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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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7143 | serge | 7 | #include |
5270 | serge | 8 | |
9 | /* |
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10 | * The set_memory_* API can be used to change various attributes of a virtual |
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11 | * address range. The attributes include: |
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6082 | serge | 12 | * Cachability : UnCached, WriteCombining, WriteThrough, WriteBack |
5270 | serge | 13 | * Executability : eXeutable, NoteXecutable |
14 | * Read/Write : ReadOnly, ReadWrite |
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15 | * Presence : NotPresent |
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16 | * |
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17 | * Within a category, the attributes are mutually exclusive. |
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18 | * |
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19 | * The implementation of this API will take care of various aspects that |
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20 | * are associated with changing such attributes, such as: |
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21 | * - Flushing TLBs |
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22 | * - Flushing CPU caches |
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23 | * - Making sure aliases of the memory behind the mapping don't violate |
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24 | * coherency rules as defined by the CPU in the system. |
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25 | * |
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26 | * What this API does not do: |
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27 | * - Provide exclusion between various callers - including callers that |
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28 | * operation on other mappings of the same physical page |
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29 | * - Restore default attributes when a page is freed |
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30 | * - Guarantee that mappings other than the requested one are |
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31 | * in any state, other than that these do not violate rules for |
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32 | * the CPU you have. Do not depend on any effects on other mappings, |
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33 | * CPUs other than the one you have may have more relaxed rules. |
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34 | * The caller is required to take care of these. |
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35 | */ |
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36 | |||
37 | int _set_memory_uc(unsigned long addr, int numpages); |
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38 | int _set_memory_wc(unsigned long addr, int numpages); |
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6082 | serge | 39 | int _set_memory_wt(unsigned long addr, int numpages); |
5270 | serge | 40 | int _set_memory_wb(unsigned long addr, int numpages); |
41 | int set_memory_uc(unsigned long addr, int numpages); |
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42 | int set_memory_wc(unsigned long addr, int numpages); |
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6082 | serge | 43 | int set_memory_wt(unsigned long addr, int numpages); |
5270 | serge | 44 | int set_memory_wb(unsigned long addr, int numpages); |
45 | int set_memory_x(unsigned long addr, int numpages); |
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46 | int set_memory_nx(unsigned long addr, int numpages); |
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47 | int set_memory_ro(unsigned long addr, int numpages); |
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48 | int set_memory_rw(unsigned long addr, int numpages); |
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49 | int set_memory_np(unsigned long addr, int numpages); |
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50 | int set_memory_4k(unsigned long addr, int numpages); |
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51 | |||
52 | int set_memory_array_uc(unsigned long *addr, int addrinarray); |
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53 | int set_memory_array_wc(unsigned long *addr, int addrinarray); |
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6082 | serge | 54 | int set_memory_array_wt(unsigned long *addr, int addrinarray); |
5270 | serge | 55 | int set_memory_array_wb(unsigned long *addr, int addrinarray); |
56 | |||
57 | int set_pages_array_uc(struct page **pages, int addrinarray); |
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58 | int set_pages_array_wc(struct page **pages, int addrinarray); |
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6082 | serge | 59 | int set_pages_array_wt(struct page **pages, int addrinarray); |
5270 | serge | 60 | int set_pages_array_wb(struct page **pages, int addrinarray); |
61 | |||
62 | /* |
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63 | * For legacy compatibility with the old APIs, a few functions |
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64 | * are provided that work on a "struct page". |
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65 | * These functions operate ONLY on the 1:1 kernel mapping of the |
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66 | * memory that the struct page represents, and internally just |
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67 | * call the set_memory_* function. See the description of the |
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68 | * set_memory_* function for more details on conventions. |
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69 | * |
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70 | * These APIs should be considered *deprecated* and are likely going to |
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71 | * be removed in the future. |
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72 | * The reason for this is the implicit operation on the 1:1 mapping only, |
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73 | * making this not a generally useful API. |
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74 | * |
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75 | * Specifically, many users of the old APIs had a virtual address, |
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76 | * called virt_to_page() or vmalloc_to_page() on that address to |
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77 | * get a struct page* that the old API required. |
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78 | * To convert these cases, use set_memory_*() on the original |
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79 | * virtual address, do not use these functions. |
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80 | */ |
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81 | |||
82 | static int set_pages_uc(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_wb(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_x(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_nx(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_ro(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 | static int set_pages_rw(struct page *page, int numpages) |
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108 | { |
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109 | return 0; |
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110 | }; |
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111 | |||
112 | |||
113 | void clflush_cache_range(void *addr, unsigned int size); |
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114 | |||
6082 | serge | 115 | #define mmio_flush_range(addr, size) clflush_cache_range(addr, size) |
116 | |||
5270 | serge | 117 | extern const int rodata_test_data; |
118 | extern int kernel_set_to_readonly; |
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119 | void set_kernel_text_rw(void); |
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120 | void set_kernel_text_ro(void); |
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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 */ |