Linux kernel mirror (for testing)
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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_icache_all() flush the entire instruction cache
29 * - flush_data_cache_page() flushes a page from the data cache
30 * - __flush_icache_user_range(start, end) flushes range of user instructions
31 */
32
33 /*
34 * This flag is used to indicate that the page pointed to by a pte
35 * is dirty and requires cleaning before returning it to the user.
36 */
37#define PG_dcache_dirty PG_arch_1
38
39#define folio_test_dcache_dirty(folio) \
40 test_bit(PG_dcache_dirty, &(folio)->flags)
41#define folio_set_dcache_dirty(folio) \
42 set_bit(PG_dcache_dirty, &(folio)->flags)
43#define folio_clear_dcache_dirty(folio) \
44 clear_bit(PG_dcache_dirty, &(folio)->flags)
45
46extern void (*flush_cache_all)(void);
47extern void (*__flush_cache_all)(void);
48extern void (*flush_cache_mm)(struct mm_struct *mm);
49#define flush_cache_dup_mm(mm) do { (void) (mm); } while (0)
50extern void (*flush_cache_range)(struct vm_area_struct *vma,
51 unsigned long start, unsigned long end);
52extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
53extern void __flush_dcache_pages(struct page *page, unsigned int nr);
54
55#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
56static inline void flush_dcache_folio(struct folio *folio)
57{
58 if (cpu_has_dc_aliases)
59 __flush_dcache_pages(&folio->page, folio_nr_pages(folio));
60 else if (!cpu_has_ic_fills_f_dc)
61 folio_set_dcache_dirty(folio);
62}
63#define flush_dcache_folio flush_dcache_folio
64
65static inline void flush_dcache_page(struct page *page)
66{
67 if (cpu_has_dc_aliases)
68 __flush_dcache_pages(page, 1);
69 else if (!cpu_has_ic_fills_f_dc)
70 folio_set_dcache_dirty(page_folio(page));
71}
72
73#define flush_dcache_mmap_lock(mapping) do { } while (0)
74#define flush_dcache_mmap_unlock(mapping) do { } while (0)
75
76#define ARCH_HAS_FLUSH_ANON_PAGE
77extern void __flush_anon_page(struct page *, unsigned long);
78static inline void flush_anon_page(struct vm_area_struct *vma,
79 struct page *page, unsigned long vmaddr)
80{
81 if (cpu_has_dc_aliases && PageAnon(page))
82 __flush_anon_page(page, vmaddr);
83}
84
85extern void (*flush_icache_range)(unsigned long start, unsigned long end);
86extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
87extern void (*__flush_icache_user_range)(unsigned long start,
88 unsigned long end);
89extern void (*__local_flush_icache_user_range)(unsigned long start,
90 unsigned long end);
91
92extern void (*__flush_cache_vmap)(void);
93
94static inline void flush_cache_vmap(unsigned long start, unsigned long end)
95{
96 if (cpu_has_dc_aliases)
97 __flush_cache_vmap();
98}
99
100extern void (*__flush_cache_vunmap)(void);
101
102static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
103{
104 if (cpu_has_dc_aliases)
105 __flush_cache_vunmap();
106}
107
108extern void copy_to_user_page(struct vm_area_struct *vma,
109 struct page *page, unsigned long vaddr, void *dst, const void *src,
110 unsigned long len);
111
112extern void copy_from_user_page(struct vm_area_struct *vma,
113 struct page *page, unsigned long vaddr, void *dst, const void *src,
114 unsigned long len);
115
116extern void (*flush_icache_all)(void);
117extern void (*flush_data_cache_page)(unsigned long addr);
118
119/* Run kernel code uncached, useful for cache probing functions. */
120unsigned long run_uncached(void *func);
121
122extern void *kmap_coherent(struct page *page, unsigned long addr);
123extern void kunmap_coherent(void);
124extern void *kmap_noncoherent(struct page *page, unsigned long addr);
125
126static inline void kunmap_noncoherent(void)
127{
128 kunmap_coherent();
129}
130
131#define ARCH_IMPLEMENTS_FLUSH_KERNEL_VMAP_RANGE 1
132/*
133 * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
134 * cache writeback and invalidate operation.
135 */
136extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
137
138static inline void flush_kernel_vmap_range(void *vaddr, int size)
139{
140 if (cpu_has_dc_aliases)
141 __flush_kernel_vmap_range((unsigned long) vaddr, size);
142}
143
144static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
145{
146 if (cpu_has_dc_aliases)
147 __flush_kernel_vmap_range((unsigned long) vaddr, size);
148}
149
150#endif /* _ASM_CACHEFLUSH_H */