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| 5270 | serge | 1 | #ifndef _ASM_X86_CACHEFLUSH_H |
| 2 | #define _ASM_X86_CACHEFLUSH_H |
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| 3 | |||
| 4 | /* Caches aren't brain-dead on the intel. */ |
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| 5 | #include |
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| 6 | #include |
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| 7 | |||
| 8 | /* |
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| 9 | * The set_memory_* API can be used to change various attributes of a virtual |
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| 10 | * address range. The attributes include: |
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| 11 | * Cachability : UnCached, WriteCombining, WriteBack |
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| 12 | * Executability : eXeutable, NoteXecutable |
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| 13 | * Read/Write : ReadOnly, ReadWrite |
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| 14 | * Presence : NotPresent |
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| 15 | * |
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| 16 | * Within a category, the attributes are mutually exclusive. |
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| 17 | * |
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| 18 | * The implementation of this API will take care of various aspects that |
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| 19 | * are associated with changing such attributes, such as: |
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| 20 | * - Flushing TLBs |
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| 21 | * - Flushing CPU caches |
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| 22 | * - Making sure aliases of the memory behind the mapping don't violate |
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| 23 | * coherency rules as defined by the CPU in the system. |
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| 24 | * |
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| 25 | * What this API does not do: |
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| 26 | * - Provide exclusion between various callers - including callers that |
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| 27 | * operation on other mappings of the same physical page |
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| 28 | * - Restore default attributes when a page is freed |
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| 29 | * - Guarantee that mappings other than the requested one are |
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| 30 | * in any state, other than that these do not violate rules for |
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| 31 | * the CPU you have. Do not depend on any effects on other mappings, |
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| 32 | * CPUs other than the one you have may have more relaxed rules. |
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| 33 | * The caller is required to take care of these. |
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| 34 | */ |
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| 35 | |||
| 36 | int _set_memory_uc(unsigned long addr, int numpages); |
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| 37 | int _set_memory_wc(unsigned long addr, int numpages); |
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| 38 | int _set_memory_wb(unsigned long addr, int numpages); |
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| 39 | int set_memory_uc(unsigned long addr, int numpages); |
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| 40 | int set_memory_wc(unsigned long addr, int numpages); |
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| 41 | int set_memory_wb(unsigned long addr, int numpages); |
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| 42 | int set_memory_x(unsigned long addr, int numpages); |
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| 43 | int set_memory_nx(unsigned long addr, int numpages); |
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| 44 | int set_memory_ro(unsigned long addr, int numpages); |
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| 45 | int set_memory_rw(unsigned long addr, int numpages); |
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| 46 | int set_memory_np(unsigned long addr, int numpages); |
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| 47 | int set_memory_4k(unsigned long addr, int numpages); |
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| 48 | |||
| 49 | int set_memory_array_uc(unsigned long *addr, int addrinarray); |
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| 50 | int set_memory_array_wc(unsigned long *addr, int addrinarray); |
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| 51 | int set_memory_array_wb(unsigned long *addr, int addrinarray); |
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| 52 | |||
| 53 | int set_pages_array_uc(struct page **pages, int addrinarray); |
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| 54 | int set_pages_array_wc(struct page **pages, int addrinarray); |
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| 55 | int set_pages_array_wb(struct page **pages, int addrinarray); |
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| 56 | |||
| 57 | /* |
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| 58 | * For legacy compatibility with the old APIs, a few functions |
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| 59 | * are provided that work on a "struct page". |
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| 60 | * These functions operate ONLY on the 1:1 kernel mapping of the |
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| 61 | * memory that the struct page represents, and internally just |
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| 62 | * call the set_memory_* function. See the description of the |
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| 63 | * set_memory_* function for more details on conventions. |
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| 64 | * |
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| 65 | * These APIs should be considered *deprecated* and are likely going to |
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| 66 | * be removed in the future. |
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| 67 | * The reason for this is the implicit operation on the 1:1 mapping only, |
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| 68 | * making this not a generally useful API. |
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| 69 | * |
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| 70 | * Specifically, many users of the old APIs had a virtual address, |
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| 71 | * called virt_to_page() or vmalloc_to_page() on that address to |
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| 72 | * get a struct page* that the old API required. |
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| 73 | * To convert these cases, use set_memory_*() on the original |
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| 74 | * virtual address, do not use these functions. |
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| 75 | */ |
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| 76 | |||
| 77 | static int set_pages_uc(struct page *page, int numpages) |
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| 78 | { |
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| 79 | return 0; |
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| 80 | }; |
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| 81 | |||
| 82 | static int set_pages_wb(struct page *page, int numpages) |
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| 83 | { |
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| 84 | return 0; |
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| 85 | }; |
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| 86 | |||
| 87 | static int set_pages_x(struct page *page, int numpages) |
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| 88 | { |
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| 89 | return 0; |
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| 90 | }; |
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| 91 | |||
| 92 | static int set_pages_nx(struct page *page, int numpages) |
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| 93 | { |
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| 94 | return 0; |
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| 95 | }; |
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| 96 | |||
| 97 | static int set_pages_ro(struct page *page, int numpages) |
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| 98 | { |
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| 99 | return 0; |
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| 100 | }; |
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| 101 | |||
| 102 | static int set_pages_rw(struct page *page, int numpages) |
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| 103 | { |
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| 104 | return 0; |
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| 105 | }; |
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| 106 | |||
| 107 | |||
| 108 | |||
| 109 | void clflush_cache_range(void *addr, unsigned int size); |
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| 110 | |||
| 111 | #ifdef CONFIG_DEBUG_RODATA |
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| 112 | void mark_rodata_ro(void); |
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| 113 | extern const int rodata_test_data; |
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| 114 | extern int kernel_set_to_readonly; |
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| 115 | void set_kernel_text_rw(void); |
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| 116 | void set_kernel_text_ro(void); |
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| 117 | #else |
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| 118 | static inline void set_kernel_text_rw(void) { } |
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| 119 | static inline void set_kernel_text_ro(void) { } |
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| 120 | #endif |
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| 121 | |||
| 122 | #ifdef CONFIG_DEBUG_RODATA_TEST |
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| 123 | int rodata_test(void); |
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| 124 | #else |
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| 125 | static inline int rodata_test(void) |
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| 126 | { |
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| 127 | return 0; |
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| 128 | } |
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| 129 | #endif |
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| 130 | |||
| 131 | #endif /* _ASM_X86_CACHEFLUSH_H */ |