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 */
32extern void (*flush_cache_all)(void);
33extern void (*__flush_cache_all)(void);
34extern void (*flush_cache_mm)(struct mm_struct *mm);
35#define flush_cache_dup_mm(mm)	do { (void) (mm); } while (0)
36extern void (*flush_cache_range)(struct vm_area_struct *vma,
37	unsigned long start, unsigned long end);
38extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
39extern void __flush_dcache_page(struct page *page);
40
41#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
42static 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
53extern void __flush_anon_page(struct page *, unsigned long);
54static 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
61static inline void flush_icache_page(struct vm_area_struct *vma,
62	struct page *page)
63{
64}
65
66extern void (*flush_icache_range)(unsigned long start, unsigned long end);
67extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
68
69extern void (*__flush_cache_vmap)(void);
70
71static inline void flush_cache_vmap(unsigned long start, unsigned long end)
72{
73	if (cpu_has_dc_aliases)
74		__flush_cache_vmap();
75}
76
77extern void (*__flush_cache_vunmap)(void);
78
79static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
80{
81	if (cpu_has_dc_aliases)
82		__flush_cache_vunmap();
83}
84
85extern 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
89extern 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
93extern void (*flush_cache_sigtramp)(unsigned long addr);
94extern void (*flush_icache_all)(void);
95extern void (*local_flush_data_cache_page)(void * addr);
96extern 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. */
112unsigned long run_uncached(void *func);
113
114extern void *kmap_coherent(struct page *page, unsigned long addr);
115extern void kunmap_coherent(void);
116extern void *kmap_noncoherent(struct page *page, unsigned long addr);
117
118static inline void kunmap_noncoherent(void)
119{
120	kunmap_coherent();
121}
122
123#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
124static inline void flush_kernel_dcache_page(struct page *page)
125{
126	BUG_ON(cpu_has_dc_aliases && PageHighMem(page));
127}
128
129/*
130 * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
131 * cache writeback and invalidate operation.
132 */
133extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
134
135static inline void flush_kernel_vmap_range(void *vaddr, int size)
136{
137	if (cpu_has_dc_aliases)
138		__flush_kernel_vmap_range((unsigned long) vaddr, size);
139}
140
141static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
142{
143	if (cpu_has_dc_aliases)
144		__flush_kernel_vmap_range((unsigned long) vaddr, size);
145}
146
147#endif /* _ASM_CACHEFLUSH_H */
148