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  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, WriteThrough, 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_wt(unsigned long addr, int numpages);
  39. int _set_memory_wb(unsigned long addr, int numpages);
  40. int set_memory_uc(unsigned long addr, int numpages);
  41. int set_memory_wc(unsigned long addr, int numpages);
  42. int set_memory_wt(unsigned long addr, int numpages);
  43. int set_memory_wb(unsigned long addr, int numpages);
  44. int set_memory_x(unsigned long addr, int numpages);
  45. int set_memory_nx(unsigned long addr, int numpages);
  46. int set_memory_ro(unsigned long addr, int numpages);
  47. int set_memory_rw(unsigned long addr, int numpages);
  48. int set_memory_np(unsigned long addr, int numpages);
  49. int set_memory_4k(unsigned long addr, int numpages);
  50.  
  51. int set_memory_array_uc(unsigned long *addr, int addrinarray);
  52. int set_memory_array_wc(unsigned long *addr, int addrinarray);
  53. int set_memory_array_wt(unsigned long *addr, int addrinarray);
  54. int set_memory_array_wb(unsigned long *addr, int addrinarray);
  55.  
  56. int set_pages_array_uc(struct page **pages, int addrinarray);
  57. int set_pages_array_wc(struct page **pages, int addrinarray);
  58. int set_pages_array_wt(struct page **pages, int addrinarray);
  59. int set_pages_array_wb(struct page **pages, int addrinarray);
  60.  
  61. /*
  62.  * For legacy compatibility with the old APIs, a few functions
  63.  * are provided that work on a "struct page".
  64.  * These functions operate ONLY on the 1:1 kernel mapping of the
  65.  * memory that the struct page represents, and internally just
  66.  * call the set_memory_* function. See the description of the
  67.  * set_memory_* function for more details on conventions.
  68.  *
  69.  * These APIs should be considered *deprecated* and are likely going to
  70.  * be removed in the future.
  71.  * The reason for this is the implicit operation on the 1:1 mapping only,
  72.  * making this not a generally useful API.
  73.  *
  74.  * Specifically, many users of the old APIs had a virtual address,
  75.  * called virt_to_page() or vmalloc_to_page() on that address to
  76.  * get a struct page* that the old API required.
  77.  * To convert these cases, use set_memory_*() on the original
  78.  * virtual address, do not use these functions.
  79.  */
  80.  
  81. static int set_pages_uc(struct page *page, int numpages)
  82. {
  83.     return 0;
  84. };
  85.  
  86. static int set_pages_wb(struct page *page, int numpages)
  87. {
  88.     return 0;
  89. };
  90.  
  91. static int set_pages_x(struct page *page, int numpages)
  92. {
  93.     return 0;
  94. };
  95.  
  96. static int set_pages_nx(struct page *page, int numpages)
  97. {
  98.     return 0;
  99. };
  100.  
  101. static int set_pages_ro(struct page *page, int numpages)
  102. {
  103.     return 0;
  104. };
  105.  
  106. static int set_pages_rw(struct page *page, int numpages)
  107. {
  108.     return 0;
  109. };
  110.  
  111.  
  112. void clflush_cache_range(void *addr, unsigned int size);
  113.  
  114. #define mmio_flush_range(addr, size) clflush_cache_range(addr, size)
  115.  
  116. #ifdef CONFIG_DEBUG_RODATA
  117. void mark_rodata_ro(void);
  118. extern const int rodata_test_data;
  119. extern int kernel_set_to_readonly;
  120. void set_kernel_text_rw(void);
  121. void set_kernel_text_ro(void);
  122. #else
  123. static inline void set_kernel_text_rw(void) { }
  124. static inline void set_kernel_text_ro(void) { }
  125. #endif
  126.  
  127. #ifdef CONFIG_DEBUG_RODATA_TEST
  128. int rodata_test(void);
  129. #else
  130. static inline int rodata_test(void)
  131. {
  132.         return 0;
  133. }
  134. #endif
  135.  
  136. #endif /* _ASM_X86_CACHEFLUSH_H */
  137.