Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * include/asm-xtensa/cacheflush.h
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * (C) 2001 - 2007 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_CACHEFLUSH_H
12#define _XTENSA_CACHEFLUSH_H
13
14#ifdef __KERNEL__
15
16#include <linux/mm.h>
17#include <asm/processor.h>
18#include <asm/page.h>
19
20/*
21 * Lo-level routines for cache flushing.
22 *
23 * invalidate data or instruction cache:
24 *
25 * __invalidate_icache_all()
26 * __invalidate_icache_page(adr)
27 * __invalidate_dcache_page(adr)
28 * __invalidate_icache_range(from,size)
29 * __invalidate_dcache_range(from,size)
30 *
31 * flush data cache:
32 *
33 * __flush_dcache_page(adr)
34 *
35 * flush and invalidate data cache:
36 *
37 * __flush_invalidate_dcache_all()
38 * __flush_invalidate_dcache_page(adr)
39 * __flush_invalidate_dcache_range(from,size)
40 *
41 * specials for cache aliasing:
42 *
43 * __flush_invalidate_dcache_page_alias(vaddr,paddr)
44 * __invalidate_icache_page_alias(vaddr,paddr)
45 */
46
47extern void __invalidate_dcache_all(void);
48extern void __invalidate_icache_all(void);
49extern void __invalidate_dcache_page(unsigned long);
50extern void __invalidate_icache_page(unsigned long);
51extern void __invalidate_icache_range(unsigned long, unsigned long);
52extern void __invalidate_dcache_range(unsigned long, unsigned long);
53
54
55#if XCHAL_DCACHE_IS_WRITEBACK
56extern void __flush_invalidate_dcache_all(void);
57extern void __flush_dcache_page(unsigned long);
58extern void __flush_dcache_range(unsigned long, unsigned long);
59extern void __flush_invalidate_dcache_page(unsigned long);
60extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
61#else
62# define __flush_dcache_range(p,s) do { } while(0)
63# define __flush_dcache_page(p) do { } while(0)
64# define __flush_invalidate_dcache_page(p) __invalidate_dcache_page(p)
65# define __flush_invalidate_dcache_range(p,s) __invalidate_dcache_range(p,s)
66#endif
67
68#if (DCACHE_WAY_SIZE > PAGE_SIZE)
69extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long);
70#endif
71#if (ICACHE_WAY_SIZE > PAGE_SIZE)
72extern void __invalidate_icache_page_alias(unsigned long, unsigned long);
73#else
74# define __invalidate_icache_page_alias(v,p) do { } while(0)
75#endif
76
77/*
78 * We have physically tagged caches - nothing to do here -
79 * unless we have cache aliasing.
80 *
81 * Pages can get remapped. Because this might change the 'color' of that page,
82 * we have to flush the cache before the PTE is changed.
83 * (see also Documentation/cachetlb.txt)
84 */
85
86#if (DCACHE_WAY_SIZE > PAGE_SIZE)
87
88#define flush_cache_all() \
89 do { \
90 __flush_invalidate_dcache_all(); \
91 __invalidate_icache_all(); \
92 } while (0)
93
94#define flush_cache_mm(mm) flush_cache_all()
95#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
96
97#define flush_cache_vmap(start,end) flush_cache_all()
98#define flush_cache_vunmap(start,end) flush_cache_all()
99
100extern void flush_dcache_page(struct page*);
101extern void flush_cache_range(struct vm_area_struct*, ulong, ulong);
102extern void flush_cache_page(struct vm_area_struct*, unsigned long, unsigned long);
103
104#else
105
106#define flush_cache_all() do { } while (0)
107#define flush_cache_mm(mm) do { } while (0)
108#define flush_cache_dup_mm(mm) do { } while (0)
109
110#define flush_cache_vmap(start,end) do { } while (0)
111#define flush_cache_vunmap(start,end) do { } while (0)
112
113#define flush_dcache_page(page) do { } while (0)
114
115#define flush_cache_page(vma,addr,pfn) do { } while (0)
116#define flush_cache_range(vma,start,end) do { } while (0)
117
118#endif
119
120/* Ensure consistency between data and instruction cache. */
121#define flush_icache_range(start,end) \
122 do { \
123 __flush_dcache_range(start, (end) - (start)); \
124 __invalidate_icache_range(start,(end) - (start)); \
125 } while (0)
126
127/* This is not required, see Documentation/cachetlb.txt */
128#define flush_icache_page(vma,page) do { } while (0)
129
130#define flush_dcache_mmap_lock(mapping) do { } while (0)
131#define flush_dcache_mmap_unlock(mapping) do { } while (0)
132
133#if (DCACHE_WAY_SIZE > PAGE_SIZE)
134
135extern void copy_to_user_page(struct vm_area_struct*, struct page*,
136 unsigned long, void*, const void*, unsigned long);
137extern void copy_from_user_page(struct vm_area_struct*, struct page*,
138 unsigned long, void*, const void*, unsigned long);
139
140#else
141
142#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
143 do { \
144 memcpy(dst, src, len); \
145 __flush_dcache_range((unsigned long) dst, len); \
146 __invalidate_icache_range((unsigned long) dst, len); \
147 } while (0)
148
149#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
150 memcpy(dst, src, len)
151
152#endif
153
154#endif /* __KERNEL__ */
155#endif /* _XTENSA_CACHEFLUSH_H */