1 #ifndef _ASM_X86_CACHEFLUSH_H
2 #define _ASM_X86_CACHEFLUSH_H
4 /* Keep includes the same across arches. */
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,
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) { }
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,
35 memcpy(dst, src, len);
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,
43 memcpy(dst, src, len);
46 #define PG_WC PG_arch_1
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.
58 * Caller must hold memtype_lock for atomicity.
60 static inline unsigned long get_page_memtype(struct page *pg)
62 if (!PageUncached(pg) && !PageWC(pg))
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;
69 return _PAGE_CACHE_WB;
72 static inline void set_page_memtype(struct page *pg, unsigned long memtype)
76 ClearPageUncached(pg);
79 case _PAGE_CACHE_UC_MINUS:
89 ClearPageUncached(pg);
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) { }
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
107 * Within a catagory, the attributes are mutually exclusive.
109 * The implementation of this API will take care of various aspects that
110 * are associated with changing such attributes, such as:
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.
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.
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);
140 int set_memory_array_uc(unsigned long *addr, int addrinarray);
141 int set_memory_array_wb(unsigned long *addr, int addrinarray);
143 int set_pages_array_uc(struct page **pages, int addrinarray);
144 int set_pages_array_wb(struct page **pages, int addrinarray);
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.
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.
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.
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);
174 void clflush_cache_range(void *addr, unsigned int size);
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);
182 static inline void set_kernel_text_rw(void) { }
183 static inline void set_kernel_text_ro(void) { }
186 #ifdef CONFIG_DEBUG_RODATA_TEST
187 int rodata_test(void);
189 static inline int rodata_test(void)
195 #endif /* _ASM_X86_CACHEFLUSH_H */