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#include <asm/uaccess.h>
   8
   9/*
  10 * The set_memory_* API can be used to change various attributes of a virtual
  11 * address range. The attributes include:
  12 * Cachability   : UnCached, WriteCombining, WriteThrough, WriteBack
  13 * Executability : eXeutable, NoteXecutable
  14 * Read/Write    : ReadOnly, ReadWrite
  15 * Presence      : NotPresent
  16 *
  17 * Within a category, the attributes are mutually exclusive.
  18 *
  19 * The implementation of this API will take care of various aspects that
  20 * are associated with changing such attributes, such as:
  21 * - Flushing TLBs
  22 * - Flushing CPU caches
  23 * - Making sure aliases of the memory behind the mapping don't violate
  24 *   coherency rules as defined by the CPU in the system.
  25 *
  26 * What this API does not do:
  27 * - Provide exclusion between various callers - including callers that
  28 *   operation on other mappings of the same physical page
  29 * - Restore default attributes when a page is freed
  30 * - Guarantee that mappings other than the requested one are
  31 *   in any state, other than that these do not violate rules for
  32 *   the CPU you have. Do not depend on any effects on other mappings,
  33 *   CPUs other than the one you have may have more relaxed rules.
  34 * The caller is required to take care of these.
  35 */
  36
  37int _set_memory_uc(unsigned long addr, int numpages);
  38int _set_memory_wc(unsigned long addr, int numpages);
  39int _set_memory_wt(unsigned long addr, int numpages);
  40int _set_memory_wb(unsigned long addr, int numpages);
  41int set_memory_uc(unsigned long addr, int numpages);
  42int set_memory_wc(unsigned long addr, int numpages);
  43int set_memory_wt(unsigned long addr, int numpages);
  44int set_memory_wb(unsigned long addr, int numpages);
  45int set_memory_x(unsigned long addr, int numpages);
  46int set_memory_nx(unsigned long addr, int numpages);
  47int set_memory_ro(unsigned long addr, int numpages);
  48int set_memory_rw(unsigned long addr, int numpages);
  49int set_memory_np(unsigned long addr, int numpages);
  50int set_memory_4k(unsigned long addr, int numpages);
  51
  52int set_memory_array_uc(unsigned long *addr, int addrinarray);
  53int set_memory_array_wc(unsigned long *addr, int addrinarray);
  54int set_memory_array_wt(unsigned long *addr, int addrinarray);
  55int set_memory_array_wb(unsigned long *addr, int addrinarray);
  56
  57int set_pages_array_uc(struct page **pages, int addrinarray);
  58int set_pages_array_wc(struct page **pages, int addrinarray);
  59int set_pages_array_wt(struct page **pages, int addrinarray);
  60int set_pages_array_wb(struct page **pages, int addrinarray);
  61
  62/*
  63 * For legacy compatibility with the old APIs, a few functions
  64 * are provided that work on a "struct page".
  65 * These functions operate ONLY on the 1:1 kernel mapping of the
  66 * memory that the struct page represents, and internally just
  67 * call the set_memory_* function. See the description of the
  68 * set_memory_* function for more details on conventions.
  69 *
  70 * These APIs should be considered *deprecated* and are likely going to
  71 * be removed in the future.
  72 * The reason for this is the implicit operation on the 1:1 mapping only,
  73 * making this not a generally useful API.
  74 *
  75 * Specifically, many users of the old APIs had a virtual address,
  76 * called virt_to_page() or vmalloc_to_page() on that address to
  77 * get a struct page* that the old API required.
  78 * To convert these cases, use set_memory_*() on the original
  79 * virtual address, do not use these functions.
  80 */
  81
  82int set_pages_uc(struct page *page, int numpages);
  83int set_pages_wb(struct page *page, int numpages);
  84int set_pages_x(struct page *page, int numpages);
  85int set_pages_nx(struct page *page, int numpages);
  86int set_pages_ro(struct page *page, int numpages);
  87int set_pages_rw(struct page *page, int numpages);
  88
  89
  90void clflush_cache_range(void *addr, unsigned int size);
  91
  92#define mmio_flush_range(addr, size) clflush_cache_range(addr, size)
  93
  94#ifdef CONFIG_DEBUG_RODATA
  95void mark_rodata_ro(void);
  96extern const int rodata_test_data;
  97extern int kernel_set_to_readonly;
  98void set_kernel_text_rw(void);
  99void set_kernel_text_ro(void);
 100#else
 101static inline void set_kernel_text_rw(void) { }
 102static inline void set_kernel_text_ro(void) { }
 103#endif
 104
 105#ifdef CONFIG_DEBUG_RODATA_TEST
 106int rodata_test(void);
 107#else
 108static inline int rodata_test(void)
 109{
 110        return 0;
 111}
 112#endif
 113
 114#endif /* _ASM_X86_CACHEFLUSH_H */
 115