Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
41static inline void flush_dcache_page(struct page *page)
42{
43 if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
44 __flush_dcache_page(page);
45
46}
47
48#define flush_dcache_mmap_lock(mapping) do { } while (0)
49#define flush_dcache_mmap_unlock(mapping) do { } while (0)
50
51#define ARCH_HAS_FLUSH_ANON_PAGE
52extern void __flush_anon_page(struct page *, unsigned long);
53static inline void flush_anon_page(struct vm_area_struct *vma,
54 struct page *page, unsigned long vmaddr)
55{
56 if (cpu_has_dc_aliases && PageAnon(page))
57 __flush_anon_page(page, vmaddr);
58}
59
60static inline void flush_icache_page(struct vm_area_struct *vma,
61 struct page *page)
62{
63}
64
65extern void (*flush_icache_range)(unsigned long start, unsigned long end);
66#define flush_cache_vmap(start, end) flush_cache_all()
67#define flush_cache_vunmap(start, end) flush_cache_all()
68
69extern void copy_to_user_page(struct vm_area_struct *vma,
70 struct page *page, unsigned long vaddr, void *dst, const void *src,
71 unsigned long len);
72
73extern void copy_from_user_page(struct vm_area_struct *vma,
74 struct page *page, unsigned long vaddr, void *dst, const void *src,
75 unsigned long len);
76
77extern void (*flush_cache_sigtramp)(unsigned long addr);
78extern void (*flush_icache_all)(void);
79extern void (*local_flush_data_cache_page)(void * addr);
80extern void (*flush_data_cache_page)(unsigned long addr);
81
82/*
83 * This flag is used to indicate that the page pointed to by a pte
84 * is dirty and requires cleaning before returning it to the user.
85 */
86#define PG_dcache_dirty PG_arch_1
87
88#define Page_dcache_dirty(page) \
89 test_bit(PG_dcache_dirty, &(page)->flags)
90#define SetPageDcacheDirty(page) \
91 set_bit(PG_dcache_dirty, &(page)->flags)
92#define ClearPageDcacheDirty(page) \
93 clear_bit(PG_dcache_dirty, &(page)->flags)
94
95/* Run kernel code uncached, useful for cache probing functions. */
96unsigned long __init run_uncached(void *func);
97
98extern void *kmap_coherent(struct page *page, unsigned long addr);
99extern void kunmap_coherent(struct page *page);
100
101#endif /* _ASM_CACHEFLUSH_H */