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