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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. #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. static int set_pages_uc(struct page *page, int numpages)
  83. {
  84.     return 0;
  85. };
  86.  
  87. static int set_pages_wb(struct page *page, int numpages)
  88. {
  89.     return 0;
  90. };
  91.  
  92. static int set_pages_x(struct page *page, int numpages)
  93. {
  94.     return 0;
  95. };
  96.  
  97. static int set_pages_nx(struct page *page, int numpages)
  98. {
  99.     return 0;
  100. };
  101.  
  102. static int set_pages_ro(struct page *page, int numpages)
  103. {
  104.     return 0;
  105. };
  106.  
  107. static int set_pages_rw(struct page *page, int numpages)
  108. {
  109.     return 0;
  110. };
  111.  
  112.  
  113. void clflush_cache_range(void *addr, unsigned int size);
  114.  
  115. #define mmio_flush_range(addr, size) clflush_cache_range(addr, size)
  116.  
  117. extern const int rodata_test_data;
  118. extern int kernel_set_to_readonly;
  119. void set_kernel_text_rw(void);
  120. void set_kernel_text_ro(void);
  121.  
  122. #ifdef CONFIG_DEBUG_RODATA_TEST
  123. int rodata_test(void);
  124. #else
  125. static inline int rodata_test(void)
  126. {
  127.         return 0;
  128. }
  129. #endif
  130.  
  131. #endif /* _ASM_X86_CACHEFLUSH_H */
  132.