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1965aae3 PA |
1 | #ifndef _ASM_X86_CACHEFLUSH_H |
2 | #define _ASM_X86_CACHEFLUSH_H | |
b2bba72c TG |
3 | |
4 | /* Keep includes the same across arches. */ | |
5 | #include <linux/mm.h> | |
6 | ||
7 | /* Caches aren't brain-dead on the intel. */ | |
d3251005 TH |
8 | static inline void flush_cache_all(void) { } |
9 | static inline void flush_cache_mm(struct mm_struct *mm) { } | |
10 | static inline void flush_cache_dup_mm(struct mm_struct *mm) { } | |
11 | static inline void flush_cache_range(struct vm_area_struct *vma, | |
12 | unsigned long start, unsigned long end) { } | |
13 | static inline void flush_cache_page(struct vm_area_struct *vma, | |
14 | unsigned long vmaddr, unsigned long pfn) { } | |
2d4dc890 | 15 | #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 |
d3251005 TH |
16 | static inline void flush_dcache_page(struct page *page) { } |
17 | static inline void flush_dcache_mmap_lock(struct address_space *mapping) { } | |
18 | static inline void flush_dcache_mmap_unlock(struct address_space *mapping) { } | |
19 | static inline void flush_icache_range(unsigned long start, | |
20 | unsigned long end) { } | |
21 | static inline void flush_icache_page(struct vm_area_struct *vma, | |
22 | struct page *page) { } | |
23 | static inline void flush_icache_user_range(struct vm_area_struct *vma, | |
24 | struct page *page, | |
25 | unsigned long addr, | |
26 | unsigned long len) { } | |
27 | static inline void flush_cache_vmap(unsigned long start, unsigned long end) { } | |
28 | static inline void flush_cache_vunmap(unsigned long start, | |
29 | unsigned long end) { } | |
b2bba72c | 30 | |
d3251005 TH |
31 | static inline void copy_to_user_page(struct vm_area_struct *vma, |
32 | struct page *page, unsigned long vaddr, | |
33 | void *dst, const void *src, | |
34 | unsigned long len) | |
35 | { | |
36 | memcpy(dst, src, len); | |
37 | } | |
38 | ||
39 | static inline void copy_from_user_page(struct vm_area_struct *vma, | |
40 | struct page *page, unsigned long vaddr, | |
41 | void *dst, const void *src, | |
42 | unsigned long len) | |
43 | { | |
44 | memcpy(dst, src, len); | |
45 | } | |
b2bba72c | 46 | |
f5841740 VP |
47 | #define PG_WC PG_arch_1 |
48 | PAGEFLAG(WC, WC) | |
49 | ||
50 | #ifdef CONFIG_X86_PAT | |
51 | /* | |
52 | * X86 PAT uses page flags WC and Uncached together to keep track of | |
53 | * memory type of pages that have backing page struct. X86 PAT supports 3 | |
54 | * different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and | |
55 | * _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not | |
56 | * been changed from its default (value of -1 used to denote this). | |
57 | * Note we do not support _PAGE_CACHE_UC here. | |
58 | * | |
59 | * Caller must hold memtype_lock for atomicity. | |
60 | */ | |
61 | static inline unsigned long get_page_memtype(struct page *pg) | |
62 | { | |
63 | if (!PageUncached(pg) && !PageWC(pg)) | |
64 | return -1; | |
65 | else if (!PageUncached(pg) && PageWC(pg)) | |
66 | return _PAGE_CACHE_WC; | |
67 | else if (PageUncached(pg) && !PageWC(pg)) | |
68 | return _PAGE_CACHE_UC_MINUS; | |
69 | else | |
70 | return _PAGE_CACHE_WB; | |
71 | } | |
72 | ||
73 | static inline void set_page_memtype(struct page *pg, unsigned long memtype) | |
74 | { | |
75 | switch (memtype) { | |
76 | case _PAGE_CACHE_WC: | |
77 | ClearPageUncached(pg); | |
78 | SetPageWC(pg); | |
79 | break; | |
80 | case _PAGE_CACHE_UC_MINUS: | |
81 | SetPageUncached(pg); | |
82 | ClearPageWC(pg); | |
83 | break; | |
84 | case _PAGE_CACHE_WB: | |
85 | SetPageUncached(pg); | |
86 | SetPageWC(pg); | |
87 | break; | |
88 | default: | |
89 | case -1: | |
90 | ClearPageUncached(pg); | |
91 | ClearPageWC(pg); | |
92 | break; | |
93 | } | |
94 | } | |
95 | #else | |
96 | static inline unsigned long get_page_memtype(struct page *pg) { return -1; } | |
97 | static inline void set_page_memtype(struct page *pg, unsigned long memtype) { } | |
98 | #endif | |
75cbade8 | 99 | |
7219bebd AV |
100 | /* |
101 | * The set_memory_* API can be used to change various attributes of a virtual | |
102 | * address range. The attributes include: | |
103 | * Cachability : UnCached, WriteCombining, WriteBack | |
104 | * Executability : eXeutable, NoteXecutable | |
105 | * Read/Write : ReadOnly, ReadWrite | |
106 | * Presence : NotPresent | |
107 | * | |
108 | * Within a catagory, the attributes are mutually exclusive. | |
109 | * | |
110 | * The implementation of this API will take care of various aspects that | |
111 | * are associated with changing such attributes, such as: | |
112 | * - Flushing TLBs | |
113 | * - Flushing CPU caches | |
114 | * - Making sure aliases of the memory behind the mapping don't violate | |
115 | * coherency rules as defined by the CPU in the system. | |
116 | * | |
117 | * What this API does not do: | |
118 | * - Provide exclusion between various callers - including callers that | |
119 | * operation on other mappings of the same physical page | |
120 | * - Restore default attributes when a page is freed | |
121 | * - Guarantee that mappings other than the requested one are | |
122 | * in any state, other than that these do not violate rules for | |
123 | * the CPU you have. Do not depend on any effects on other mappings, | |
124 | * CPUs other than the one you have may have more relaxed rules. | |
125 | * The caller is required to take care of these. | |
126 | */ | |
75cbade8 | 127 | |
1219333d | 128 | int _set_memory_uc(unsigned long addr, int numpages); |
ef354af4 | 129 | int _set_memory_wc(unsigned long addr, int numpages); |
1219333d | 130 | int _set_memory_wb(unsigned long addr, int numpages); |
75cbade8 | 131 | int set_memory_uc(unsigned long addr, int numpages); |
ef354af4 | 132 | int set_memory_wc(unsigned long addr, int numpages); |
75cbade8 AV |
133 | int set_memory_wb(unsigned long addr, int numpages); |
134 | int set_memory_x(unsigned long addr, int numpages); | |
135 | int set_memory_nx(unsigned long addr, int numpages); | |
136 | int set_memory_ro(unsigned long addr, int numpages); | |
137 | int set_memory_rw(unsigned long addr, int numpages); | |
f62d0f00 | 138 | int set_memory_np(unsigned long addr, int numpages); |
c9caa02c | 139 | int set_memory_4k(unsigned long addr, int numpages); |
75cbade8 | 140 | |
d75586ad SL |
141 | int set_memory_array_uc(unsigned long *addr, int addrinarray); |
142 | int set_memory_array_wb(unsigned long *addr, int addrinarray); | |
143 | ||
0f350755 | 144 | int set_pages_array_uc(struct page **pages, int addrinarray); |
145 | int set_pages_array_wb(struct page **pages, int addrinarray); | |
146 | ||
7219bebd AV |
147 | /* |
148 | * For legacy compatibility with the old APIs, a few functions | |
149 | * are provided that work on a "struct page". | |
150 | * These functions operate ONLY on the 1:1 kernel mapping of the | |
151 | * memory that the struct page represents, and internally just | |
152 | * call the set_memory_* function. See the description of the | |
153 | * set_memory_* function for more details on conventions. | |
154 | * | |
155 | * These APIs should be considered *deprecated* and are likely going to | |
156 | * be removed in the future. | |
157 | * The reason for this is the implicit operation on the 1:1 mapping only, | |
158 | * making this not a generally useful API. | |
159 | * | |
160 | * Specifically, many users of the old APIs had a virtual address, | |
161 | * called virt_to_page() or vmalloc_to_page() on that address to | |
162 | * get a struct page* that the old API required. | |
163 | * To convert these cases, use set_memory_*() on the original | |
164 | * virtual address, do not use these functions. | |
165 | */ | |
166 | ||
167 | int set_pages_uc(struct page *page, int numpages); | |
168 | int set_pages_wb(struct page *page, int numpages); | |
169 | int set_pages_x(struct page *page, int numpages); | |
170 | int set_pages_nx(struct page *page, int numpages); | |
171 | int set_pages_ro(struct page *page, int numpages); | |
172 | int set_pages_rw(struct page *page, int numpages); | |
173 | ||
174 | ||
4c61afcd | 175 | void clflush_cache_range(void *addr, unsigned int size); |
b2bba72c | 176 | |
b2bba72c TG |
177 | #ifdef CONFIG_DEBUG_RODATA |
178 | void mark_rodata_ro(void); | |
7bfeab9a | 179 | extern const int rodata_test_data; |
502f6604 | 180 | extern int kernel_set_to_readonly; |
16239630 SR |
181 | void set_kernel_text_rw(void); |
182 | void set_kernel_text_ro(void); | |
183 | #else | |
184 | static inline void set_kernel_text_rw(void) { } | |
185 | static inline void set_kernel_text_ro(void) { } | |
b2bba72c | 186 | #endif |
7bfeab9a | 187 | |
edeed305 | 188 | #ifdef CONFIG_DEBUG_RODATA_TEST |
7bfeab9a | 189 | int rodata_test(void); |
edeed305 | 190 | #else |
7bfeab9a | 191 | static inline int rodata_test(void) |
edeed305 | 192 | { |
7bfeab9a | 193 | return 0; |
edeed305 AV |
194 | } |
195 | #endif | |
b2bba72c | 196 | |
1965aae3 | 197 | #endif /* _ASM_X86_CACHEFLUSH_H */ |