blob: 49cbd76b9547ed3d0bf3075f4f6980a0143858c7 [file] [log] [blame]
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +01001#ifndef _ASM_X86_PGTABLE_H
2#define _ASM_X86_PGTABLE_H
3
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_FILE 6
14#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
Andi Kleen9bf5a472008-02-04 16:48:06 +010015#define _PAGE_BIT_PAT 7 /* on 4KB pages */
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010016#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
17#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
18#define _PAGE_BIT_UNUSED2 10
19#define _PAGE_BIT_UNUSED3 11
Andi Kleen9bf5a472008-02-04 16:48:06 +010020#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010021#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
22
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +010023#define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
24#define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
25#define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
26#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
27#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
28#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
29#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
30#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
31#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
32#define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
33#define _PAGE_UNUSED2 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED2)
34#define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
35#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
36#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010037
38#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +010039#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010040#else
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +010041#define _PAGE_NX (_AT(pteval_t, 0))
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010042#endif
43
44/* If _PAGE_PRESENT is clear, we use these: */
Joe Perches3cbaeaf2008-03-23 01:03:12 -070045#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping,
46 * saved PTE; unset:swap */
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010047#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
48 pte_present gives true */
49
Joe Perches3cbaeaf2008-03-23 01:03:12 -070050#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
51 _PAGE_ACCESSED | _PAGE_DIRTY)
52#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
53 _PAGE_DIRTY)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010054
Jeremy Fitzhardinge86aaf4f2008-05-20 08:26:22 +010055/* Set of bits not changed in pte_modify */
Venki Pallipadi1c12c4c2008-05-14 16:05:51 -070056#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_PCD | _PAGE_PWT | \
57 _PAGE_ACCESSED | _PAGE_DIRTY)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010058
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -070059#define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
60#define _PAGE_CACHE_WB (0)
61#define _PAGE_CACHE_WC (_PAGE_PWT)
62#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
63#define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
64
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010065#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
Joe Perches3cbaeaf2008-03-23 01:03:12 -070066#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
67 _PAGE_ACCESSED | _PAGE_NX)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010068
Joe Perches3cbaeaf2008-03-23 01:03:12 -070069#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
70 _PAGE_USER | _PAGE_ACCESSED)
71#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
72 _PAGE_ACCESSED | _PAGE_NX)
73#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
74 _PAGE_ACCESSED)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010075#define PAGE_COPY PAGE_COPY_NOEXEC
Joe Perches3cbaeaf2008-03-23 01:03:12 -070076#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
77 _PAGE_ACCESSED | _PAGE_NX)
78#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
79 _PAGE_ACCESSED)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010080
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010081#define __PAGE_KERNEL_EXEC \
Jeremy Fitzhardinge84906382008-07-01 16:46:35 -070082 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010083#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010084
85#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
86#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
Ingo Molnard2e626f2008-01-30 13:34:04 +010087#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
venkatesh.pallipadi@intel.comb310f381d2008-03-18 17:00:24 -070088#define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010089#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
Suresh Siddhad546b672008-03-25 17:39:12 -070090#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010091#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
92#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
93#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
Jack Steiner3a9e1892008-07-01 14:45:32 -050094#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +010095#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
96
Jeremy Fitzhardinge84906382008-07-01 16:46:35 -070097#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
98#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
99#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
100#define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
101#define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
102#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
103#define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
104#define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
105#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
Jack Steiner3a9e1892008-07-01 14:45:32 -0500106#define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
Jeremy Fitzhardinge84906382008-07-01 16:46:35 -0700107#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
108#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
109#define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +0100110
111/* xwr */
112#define __P000 PAGE_NONE
113#define __P001 PAGE_READONLY
114#define __P010 PAGE_COPY
115#define __P011 PAGE_COPY
116#define __P100 PAGE_READONLY_EXEC
117#define __P101 PAGE_READONLY_EXEC
118#define __P110 PAGE_COPY_EXEC
119#define __P111 PAGE_COPY_EXEC
120
121#define __S000 PAGE_NONE
122#define __S001 PAGE_READONLY
123#define __S010 PAGE_SHARED
124#define __S011 PAGE_SHARED
125#define __S100 PAGE_READONLY_EXEC
126#define __S101 PAGE_READONLY_EXEC
127#define __S110 PAGE_SHARED_EXEC
128#define __S111 PAGE_SHARED_EXEC
129
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100130#ifndef __ASSEMBLY__
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100131
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100132/*
Jeremy Fitzhardinge8405b122008-01-30 13:32:58 +0100133 * ZERO_PAGE is a global shared page that is always zero: used
134 * for zero-mapped memory areas etc..
135 */
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700136extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
Jeremy Fitzhardinge8405b122008-01-30 13:32:58 +0100137#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
138
Jeremy Fitzhardingee3ed9102008-01-30 13:34:11 +0100139extern spinlock_t pgd_lock;
140extern struct list_head pgd_list;
Jeremy Fitzhardinge8405b122008-01-30 13:32:58 +0100141
142/*
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100143 * The following only work if pte_present() is true.
144 * Undefined behaviour if not..
145 */
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700146static inline int pte_dirty(pte_t pte)
147{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100148 return pte_flags(pte) & _PAGE_DIRTY;
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100149}
150
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700151static inline int pte_young(pte_t pte)
152{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100153 return pte_flags(pte) & _PAGE_ACCESSED;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700154}
155
156static inline int pte_write(pte_t pte)
157{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100158 return pte_flags(pte) & _PAGE_RW;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700159}
160
161static inline int pte_file(pte_t pte)
162{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100163 return pte_flags(pte) & _PAGE_FILE;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700164}
165
166static inline int pte_huge(pte_t pte)
167{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100168 return pte_flags(pte) & _PAGE_PSE;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700169}
170
171static inline int pte_global(pte_t pte)
172{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100173 return pte_flags(pte) & _PAGE_GLOBAL;
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700174}
175
176static inline int pte_exec(pte_t pte)
177{
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100178 return !(pte_flags(pte) & _PAGE_NX);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700179}
180
Nick Piggin7e675132008-04-28 02:13:00 -0700181static inline int pte_special(pte_t pte)
182{
183 return 0;
184}
185
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700186static inline int pmd_large(pmd_t pte)
187{
188 return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
189 (_PAGE_PSE | _PAGE_PRESENT);
190}
191
192static inline pte_t pte_mkclean(pte_t pte)
193{
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +0100194 return __pte(pte_val(pte) & ~_PAGE_DIRTY);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700195}
196
197static inline pte_t pte_mkold(pte_t pte)
198{
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +0100199 return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700200}
201
202static inline pte_t pte_wrprotect(pte_t pte)
203{
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +0100204 return __pte(pte_val(pte) & ~_PAGE_RW);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700205}
206
207static inline pte_t pte_mkexec(pte_t pte)
208{
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +0100209 return __pte(pte_val(pte) & ~_PAGE_NX);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700210}
211
212static inline pte_t pte_mkdirty(pte_t pte)
213{
214 return __pte(pte_val(pte) | _PAGE_DIRTY);
215}
216
217static inline pte_t pte_mkyoung(pte_t pte)
218{
219 return __pte(pte_val(pte) | _PAGE_ACCESSED);
220}
221
222static inline pte_t pte_mkwrite(pte_t pte)
223{
224 return __pte(pte_val(pte) | _PAGE_RW);
225}
226
227static inline pte_t pte_mkhuge(pte_t pte)
228{
229 return __pte(pte_val(pte) | _PAGE_PSE);
230}
231
232static inline pte_t pte_clrhuge(pte_t pte)
233{
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +0100234 return __pte(pte_val(pte) & ~_PAGE_PSE);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700235}
236
237static inline pte_t pte_mkglobal(pte_t pte)
238{
239 return __pte(pte_val(pte) | _PAGE_GLOBAL);
240}
241
242static inline pte_t pte_clrglobal(pte_t pte)
243{
Jeremy Fitzhardinge4226ab92008-05-26 23:30:58 +0100244 return __pte(pte_val(pte) & ~_PAGE_GLOBAL);
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700245}
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100246
Nick Piggin7e675132008-04-28 02:13:00 -0700247static inline pte_t pte_mkspecial(pte_t pte)
248{
249 return pte;
250}
251
Jeremy Fitzhardinge6fdc05d2008-01-30 13:32:57 +0100252extern pteval_t __supported_pte_mask;
253
254static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
255{
256 return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
257 pgprot_val(pgprot)) & __supported_pte_mask);
258}
259
260static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
261{
262 return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
263 pgprot_val(pgprot)) & __supported_pte_mask);
264}
265
Ingo Molnar38472312008-01-30 13:32:57 +0100266static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
267{
268 pteval_t val = pte_val(pte);
269
270 /*
271 * Chop off the NX bit (if present), and add the NX portion of
272 * the newprot (if present):
273 */
Venki Pallipadi1c12c4c2008-05-14 16:05:51 -0700274 val &= _PAGE_CHG_MASK;
275 val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
Ingo Molnar38472312008-01-30 13:32:57 +0100276
277 return __pte(val);
278}
279
Venki Pallipadi1c12c4c2008-05-14 16:05:51 -0700280/* mprotect needs to preserve PAT bits when updating vm_page_prot */
281#define pgprot_modify pgprot_modify
282static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
283{
284 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
285 pgprotval_t addbits = pgprot_val(newprot);
286 return __pgprot(preservebits | addbits);
287}
288
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +0100289#define pte_pgprot(x) __pgprot(pte_flags(x) & ~PTE_MASK)
Andi Kleenc6ca18e2008-01-30 13:33:51 +0100290
Andi Kleen1e8e23b2008-01-30 13:33:53 +0100291#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
292
venkatesh.pallipadi@intel.comf0970c12008-03-18 17:00:20 -0700293#ifndef __ASSEMBLY__
294#define __HAVE_PHYS_MEM_ACCESS_PROT
295struct file;
296pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
297 unsigned long size, pgprot_t vma_prot);
298int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
299 unsigned long size, pgprot_t *vma_prot);
300#endif
301
Jeremy Fitzhardinged494a962008-06-17 11:41:59 -0700302/* Install a pte for a particular vaddr in kernel space. */
303void set_pte_vaddr(unsigned long vaddr, pte_t pte);
304
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +0100305#ifdef CONFIG_PARAVIRT
306#include <asm/paravirt.h>
307#else /* !CONFIG_PARAVIRT */
308#define set_pte(ptep, pte) native_set_pte(ptep, pte)
309#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
310
311#define set_pte_present(mm, addr, ptep, pte) \
312 native_set_pte_present(mm, addr, ptep, pte)
313#define set_pte_atomic(ptep, pte) \
314 native_set_pte_atomic(ptep, pte)
315
316#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
317
318#ifndef __PAGETABLE_PUD_FOLDED
319#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
320#define pgd_clear(pgd) native_pgd_clear(pgd)
321#endif
322
323#ifndef set_pud
324# define set_pud(pudp, pud) native_set_pud(pudp, pud)
325#endif
326
327#ifndef __PAGETABLE_PMD_FOLDED
328#define pud_clear(pud) native_pud_clear(pud)
329#endif
330
331#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
332#define pmd_clear(pmd) native_pmd_clear(pmd)
333
334#define pte_update(mm, addr, ptep) do { } while (0)
335#define pte_update_defer(mm, addr, ptep) do { } while (0)
336#endif /* CONFIG_PARAVIRT */
337
Jeremy Fitzhardinge46141392008-01-30 13:32:56 +0100338#endif /* __ASSEMBLY__ */
339
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200340#ifdef CONFIG_X86_32
341# include "pgtable_32.h"
342#else
343# include "pgtable_64.h"
344#endif
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +0100345
Jeremy Fitzhardingefb15a9b2008-06-25 00:19:06 -0400346/*
347 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
348 *
349 * this macro returns the index of the entry in the pgd page which would
350 * control the given virtual address
351 */
352#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
353
354/*
355 * pgd_offset() returns a (pgd_t *)
356 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
357 */
358#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
359/*
360 * a shortcut which implies the use of the kernel's pgd, instead
361 * of a process's
362 */
363#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
364
365
Jeremy Fitzhardinge68db0652008-03-17 16:37:13 -0700366#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
367#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
368
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100369#ifndef __ASSEMBLY__
370
Thomas Gleixner30551bb2008-01-30 13:34:04 +0100371enum {
372 PG_LEVEL_NONE,
373 PG_LEVEL_4K,
374 PG_LEVEL_2M,
Ingo Molnar86f03982008-01-30 13:34:09 +0100375 PG_LEVEL_1G,
Andi Kleence0c0e52008-05-02 11:46:49 +0200376 PG_LEVEL_NUM
Thomas Gleixner30551bb2008-01-30 13:34:04 +0100377};
378
Thomas Gleixner65280e62008-05-05 16:35:21 +0200379#ifdef CONFIG_PROC_FS
380extern void update_page_count(int level, unsigned long pages);
381#else
382static inline void update_page_count(int level, unsigned long pages) { }
383#endif
Andi Kleence0c0e52008-05-02 11:46:49 +0200384
Thomas Gleixner0a663082008-01-30 13:34:04 +0100385/*
386 * Helper function that returns the kernel pagetable entry controlling
387 * the virtual address 'address'. NULL means no pagetable entry present.
388 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
389 * as a pte too.
390 */
Harvey Harrisonda7bfc52008-02-09 23:24:08 +0100391extern pte_t *lookup_address(unsigned long address, unsigned int *level);
Thomas Gleixner0a663082008-01-30 13:34:04 +0100392
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +0100393/* local pte updates need not use xchg for locking */
394static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
395{
396 pte_t res = *ptep;
397
398 /* Pure native function needs no input for mm, addr */
399 native_pte_clear(NULL, 0, ptep);
400 return res;
401}
402
403static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
404 pte_t *ptep , pte_t pte)
405{
406 native_set_pte(ptep, pte);
407}
408
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100409#ifndef CONFIG_PARAVIRT
410/*
411 * Rules for using pte_update - it must be called after any PTE update which
412 * has not been done using the set_pte / clear_pte interfaces. It is used by
413 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
414 * updates should either be sets, clears, or set_pte_atomic for P->P
415 * transitions, which means this hook should only be called for user PTEs.
416 * This hook implies a P->P protection or access change has taken place, which
417 * requires a subsequent TLB flush. The notification can optionally be delayed
418 * until the TLB flush event by using the pte_update_defer form of the
419 * interface, but care must be taken to assure that the flush happens while
420 * still holding the same page table lock so that the shadow and primary pages
421 * do not become out of sync on SMP.
422 */
423#define pte_update(mm, addr, ptep) do { } while (0)
424#define pte_update_defer(mm, addr, ptep) do { } while (0)
425#endif
426
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100427/*
428 * We only update the dirty/accessed state if we set
429 * the dirty bit by hand in the kernel, since the hardware
430 * will do the accessed bit for us, and we don't want to
431 * race with other CPU's that might be updating the dirty
432 * bit at the same time.
433 */
Jeremy Fitzhardingebea41802008-06-25 00:18:57 -0400434struct vm_area_struct;
435
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100436#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
Jeremy Fitzhardingeee5aa8d2008-03-17 16:37:03 -0700437extern int ptep_set_access_flags(struct vm_area_struct *vma,
438 unsigned long address, pte_t *ptep,
439 pte_t entry, int dirty);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100440
441#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
Jeremy Fitzhardingef9fbf1a2008-03-17 16:37:04 -0700442extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
443 unsigned long addr, pte_t *ptep);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100444
445#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
Jeremy Fitzhardingec20311e2008-03-17 16:37:05 -0700446extern int ptep_clear_flush_young(struct vm_area_struct *vma,
447 unsigned long address, pte_t *ptep);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100448
449#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700450static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
451 pte_t *ptep)
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100452{
453 pte_t pte = native_ptep_get_and_clear(ptep);
454 pte_update(mm, addr, ptep);
455 return pte;
456}
457
458#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700459static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
460 unsigned long addr, pte_t *ptep,
461 int full)
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100462{
463 pte_t pte;
464 if (full) {
465 /*
466 * Full address destruction in progress; paravirt does not
467 * care about updates and native needs no locking
468 */
469 pte = native_local_ptep_get_and_clear(ptep);
470 } else {
471 pte = ptep_get_and_clear(mm, addr, ptep);
472 }
473 return pte;
474}
475
476#define __HAVE_ARCH_PTEP_SET_WRPROTECT
Joe Perches3cbaeaf2008-03-23 01:03:12 -0700477static inline void ptep_set_wrprotect(struct mm_struct *mm,
478 unsigned long addr, pte_t *ptep)
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100479{
Jeremy Fitzhardinged8d89822008-01-30 13:32:58 +0100480 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100481 pte_update(mm, addr, ptep);
482}
483
Jeremy Fitzhardinge85958b42008-03-17 16:37:14 -0700484/*
485 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
486 *
487 * dst - pointer to pgd range anwhere on a pgd page
488 * src - ""
489 * count - the number of pgds to copy.
490 *
491 * dst and src can be on the same page, but the range must not overlap,
492 * and must not cross a page boundary.
493 */
494static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
495{
496 memcpy(dst, src, count * sizeof(pgd_t));
497}
498
499
Jeremy Fitzhardinge195466d2008-01-30 13:32:58 +0100500#include <asm-generic/pgtable.h>
501#endif /* __ASSEMBLY__ */
502
Jeremy Fitzhardinge6c386652008-01-30 13:32:55 +0100503#endif /* _ASM_X86_PGTABLE_H */