LXR linux/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
  28PAGEFLAG(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
  58int _set_memory_uc(unsigned long addr, int numpages);
  59int _set_memory_wc(unsigned long addr, int numpages);
  60int _set_memory_wb(unsigned long addr, int numpages);
  61int set_memory_uc(unsigned long addr, int numpages);
  62int set_memory_wc(unsigned long addr, int numpages);
  63int set_memory_wb(unsigned long addr, int numpages);
  64int set_memory_x(unsigned long addr, int numpages);
  65int set_memory_nx(unsigned long addr, int numpages);
  66int set_memory_ro(unsigned long addr, int numpages);
  67int set_memory_rw(unsigned long addr, int numpages);
  68int set_memory_np(unsigned long addr, int numpages);
  69int set_memory_4k(unsigned long addr, int numpages);
  70
  71int set_memory_array_uc(unsigned long *addr, int addrinarray);
  72int 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
  94int set_pages_uc(struct page *page, int numpages);
  95int set_pages_wb(struct page *page, int numpages);
  96int set_pages_x(struct page *page, int numpages);
  97int set_pages_nx(struct page *page, int numpages);
  98int set_pages_ro(struct page *page, int numpages);
  99int set_pages_rw(struct page *page, int numpages);
 100
 101
 102void clflush_cache_range(void *addr, unsigned int size);
 103
 104#ifdef CONFIG_DEBUG_RODATA
 105void mark_rodata_ro(void);
 106extern const int rodata_test_data;
 107#endif
 108
 109#ifdef CONFIG_DEBUG_RODATA_TEST
 110int rodata_test(void);
 111#else
 112static inline int rodata_test(void)
 113{
 114        return 0;
 115}
 116#endif
 117
 118#endif /* _ASM_X86_CACHEFLUSH_H */
 119