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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef _ASM_X86_CACHEFLUSH_H
2#define _ASM_X86_CACHEFLUSH_H
3
4/* Keep includes the same across arches. */
5#include <linux/mm.h>
6
7/* Caches aren't brain-dead on the intel. */
8#define flush_cache_all() do { } while (0)
9#define flush_cache_mm(mm) do { } while (0)
10#define flush_cache_dup_mm(mm) do { } while (0)
11#define flush_cache_range(vma, start, end) do { } while (0)
12#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
13#define flush_dcache_page(page) do { } while (0)
14#define flush_dcache_mmap_lock(mapping) do { } while (0)
15#define flush_dcache_mmap_unlock(mapping) do { } while (0)
16#define flush_icache_range(start, end) do { } while (0)
17#define flush_icache_page(vma, pg) do { } while (0)
18#define flush_icache_user_range(vma, pg, adr, len) do { } while (0)
19#define flush_cache_vmap(start, end) do { } while (0)
20#define flush_cache_vunmap(start, end) do { } while (0)
21
22#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
23 memcpy((dst), (src), (len))
24#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
25 memcpy((dst), (src), (len))
26
27#define PG_non_WB PG_arch_1
28PAGEFLAG(NonWB, non_WB)
29
30/*
31 * The set_memory_* API can be used to change various attributes of a virtual
32 * address range. The attributes include:
33 * Cachability : UnCached, WriteCombining, WriteBack
34 * Executability : eXeutable, NoteXecutable
35 * Read/Write : ReadOnly, ReadWrite
36 * Presence : NotPresent
37 *
38 * Within a catagory, the attributes are mutually exclusive.
39 *
40 * The implementation of this API will take care of various aspects that
41 * are associated with changing such attributes, such as:
42 * - Flushing TLBs
43 * - Flushing CPU caches
44 * - Making sure aliases of the memory behind the mapping don't violate
45 * coherency rules as defined by the CPU in the system.
46 *
47 * What this API does not do:
48 * - Provide exclusion between various callers - including callers that
49 * operation on other mappings of the same physical page
50 * - Restore default attributes when a page is freed
51 * - Guarantee that mappings other than the requested one are
52 * in any state, other than that these do not violate rules for
53 * the CPU you have. Do not depend on any effects on other mappings,
54 * CPUs other than the one you have may have more relaxed rules.
55 * The caller is required to take care of these.
56 */
57
58int _set_memory_uc(unsigned long addr, int numpages);
59int _set_memory_wc(unsigned long addr, int numpages);
60int _set_memory_wb(unsigned long addr, int numpages);
61int set_memory_uc(unsigned long addr, int numpages);
62int set_memory_wc(unsigned long addr, int numpages);
63int set_memory_wb(unsigned long addr, int numpages);
64int set_memory_x(unsigned long addr, int numpages);
65int set_memory_nx(unsigned long addr, int numpages);
66int set_memory_ro(unsigned long addr, int numpages);
67int set_memory_rw(unsigned long addr, int numpages);
68int set_memory_np(unsigned long addr, int numpages);
69int set_memory_4k(unsigned long addr, int numpages);
70
71int set_memory_array_uc(unsigned long *addr, int addrinarray);
72int set_memory_array_wb(unsigned long *addr, int addrinarray);
73
74/*
75 * For legacy compatibility with the old APIs, a few functions
76 * are provided that work on a "struct page".
77 * These functions operate ONLY on the 1:1 kernel mapping of the
78 * memory that the struct page represents, and internally just
79 * call the set_memory_* function. See the description of the
80 * set_memory_* function for more details on conventions.
81 *
82 * These APIs should be considered *deprecated* and are likely going to
83 * be removed in the future.
84 * The reason for this is the implicit operation on the 1:1 mapping only,
85 * making this not a generally useful API.
86 *
87 * Specifically, many users of the old APIs had a virtual address,
88 * called virt_to_page() or vmalloc_to_page() on that address to
89 * get a struct page* that the old API required.
90 * To convert these cases, use set_memory_*() on the original
91 * virtual address, do not use these functions.
92 */
93
94int set_pages_uc(struct page *page, int numpages);
95int set_pages_wb(struct page *page, int numpages);
96int set_pages_x(struct page *page, int numpages);
97int set_pages_nx(struct page *page, int numpages);
98int set_pages_ro(struct page *page, int numpages);
99int set_pages_rw(struct page *page, int numpages);
100
101
102void clflush_cache_range(void *addr, unsigned int size);
103
104#ifdef CONFIG_DEBUG_RODATA
105void mark_rodata_ro(void);
106extern const int rodata_test_data;
107#endif
108
109#ifdef CONFIG_DEBUG_RODATA_TEST
110int rodata_test(void);
111#else
112static inline int rodata_test(void)
113{
114 return 0;
115}
116#endif
117
118#endif /* _ASM_X86_CACHEFLUSH_H */