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Linux/arch/mips/include/asm/cacheflush.h

  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  */
 32 extern void (*flush_cache_all)(void);
 33 extern void (*__flush_cache_all)(void);
 34 extern void (*flush_cache_mm)(struct mm_struct *mm);
 35 #define flush_cache_dup_mm(mm)  do { (void) (mm); } while (0)
 36 extern void (*flush_cache_range)(struct vm_area_struct *vma,
 37         unsigned long start, unsigned long end);
 38 extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
 39 extern void __flush_dcache_page(struct page *page);
 40 
 41 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
 42 static 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
 53 extern void __flush_anon_page(struct page *, unsigned long);
 54 static 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 
 61 static inline void flush_icache_page(struct vm_area_struct *vma,
 62         struct page *page)
 63 {
 64 }
 65 
 66 extern void (*flush_icache_range)(unsigned long start, unsigned long end);
 67 extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
 68 
 69 extern void (*__flush_cache_vmap)(void);
 70 
 71 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
 72 {
 73         if (cpu_has_dc_aliases)
 74                 __flush_cache_vmap();
 75 }
 76 
 77 extern void (*__flush_cache_vunmap)(void);
 78 
 79 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
 80 {
 81         if (cpu_has_dc_aliases)
 82                 __flush_cache_vunmap();
 83 }
 84 
 85 extern 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 
 89 extern 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 
 93 extern void (*flush_cache_sigtramp)(unsigned long addr);
 94 extern void (*flush_icache_all)(void);
 95 extern void (*local_flush_data_cache_page)(void * addr);
 96 extern 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. */
112 unsigned long run_uncached(void *func);
113 
114 extern void *kmap_coherent(struct page *page, unsigned long addr);
115 extern void kunmap_coherent(void);
116 extern void *kmap_noncoherent(struct page *page, unsigned long addr);
117 
118 static inline void kunmap_noncoherent(void)
119 {
120         kunmap_coherent();
121 }
122 
123 #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
124 static inline void flush_kernel_dcache_page(struct page *page)
125 {
126         BUG_ON(cpu_has_dc_aliases && PageHighMem(page));
127 }
128 
129 /*
130  * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
131  * cache writeback and invalidate operation.
132  */
133 extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
134 
135 static inline void flush_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 static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
142 {
143         if (cpu_has_dc_aliases)
144                 __flush_kernel_vmap_range((unsigned long) vaddr, size);
145 }
146 
147 #endif /* _ASM_CACHEFLUSH_H */
148 

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