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