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.f)
41#define folio_set_dcache_dirty(folio) \
42 set_bit(PG_dcache_dirty, &(folio)->flags.f)
43#define folio_clear_dcache_dirty(folio) \
44 clear_bit(PG_dcache_dirty, &(folio)->flags.f)
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);
53void __flush_dcache_folio_pages(struct folio *folio, 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_folio_pages(folio, folio_page(folio, 0),
60 folio_nr_pages(folio));
61 else if (!cpu_has_ic_fills_f_dc)
62 folio_set_dcache_dirty(folio);
63}
64#define flush_dcache_folio flush_dcache_folio
65
66static inline void flush_dcache_page(struct page *page)
67{
68 struct folio *folio = page_folio(page);
69
70 if (cpu_has_dc_aliases)
71 __flush_dcache_folio_pages(folio, page, 1);
72 else if (!cpu_has_ic_fills_f_dc)
73 folio_set_dcache_dirty(folio);
74}
75
76#define flush_dcache_mmap_lock(mapping) do { } while (0)
77#define flush_dcache_mmap_unlock(mapping) do { } while (0)
78
79#define ARCH_HAS_FLUSH_ANON_PAGE
80extern void __flush_anon_page(struct page *, unsigned long);
81static inline void flush_anon_page(struct vm_area_struct *vma,
82 struct page *page, unsigned long vmaddr)
83{
84 if (cpu_has_dc_aliases && PageAnon(page))
85 __flush_anon_page(page, vmaddr);
86}
87
88extern void (*flush_icache_range)(unsigned long start, unsigned long end);
89extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
90extern void (*__flush_icache_user_range)(unsigned long start,
91 unsigned long end);
92extern void (*__local_flush_icache_user_range)(unsigned long start,
93 unsigned long end);
94
95extern void (*__flush_cache_vmap)(void);
96
97static inline void flush_cache_vmap(unsigned long start, unsigned long end)
98{
99 if (cpu_has_dc_aliases)
100 __flush_cache_vmap();
101}
102
103#define flush_cache_vmap_early(start, end) do { } while (0)
104
105extern void (*__flush_cache_vunmap)(void);
106
107static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
108{
109 if (cpu_has_dc_aliases)
110 __flush_cache_vunmap();
111}
112
113extern void copy_to_user_page(struct vm_area_struct *vma,
114 struct page *page, unsigned long vaddr, void *dst, const void *src,
115 unsigned long len);
116
117extern void copy_from_user_page(struct vm_area_struct *vma,
118 struct page *page, unsigned long vaddr, void *dst, const void *src,
119 unsigned long len);
120
121extern void (*flush_icache_all)(void);
122extern void (*flush_data_cache_page)(unsigned long addr);
123
124/* Run kernel code uncached, useful for cache probing functions. */
125unsigned long run_uncached(void *func);
126
127extern void *kmap_coherent(struct page *page, unsigned long addr);
128extern void kunmap_coherent(void);
129extern void *kmap_noncoherent(struct page *page, unsigned long addr);
130
131static inline void kunmap_noncoherent(void)
132{
133 kunmap_coherent();
134}
135
136#define ARCH_IMPLEMENTS_FLUSH_KERNEL_VMAP_RANGE 1
137/*
138 * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
139 * cache writeback and invalidate operation.
140 */
141extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
142
143static inline void flush_kernel_vmap_range(void *vaddr, int size)
144{
145 if (cpu_has_dc_aliases)
146 __flush_kernel_vmap_range((unsigned long) vaddr, size);
147}
148
149static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
150{
151 if (cpu_has_dc_aliases)
152 __flush_kernel_vmap_range((unsigned long) vaddr, size);
153}
154
155#endif /* _ASM_CACHEFLUSH_H */