1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9 #ifndef _ASM_CACHEFLUSH_H
10 #define _ASM_CACHEFLUSH_H
11
12 /* Keep includes the same across arches. */
13 #include <linux/mm.h>
14 #include <asm/cpu-features.h>
15
16 /* Cache flushing:
17 *
18 * - flush_cache_all() flushes entire cache
19 * - flush_cache_mm(mm) flushes the specified mm context's cache lines
20 * - flush_cache_dup mm(mm) handles cache flushing when forking
21 * - flush_cache_page(mm, vmaddr, pfn) flushes a single page
22 * - flush_cache_range(vma, start, end) flushes a range of pages
23 * - flush_icache_range(start, end) flush a range of instructions
24 * - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
25 *
26 * MIPS specific flush operations:
27 *
28 * - flush_cache_sigtramp() flush signal trampoline
29 * - flush_icache_all() flush the entire instruction cache
30 * - flush_data_cache_page() flushes a page from the data cache
31 */
32 extern void (*flush_cache_all)(void);
33 extern void (*__flush_cache_all)(void);
34 extern void (*flush_cache_mm)(struct mm_struct *mm);
35 #define flush_cache_dup_mm(mm) do { (void) (mm); } while (0)
36 extern void (*flush_cache_range)(struct vm_area_struct *vma,
37 unsigned long start, unsigned long end);
38 extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
39 extern void __flush_dcache_page(struct page *page);
40
41 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
flush_dcache_page(struct page * page)42 static inline void flush_dcache_page(struct page *page)
43 {
44 if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
45 __flush_dcache_page(page);
46
47 }
48
49 #define flush_dcache_mmap_lock(mapping) do { } while (0)
50 #define flush_dcache_mmap_unlock(mapping) do { } while (0)
51
52 #define ARCH_HAS_FLUSH_ANON_PAGE
53 extern void __flush_anon_page(struct page *, unsigned long);
flush_anon_page(struct vm_area_struct * vma,struct page * page,unsigned long vmaddr)54 static inline void flush_anon_page(struct vm_area_struct *vma,
55 struct page *page, unsigned long vmaddr)
56 {
57 if (cpu_has_dc_aliases && PageAnon(page))
58 __flush_anon_page(page, vmaddr);
59 }
60
flush_icache_page(struct vm_area_struct * vma,struct page * page)61 static inline void flush_icache_page(struct vm_area_struct *vma,
62 struct page *page)
63 {
64 }
65
66 extern void (*flush_icache_range)(unsigned long start, unsigned long end);
67 extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
68
69 extern void (*__flush_cache_vmap)(void);
70
flush_cache_vmap(unsigned long start,unsigned long end)71 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
72 {
73 if (cpu_has_dc_aliases)
74 __flush_cache_vmap();
75 }
76
77 extern void (*__flush_cache_vunmap)(void);
78
flush_cache_vunmap(unsigned long start,unsigned long end)79 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
80 {
81 if (cpu_has_dc_aliases)
82 __flush_cache_vunmap();
83 }
84
85 extern void copy_to_user_page(struct vm_area_struct *vma,
86 struct page *page, unsigned long vaddr, void *dst, const void *src,
87 unsigned long len);
88
89 extern void copy_from_user_page(struct vm_area_struct *vma,
90 struct page *page, unsigned long vaddr, void *dst, const void *src,
91 unsigned long len);
92
93 extern void (*flush_cache_sigtramp)(unsigned long addr);
94 extern void (*flush_icache_all)(void);
95 extern void (*local_flush_data_cache_page)(void * addr);
96 extern void (*flush_data_cache_page)(unsigned long addr);
97
98 /*
99 * This flag is used to indicate that the page pointed to by a pte
100 * is dirty and requires cleaning before returning it to the user.
101 */
102 #define PG_dcache_dirty PG_arch_1
103
104 #define Page_dcache_dirty(page) \
105 test_bit(PG_dcache_dirty, &(page)->flags)
106 #define SetPageDcacheDirty(page) \
107 set_bit(PG_dcache_dirty, &(page)->flags)
108 #define ClearPageDcacheDirty(page) \
109 clear_bit(PG_dcache_dirty, &(page)->flags)
110
111 /* Run kernel code uncached, useful for cache probing functions. */
112 unsigned long run_uncached(void *func);
113
114 extern void *kmap_coherent(struct page *page, unsigned long addr);
115 extern void kunmap_coherent(void);
116
117 #endif /* _ASM_CACHEFLUSH_H */
118