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. */
   8static inline void flush_cache_all(void) { }
   9static inline void flush_cache_mm(struct mm_struct *mm) { }
  10static inline void flush_cache_dup_mm(struct mm_struct *mm) { }
  11static inline void flush_cache_range(struct vm_area_struct *vma,
  12                                     unsigned long start, unsigned long end) { }
  13static inline void flush_cache_page(struct vm_area_struct *vma,
  14                                    unsigned long vmaddr, unsigned long pfn) { }
  15static inline void flush_dcache_page(struct page *page) { }
  16static inline void flush_dcache_mmap_lock(struct address_space *mapping) { }
  17static inline void flush_dcache_mmap_unlock(struct address_space *mapping) { }
  18static inline void flush_icache_range(unsigned long start,
  19                                      unsigned long end) { }
  20static inline void flush_icache_page(struct vm_area_struct *vma,
  21                                     struct page *page) { }
  22static inline void flush_icache_user_range(struct vm_area_struct *vma,
  23                                           struct page *page,
  24                                           unsigned long addr,
  25                                           unsigned long len) { }
  26static inline void flush_cache_vmap(unsigned long start, unsigned long end) { }
  27static inline void flush_cache_vunmap(unsigned long start,
  28                                      unsigned long end) { }
  29
  30static 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
  38static 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
  47PAGEFLAG(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 */
  60static 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
  72static 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
  95static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
  96static 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
 127int _set_memory_uc(unsigned long addr, int numpages);
 128int _set_memory_wc(unsigned long addr, int numpages);
 129int _set_memory_wb(unsigned long addr, int numpages);
 130int set_memory_uc(unsigned long addr, int numpages);
 131int set_memory_wc(unsigned long addr, int numpages);
 132int set_memory_wb(unsigned long addr, int numpages);
 133int set_memory_x(unsigned long addr, int numpages);
 134int set_memory_nx(unsigned long addr, int numpages);
 135int set_memory_ro(unsigned long addr, int numpages);
 136int set_memory_rw(unsigned long addr, int numpages);
 137int set_memory_np(unsigned long addr, int numpages);
 138int set_memory_4k(unsigned long addr, int numpages);
 139
 140int set_memory_array_uc(unsigned long *addr, int addrinarray);
 141int set_memory_array_wb(unsigned long *addr, int addrinarray);
 142
 143int set_pages_array_uc(struct page **pages, int addrinarray);
 144int 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
 166int set_pages_uc(struct page *page, int numpages);
 167int set_pages_wb(struct page *page, int numpages);
 168int set_pages_x(struct page *page, int numpages);
 169int set_pages_nx(struct page *page, int numpages);
 170int set_pages_ro(struct page *page, int numpages);
 171int set_pages_rw(struct page *page, int numpages);
 172
 173
 174void clflush_cache_range(void *addr, unsigned int size);
 175
 176#ifdef CONFIG_DEBUG_RODATA
 177void mark_rodata_ro(void);
 178extern const int rodata_test_data;
 179void set_kernel_text_rw(void);
 180void set_kernel_text_ro(void);
 181#else
 182static inline void set_kernel_text_rw(void) { }
 183static inline void set_kernel_text_ro(void) { }
 184#endif
 185
 186#ifdef CONFIG_DEBUG_RODATA_TEST
 187int rodata_test(void);
 188#else
 189static inline int rodata_test(void)
 190{
 191        return 0;
 192}
 193#endif
 194
 195#endif /* _ASM_X86_CACHEFLUSH_H */
 196