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_page(mm, vmaddr, pfn) flushes a single page
21 * - flush_cache_range(vma, start, end) flushes a range of pages
22 * - flush_icache_range(start, end) flush a range of instructions
23 * - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
24 * - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
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);
35extern void (*flush_cache_range)(struct vm_area_struct *vma,
36 unsigned long start, unsigned long end);
37extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
38extern void __flush_dcache_page(struct page *page);
39
40static inline void flush_dcache_page(struct page *page)
41{
42 if (cpu_has_dc_aliases)
43 __flush_dcache_page(page);
44
45}
46
47#define flush_dcache_mmap_lock(mapping) do { } while (0)
48#define flush_dcache_mmap_unlock(mapping) do { } while (0)
49
50extern void (*flush_icache_page)(struct vm_area_struct *vma,
51 struct page *page);
52extern void (*flush_icache_range)(unsigned long __user start,
53 unsigned long __user end);
54#define flush_cache_vmap(start, end) flush_cache_all()
55#define flush_cache_vunmap(start, end) flush_cache_all()
56
57static inline void copy_to_user_page(struct vm_area_struct *vma,
58 struct page *page, unsigned long vaddr, void *dst, const void *src,
59 unsigned long len)
60{
61 if (cpu_has_dc_aliases)
62 flush_cache_page(vma, vaddr, page_to_pfn(page));
63 memcpy(dst, src, len);
64 flush_icache_page(vma, page);
65}
66
67static inline void copy_from_user_page(struct vm_area_struct *vma,
68 struct page *page, unsigned long vaddr, void *dst, const void *src,
69 unsigned long len)
70{
71 if (cpu_has_dc_aliases)
72 flush_cache_page(vma, vaddr, page_to_pfn(page));
73 memcpy(dst, src, len);
74}
75
76extern void (*flush_cache_sigtramp)(unsigned long addr);
77extern void (*flush_icache_all)(void);
78extern void (*flush_data_cache_page)(unsigned long addr);
79
80/*
81 * This flag is used to indicate that the page pointed to by a pte
82 * is dirty and requires cleaning before returning it to the user.
83 */
84#define PG_dcache_dirty PG_arch_1
85
86#define Page_dcache_dirty(page) \
87 test_bit(PG_dcache_dirty, &(page)->flags)
88#define SetPageDcacheDirty(page) \
89 set_bit(PG_dcache_dirty, &(page)->flags)
90#define ClearPageDcacheDirty(page) \
91 clear_bit(PG_dcache_dirty, &(page)->flags)
92
93/* Run kernel code uncached, useful for cache probing functions. */
94unsigned long __init run_uncached(void *func);
95
96#endif /* _ASM_CACHEFLUSH_H */