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_non_WB                               PG_arch_1
  47 PAGEFLAG(NonWB, non_WB)
  48
  49 /*
  50  * The set_memory_* API can be used to change various attributes of a virtual
  51  * address range. The attributes include:
  52  * Cachability   : UnCached, WriteCombining, WriteBack
  53  * Executability : eXeutable, NoteXecutable
  54  * Read/Write    : ReadOnly, ReadWrite
  55  * Presence      : NotPresent
  56  *
  57  * Within a catagory, the attributes are mutually exclusive.
  58  *
  59  * The implementation of this API will take care of various aspects that
  60  * are associated with changing such attributes, such as:
  61  * - Flushing TLBs
  62  * - Flushing CPU caches
  63  * - Making sure aliases of the memory behind the mapping don't violate
  64  *   coherency rules as defined by the CPU in the system.
  65  *
  66  * What this API does not do:
  67  * - Provide exclusion between various callers - including callers that
  68  *   operation on other mappings of the same physical page
  69  * - Restore default attributes when a page is freed
  70  * - Guarantee that mappings other than the requested one are
  71  *   in any state, other than that these do not violate rules for
  72  *   the CPU you have. Do not depend on any effects on other mappings,
  73  *   CPUs other than the one you have may have more relaxed rules.
  74  * The caller is required to take care of these.
  75  */
  76
  77 int _set_memory_uc(unsigned long addr, int numpages);
  78 int _set_memory_wc(unsigned long addr, int numpages);
  79 int _set_memory_wb(unsigned long addr, int numpages);
  80 int set_memory_uc(unsigned long addr, int numpages);
  81 int set_memory_wc(unsigned long addr, int numpages);
  82 int set_memory_wb(unsigned long addr, int numpages);
  83 int set_memory_x(unsigned long addr, int numpages);
  84 int set_memory_nx(unsigned long addr, int numpages);
  85 int set_memory_ro(unsigned long addr, int numpages);
  86 int set_memory_rw(unsigned long addr, int numpages);
  87 int set_memory_np(unsigned long addr, int numpages);
  88 int set_memory_4k(unsigned long addr, int numpages);
  89
  90 int set_memory_array_uc(unsigned long *addr, int addrinarray);
  91 int set_memory_array_wb(unsigned long *addr, int addrinarray);
  92
  93 int set_pages_array_uc(struct page **pages, int addrinarray);
  94 int set_pages_array_wb(struct page **pages, int addrinarray);
  95
  96 /*
  97  * For legacy compatibility with the old APIs, a few functions
  98  * are provided that work on a "struct page".
  99  * These functions operate ONLY on the 1:1 kernel mapping of the
 100  * memory that the struct page represents, and internally just
 101  * call the set_memory_* function. See the description of the
 102  * set_memory_* function for more details on conventions.
 103  *
 104  * These APIs should be considered *deprecated* and are likely going to
 105  * be removed in the future.
 106  * The reason for this is the implicit operation on the 1:1 mapping only,
 107  * making this not a generally useful API.
 108  *
 109  * Specifically, many users of the old APIs had a virtual address,
 110  * called virt_to_page() or vmalloc_to_page() on that address to
 111  * get a struct page* that the old API required.
 112  * To convert these cases, use set_memory_*() on the original
 113  * virtual address, do not use these functions.
 114  */
 115
 116 int set_pages_uc(struct page *page, int numpages);
 117 int set_pages_wb(struct page *page, int numpages);
 118 int set_pages_x(struct page *page, int numpages);
 119 int set_pages_nx(struct page *page, int numpages);
 120 int set_pages_ro(struct page *page, int numpages);
 121 int set_pages_rw(struct page *page, int numpages);
 122
 123
 124 void clflush_cache_range(void *addr, unsigned int size);
 125
 126 #ifdef CONFIG_DEBUG_RODATA
 127 void mark_rodata_ro(void);
 128 extern const int rodata_test_data;
 129 void set_kernel_text_rw(void);
 130 void set_kernel_text_ro(void);
 131 #else
 132 static inline void set_kernel_text_rw(void) { }
 133 static inline void set_kernel_text_ro(void) { }
 134 #endif
 135
 136 #ifdef CONFIG_DEBUG_RODATA_TEST
 137 int rodata_test(void);
 138 #else
 139 static inline int rodata_test(void)
 140 {
 141         return 0;
 142 }
 143 #endif
 144
 145 #endif /* _ASM_X86_CACHEFLUSH_H */