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 * 15 * Within a category, the attributes are mutually exclusive. 16 * 17 * The implementation of this API will take care of various aspects that 18 * are associated with changing such attributes, such as: 19 * - Flushing TLBs 20 * - Flushing CPU caches 21 * - Making sure aliases of the memory behind the mapping don't violate 22 * coherency rules as defined by the CPU in the system. 23 * 24 * What this API does not do: 25 * - Provide exclusion between various callers - including callers that 26 * operation on other mappings of the same physical page 27 * - Restore default attributes when a page is freed 28 * - Guarantee that mappings other than the requested one are 29 * in any state, other than that these do not violate rules for 30 * the CPU you have. Do not depend on any effects on other mappings, 31 * CPUs other than the one you have may have more relaxed rules. 32 * The caller is required to take care of these. 33 */ 34 35 int _set_memory_uc(unsigned long addr, int numpages); 36 int _set_memory_wc(unsigned long addr, int numpages); 37 int _set_memory_wt(unsigned long addr, int numpages); 38 int _set_memory_wb(unsigned long addr, int numpages); 39 int set_memory_uc(unsigned long addr, int numpages); 40 int set_memory_wc(unsigned long addr, int numpages); 41 int set_memory_wt(unsigned long addr, int numpages); 42 int set_memory_wb(unsigned long addr, int numpages); 43 int set_memory_np(unsigned long addr, int numpages); 44 int set_memory_4k(unsigned long addr, int numpages); 45 46 int set_memory_array_uc(unsigned long *addr, int addrinarray); 47 int set_memory_array_wc(unsigned long *addr, int addrinarray); 48 int set_memory_array_wt(unsigned long *addr, int addrinarray); 49 int set_memory_array_wb(unsigned long *addr, int addrinarray); 50 51 int set_pages_array_uc(struct page **pages, int addrinarray); 52 int set_pages_array_wc(struct page **pages, int addrinarray); 53 int set_pages_array_wt(struct page **pages, int addrinarray); 54 int set_pages_array_wb(struct page **pages, int addrinarray); 55 56 /* 57 * For legacy compatibility with the old APIs, a few functions 58 * are provided that work on a "struct page". 59 * These functions operate ONLY on the 1:1 kernel mapping of the 60 * memory that the struct page represents, and internally just 61 * call the set_memory_* function. See the description of the 62 * set_memory_* function for more details on conventions. 63 * 64 * These APIs should be considered *deprecated* and are likely going to 65 * be removed in the future. 66 * The reason for this is the implicit operation on the 1:1 mapping only, 67 * making this not a generally useful API. 68 * 69 * Specifically, many users of the old APIs had a virtual address, 70 * called virt_to_page() or vmalloc_to_page() on that address to 71 * get a struct page* that the old API required. 72 * To convert these cases, use set_memory_*() on the original 73 * virtual address, do not use these functions. 74 */ 75 76 int set_pages_uc(struct page *page, int numpages); 77 int set_pages_wb(struct page *page, int numpages); 78 int set_pages_x(struct page *page, int numpages); 79 int set_pages_nx(struct page *page, int numpages); 80 int set_pages_ro(struct page *page, int numpages); 81 int set_pages_rw(struct page *page, int numpages); 82 83 extern int kernel_set_to_readonly; 84 void set_kernel_text_rw(void); 85 void set_kernel_text_ro(void); 86 87 #endif /* _ASM_X86_SET_MEMORY_H */ 88