arch/x86/include/asm/cacheflush.h

   1 #ifndef _ASM_X86_CACHEFLUSH_H
   2 #define _ASM_X86_CACHEFLUSH_H
   3
   4 /* Keep includes the same across arches.  */
   5 #include <linux/mm.h>
   6
   7 /* Caches aren't brain-dead on the intel. */
   8 #define flush_cache_all()                       do { } while (0)
   9 #define flush_cache_mm(mm)                      do { } while (0)
  10 #define flush_cache_dup_mm(mm)                  do { } while (0)
  11 #define flush_cache_range(vma, start, end)      do { } while (0)
  12 #define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
  13 #define flush_dcache_page(page)                 do { } while (0)
  14 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
  15 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  16 #define flush_icache_range(start, end)          do { } while (0)
  17 #define flush_icache_page(vma, pg)              do { } while (0)
  18 #define flush_icache_user_range(vma, pg, adr, len)      do { } while (0)
  19 #define flush_cache_vmap(start, end)            do { } while (0)
  20 #define flush_cache_vunmap(start, end)          do { } while (0)
  21
  22 #define copy_to_user_page(vma, page, vaddr, dst, src, len)      \
  23         memcpy((dst), (src), (len))
  24 #define copy_from_user_page(vma, page, vaddr, dst, src, len)    \
  25         memcpy((dst), (src), (len))
  26
  27 #define PG_non_WB                               PG_arch_1
  28 PAGEFLAG(NonWB, non_WB)
  29
  30 /*
  31  * The set_memory_* API can be used to change various attributes of a virtual
  32  * address range. The attributes include:
  33  * Cachability   : UnCached, WriteCombining, WriteBack
  34  * Executability : eXeutable, NoteXecutable
  35  * Read/Write    : ReadOnly, ReadWrite
  36  * Presence      : NotPresent
  37  *
  38  * Within a catagory, the attributes are mutually exclusive.
  39  *
  40  * The implementation of this API will take care of various aspects that
  41  * are associated with changing such attributes, such as:
  42  * - Flushing TLBs
  43  * - Flushing CPU caches
  44  * - Making sure aliases of the memory behind the mapping don't violate
  45  *   coherency rules as defined by the CPU in the system.
  46  *
  47  * What this API does not do:
  48  * - Provide exclusion between various callers - including callers that
  49  *   operation on other mappings of the same physical page
  50  * - Restore default attributes when a page is freed
  51  * - Guarantee that mappings other than the requested one are
  52  *   in any state, other than that these do not violate rules for
  53  *   the CPU you have. Do not depend on any effects on other mappings,
  54  *   CPUs other than the one you have may have more relaxed rules.
  55  * The caller is required to take care of these.
  56  */
  57
  58 int _set_memory_uc(unsigned long addr, int numpages);
  59 int _set_memory_wc(unsigned long addr, int numpages);
  60 int _set_memory_wb(unsigned long addr, int numpages);
  61 int set_memory_uc(unsigned long addr, int numpages);
  62 int set_memory_wc(unsigned long addr, int numpages);
  63 int set_memory_wb(unsigned long addr, int numpages);
  64 int set_memory_x(unsigned long addr, int numpages);
  65 int set_memory_nx(unsigned long addr, int numpages);
  66 int set_memory_ro(unsigned long addr, int numpages);
  67 int set_memory_rw(unsigned long addr, int numpages);
  68 int set_memory_np(unsigned long addr, int numpages);
  69 int set_memory_4k(unsigned long addr, int numpages);
  70
  71 int set_memory_array_uc(unsigned long *addr, int addrinarray);
  72 int set_memory_array_wb(unsigned long *addr, int addrinarray);
  73
  74 /*
  75  * For legacy compatibility with the old APIs, a few functions
  76  * are provided that work on a "struct page".
  77  * These functions operate ONLY on the 1:1 kernel mapping of the
  78  * memory that the struct page represents, and internally just
  79  * call the set_memory_* function. See the description of the
  80  * set_memory_* function for more details on conventions.
  81  *
  82  * These APIs should be considered *deprecated* and are likely going to
  83  * be removed in the future.
  84  * The reason for this is the implicit operation on the 1:1 mapping only,
  85  * making this not a generally useful API.
  86  *
  87  * Specifically, many users of the old APIs had a virtual address,
  88  * called virt_to_page() or vmalloc_to_page() on that address to
  89  * get a struct page* that the old API required.
  90  * To convert these cases, use set_memory_*() on the original
  91  * virtual address, do not use these functions.
  92  */
  93
  94 int set_pages_uc(struct page *page, int numpages);
  95 int set_pages_wb(struct page *page, int numpages);
  96 int set_pages_x(struct page *page, int numpages);
  97 int set_pages_nx(struct page *page, int numpages);
  98 int set_pages_ro(struct page *page, int numpages);
  99 int set_pages_rw(struct page *page, int numpages);
 100
 101
 102 void clflush_cache_range(void *addr, unsigned int size);
 103
 104 #ifdef CONFIG_DEBUG_RODATA
 105 void mark_rodata_ro(void);
 106 extern const int rodata_test_data;
 107 #endif
 108
 109 #ifdef CONFIG_DEBUG_RODATA_TEST
 110 int rodata_test(void);
 111 #else
 112 static inline int rodata_test(void)
 113 {
 114         return 0;
 115 }
 116 #endif
 117
 118 #endif /* _ASM_X86_CACHEFLUSH_H */