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