arch/x86/include/asm/set_memory.h

   1 #ifndef _ASM_X86_SET_MEMORY_H
   2 #define _ASM_X86_SET_MEMORY_H
   3
   4 #include <asm/page.h>
   5 #include <asm-generic/set_memory.h>
   6
   7 /*
   8  * The set_memory_* API can be used to change various attributes of a virtual
   9  * address range. The attributes include:
  10  * Cachability   : UnCached, WriteCombining, WriteThrough, WriteBack
  11  * Executability : eXeutable, NoteXecutable
  12  * Read/Write    : ReadOnly, ReadWrite
  13  * Presence      : NotPresent
  14  * Encryption    : Encrypted, Decrypted
  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
  36 int _set_memory_uc(unsigned long addr, int numpages);
  37 int _set_memory_wc(unsigned long addr, int numpages);
  38 int _set_memory_wt(unsigned long addr, int numpages);
  39 int _set_memory_wb(unsigned long addr, int numpages);
  40 int set_memory_uc(unsigned long addr, int numpages);
  41 int set_memory_wc(unsigned long addr, int numpages);
  42 int set_memory_wt(unsigned long addr, int numpages);
  43 int set_memory_wb(unsigned long addr, int numpages);
  44 int set_memory_np(unsigned long addr, int numpages);
  45 int set_memory_4k(unsigned long addr, int numpages);
  46 int set_memory_encrypted(unsigned long addr, int numpages);
  47 int set_memory_decrypted(unsigned long addr, int numpages);
  48
  49 int set_memory_array_uc(unsigned long *addr, int addrinarray);
  50 int set_memory_array_wc(unsigned long *addr, int addrinarray);
  51 int set_memory_array_wt(unsigned long *addr, int addrinarray);
  52 int set_memory_array_wb(unsigned long *addr, int addrinarray);
  53
  54 int set_pages_array_uc(struct page **pages, int addrinarray);
  55 int set_pages_array_wc(struct page **pages, int addrinarray);
  56 int set_pages_array_wt(struct page **pages, int addrinarray);
  57 int set_pages_array_wb(struct page **pages, int addrinarray);
  58
  59 /*
  60  * For legacy compatibility with the old APIs, a few functions
  61  * are provided that work on a "struct page".
  62  * These functions operate ONLY on the 1:1 kernel mapping of the
  63  * memory that the struct page represents, and internally just
  64  * call the set_memory_* function. See the description of the
  65  * set_memory_* function for more details on conventions.
  66  *
  67  * These APIs should be considered *deprecated* and are likely going to
  68  * be removed in the future.
  69  * The reason for this is the implicit operation on the 1:1 mapping only,
  70  * making this not a generally useful API.
  71  *
  72  * Specifically, many users of the old APIs had a virtual address,
  73  * called virt_to_page() or vmalloc_to_page() on that address to
  74  * get a struct page* that the old API required.
  75  * To convert these cases, use set_memory_*() on the original
  76  * virtual address, do not use these functions.
  77  */
  78
  79 int set_pages_uc(struct page *page, int numpages);
  80 int set_pages_wb(struct page *page, int numpages);
  81 int set_pages_x(struct page *page, int numpages);
  82 int set_pages_nx(struct page *page, int numpages);
  83 int set_pages_ro(struct page *page, int numpages);
  84 int set_pages_rw(struct page *page, int numpages);
  85
  86 extern int kernel_set_to_readonly;
  87 void set_kernel_text_rw(void);
  88 void set_kernel_text_ro(void);
  89
  90 #endif /* _ASM_X86_SET_MEMORY_H */