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_cache_sigtramp() flush signal trampoline
 29 *  - flush_icache_all() flush the entire instruction cache
 30 *  - flush_data_cache_page() flushes a page from the data cache
 31 */
 32extern void (*flush_cache_all)(void);
 33extern void (*__flush_cache_all)(void);
 34extern void (*flush_cache_mm)(struct mm_struct *mm);
 35#define flush_cache_dup_mm(mm)	do { (void) (mm); } while (0)
 36extern void (*flush_cache_range)(struct vm_area_struct *vma,
 37	unsigned long start, unsigned long end);
 38extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
 39extern void __flush_dcache_page(struct page *page);
 40
 41#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
 42static inline void flush_dcache_page(struct page *page)
 43{
 44	if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
 45		__flush_dcache_page(page);
 46
 47}
 48
 49#define flush_dcache_mmap_lock(mapping)		do { } while (0)
 50#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
 51
 52#define ARCH_HAS_FLUSH_ANON_PAGE
 53extern void __flush_anon_page(struct page *, unsigned long);
 54static inline void flush_anon_page(struct vm_area_struct *vma,
 55	struct page *page, unsigned long vmaddr)
 56{
 57	if (cpu_has_dc_aliases && PageAnon(page))
 58		__flush_anon_page(page, vmaddr);
 59}
 60
 61static inline void flush_icache_page(struct vm_area_struct *vma,
 62	struct page *page)
 63{
 64}
 65
 66extern void (*flush_icache_range)(unsigned long start, unsigned long end);
 67extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
 68
 69extern void (*__flush_cache_vmap)(void);
 70
 71static inline void flush_cache_vmap(unsigned long start, unsigned long end)
 72{
 73	if (cpu_has_dc_aliases)
 74		__flush_cache_vmap();
 75}
 76
 77extern void (*__flush_cache_vunmap)(void);
 78
 79static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
 80{
 81	if (cpu_has_dc_aliases)
 82		__flush_cache_vunmap();
 83}
 84
 85extern void copy_to_user_page(struct vm_area_struct *vma,
 86	struct page *page, unsigned long vaddr, void *dst, const void *src,
 87	unsigned long len);
 88
 89extern void copy_from_user_page(struct vm_area_struct *vma,
 90	struct page *page, unsigned long vaddr, void *dst, const void *src,
 91	unsigned long len);
 92
 93extern void (*flush_cache_sigtramp)(unsigned long addr);
 94extern void (*flush_icache_all)(void);
 95extern void (*local_flush_data_cache_page)(void * addr);
 96extern void (*flush_data_cache_page)(unsigned long addr);
 97
 98/*
 99 * This flag is used to indicate that the page pointed to by a pte
100 * is dirty and requires cleaning before returning it to the user.
101 */
102#define PG_dcache_dirty			PG_arch_1
103
104#define Page_dcache_dirty(page)		\
105	test_bit(PG_dcache_dirty, &(page)->flags)
106#define SetPageDcacheDirty(page)	\
107	set_bit(PG_dcache_dirty, &(page)->flags)
108#define ClearPageDcacheDirty(page)	\
109	clear_bit(PG_dcache_dirty, &(page)->flags)
110
111/* Run kernel code uncached, useful for cache probing functions. */
112unsigned long run_uncached(void *func);
113
114extern void *kmap_coherent(struct page *page, unsigned long addr);
115extern void kunmap_coherent(void);
116
117#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
118static inline void flush_kernel_dcache_page(struct page *page)
119{
120	BUG_ON(cpu_has_dc_aliases && PageHighMem(page));
121}
122
123/*
124 * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
125 * cache writeback and invalidate operation.
126 */
127extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
128
129static inline void flush_kernel_vmap_range(void *vaddr, int size)
130{
131	if (cpu_has_dc_aliases)
132		__flush_kernel_vmap_range((unsigned long) vaddr, size);
133}
134
135static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
136{
137	if (cpu_has_dc_aliases)
138		__flush_kernel_vmap_range((unsigned long) vaddr, size);
139}
140
141#endif /* _ASM_CACHEFLUSH_H */