1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_SET_MEMORY_H 3 #define _ASM_X86_SET_MEMORY_H 4 5 #include <linux/mm.h> 6 #include <asm/page.h> 7 #include <asm-generic/set_memory.h> 8 9 #define set_memory_rox set_memory_rox 10 int set_memory_rox(unsigned long addr, int numpages); 11 12 /* 13 * The set_memory_* API can be used to change various attributes of a virtual 14 * address range. The attributes include: 15 * Cacheability : UnCached, WriteCombining, WriteThrough, WriteBack 16 * Executability : eXecutable, NoteXecutable 17 * Read/Write : ReadOnly, ReadWrite 18 * Presence : NotPresent 19 * Encryption : Encrypted, Decrypted 20 * 21 * Within a category, the attributes are mutually exclusive. 22 * 23 * The implementation of this API will take care of various aspects that 24 * are associated with changing such attributes, such as: 25 * - Flushing TLBs 26 * - Flushing CPU caches 27 * - Making sure aliases of the memory behind the mapping don't violate 28 * coherency rules as defined by the CPU in the system. 29 * 30 * What this API does not do: 31 * - Provide exclusion between various callers - including callers that 32 * operation on other mappings of the same physical page 33 * - Restore default attributes when a page is freed 34 * - Guarantee that mappings other than the requested one are 35 * in any state, other than that these do not violate rules for 36 * the CPU you have. Do not depend on any effects on other mappings, 37 * CPUs other than the one you have may have more relaxed rules. 38 * The caller is required to take care of these. 39 */ 40 41 int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot); 42 int _set_memory_uc(unsigned long addr, int numpages); 43 int _set_memory_wc(unsigned long addr, int numpages); 44 int _set_memory_wt(unsigned long addr, int numpages); 45 int _set_memory_wb(unsigned long addr, int numpages); 46 int set_memory_uc(unsigned long addr, int numpages); 47 int set_memory_wc(unsigned long addr, int numpages); 48 int set_memory_wb(unsigned long addr, int numpages); 49 int set_memory_np(unsigned long addr, int numpages); 50 int set_memory_p(unsigned long addr, int numpages); 51 int set_memory_4k(unsigned long addr, int numpages); 52 53 bool set_memory_enc_stop_conversion(void); 54 int set_memory_encrypted(unsigned long addr, int numpages); 55 int set_memory_decrypted(unsigned long addr, int numpages); 56 57 int set_memory_np_noalias(unsigned long addr, int numpages); 58 int set_memory_nonglobal(unsigned long addr, int numpages); 59 int set_memory_global(unsigned long addr, int numpages); 60 61 int set_pages_array_uc(struct page **pages, int addrinarray); 62 int set_pages_array_wc(struct page **pages, int addrinarray); 63 int set_pages_array_wb(struct page **pages, int addrinarray); 64 65 /* 66 * For legacy compatibility with the old APIs, a few functions 67 * are provided that work on a "struct page". 68 * These functions operate ONLY on the 1:1 kernel mapping of the 69 * memory that the struct page represents, and internally just 70 * call the set_memory_* function. See the description of the 71 * set_memory_* function for more details on conventions. 72 * 73 * These APIs should be considered *deprecated* and are likely going to 74 * be removed in the future. 75 * The reason for this is the implicit operation on the 1:1 mapping only, 76 * making this not a generally useful API. 77 * 78 * Specifically, many users of the old APIs had a virtual address, 79 * called virt_to_page() or vmalloc_to_page() on that address to 80 * get a struct page* that the old API required. 81 * To convert these cases, use set_memory_*() on the original 82 * virtual address, do not use these functions. 83 */ 84 85 int set_pages_uc(struct page *page, int numpages); 86 int set_pages_wb(struct page *page, int numpages); 87 int set_pages_ro(struct page *page, int numpages); 88 int set_pages_rw(struct page *page, int numpages); 89 90 int set_direct_map_invalid_noflush(struct page *page); 91 int set_direct_map_default_noflush(struct page *page); 92 bool kernel_page_present(struct page *page); 93 94 extern int kernel_set_to_readonly; 95 96 #endif /* _ASM_X86_SET_MEMORY_H */ 97
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