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