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_dup_mm(mm)			do {} while(0)
24#define flush_cache_range(mm, start, end)	do {} while(0)
25#define flush_cache_page(vma, vmaddr, pfn)	do {} while(0)
26#define flush_cache_vmap(start, end)		do {} while(0)
27#define flush_cache_vunmap(start, end)		do {} while(0)
28#define flush_dcache_mmap_lock(mapping)		do {} while(0)
29#define flush_dcache_mmap_unlock(mapping)	do {} while(0)
30
31/*
32 * physically-indexed cache managment
33 * - see arch/frv/lib/cache.S
34 */
35extern void frv_dcache_writeback(unsigned long start, unsigned long size);
36extern void frv_cache_invalidate(unsigned long start, unsigned long size);
37extern void frv_icache_invalidate(unsigned long start, unsigned long size);
38extern void frv_cache_wback_inv(unsigned long start, unsigned long size);
39
40static inline void __flush_cache_all(void)
41{
42	asm volatile("	dcef	@(gr0,gr0),#1	\n"
43		     "	icei	@(gr0,gr0),#1	\n"
44		     "	membar			\n"
45		     : : : "memory"
46		     );
47}
48
49/* dcache/icache coherency... */
50#ifdef CONFIG_MMU
51extern void flush_dcache_page(struct page *page);
52#else
53static inline void flush_dcache_page(struct page *page)
54{
55	unsigned long addr = page_to_phys(page);
56	frv_dcache_writeback(addr, addr + PAGE_SIZE);
57}
58#endif
59
60static inline void flush_page_to_ram(struct page *page)
61{
62	flush_dcache_page(page);
63}
64
65static inline void flush_icache(void)
66{
67	__flush_cache_all();
68}
69
70static inline void flush_icache_range(unsigned long start, unsigned long end)
71{
72	frv_cache_wback_inv(start, end);
73}
74
75#ifdef CONFIG_MMU
76extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
77				    unsigned long start, unsigned long len);
78#else
79static inline void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
80					   unsigned long start, unsigned long len)
81{
82	frv_cache_wback_inv(start, start + len);
83}
84#endif
85
86static inline void flush_icache_page(struct vm_area_struct *vma, struct page *page)
87{
88	flush_icache_user_range(vma, page, page_to_phys(page), PAGE_SIZE);
89}
90
91/*
92 * permit ptrace to access another process's address space through the icache
93 * and the dcache
94 */
95#define copy_to_user_page(vma, page, vaddr, dst, src, len)	\
96do {								\
97	memcpy((dst), (src), (len));				\
98	flush_icache_user_range((vma), (page), (vaddr), (len));	\
99} while(0)
100
101#define copy_from_user_page(vma, page, vaddr, dst, src, len)	\
102	memcpy((dst), (src), (len))
103
104#endif /* _ASM_CACHEFLUSH_H */
105