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Linux/arch/x86/include/asm/cacheflush.h

  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 

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