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1/* cacheflush.h: FRV cache flushing routines
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _ASM_CACHEFLUSH_H
13#define _ASM_CACHEFLUSH_H
14
15/* Keep includes the same across arches. */
16#include <linux/mm.h>
17
18/*
19 * virtually-indexed cache management (our cache is physically indexed)
20 */
21#define flush_cache_all() do {} while(0)
22#define flush_cache_mm(mm) do {} while(0)
23#define flush_cache_range(mm, start, end) do {} while(0)
24#define flush_cache_page(vma, vmaddr, pfn) do {} while(0)
25#define flush_cache_vmap(start, end) do {} while(0)
26#define flush_cache_vunmap(start, end) do {} while(0)
27#define flush_dcache_mmap_lock(mapping) do {} while(0)
28#define flush_dcache_mmap_unlock(mapping) do {} while(0)
29
30/*
31 * physically-indexed cache managment
32 * - see arch/frv/lib/cache.S
33 */
34extern void frv_dcache_writeback(unsigned long start, unsigned long size);
35extern void frv_cache_invalidate(unsigned long start, unsigned long size);
36extern void frv_icache_invalidate(unsigned long start, unsigned long size);
37extern void frv_cache_wback_inv(unsigned long start, unsigned long size);
38
39static inline void __flush_cache_all(void)
40{
41 asm volatile(" dcef @(gr0,gr0),#1 \n"
42 " icei @(gr0,gr0),#1 \n"
43 " membar \n"
44 : : : "memory"
45 );
46}
47
48/* dcache/icache coherency... */
49#ifdef CONFIG_MMU
50extern void flush_dcache_page(struct page *page);
51#else
52static inline void flush_dcache_page(struct page *page)
53{
54 unsigned long addr = page_to_phys(page);
55 frv_dcache_writeback(addr, addr + PAGE_SIZE);
56}
57#endif
58
59static inline void flush_page_to_ram(struct page *page)
60{
61 flush_dcache_page(page);
62}
63
64static inline void flush_icache(void)
65{
66 __flush_cache_all();
67}
68
69static inline void flush_icache_range(unsigned long start, unsigned long end)
70{
71 frv_cache_wback_inv(start, end);
72}
73
74#ifdef CONFIG_MMU
75extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
76 unsigned long start, unsigned long len);
77#else
78static inline void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
79 unsigned long start, unsigned long len)
80{
81 frv_cache_wback_inv(start, start + len);
82}
83#endif
84
85static inline void flush_icache_page(struct vm_area_struct *vma, struct page *page)
86{
87 flush_icache_user_range(vma, page, page_to_phys(page), PAGE_SIZE);
88}
89
90/*
91 * permit ptrace to access another process's address space through the icache
92 * and the dcache
93 */
94#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
95do { \
96 memcpy((dst), (src), (len)); \
97 flush_icache_user_range((vma), (page), (vaddr), (len)); \
98} while(0)
99
100#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
101 memcpy((dst), (src), (len))
102
103#endif /* _ASM_CACHEFLUSH_H */