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