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