1 /* SPDX-License-Identifier: GPL-2.0 */ 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 #define set_memory_rox set_memory_rox 9 int set_memory_rox(unsigned long addr, int numpages); 10 11 /* 12 * The set_memory_* API can be used to change various attributes of a virtual 13 * address range. The attributes include: 14 * Cacheability : UnCached, WriteCombining, WriteThrough, WriteBack 15 * Executability : eXecutable, NoteXecutable 16 * Read/Write : ReadOnly, ReadWrite 17 * Presence : NotPresent 18 * Encryption : Encrypted, Decrypted 19 * 20 * Within a category, the attributes are mutually exclusive. 21 * 22 * The implementation of this API will take care of various aspects that 23 * are associated with changing such attributes, such as: 24 * - Flushing TLBs 25 * - Flushing CPU caches 26 * - Making sure aliases of the memory behind the mapping don't violate 27 * coherency rules as defined by the CPU in the system. 28 * 29 * What this API does not do: 30 * - Provide exclusion between various callers - including callers that 31 * operation on other mappings of the same physical page 32 * - Restore default attributes when a page is freed 33 * - Guarantee that mappings other than the requested one are 34 * in any state, other than that these do not violate rules for 35 * the CPU you have. Do not depend on any effects on other mappings, 36 * CPUs other than the one you have may have more relaxed rules. 37 * The caller is required to take care of these. 38 */ 39 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_uc(unsigned long addr, int numpages); 45 int set_memory_wc(unsigned long addr, int numpages); 46 int set_memory_wb(unsigned long addr, int numpages); 47 int set_memory_np(unsigned long addr, int numpages); 48 int set_memory_p(unsigned long addr, int numpages); 49 int set_memory_4k(unsigned long addr, int numpages); 50 51 bool set_memory_enc_stop_conversion(void); 52 int set_memory_encrypted(unsigned long addr, int numpages); 53 int set_memory_decrypted(unsigned long addr, int numpages); 54 55 int set_memory_np_noalias(unsigned long addr, int numpages); 56 int set_memory_nonglobal(unsigned long addr, int numpages); 57 int set_memory_global(unsigned long addr, int numpages); 58 59 int set_pages_array_uc(struct page **pages, int addrinarray); 60 int set_pages_array_wc(struct page **pages, int addrinarray); 61 int set_pages_array_wb(struct page **pages, int addrinarray); 62 63 /* 64 * For legacy compatibility with the old APIs, a few functions 65 * are provided that work on a "struct page". 66 * These functions operate ONLY on the 1:1 kernel mapping of the 67 * memory that the struct page represents, and internally just 68 * call the set_memory_* function. See the description of the 69 * set_memory_* function for more details on conventions. 70 * 71 * These APIs should be considered *deprecated* and are likely going to 72 * be removed in the future. 73 * The reason for this is the implicit operation on the 1:1 mapping only, 74 * making this not a generally useful API. 75 * 76 * Specifically, many users of the old APIs had a virtual address, 77 * called virt_to_page() or vmalloc_to_page() on that address to 78 * get a struct page* that the old API required. 79 * To convert these cases, use set_memory_*() on the original 80 * virtual address, do not use these functions. 81 */ 82 83 int set_pages_uc(struct page *page, int numpages); 84 int set_pages_wb(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 int set_direct_map_invalid_noflush(struct page *page); 89 int set_direct_map_default_noflush(struct page *page); 90 int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid); 91 bool kernel_page_present(struct page *page); 92 93 extern int kernel_set_to_readonly; 94 95 #endif /* _ASM_X86_SET_MEMORY_H */ 96