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-rw-r--r--include/asm-x86/pgtable.h359
1 files changed, 359 insertions, 0 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index 1039140652af..cd2524f07452 100644
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -1,5 +1,364 @@
1#ifndef _ASM_X86_PGTABLE_H
2#define _ASM_X86_PGTABLE_H
3
4#define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
5#define FIRST_USER_ADDRESS 0
6
7#define _PAGE_BIT_PRESENT 0
8#define _PAGE_BIT_RW 1
9#define _PAGE_BIT_USER 2
10#define _PAGE_BIT_PWT 3
11#define _PAGE_BIT_PCD 4
12#define _PAGE_BIT_ACCESSED 5
13#define _PAGE_BIT_DIRTY 6
14#define _PAGE_BIT_FILE 6
15#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
16#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
20#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
21
22/*
23 * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
24 * sign-extended value on 32-bit with all 1's in the upper word,
25 * which preserves the upper pte values on 64-bit ptes:
26 */
27#define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT)
28#define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW)
29#define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER)
30#define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT)
31#define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD)
32#define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED)
33#define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY)
34#define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */
35#define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */
36#define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1)
37#define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2)
38#define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3)
39
40#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
41#define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX)
42#else
43#define _PAGE_NX 0
44#endif
45
46/* If _PAGE_PRESENT is clear, we use these: */
47#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping, saved PTE; unset:swap */
48#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
49 pte_present gives true */
50
51#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
52#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
53
54#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
55
56#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
57#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
58
59#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
60#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
61#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
62#define PAGE_COPY PAGE_COPY_NOEXEC
63#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
64#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
65
66#ifdef CONFIG_X86_32
67#define _PAGE_KERNEL_EXEC \
68 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
69#define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)
70
71#ifndef __ASSEMBLY__
72extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
73#endif /* __ASSEMBLY__ */
74#else
75#define __PAGE_KERNEL_EXEC \
76 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
77#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
78#endif
79
80#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
81#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
82#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
83#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
84#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
85#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
86#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
87#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
88
89#ifdef CONFIG_X86_32
90# define MAKE_GLOBAL(x) __pgprot((x))
91#else
92# define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
93#endif
94
95#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
96#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
97#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
98#define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX)
99#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
100#define PAGE_KERNEL_EXEC_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_EXEC_NOCACHE)
101#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
102#define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
103#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
104#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
105
106/* xwr */
107#define __P000 PAGE_NONE
108#define __P001 PAGE_READONLY
109#define __P010 PAGE_COPY
110#define __P011 PAGE_COPY
111#define __P100 PAGE_READONLY_EXEC
112#define __P101 PAGE_READONLY_EXEC
113#define __P110 PAGE_COPY_EXEC
114#define __P111 PAGE_COPY_EXEC
115
116#define __S000 PAGE_NONE
117#define __S001 PAGE_READONLY
118#define __S010 PAGE_SHARED
119#define __S011 PAGE_SHARED
120#define __S100 PAGE_READONLY_EXEC
121#define __S101 PAGE_READONLY_EXEC
122#define __S110 PAGE_SHARED_EXEC
123#define __S111 PAGE_SHARED_EXEC
124
125#ifndef __ASSEMBLY__
126
127/*
128 * ZERO_PAGE is a global shared page that is always zero: used
129 * for zero-mapped memory areas etc..
130 */
131extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
132#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
133
134extern spinlock_t pgd_lock;
135extern struct list_head pgd_list;
136
137/*
138 * The following only work if pte_present() is true.
139 * Undefined behaviour if not..
140 */
141static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
142static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
143static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
144static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
145static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; }
146static inline int pte_global(pte_t pte) { return pte_val(pte) & _PAGE_GLOBAL; }
147static inline int pte_exec(pte_t pte) { return !(pte_val(pte) & _PAGE_NX); }
148
149static inline int pmd_large(pmd_t pte) {
150 return (pmd_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) ==
151 (_PAGE_PSE|_PAGE_PRESENT);
152}
153
154static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY); }
155static inline pte_t pte_mkold(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED); }
156static inline pte_t pte_wrprotect(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW); }
157static inline pte_t pte_mkexec(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX); }
158static inline pte_t pte_mkdirty(pte_t pte) { return __pte(pte_val(pte) | _PAGE_DIRTY); }
159static inline pte_t pte_mkyoung(pte_t pte) { return __pte(pte_val(pte) | _PAGE_ACCESSED); }
160static inline pte_t pte_mkwrite(pte_t pte) { return __pte(pte_val(pte) | _PAGE_RW); }
161static inline pte_t pte_mkhuge(pte_t pte) { return __pte(pte_val(pte) | _PAGE_PSE); }
162static inline pte_t pte_clrhuge(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE); }
163static inline pte_t pte_mkglobal(pte_t pte) { return __pte(pte_val(pte) | _PAGE_GLOBAL); }
164static inline pte_t pte_clrglobal(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL); }
165
166extern pteval_t __supported_pte_mask;
167
168static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
169{
170 return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
171 pgprot_val(pgprot)) & __supported_pte_mask);
172}
173
174static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
175{
176 return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
177 pgprot_val(pgprot)) & __supported_pte_mask);
178}
179
180static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
181{
182 pteval_t val = pte_val(pte);
183
184 /*
185 * Chop off the NX bit (if present), and add the NX portion of
186 * the newprot (if present):
187 */
188 val &= _PAGE_CHG_MASK & ~_PAGE_NX;
189 val |= pgprot_val(newprot) & __supported_pte_mask;
190
191 return __pte(val);
192}
193
194#define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX))
195
196#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
197
198#ifdef CONFIG_PARAVIRT
199#include <asm/paravirt.h>
200#else /* !CONFIG_PARAVIRT */
201#define set_pte(ptep, pte) native_set_pte(ptep, pte)
202#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
203
204#define set_pte_present(mm, addr, ptep, pte) \
205 native_set_pte_present(mm, addr, ptep, pte)
206#define set_pte_atomic(ptep, pte) \
207 native_set_pte_atomic(ptep, pte)
208
209#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
210
211#ifndef __PAGETABLE_PUD_FOLDED
212#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
213#define pgd_clear(pgd) native_pgd_clear(pgd)
214#endif
215
216#ifndef set_pud
217# define set_pud(pudp, pud) native_set_pud(pudp, pud)
218#endif
219
220#ifndef __PAGETABLE_PMD_FOLDED
221#define pud_clear(pud) native_pud_clear(pud)
222#endif
223
224#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
225#define pmd_clear(pmd) native_pmd_clear(pmd)
226
227#define pte_update(mm, addr, ptep) do { } while (0)
228#define pte_update_defer(mm, addr, ptep) do { } while (0)
229#endif /* CONFIG_PARAVIRT */
230
231#endif /* __ASSEMBLY__ */
232
1#ifdef CONFIG_X86_32 233#ifdef CONFIG_X86_32
2# include "pgtable_32.h" 234# include "pgtable_32.h"
3#else 235#else
4# include "pgtable_64.h" 236# include "pgtable_64.h"
5#endif 237#endif
238
239#ifndef __ASSEMBLY__
240
241enum {
242 PG_LEVEL_NONE,
243 PG_LEVEL_4K,
244 PG_LEVEL_2M,
245 PG_LEVEL_1G,
246};
247
248/*
249 * Helper function that returns the kernel pagetable entry controlling
250 * the virtual address 'address'. NULL means no pagetable entry present.
251 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
252 * as a pte too.
253 */
254extern pte_t *lookup_address(unsigned long address, int *level);
255
256/* local pte updates need not use xchg for locking */
257static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
258{
259 pte_t res = *ptep;
260
261 /* Pure native function needs no input for mm, addr */
262 native_pte_clear(NULL, 0, ptep);
263 return res;
264}
265
266static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
267 pte_t *ptep , pte_t pte)
268{
269 native_set_pte(ptep, pte);
270}
271
272#ifndef CONFIG_PARAVIRT
273/*
274 * Rules for using pte_update - it must be called after any PTE update which
275 * has not been done using the set_pte / clear_pte interfaces. It is used by
276 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
277 * updates should either be sets, clears, or set_pte_atomic for P->P
278 * transitions, which means this hook should only be called for user PTEs.
279 * This hook implies a P->P protection or access change has taken place, which
280 * requires a subsequent TLB flush. The notification can optionally be delayed
281 * until the TLB flush event by using the pte_update_defer form of the
282 * interface, but care must be taken to assure that the flush happens while
283 * still holding the same page table lock so that the shadow and primary pages
284 * do not become out of sync on SMP.
285 */
286#define pte_update(mm, addr, ptep) do { } while (0)
287#define pte_update_defer(mm, addr, ptep) do { } while (0)
288#endif
289
290/*
291 * We only update the dirty/accessed state if we set
292 * the dirty bit by hand in the kernel, since the hardware
293 * will do the accessed bit for us, and we don't want to
294 * race with other CPU's that might be updating the dirty
295 * bit at the same time.
296 */
297#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
298#define ptep_set_access_flags(vma, address, ptep, entry, dirty) \
299({ \
300 int __changed = !pte_same(*(ptep), entry); \
301 if (__changed && dirty) { \
302 *ptep = entry; \
303 pte_update_defer((vma)->vm_mm, (address), (ptep)); \
304 flush_tlb_page(vma, address); \
305 } \
306 __changed; \
307})
308
309#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
310#define ptep_test_and_clear_young(vma, addr, ptep) ({ \
311 int __ret = 0; \
312 if (pte_young(*(ptep))) \
313 __ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \
314 &(ptep)->pte); \
315 if (__ret) \
316 pte_update((vma)->vm_mm, addr, ptep); \
317 __ret; \
318})
319
320#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
321#define ptep_clear_flush_young(vma, address, ptep) \
322({ \
323 int __young; \
324 __young = ptep_test_and_clear_young((vma), (address), (ptep)); \
325 if (__young) \
326 flush_tlb_page(vma, address); \
327 __young; \
328})
329
330#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
331static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
332{
333 pte_t pte = native_ptep_get_and_clear(ptep);
334 pte_update(mm, addr, ptep);
335 return pte;
336}
337
338#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
339static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
340{
341 pte_t pte;
342 if (full) {
343 /*
344 * Full address destruction in progress; paravirt does not
345 * care about updates and native needs no locking
346 */
347 pte = native_local_ptep_get_and_clear(ptep);
348 } else {
349 pte = ptep_get_and_clear(mm, addr, ptep);
350 }
351 return pte;
352}
353
354#define __HAVE_ARCH_PTEP_SET_WRPROTECT
355static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
356{
357 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
358 pte_update(mm, addr, ptep);
359}
360
361#include <asm-generic/pgtable.h>
362#endif /* __ASSEMBLY__ */
363
364#endif /* _ASM_X86_PGTABLE_H */
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