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H. Peter Anvin1965aae2008-10-22 22:26:29 -07001#ifndef _ASM_X86_PGTABLE_H
2#define _ASM_X86_PGTABLE_H
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +01003
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +01004#define FIRST_USER_ADDRESS 0
5
Jiri Slaby43cdf5d2008-03-22 18:50:22 +01006#define _PAGE_BIT_PRESENT 0 /* is present */
7#define _PAGE_BIT_RW 1 /* writeable */
8#define _PAGE_BIT_USER 2 /* userspace addressable */
9#define _PAGE_BIT_PWT 3 /* page write through */
10#define _PAGE_BIT_PCD 4 /* page cache disabled */
11#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
12#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010013#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
Andi Kleen9bf5a472008-02-04 16:48:06 +010014#define _PAGE_BIT_PAT 7 /* on 4KB pages */
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010015#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
16#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
Jeremy Fitzhardingebe43d722008-09-07 15:21:13 -070017#define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010018#define _PAGE_BIT_UNUSED3 11
Andi Kleen9bf5a472008-02-04 16:48:06 +010019#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
Nick Piggina0a8f532008-07-25 19:45:20 -070020#define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
Jeremy Fitzhardinge110e0352008-08-28 13:58:39 -070021#define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010022#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
23
Jan Beulich17963162008-12-16 11:35:24 +000024/* If _PAGE_BIT_PRESENT is clear, we use these: */
25/* - if the user mapped it with PROT_NONE; pte_present gives true */
26#define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
27/* - set: nonlinear file mapping, saved PTE; unset:swap */
28#define _PAGE_BIT_FILE _PAGE_BIT_DIRTY
29
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +010030#define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
31#define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
32#define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
33#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
34#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
35#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
36#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
37#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
38#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
39#define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
Jeremy Fitzhardingebe43d722008-09-07 15:21:13 -070040#define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +010041#define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
42#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
43#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
Nick Piggina0a8f532008-07-25 19:45:20 -070044#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
Jeremy Fitzhardinge110e0352008-08-28 13:58:39 -070045#define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
Nick Piggina0a8f532008-07-25 19:45:20 -070046#define __HAVE_ARCH_PTE_SPECIAL
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010047
48#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +010049#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010050#else
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +010051#define _PAGE_NX (_AT(pteval_t, 0))
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010052#endif
53
Jan Beulich17963162008-12-16 11:35:24 +000054#define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
55#define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010056
Joe Perches3cbaeaf2008-03-23 01:03:12 -070057#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
58 _PAGE_ACCESSED | _PAGE_DIRTY)
59#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
60 _PAGE_DIRTY)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010061
Jeremy Fitzhardinge86aaf4f2008-05-20 08:26:22 +010062/* Set of bits not changed in pte_modify */
Jeremy Fitzhardinge59438c92008-07-21 22:59:42 -070063#define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
Nick Piggina0a8f532008-07-25 19:45:20 -070064 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010065
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -070066#define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
67#define _PAGE_CACHE_WB (0)
68#define _PAGE_CACHE_WC (_PAGE_PWT)
69#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
70#define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
71
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010072#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
Joe Perches3cbaeaf2008-03-23 01:03:12 -070073#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
74 _PAGE_ACCESSED | _PAGE_NX)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010075
Joe Perches3cbaeaf2008-03-23 01:03:12 -070076#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
77 _PAGE_USER | _PAGE_ACCESSED)
78#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
79 _PAGE_ACCESSED | _PAGE_NX)
80#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
81 _PAGE_ACCESSED)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010082#define PAGE_COPY PAGE_COPY_NOEXEC
Joe Perches3cbaeaf2008-03-23 01:03:12 -070083#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
84 _PAGE_ACCESSED | _PAGE_NX)
85#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
86 _PAGE_ACCESSED)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010087
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010088#define __PAGE_KERNEL_EXEC \
Jeremy Fitzhardinge84906382008-07-01 16:46:35 -070089 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010090#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010091
92#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
93#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
Ingo Molnard2e626f2008-01-30 13:34:04 +010094#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
venkatesh.pallipadi@intel.comb310f382008-03-18 17:00:24 -070095#define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010096#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
Suresh Siddhad546b672008-03-25 17:39:12 -070097#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010098#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
99#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
100#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
Jack Steiner3a9e1892008-07-01 14:45:32 -0500101#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +0100102#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
103
Jeremy Fitzhardingebe43d722008-09-07 15:21:13 -0700104#define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
105#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
106#define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
107#define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
108
Jeremy Fitzhardinge84906382008-07-01 16:46:35 -0700109#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
110#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
111#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
112#define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
113#define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
114#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
115#define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
116#define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
117#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
Jack Steiner3a9e1892008-07-01 14:45:32 -0500118#define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
Jeremy Fitzhardinge84906382008-07-01 16:46:35 -0700119#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
120#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
121#define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +0100122
Jeremy Fitzhardingebe43d722008-09-07 15:21:13 -0700123#define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
124#define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
125#define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
126#define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
127
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +0100128/* xwr */
129#define __P000 PAGE_NONE
130#define __P001 PAGE_READONLY
131#define __P010 PAGE_COPY
132#define __P011 PAGE_COPY
133#define __P100 PAGE_READONLY_EXEC
134#define __P101 PAGE_READONLY_EXEC
135#define __P110 PAGE_COPY_EXEC
136#define __P111 PAGE_COPY_EXEC
137
138#define __S000 PAGE_NONE
139#define __S001 PAGE_READONLY
140#define __S010 PAGE_SHARED
141#define __S011 PAGE_SHARED
142#define __S100 PAGE_READONLY_EXEC
143#define __S101 PAGE_READONLY_EXEC
144#define __S110 PAGE_SHARED_EXEC
145#define __S111 PAGE_SHARED_EXEC
146
Suresh Siddhab2bc2732008-09-23 14:00:36 -0700147/*
148 * early identity mapping pte attrib macros.
149 */
150#ifdef CONFIG_X86_64
151#define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
152#else
Suresh Siddhaf61f1b52008-10-15 07:46:27 -0700153/*
154 * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
155 * bits are combined, this will alow user to access the high address mapped
156 * VDSO in the presence of CONFIG_COMPAT_VDSO
157 */
Suresh Siddha3a85e772008-09-23 14:00:37 -0700158#define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
Suresh Siddhaf61f1b52008-10-15 07:46:27 -0700159#define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
Suresh Siddhab2bc2732008-09-23 14:00:36 -0700160#define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
161#endif
162
venkatesh.pallipadi@intel.com8a7b12f2008-12-18 11:41:31 -0800163/*
164 * Macro to mark a page protection value as UC-
165 */
166#define pgprot_noncached(prot) \
167 ((boot_cpu_data.x86 > 3) \
168 ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS)) \
169 : (prot))
170
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100171#ifndef __ASSEMBLY__
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100172
venkatesh.pallipadi@intel.com2520bd32008-12-18 11:41:32 -0800173#define pgprot_writecombine pgprot_writecombine
174extern pgprot_t pgprot_writecombine(pgprot_t prot);
175
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100176/*
Jeremy Fitzhardinge8405b122008-01-30 13:32:58 +0100177 * ZERO_PAGE is a global shared page that is always zero: used
178 * for zero-mapped memory areas etc..
179 */
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700180extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
Jeremy Fitzhardinge8405b122008-01-30 13:32:58 +0100181#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
182
Jeremy Fitzhardingee3ed9102008-01-30 13:34:11 +0100183extern spinlock_t pgd_lock;
184extern struct list_head pgd_list;
Jeremy Fitzhardinge8405b122008-01-30 13:32:58 +0100185
186/*
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100187 * The following only work if pte_present() is true.
188 * Undefined behaviour if not..
189 */
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700190static inline int pte_dirty(pte_t pte)
191{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100192 return pte_flags(pte) & _PAGE_DIRTY;
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100193}
194
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700195static inline int pte_young(pte_t pte)
196{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100197 return pte_flags(pte) & _PAGE_ACCESSED;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700198}
199
200static inline int pte_write(pte_t pte)
201{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100202 return pte_flags(pte) & _PAGE_RW;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700203}
204
205static inline int pte_file(pte_t pte)
206{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100207 return pte_flags(pte) & _PAGE_FILE;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700208}
209
210static inline int pte_huge(pte_t pte)
211{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100212 return pte_flags(pte) & _PAGE_PSE;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700213}
214
215static inline int pte_global(pte_t pte)
216{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100217 return pte_flags(pte) & _PAGE_GLOBAL;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700218}
219
220static inline int pte_exec(pte_t pte)
221{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100222 return !(pte_flags(pte) & _PAGE_NX);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700223}
224
Nick Piggin7e675132008-04-28 02:13:00 -0700225static inline int pte_special(pte_t pte)
226{
Jan Beulich606ee442008-09-17 16:48:17 +0100227 return pte_flags(pte) & _PAGE_SPECIAL;
Nick Piggin7e675132008-04-28 02:13:00 -0700228}
229
Hugh Dickins91030ca2008-09-09 16:42:45 +0100230static inline unsigned long pte_pfn(pte_t pte)
231{
232 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
233}
234
235#define pte_page(pte) pfn_to_page(pte_pfn(pte))
236
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700237static inline int pmd_large(pmd_t pte)
238{
239 return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
240 (_PAGE_PSE | _PAGE_PRESENT);
241}
242
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800243static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
244{
245 pteval_t v = native_pte_val(pte);
246
247 return native_make_pte(v | set);
248}
249
250static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
251{
252 pteval_t v = native_pte_val(pte);
253
254 return native_make_pte(v & ~clear);
255}
256
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700257static inline pte_t pte_mkclean(pte_t pte)
258{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800259 return pte_clear_flags(pte, _PAGE_DIRTY);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700260}
261
262static inline pte_t pte_mkold(pte_t pte)
263{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800264 return pte_clear_flags(pte, _PAGE_ACCESSED);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700265}
266
267static inline pte_t pte_wrprotect(pte_t pte)
268{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800269 return pte_clear_flags(pte, _PAGE_RW);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700270}
271
272static inline pte_t pte_mkexec(pte_t pte)
273{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800274 return pte_clear_flags(pte, _PAGE_NX);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700275}
276
277static inline pte_t pte_mkdirty(pte_t pte)
278{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800279 return pte_set_flags(pte, _PAGE_DIRTY);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700280}
281
282static inline pte_t pte_mkyoung(pte_t pte)
283{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800284 return pte_set_flags(pte, _PAGE_ACCESSED);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700285}
286
287static inline pte_t pte_mkwrite(pte_t pte)
288{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800289 return pte_set_flags(pte, _PAGE_RW);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700290}
291
292static inline pte_t pte_mkhuge(pte_t pte)
293{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800294 return pte_set_flags(pte, _PAGE_PSE);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700295}
296
297static inline pte_t pte_clrhuge(pte_t pte)
298{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800299 return pte_clear_flags(pte, _PAGE_PSE);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700300}
301
302static inline pte_t pte_mkglobal(pte_t pte)
303{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800304 return pte_set_flags(pte, _PAGE_GLOBAL);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700305}
306
307static inline pte_t pte_clrglobal(pte_t pte)
308{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800309 return pte_clear_flags(pte, _PAGE_GLOBAL);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700310}
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100311
Nick Piggin7e675132008-04-28 02:13:00 -0700312static inline pte_t pte_mkspecial(pte_t pte)
313{
Jeremy Fitzhardinge65228692009-01-22 14:24:22 -0800314 return pte_set_flags(pte, _PAGE_SPECIAL);
Nick Piggin7e675132008-04-28 02:13:00 -0700315}
316
Jeremy Fitzhardinge6fdc05d2008-01-30 13:32:57 +0100317extern pteval_t __supported_pte_mask;
318
Jeremy Fitzhardingeb5348162009-02-04 18:33:38 -0800319/*
320 * Mask out unsupported bits in a present pgprot. Non-present pgprots
321 * can use those bits for other purposes, so leave them be.
322 */
323static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
324{
325 pgprotval_t protval = pgprot_val(pgprot);
326
327 if (protval & _PAGE_PRESENT)
328 protval &= __supported_pte_mask;
329
330 return protval;
331}
332
Jeremy Fitzhardinge6fdc05d2008-01-30 13:32:57 +0100333static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
334{
Jeremy Fitzhardingeb5348162009-02-04 18:33:38 -0800335 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
336 massage_pgprot(pgprot));
Jeremy Fitzhardinge6fdc05d2008-01-30 13:32:57 +0100337}
338
339static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
340{
Jeremy Fitzhardingeb5348162009-02-04 18:33:38 -0800341 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
342 massage_pgprot(pgprot));
Jeremy Fitzhardinge6fdc05d2008-01-30 13:32:57 +0100343}
344
Ingo Molnar38472312008-01-30 13:32:57 +0100345static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
346{
347 pteval_t val = pte_val(pte);
348
349 /*
350 * Chop off the NX bit (if present), and add the NX portion of
351 * the newprot (if present):
352 */
Venki Pallipadi1c12c4c2008-05-14 16:05:51 -0700353 val &= _PAGE_CHG_MASK;
Jeremy Fitzhardingeb5348162009-02-04 18:33:38 -0800354 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
Ingo Molnar38472312008-01-30 13:32:57 +0100355
356 return __pte(val);
357}
358
Venki Pallipadi1c12c4c2008-05-14 16:05:51 -0700359/* mprotect needs to preserve PAT bits when updating vm_page_prot */
360#define pgprot_modify pgprot_modify
361static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
362{
363 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
364 pgprotval_t addbits = pgprot_val(newprot);
365 return __pgprot(preservebits | addbits);
366}
367
Jeremy Fitzhardinge77be1fa2008-07-21 22:59:56 -0700368#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
Andi Kleenc6ca18e2008-01-30 13:33:51 +0100369
Jeremy Fitzhardingeb5348162009-02-04 18:33:38 -0800370#define canon_pgprot(p) __pgprot(massage_pgprot(p))
Andi Kleen1e8e23b2008-01-30 13:33:53 +0100371
venkatesh.pallipadi@intel.comafc7d202009-01-09 16:13:10 -0800372static inline int is_new_memtype_allowed(unsigned long flags,
373 unsigned long new_flags)
374{
375 /*
376 * Certain new memtypes are not allowed with certain
377 * requested memtype:
378 * - request is uncached, return cannot be write-back
379 * - request is write-combine, return cannot be write-back
380 */
381 if ((flags == _PAGE_CACHE_UC_MINUS &&
382 new_flags == _PAGE_CACHE_WB) ||
383 (flags == _PAGE_CACHE_WC &&
384 new_flags == _PAGE_CACHE_WB)) {
385 return 0;
386 }
387
388 return 1;
389}
390
venkatesh.pallipadi@intel.comf0970c12008-03-18 17:00:20 -0700391#ifndef __ASSEMBLY__
venkatesh.pallipadi@intel.com34801ba2008-12-19 13:47:29 -0800392/* Indicate that x86 has its own track and untrack pfn vma functions */
393#define __HAVE_PFNMAP_TRACKING
394
venkatesh.pallipadi@intel.comf0970c12008-03-18 17:00:20 -0700395#define __HAVE_PHYS_MEM_ACCESS_PROT
396struct file;
397pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
398 unsigned long size, pgprot_t vma_prot);
399int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
400 unsigned long size, pgprot_t *vma_prot);
401#endif
402
Jeremy Fitzhardinged494a962008-06-17 11:41:59 -0700403/* Install a pte for a particular vaddr in kernel space. */
404void set_pte_vaddr(unsigned long vaddr, pte_t pte);
Tejun Heo458a3e62009-02-24 11:57:21 +0900405pmd_t *populate_extra_pmd(unsigned long vaddr);
406pte_t *populate_extra_pte(unsigned long vaddr);
Jeremy Fitzhardinged494a962008-06-17 11:41:59 -0700407
Eduardo Habkosta312b372008-07-08 15:06:23 -0700408#ifdef CONFIG_X86_32
409extern void native_pagetable_setup_start(pgd_t *base);
410extern void native_pagetable_setup_done(pgd_t *base);
411#else
412static inline void native_pagetable_setup_start(pgd_t *base) {}
413static inline void native_pagetable_setup_done(pgd_t *base) {}
414#endif
415
Linus Torvalds88ed86f2008-10-23 12:04:37 -0700416struct seq_file;
417extern void arch_report_meminfo(struct seq_file *m);
Jaswinder Singhe0b7c812008-07-23 17:40:34 +0530418
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +0100419#ifdef CONFIG_PARAVIRT
420#include <asm/paravirt.h>
421#else /* !CONFIG_PARAVIRT */
422#define set_pte(ptep, pte) native_set_pte(ptep, pte)
423#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
424
425#define set_pte_present(mm, addr, ptep, pte) \
426 native_set_pte_present(mm, addr, ptep, pte)
427#define set_pte_atomic(ptep, pte) \
428 native_set_pte_atomic(ptep, pte)
429
430#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
431
432#ifndef __PAGETABLE_PUD_FOLDED
433#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
434#define pgd_clear(pgd) native_pgd_clear(pgd)
435#endif
436
437#ifndef set_pud
438# define set_pud(pudp, pud) native_set_pud(pudp, pud)
439#endif
440
441#ifndef __PAGETABLE_PMD_FOLDED
442#define pud_clear(pud) native_pud_clear(pud)
443#endif
444
445#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
446#define pmd_clear(pmd) native_pmd_clear(pmd)
447
448#define pte_update(mm, addr, ptep) do { } while (0)
449#define pte_update_defer(mm, addr, ptep) do { } while (0)
Eduardo Habkosta312b372008-07-08 15:06:23 -0700450
451static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
452{
453 native_pagetable_setup_start(base);
454}
455
456static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
457{
458 native_pagetable_setup_done(base);
459}
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +0100460#endif /* CONFIG_PARAVIRT */
461
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100462#endif /* __ASSEMBLY__ */
463
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200464#ifdef CONFIG_X86_32
465# include "pgtable_32.h"
466#else
467# include "pgtable_64.h"
468#endif
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +0100469
Jeremy Fitzhardingefb15a9b2008-06-25 00:19:06 -0400470/*
471 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
472 *
473 * this macro returns the index of the entry in the pgd page which would
474 * control the given virtual address
475 */
476#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
477
478/*
479 * pgd_offset() returns a (pgd_t *)
480 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
481 */
482#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
483/*
484 * a shortcut which implies the use of the kernel's pgd, instead
485 * of a process's
486 */
487#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
488
489
Jeremy Fitzhardinge68db0652008-03-17 16:37:13 -0700490#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
491#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
492
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100493#ifndef __ASSEMBLY__
494
Thomas Gleixner30551bb2008-01-30 13:34:04 +0100495enum {
496 PG_LEVEL_NONE,
497 PG_LEVEL_4K,
498 PG_LEVEL_2M,
Ingo Molnar86f03982008-01-30 13:34:09 +0100499 PG_LEVEL_1G,
Andi Kleence0c0e52008-05-02 11:46:49 +0200500 PG_LEVEL_NUM
Thomas Gleixner30551bb2008-01-30 13:34:04 +0100501};
502
Thomas Gleixner65280e62008-05-05 16:35:21 +0200503#ifdef CONFIG_PROC_FS
504extern void update_page_count(int level, unsigned long pages);
505#else
506static inline void update_page_count(int level, unsigned long pages) { }
507#endif
Andi Kleence0c0e52008-05-02 11:46:49 +0200508
Thomas Gleixner0a663082008-01-30 13:34:04 +0100509/*
510 * Helper function that returns the kernel pagetable entry controlling
511 * the virtual address 'address'. NULL means no pagetable entry present.
512 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
513 * as a pte too.
514 */
Harvey Harrisonda7bfc52008-02-09 23:24:08 +0100515extern pte_t *lookup_address(unsigned long address, unsigned int *level);
Thomas Gleixner0a663082008-01-30 13:34:04 +0100516
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +0100517/* local pte updates need not use xchg for locking */
518static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
519{
520 pte_t res = *ptep;
521
522 /* Pure native function needs no input for mm, addr */
523 native_pte_clear(NULL, 0, ptep);
524 return res;
525}
526
527static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
528 pte_t *ptep , pte_t pte)
529{
530 native_set_pte(ptep, pte);
531}
532
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100533#ifndef CONFIG_PARAVIRT
534/*
535 * Rules for using pte_update - it must be called after any PTE update which
536 * has not been done using the set_pte / clear_pte interfaces. It is used by
537 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
538 * updates should either be sets, clears, or set_pte_atomic for P->P
539 * transitions, which means this hook should only be called for user PTEs.
540 * This hook implies a P->P protection or access change has taken place, which
541 * requires a subsequent TLB flush. The notification can optionally be delayed
542 * until the TLB flush event by using the pte_update_defer form of the
543 * interface, but care must be taken to assure that the flush happens while
544 * still holding the same page table lock so that the shadow and primary pages
545 * do not become out of sync on SMP.
546 */
547#define pte_update(mm, addr, ptep) do { } while (0)
548#define pte_update_defer(mm, addr, ptep) do { } while (0)
549#endif
550
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100551/*
552 * We only update the dirty/accessed state if we set
553 * the dirty bit by hand in the kernel, since the hardware
554 * will do the accessed bit for us, and we don't want to
555 * race with other CPU's that might be updating the dirty
556 * bit at the same time.
557 */
Jeremy Fitzhardingebea41802008-06-25 00:18:57 -0400558struct vm_area_struct;
559
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100560#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
Jeremy Fitzhardingeee5aa8d2008-03-17 16:37:03 -0700561extern int ptep_set_access_flags(struct vm_area_struct *vma,
562 unsigned long address, pte_t *ptep,
563 pte_t entry, int dirty);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100564
565#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
Jeremy Fitzhardingef9fbf1a2008-03-17 16:37:04 -0700566extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
567 unsigned long addr, pte_t *ptep);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100568
569#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
Jeremy Fitzhardingec20311e2008-03-17 16:37:05 -0700570extern int ptep_clear_flush_young(struct vm_area_struct *vma,
571 unsigned long address, pte_t *ptep);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100572
573#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700574static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
575 pte_t *ptep)
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100576{
577 pte_t pte = native_ptep_get_and_clear(ptep);
578 pte_update(mm, addr, ptep);
579 return pte;
580}
581
582#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700583static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
584 unsigned long addr, pte_t *ptep,
585 int full)
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100586{
587 pte_t pte;
588 if (full) {
589 /*
590 * Full address destruction in progress; paravirt does not
591 * care about updates and native needs no locking
592 */
593 pte = native_local_ptep_get_and_clear(ptep);
594 } else {
595 pte = ptep_get_and_clear(mm, addr, ptep);
596 }
597 return pte;
598}
599
600#define __HAVE_ARCH_PTEP_SET_WRPROTECT
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700601static inline void ptep_set_wrprotect(struct mm_struct *mm,
602 unsigned long addr, pte_t *ptep)
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100603{
Jeremy Fitzhardinged8d89822008-01-30 13:32:58 +0100604 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100605 pte_update(mm, addr, ptep);
606}
607
Jeremy Fitzhardinge85958b42008-03-17 16:37:14 -0700608/*
609 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
610 *
611 * dst - pointer to pgd range anwhere on a pgd page
612 * src - ""
613 * count - the number of pgds to copy.
614 *
615 * dst and src can be on the same page, but the range must not overlap,
616 * and must not cross a page boundary.
617 */
618static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
619{
620 memcpy(dst, src, count * sizeof(pgd_t));
621}
622
623
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100624#include <asm-generic/pgtable.h>
625#endif /* __ASSEMBLY__ */
626
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700627#endif /* _ASM_X86_PGTABLE_H */