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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. */
8static inline void flush_cache_all(void) { }
9static inline void flush_cache_mm(struct mm_struct *mm) { }
10static inline void flush_cache_dup_mm(struct mm_struct *mm) { }
11static inline void flush_cache_range(struct vm_area_struct *vma,
12 unsigned long start, unsigned long end) { }
13static inline void flush_cache_page(struct vm_area_struct *vma,
14 unsigned long vmaddr, unsigned long pfn) { }
15static inline void flush_dcache_page(struct page *page) { }
16static inline void flush_dcache_mmap_lock(struct address_space *mapping) { }
17static inline void flush_dcache_mmap_unlock(struct address_space *mapping) { }
18static inline void flush_icache_range(unsigned long start,
19 unsigned long end) { }
20static inline void flush_icache_page(struct vm_area_struct *vma,
21 struct page *page) { }
22static inline void flush_icache_user_range(struct vm_area_struct *vma,
23 struct page *page,
24 unsigned long addr,
25 unsigned long len) { }
26static inline void flush_cache_vmap(unsigned long start, unsigned long end) { }
27static inline void flush_cache_vunmap(unsigned long start,
28 unsigned long end) { }
29
30static inline void copy_to_user_page(struct vm_area_struct *vma,
31 struct page *page, unsigned long vaddr,
32 void *dst, const void *src,
33 unsigned long len)
34{
35 memcpy(dst, src, len);
36}
37
38static inline void copy_from_user_page(struct vm_area_struct *vma,
39 struct page *page, unsigned long vaddr,
40 void *dst, const void *src,
41 unsigned long len)
42{
43 memcpy(dst, src, len);
44}
45
46#define PG_WC PG_arch_1
47PAGEFLAG(WC, WC)
48
49#ifdef CONFIG_X86_PAT
50/*
51 * X86 PAT uses page flags WC and Uncached together to keep track of
52 * memory type of pages that have backing page struct. X86 PAT supports 3
53 * different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and
54 * _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not
55 * been changed from its default (value of -1 used to denote this).
56 * Note we do not support _PAGE_CACHE_UC here.
57 *
58 * Caller must hold memtype_lock for atomicity.
59 */
60static inline unsigned long get_page_memtype(struct page *pg)
61{
62 if (!PageUncached(pg) && !PageWC(pg))
63 return -1;
64 else if (!PageUncached(pg) && PageWC(pg))
65 return _PAGE_CACHE_WC;
66 else if (PageUncached(pg) && !PageWC(pg))
67 return _PAGE_CACHE_UC_MINUS;
68 else
69 return _PAGE_CACHE_WB;
70}
71
72static inline void set_page_memtype(struct page *pg, unsigned long memtype)
73{
74 switch (memtype) {
75 case _PAGE_CACHE_WC:
76 ClearPageUncached(pg);
77 SetPageWC(pg);
78 break;
79 case _PAGE_CACHE_UC_MINUS:
80 SetPageUncached(pg);
81 ClearPageWC(pg);
82 break;
83 case _PAGE_CACHE_WB:
84 SetPageUncached(pg);
85 SetPageWC(pg);
86 break;
87 default:
88 case -1:
89 ClearPageUncached(pg);
90 ClearPageWC(pg);
91 break;
92 }
93}
94#else
95static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
96static inline void set_page_memtype(struct page *pg, unsigned long memtype) { }
97#endif
98
99/*
100 * The set_memory_* API can be used to change various attributes of a virtual
101 * address range. The attributes include:
102 * Cachability : UnCached, WriteCombining, WriteBack
103 * Executability : eXeutable, NoteXecutable
104 * Read/Write : ReadOnly, ReadWrite
105 * Presence : NotPresent
106 *
107 * Within a catagory, the attributes are mutually exclusive.
108 *
109 * The implementation of this API will take care of various aspects that
110 * are associated with changing such attributes, such as:
111 * - Flushing TLBs
112 * - Flushing CPU caches
113 * - Making sure aliases of the memory behind the mapping don't violate
114 * coherency rules as defined by the CPU in the system.
115 *
116 * What this API does not do:
117 * - Provide exclusion between various callers - including callers that
118 * operation on other mappings of the same physical page
119 * - Restore default attributes when a page is freed
120 * - Guarantee that mappings other than the requested one are
121 * in any state, other than that these do not violate rules for
122 * the CPU you have. Do not depend on any effects on other mappings,
123 * CPUs other than the one you have may have more relaxed rules.
124 * The caller is required to take care of these.
125 */
126
127int _set_memory_uc(unsigned long addr, int numpages);
128int _set_memory_wc(unsigned long addr, int numpages);
129int _set_memory_wb(unsigned long addr, int numpages);
130int set_memory_uc(unsigned long addr, int numpages);
131int set_memory_wc(unsigned long addr, int numpages);
132int set_memory_wb(unsigned long addr, int numpages);
133int set_memory_x(unsigned long addr, int numpages);
134int set_memory_nx(unsigned long addr, int numpages);
135int set_memory_ro(unsigned long addr, int numpages);
136int set_memory_rw(unsigned long addr, int numpages);
137int set_memory_np(unsigned long addr, int numpages);
138int set_memory_4k(unsigned long addr, int numpages);
139
140int set_memory_array_uc(unsigned long *addr, int addrinarray);
141int set_memory_array_wb(unsigned long *addr, int addrinarray);
142
143int set_pages_array_uc(struct page **pages, int addrinarray);
144int set_pages_array_wb(struct page **pages, int addrinarray);
145
146/*
147 * For legacy compatibility with the old APIs, a few functions
148 * are provided that work on a "struct page".
149 * These functions operate ONLY on the 1:1 kernel mapping of the
150 * memory that the struct page represents, and internally just
151 * call the set_memory_* function. See the description of the
152 * set_memory_* function for more details on conventions.
153 *
154 * These APIs should be considered *deprecated* and are likely going to
155 * be removed in the future.
156 * The reason for this is the implicit operation on the 1:1 mapping only,
157 * making this not a generally useful API.
158 *
159 * Specifically, many users of the old APIs had a virtual address,
160 * called virt_to_page() or vmalloc_to_page() on that address to
161 * get a struct page* that the old API required.
162 * To convert these cases, use set_memory_*() on the original
163 * virtual address, do not use these functions.
164 */
165
166int set_pages_uc(struct page *page, int numpages);
167int set_pages_wb(struct page *page, int numpages);
168int set_pages_x(struct page *page, int numpages);
169int set_pages_nx(struct page *page, int numpages);
170int set_pages_ro(struct page *page, int numpages);
171int set_pages_rw(struct page *page, int numpages);
172
173
174void clflush_cache_range(void *addr, unsigned int size);
175
176#ifdef CONFIG_DEBUG_RODATA
177void mark_rodata_ro(void);
178extern const int rodata_test_data;
179void set_kernel_text_rw(void);
180void set_kernel_text_ro(void);
181#else
182static inline void set_kernel_text_rw(void) { }
183static inline void set_kernel_text_ro(void) { }
184#endif
185
186#ifdef CONFIG_DEBUG_RODATA_TEST
187int rodata_test(void);
188#else
189static inline int rodata_test(void)
190{
191 return 0;
192}
193#endif
194
195#endif /* _ASM_X86_CACHEFLUSH_H */