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