1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SET_MEMORY_H
3 #define _ASM_X86_SET_MEMORY_H
7 #include <asm-generic/set_memory.h>
10 * The set_memory_* API can be used to change various attributes of a virtual
11 * address range. The attributes include:
12 * Cacheability : UnCached, WriteCombining, WriteThrough, WriteBack
13 * Executability : eXecutable, NoteXecutable
14 * Read/Write : ReadOnly, ReadWrite
15 * Presence : NotPresent
16 * Encryption : Encrypted, Decrypted
18 * Within a category, the attributes are mutually exclusive.
20 * The implementation of this API will take care of various aspects that
21 * are associated with changing such attributes, such as:
23 * - Flushing CPU caches
24 * - Making sure aliases of the memory behind the mapping don't violate
25 * coherency rules as defined by the CPU in the system.
27 * What this API does not do:
28 * - Provide exclusion between various callers - including callers that
29 * operation on other mappings of the same physical page
30 * - Restore default attributes when a page is freed
31 * - Guarantee that mappings other than the requested one are
32 * in any state, other than that these do not violate rules for
33 * the CPU you have. Do not depend on any effects on other mappings,
34 * CPUs other than the one you have may have more relaxed rules.
35 * The caller is required to take care of these.
38 int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot);
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_uc(unsigned long addr, int numpages);
44 int set_memory_wc(unsigned long addr, int numpages);
45 int set_memory_wb(unsigned long addr, int numpages);
46 int set_memory_np(unsigned long addr, int numpages);
47 int set_memory_4k(unsigned long addr, int numpages);
48 int set_memory_encrypted(unsigned long addr, int numpages);
49 int set_memory_decrypted(unsigned long addr, int numpages);
50 int set_memory_np_noalias(unsigned long addr, int numpages);
51 int set_memory_nonglobal(unsigned long addr, int numpages);
52 int set_memory_global(unsigned long addr, int numpages);
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_wb(struct page **pages, int addrinarray);
59 * For legacy compatibility with the old APIs, a few functions
60 * are provided that work on a "struct page".
61 * These functions operate ONLY on the 1:1 kernel mapping of the
62 * memory that the struct page represents, and internally just
63 * call the set_memory_* function. See the description of the
64 * set_memory_* function for more details on conventions.
66 * These APIs should be considered *deprecated* and are likely going to
67 * be removed in the future.
68 * The reason for this is the implicit operation on the 1:1 mapping only,
69 * making this not a generally useful API.
71 * Specifically, many users of the old APIs had a virtual address,
72 * called virt_to_page() or vmalloc_to_page() on that address to
73 * get a struct page* that the old API required.
74 * To convert these cases, use set_memory_*() on the original
75 * virtual address, do not use these functions.
78 int set_pages_uc(struct page *page, int numpages);
79 int set_pages_wb(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);
83 int set_direct_map_invalid_noflush(struct page *page);
84 int set_direct_map_default_noflush(struct page *page);
85 bool kernel_page_present(struct page *page);
87 extern int kernel_set_to_readonly;
89 #endif /* _ASM_X86_SET_MEMORY_H */