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 management
 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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
 51#ifdef CONFIG_MMU
 52extern void flush_dcache_page(struct page *page);
 53#else
 54static inline void flush_dcache_page(struct page *page)
 55{
 56	unsigned long addr = page_to_phys(page);
 57	frv_dcache_writeback(addr, addr + PAGE_SIZE);
 58}
 59#endif
 60
 61static inline void flush_page_to_ram(struct page *page)
 62{
 63	flush_dcache_page(page);
 64}
 65
 66static inline void flush_icache(void)
 67{
 68	__flush_cache_all();
 69}
 70
 71static inline void flush_icache_range(unsigned long start, unsigned long end)
 72{
 73	frv_cache_wback_inv(start, end);
 74}
 75
 76#ifdef CONFIG_MMU
 77extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
 78				    unsigned long start, unsigned long len);
 79#else
 80static inline void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
 81					   unsigned long start, unsigned long len)
 82{
 83	frv_cache_wback_inv(start, start + len);
 84}
 85#endif
 86
 87static inline void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 88{
 89	flush_icache_user_range(vma, page, page_to_phys(page), PAGE_SIZE);
 90}
 91
 92/*
 93 * permit ptrace to access another process's address space through the icache
 94 * and the dcache
 95 */
 96#define copy_to_user_page(vma, page, vaddr, dst, src, len)	\
 97do {								\
 98	memcpy((dst), (src), (len));				\
 99	flush_icache_user_range((vma), (page), (vaddr), (len));	\
100} while(0)
101
102#define copy_from_user_page(vma, page, vaddr, dst, src, len)	\
103	memcpy((dst), (src), (len))
104
105#endif /* _ASM_CACHEFLUSH_H */