projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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); | |
| 9c1eedb8 | 49 | int set_memory_np_noalias(unsigned long addr, int numpages); |
| 299878ba LA |
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 | extern int kernel_set_to_readonly; | |
| 89 | void set_kernel_text_rw(void); | |
| 90 | void set_kernel_text_ro(void); | |
| 91 | ||
| 92 | #endif /* _ASM_X86_SET_MEMORY_H */ |