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1965aae3 PA |
1 | #ifndef _ASM_X86_CACHEFLUSH_H |
2 | #define _ASM_X86_CACHEFLUSH_H | |
b2bba72c | 3 | |
b2bba72c | 4 | /* Caches aren't brain-dead on the intel. */ |
cc67ba63 | 5 | #include <asm-generic/cacheflush.h> |
f05e798a | 6 | #include <asm/special_insns.h> |
b2bba72c | 7 | |
f5841740 VP |
8 | #ifdef CONFIG_X86_PAT |
9 | /* | |
10 | * X86 PAT uses page flags WC and Uncached together to keep track of | |
11 | * memory type of pages that have backing page struct. X86 PAT supports 3 | |
12 | * different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and | |
13 | * _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not | |
14 | * been changed from its default (value of -1 used to denote this). | |
15 | * Note we do not support _PAGE_CACHE_UC here. | |
f5841740 | 16 | */ |
1f9cc3cb RH |
17 | |
18 | #define _PGMT_DEFAULT 0 | |
19 | #define _PGMT_WC (1UL << PG_arch_1) | |
20 | #define _PGMT_UC_MINUS (1UL << PG_uncached) | |
21 | #define _PGMT_WB (1UL << PG_uncached | 1UL << PG_arch_1) | |
22 | #define _PGMT_MASK (1UL << PG_uncached | 1UL << PG_arch_1) | |
23 | #define _PGMT_CLEAR_MASK (~_PGMT_MASK) | |
24 | ||
f5841740 VP |
25 | static inline unsigned long get_page_memtype(struct page *pg) |
26 | { | |
1f9cc3cb RH |
27 | unsigned long pg_flags = pg->flags & _PGMT_MASK; |
28 | ||
29 | if (pg_flags == _PGMT_DEFAULT) | |
f5841740 | 30 | return -1; |
1f9cc3cb | 31 | else if (pg_flags == _PGMT_WC) |
f5841740 | 32 | return _PAGE_CACHE_WC; |
1f9cc3cb | 33 | else if (pg_flags == _PGMT_UC_MINUS) |
f5841740 VP |
34 | return _PAGE_CACHE_UC_MINUS; |
35 | else | |
36 | return _PAGE_CACHE_WB; | |
37 | } | |
38 | ||
39 | static inline void set_page_memtype(struct page *pg, unsigned long memtype) | |
40 | { | |
1f9cc3cb RH |
41 | unsigned long memtype_flags = _PGMT_DEFAULT; |
42 | unsigned long old_flags; | |
43 | unsigned long new_flags; | |
44 | ||
f5841740 VP |
45 | switch (memtype) { |
46 | case _PAGE_CACHE_WC: | |
1f9cc3cb | 47 | memtype_flags = _PGMT_WC; |
f5841740 VP |
48 | break; |
49 | case _PAGE_CACHE_UC_MINUS: | |
1f9cc3cb | 50 | memtype_flags = _PGMT_UC_MINUS; |
f5841740 VP |
51 | break; |
52 | case _PAGE_CACHE_WB: | |
1f9cc3cb | 53 | memtype_flags = _PGMT_WB; |
f5841740 VP |
54 | break; |
55 | } | |
1f9cc3cb RH |
56 | |
57 | do { | |
58 | old_flags = pg->flags; | |
59 | new_flags = (old_flags & _PGMT_CLEAR_MASK) | memtype_flags; | |
60 | } while (cmpxchg(&pg->flags, old_flags, new_flags) != old_flags); | |
f5841740 VP |
61 | } |
62 | #else | |
63 | static inline unsigned long get_page_memtype(struct page *pg) { return -1; } | |
64 | static inline void set_page_memtype(struct page *pg, unsigned long memtype) { } | |
65 | #endif | |
75cbade8 | 66 | |
7219bebd AV |
67 | /* |
68 | * The set_memory_* API can be used to change various attributes of a virtual | |
69 | * address range. The attributes include: | |
70 | * Cachability : UnCached, WriteCombining, WriteBack | |
71 | * Executability : eXeutable, NoteXecutable | |
72 | * Read/Write : ReadOnly, ReadWrite | |
73 | * Presence : NotPresent | |
74 | * | |
0d2eb44f | 75 | * Within a category, the attributes are mutually exclusive. |
7219bebd AV |
76 | * |
77 | * The implementation of this API will take care of various aspects that | |
78 | * are associated with changing such attributes, such as: | |
79 | * - Flushing TLBs | |
80 | * - Flushing CPU caches | |
81 | * - Making sure aliases of the memory behind the mapping don't violate | |
82 | * coherency rules as defined by the CPU in the system. | |
83 | * | |
84 | * What this API does not do: | |
85 | * - Provide exclusion between various callers - including callers that | |
86 | * operation on other mappings of the same physical page | |
87 | * - Restore default attributes when a page is freed | |
88 | * - Guarantee that mappings other than the requested one are | |
89 | * in any state, other than that these do not violate rules for | |
90 | * the CPU you have. Do not depend on any effects on other mappings, | |
91 | * CPUs other than the one you have may have more relaxed rules. | |
92 | * The caller is required to take care of these. | |
93 | */ | |
75cbade8 | 94 | |
1219333d | 95 | int _set_memory_uc(unsigned long addr, int numpages); |
ef354af4 | 96 | int _set_memory_wc(unsigned long addr, int numpages); |
1219333d | 97 | int _set_memory_wb(unsigned long addr, int numpages); |
75cbade8 | 98 | int set_memory_uc(unsigned long addr, int numpages); |
ef354af4 | 99 | int set_memory_wc(unsigned long addr, int numpages); |
75cbade8 AV |
100 | int set_memory_wb(unsigned long addr, int numpages); |
101 | int set_memory_x(unsigned long addr, int numpages); | |
102 | int set_memory_nx(unsigned long addr, int numpages); | |
103 | int set_memory_ro(unsigned long addr, int numpages); | |
104 | int set_memory_rw(unsigned long addr, int numpages); | |
f62d0f00 | 105 | int set_memory_np(unsigned long addr, int numpages); |
c9caa02c | 106 | int set_memory_4k(unsigned long addr, int numpages); |
75cbade8 | 107 | |
d75586ad | 108 | int set_memory_array_uc(unsigned long *addr, int addrinarray); |
4f646254 | 109 | int set_memory_array_wc(unsigned long *addr, int addrinarray); |
d75586ad SL |
110 | int set_memory_array_wb(unsigned long *addr, int addrinarray); |
111 | ||
0f350755 | 112 | int set_pages_array_uc(struct page **pages, int addrinarray); |
4f646254 | 113 | int set_pages_array_wc(struct page **pages, int addrinarray); |
0f350755 | 114 | int set_pages_array_wb(struct page **pages, int addrinarray); |
115 | ||
7219bebd AV |
116 | /* |
117 | * For legacy compatibility with the old APIs, a few functions | |
118 | * are provided that work on a "struct page". | |
119 | * These functions operate ONLY on the 1:1 kernel mapping of the | |
120 | * memory that the struct page represents, and internally just | |
121 | * call the set_memory_* function. See the description of the | |
122 | * set_memory_* function for more details on conventions. | |
123 | * | |
124 | * These APIs should be considered *deprecated* and are likely going to | |
125 | * be removed in the future. | |
126 | * The reason for this is the implicit operation on the 1:1 mapping only, | |
127 | * making this not a generally useful API. | |
128 | * | |
129 | * Specifically, many users of the old APIs had a virtual address, | |
130 | * called virt_to_page() or vmalloc_to_page() on that address to | |
131 | * get a struct page* that the old API required. | |
132 | * To convert these cases, use set_memory_*() on the original | |
133 | * virtual address, do not use these functions. | |
134 | */ | |
135 | ||
136 | int set_pages_uc(struct page *page, int numpages); | |
137 | int set_pages_wb(struct page *page, int numpages); | |
138 | int set_pages_x(struct page *page, int numpages); | |
139 | int set_pages_nx(struct page *page, int numpages); | |
140 | int set_pages_ro(struct page *page, int numpages); | |
141 | int set_pages_rw(struct page *page, int numpages); | |
142 | ||
143 | ||
4c61afcd | 144 | void clflush_cache_range(void *addr, unsigned int size); |
b2bba72c | 145 | |
b2bba72c TG |
146 | #ifdef CONFIG_DEBUG_RODATA |
147 | void mark_rodata_ro(void); | |
7bfeab9a | 148 | extern const int rodata_test_data; |
502f6604 | 149 | extern int kernel_set_to_readonly; |
16239630 SR |
150 | void set_kernel_text_rw(void); |
151 | void set_kernel_text_ro(void); | |
152 | #else | |
153 | static inline void set_kernel_text_rw(void) { } | |
154 | static inline void set_kernel_text_ro(void) { } | |
b2bba72c | 155 | #endif |
7bfeab9a | 156 | |
edeed305 | 157 | #ifdef CONFIG_DEBUG_RODATA_TEST |
7bfeab9a | 158 | int rodata_test(void); |
edeed305 | 159 | #else |
7bfeab9a | 160 | static inline int rodata_test(void) |
edeed305 | 161 | { |
7bfeab9a | 162 | return 0; |
edeed305 AV |
163 | } |
164 | #endif | |
b2bba72c | 165 | |
1965aae3 | 166 | #endif /* _ASM_X86_CACHEFLUSH_H */ |