]>
Commit | Line | Data |
---|---|---|
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 | ||
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_x(unsigned long addr, int numpages); | |
45 | int set_memory_nx(unsigned long addr, int numpages); | |
46 | int set_memory_ro(unsigned long addr, int numpages); | |
47 | int set_memory_rw(unsigned long addr, int numpages); | |
48 | int set_memory_np(unsigned long addr, int numpages); | |
49 | int set_memory_4k(unsigned long addr, int numpages); | |
50 | ||
51 | int set_memory_array_uc(unsigned long *addr, int addrinarray); | |
52 | int set_memory_array_wc(unsigned long *addr, int addrinarray); | |
53 | int set_memory_array_wt(unsigned long *addr, int addrinarray); | |
54 | int set_memory_array_wb(unsigned long *addr, int addrinarray); | |
55 | ||
56 | int set_pages_array_uc(struct page **pages, int addrinarray); | |
57 | int set_pages_array_wc(struct page **pages, int addrinarray); | |
58 | int set_pages_array_wt(struct page **pages, int addrinarray); | |
59 | int 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 | ||
81 | int set_pages_uc(struct page *page, int numpages); | |
82 | int set_pages_wb(struct page *page, int numpages); | |
83 | int set_pages_x(struct page *page, int numpages); | |
84 | int set_pages_nx(struct page *page, int numpages); | |
85 | int set_pages_ro(struct page *page, int numpages); | |
86 | int set_pages_rw(struct page *page, int numpages); | |
87 | ||
88 | ||
89 | void clflush_cache_range(void *addr, unsigned int size); | |
90 | ||
91 | #ifdef CONFIG_DEBUG_RODATA | |
92 | void mark_rodata_ro(void); | |
93 | extern const int rodata_test_data; | |
94 | extern int kernel_set_to_readonly; | |
95 | void set_kernel_text_rw(void); | |
96 | void set_kernel_text_ro(void); | |
97 | #else | |
98 | static inline void set_kernel_text_rw(void) { } | |
99 | static inline void set_kernel_text_ro(void) { } | |
100 | #endif | |
101 | ||
102 | #ifdef CONFIG_DEBUG_RODATA_TEST | |
103 | int rodata_test(void); | |
104 | #else | |
105 | static inline int rodata_test(void) | |
106 | { | |
107 | return 0; | |
108 | } | |
109 | #endif | |
110 | ||
111 | #endif /* _ASM_X86_CACHEFLUSH_H */ |