Linux kernel mirror (for testing)
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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
28/*
29 * The set_memory_* API can be used to change various attributes of a virtual
30 * address range. The attributes include:
31 * Cachability : UnCached, WriteCombining, WriteBack
32 * Executability : eXeutable, NoteXecutable
33 * Read/Write : ReadOnly, ReadWrite
34 * Presence : NotPresent
35 *
36 * Within a catagory, the attributes are mutually exclusive.
37 *
38 * The implementation of this API will take care of various aspects that
39 * are associated with changing such attributes, such as:
40 * - Flushing TLBs
41 * - Flushing CPU caches
42 * - Making sure aliases of the memory behind the mapping don't violate
43 * coherency rules as defined by the CPU in the system.
44 *
45 * What this API does not do:
46 * - Provide exclusion between various callers - including callers that
47 * operation on other mappings of the same physical page
48 * - Restore default attributes when a page is freed
49 * - Guarantee that mappings other than the requested one are
50 * in any state, other than that these do not violate rules for
51 * the CPU you have. Do not depend on any effects on other mappings,
52 * CPUs other than the one you have may have more relaxed rules.
53 * The caller is required to take care of these.
54 */
55
56int _set_memory_uc(unsigned long addr, int numpages);
57int _set_memory_wc(unsigned long addr, int numpages);
58int _set_memory_wb(unsigned long addr, int numpages);
59int set_memory_uc(unsigned long addr, int numpages);
60int set_memory_wc(unsigned long addr, int numpages);
61int set_memory_wb(unsigned long addr, int numpages);
62int set_memory_x(unsigned long addr, int numpages);
63int set_memory_nx(unsigned long addr, int numpages);
64int set_memory_ro(unsigned long addr, int numpages);
65int set_memory_rw(unsigned long addr, int numpages);
66int set_memory_np(unsigned long addr, int numpages);
67int set_memory_4k(unsigned long addr, int numpages);
68
69/*
70 * For legacy compatibility with the old APIs, a few functions
71 * are provided that work on a "struct page".
72 * These functions operate ONLY on the 1:1 kernel mapping of the
73 * memory that the struct page represents, and internally just
74 * call the set_memory_* function. See the description of the
75 * set_memory_* function for more details on conventions.
76 *
77 * These APIs should be considered *deprecated* and are likely going to
78 * be removed in the future.
79 * The reason for this is the implicit operation on the 1:1 mapping only,
80 * making this not a generally useful API.
81 *
82 * Specifically, many users of the old APIs had a virtual address,
83 * called virt_to_page() or vmalloc_to_page() on that address to
84 * get a struct page* that the old API required.
85 * To convert these cases, use set_memory_*() on the original
86 * virtual address, do not use these functions.
87 */
88
89int set_pages_uc(struct page *page, int numpages);
90int set_pages_wb(struct page *page, int numpages);
91int set_pages_x(struct page *page, int numpages);
92int set_pages_nx(struct page *page, int numpages);
93int set_pages_ro(struct page *page, int numpages);
94int set_pages_rw(struct page *page, int numpages);
95
96
97void clflush_cache_range(void *addr, unsigned int size);
98
99void cpa_init(void);
100
101#ifdef CONFIG_DEBUG_RODATA
102void mark_rodata_ro(void);
103extern const int rodata_test_data;
104#endif
105
106#ifdef CONFIG_DEBUG_RODATA_TEST
107int rodata_test(void);
108#else
109static inline int rodata_test(void)
110{
111 return 0;
112}
113#endif
114
115#endif