release/src-rt-6.x.4708/linux/linux-2.6.36/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 static inline void flush_cache_all(void) { }
   9 static inline void flush_cache_mm(struct mm_struct *mm) { }
  10 static inline void flush_cache_dup_mm(struct mm_struct *mm) { }
  11 static inline void flush_cache_range(struct vm_area_struct *vma,
  12                                      unsigned long start, unsigned long end) { }
  13 static inline void flush_cache_page(struct vm_area_struct *vma,
  14                                     unsigned long vmaddr, unsigned long pfn) { }
  15 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
  16 static inline void flush_dcache_page(struct page *page) { }
  17 static inline void flush_dcache_mmap_lock(struct address_space *mapping) { }
  18 static inline void flush_dcache_mmap_unlock(struct address_space *mapping) { }
  19 static inline void flush_icache_range(unsigned long start,
  20                                       unsigned long end) { }
  21 static inline void flush_icache_page(struct vm_area_struct *vma,
  22                                      struct page *page) { }
  23 static inline void flush_icache_user_range(struct vm_area_struct *vma,
  24                                            struct page *page,
  25                                            unsigned long addr,
  26                                            unsigned long len) { }
  27 static inline void flush_cache_vmap(unsigned long start, unsigned long end) { }
  28 static inline void flush_cache_vunmap(unsigned long start,
  29                                       unsigned long end) { }
  30
  31 static inline void copy_to_user_page(struct vm_area_struct *vma,
  32                                      struct page *page, unsigned long vaddr,
  33                                      void *dst, const void *src,
  34                                      unsigned long len)
  35 {
  36         memcpy(dst, src, len);
  37 }
  38
  39 static inline void copy_from_user_page(struct vm_area_struct *vma,
  40                                        struct page *page, unsigned long vaddr,
  41                                        void *dst, const void *src,
  42                                        unsigned long len)
  43 {
  44         memcpy(dst, src, len);
  45 }
  46
  47 #ifdef CONFIG_X86_PAT
  48 /*
  49  * X86 PAT uses page flags WC and Uncached together to keep track of
  50  * memory type of pages that have backing page struct. X86 PAT supports 3
  51  * different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and
  52  * _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not
  53  * been changed from its default (value of -1 used to denote this).
  54  * Note we do not support _PAGE_CACHE_UC here.
  55  */
  56
  57 #define _PGMT_DEFAULT           0
  58 #define _PGMT_WC                (1UL << PG_arch_1)
  59 #define _PGMT_UC_MINUS          (1UL << PG_uncached)
  60 #define _PGMT_WB                (1UL << PG_uncached | 1UL << PG_arch_1)
  61 #define _PGMT_MASK              (1UL << PG_uncached | 1UL << PG_arch_1)
  62 #define _PGMT_CLEAR_MASK        (~_PGMT_MASK)
  63
  64 static inline unsigned long get_page_memtype(struct page *pg)
  65 {
  66         unsigned long pg_flags = pg->flags & _PGMT_MASK;
  67
  68         if (pg_flags == _PGMT_DEFAULT)
  69                 return -1;
  70         else if (pg_flags == _PGMT_WC)
  71                 return _PAGE_CACHE_WC;
  72         else if (pg_flags == _PGMT_UC_MINUS)
  73                 return _PAGE_CACHE_UC_MINUS;
  74         else
  75                 return _PAGE_CACHE_WB;
  76 }
  77
  78 static inline void set_page_memtype(struct page *pg, unsigned long memtype)
  79 {
  80         unsigned long memtype_flags = _PGMT_DEFAULT;
  81         unsigned long old_flags;
  82         unsigned long new_flags;
  83
  84         switch (memtype) {
  85         case _PAGE_CACHE_WC:
  86                 memtype_flags = _PGMT_WC;
  87                 break;
  88         case _PAGE_CACHE_UC_MINUS:
  89                 memtype_flags = _PGMT_UC_MINUS;
  90                 break;
  91         case _PAGE_CACHE_WB:
  92                 memtype_flags = _PGMT_WB;
  93                 break;
  94         }
  95
  96         do {
  97                 old_flags = pg->flags;
  98                 new_flags = (old_flags & _PGMT_CLEAR_MASK) | memtype_flags;
  99         } while (cmpxchg(&pg->flags, old_flags, new_flags) != old_flags);
 100 }
 101 #else
 102 static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
 103 static inline void set_page_memtype(struct page *pg, unsigned long memtype) { }
 104 #endif
 105
 106 /*
 107  * The set_memory_* API can be used to change various attributes of a virtual
 108  * address range. The attributes include:
 109  * Cachability   : UnCached, WriteCombining, WriteBack
 110  * Executability : eXeutable, NoteXecutable
 111  * Read/Write    : ReadOnly, ReadWrite
 112  * Presence      : NotPresent
 113  *
 114  * Within a catagory, the attributes are mutually exclusive.
 115  *
 116  * The implementation of this API will take care of various aspects that
 117  * are associated with changing such attributes, such as:
 118  * - Flushing TLBs
 119  * - Flushing CPU caches
 120  * - Making sure aliases of the memory behind the mapping don't violate
 121  *   coherency rules as defined by the CPU in the system.
 122  *
 123  * What this API does not do:
 124  * - Provide exclusion between various callers - including callers that
 125  *   operation on other mappings of the same physical page
 126  * - Restore default attributes when a page is freed
 127  * - Guarantee that mappings other than the requested one are
 128  *   in any state, other than that these do not violate rules for
 129  *   the CPU you have. Do not depend on any effects on other mappings,
 130  *   CPUs other than the one you have may have more relaxed rules.
 131  * The caller is required to take care of these.
 132  */
 133
 134 int _set_memory_uc(unsigned long addr, int numpages);
 135 int _set_memory_wc(unsigned long addr, int numpages);
 136 int _set_memory_wb(unsigned long addr, int numpages);
 137 int set_memory_uc(unsigned long addr, int numpages);
 138 int set_memory_wc(unsigned long addr, int numpages);
 139 int set_memory_wb(unsigned long addr, int numpages);
 140 int set_memory_x(unsigned long addr, int numpages);
 141 int set_memory_nx(unsigned long addr, int numpages);
 142 int set_memory_ro(unsigned long addr, int numpages);
 143 int set_memory_rw(unsigned long addr, int numpages);
 144 int set_memory_np(unsigned long addr, int numpages);
 145 int set_memory_4k(unsigned long addr, int numpages);
 146
 147 int set_memory_array_uc(unsigned long *addr, int addrinarray);
 148 int set_memory_array_wc(unsigned long *addr, int addrinarray);
 149 int set_memory_array_wb(unsigned long *addr, int addrinarray);
 150
 151 int set_pages_array_uc(struct page **pages, int addrinarray);
 152 int set_pages_array_wc(struct page **pages, int addrinarray);
 153 int set_pages_array_wb(struct page **pages, int addrinarray);
 154
 155 /*
 156  * For legacy compatibility with the old APIs, a few functions
 157  * are provided that work on a "struct page".
 158  * These functions operate ONLY on the 1:1 kernel mapping of the
 159  * memory that the struct page represents, and internally just
 160  * call the set_memory_* function. See the description of the
 161  * set_memory_* function for more details on conventions.
 162  *
 163  * These APIs should be considered *deprecated* and are likely going to
 164  * be removed in the future.
 165  * The reason for this is the implicit operation on the 1:1 mapping only,
 166  * making this not a generally useful API.
 167  *
 168  * Specifically, many users of the old APIs had a virtual address,
 169  * called virt_to_page() or vmalloc_to_page() on that address to
 170  * get a struct page* that the old API required.
 171  * To convert these cases, use set_memory_*() on the original
 172  * virtual address, do not use these functions.
 173  */
 174
 175 int set_pages_uc(struct page *page, int numpages);
 176 int set_pages_wb(struct page *page, int numpages);
 177 int set_pages_x(struct page *page, int numpages);
 178 int set_pages_nx(struct page *page, int numpages);
 179 int set_pages_ro(struct page *page, int numpages);
 180 int set_pages_rw(struct page *page, int numpages);
 181
 182
 183 void clflush_cache_range(void *addr, unsigned int size);
 184
 185 #ifdef CONFIG_DEBUG_RODATA
 186 void mark_rodata_ro(void);
 187 extern const int rodata_test_data;
 188 extern int kernel_set_to_readonly;
 189 void set_kernel_text_rw(void);
 190 void set_kernel_text_ro(void);
 191 #else
 192 static inline void set_kernel_text_rw(void) { }
 193 static inline void set_kernel_text_ro(void) { }
 194 #endif
 195
 196 #ifdef CONFIG_DEBUG_RODATA_TEST
 197 int rodata_test(void);
 198 #else
 199 static inline int rodata_test(void)
 200 {
 201         return 0;
 202 }
 203 #endif
 204
 205 #endif /* _ASM_X86_CACHEFLUSH_H */