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