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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
299878ba LA |
2 | #ifndef _ASM_X86_SET_MEMORY_H |
3 | #define _ASM_X86_SET_MEMORY_H | |
4 | ||
5 | #include <asm/page.h> | |
6 | #include <asm-generic/set_memory.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 | |
77bd2342 | 15 | * Encryption : Encrypted, Decrypted |
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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 | ||
37 | int _set_memory_uc(unsigned long addr, int numpages); | |
38 | int _set_memory_wc(unsigned long addr, int numpages); | |
39 | int _set_memory_wt(unsigned long addr, int numpages); | |
40 | int _set_memory_wb(unsigned long addr, int numpages); | |
41 | int set_memory_uc(unsigned long addr, int numpages); | |
42 | int set_memory_wc(unsigned long addr, int numpages); | |
43 | int set_memory_wt(unsigned long addr, int numpages); | |
44 | int set_memory_wb(unsigned long addr, int numpages); | |
45 | int set_memory_np(unsigned long addr, int numpages); | |
46 | int set_memory_4k(unsigned long addr, int numpages); | |
77bd2342 TL |
47 | int set_memory_encrypted(unsigned long addr, int numpages); |
48 | int set_memory_decrypted(unsigned long addr, int numpages); | |
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49 | |
50 | int set_memory_array_uc(unsigned long *addr, int addrinarray); | |
51 | int set_memory_array_wc(unsigned long *addr, int addrinarray); | |
52 | int set_memory_array_wt(unsigned long *addr, int addrinarray); | |
53 | int set_memory_array_wb(unsigned long *addr, int addrinarray); | |
54 | ||
55 | int set_pages_array_uc(struct page **pages, int addrinarray); | |
56 | int set_pages_array_wc(struct page **pages, int addrinarray); | |
57 | int set_pages_array_wt(struct page **pages, int addrinarray); | |
58 | int set_pages_array_wb(struct page **pages, int addrinarray); | |
59 | ||
60 | /* | |
61 | * For legacy compatibility with the old APIs, a few functions | |
62 | * are provided that work on a "struct page". | |
63 | * These functions operate ONLY on the 1:1 kernel mapping of the | |
64 | * memory that the struct page represents, and internally just | |
65 | * call the set_memory_* function. See the description of the | |
66 | * set_memory_* function for more details on conventions. | |
67 | * | |
68 | * These APIs should be considered *deprecated* and are likely going to | |
69 | * be removed in the future. | |
70 | * The reason for this is the implicit operation on the 1:1 mapping only, | |
71 | * making this not a generally useful API. | |
72 | * | |
73 | * Specifically, many users of the old APIs had a virtual address, | |
74 | * called virt_to_page() or vmalloc_to_page() on that address to | |
75 | * get a struct page* that the old API required. | |
76 | * To convert these cases, use set_memory_*() on the original | |
77 | * virtual address, do not use these functions. | |
78 | */ | |
79 | ||
80 | int set_pages_uc(struct page *page, int numpages); | |
81 | int set_pages_wb(struct page *page, int numpages); | |
82 | int set_pages_x(struct page *page, int numpages); | |
83 | int set_pages_nx(struct page *page, int numpages); | |
84 | int set_pages_ro(struct page *page, int numpages); | |
85 | int set_pages_rw(struct page *page, int numpages); | |
86 | ||
87 | extern int kernel_set_to_readonly; | |
88 | void set_kernel_text_rw(void); | |
89 | void set_kernel_text_ro(void); | |
90 | ||
91 | #endif /* _ASM_X86_SET_MEMORY_H */ |