LXR linux/arch/x86/include/asm/cacheflush.h

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