 extern pgprot_t pgprot_writecombine(pgprot_t prot);
290 
291 /* Indicate that x86 has its own track and untrack pfn vma functions */
292 #define __HAVE_PFNMAP_TRACKING
293 
294 #define __HAVE_PHYS_MEM_ACCESS_PROT
295 struct file;
296 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
297  unsigned long size, pgprot_t vma_prot);
298 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
299  unsigned long size, pgprot_t *vma_prot);
300 
301 /* Install a pte for a particular vaddr in kernel space. */
302 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
303 
304 extern void native_pagetable_reserve(u64 start, u64 end);
305 #ifdef CONFIG_X86_32
306 extern void native_pagetable_init(void);
307 #else
308 #define native_pagetable_init paging_init
309 #endif
310 
311 struct seq_file;
312 extern void arch_report_meminfo(struct seq_file *m);
313 
314 enum {
315  PG_LEVEL_NONE,
316  PG_LEVEL_4K,
317  PG_LEVEL_2M,
318  PG_LEVEL_1G,
319  PG_LEVEL_NUM
320 };
321 
322 #ifdef CONFIG_PROC_FS
323 extern void update_page_count(int level, unsigned long pages);
324 #else
325 static inline void update_page_count(int level, unsigned long pages) { }
326 #endif
327 
328 /*
329  * Helper function that returns the kernel pagetable entry controlling
330  * the virtual address 'address'. NULL means no pagetable entry present.
331  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
332  * as a pte too.
333  */
334 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
335 
336 #endif /* !__ASSEMBLY__ */
337 
338 #endif /* _ASM_X86_PGTABLE_DEFS_H */
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