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 * - __flush_icache_user_range(start, end) flushes range of user instructions 32 */ 33 34 /* 35 * This flag is used to indicate that the page pointed to by a pte 36 * is dirty and requires cleaning before returning it to the user. 37 */ 38 #define PG_dcache_dirty PG_arch_1 39 40 #define Page_dcache_dirty(page) \ 41 test_bit(PG_dcache_dirty, &(page)->flags) 42 #define SetPageDcacheDirty(page) \ 43 set_bit(PG_dcache_dirty, &(page)->flags) 44 #define ClearPageDcacheDirty(page) \ 45 clear_bit(PG_dcache_dirty, &(page)->flags) 46 47 extern void (*flush_cache_all)(void); 48 extern void (*__flush_cache_all)(void); 49 extern void (*flush_cache_mm)(struct mm_struct *mm); 50 #define flush_cache_dup_mm(mm) do { (void) (mm); } while (0) 51 extern void (*flush_cache_range)(struct vm_area_struct *vma, 52 unsigned long start, unsigned long end); 53 extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn); 54 extern void __flush_dcache_page(struct page *page); 55 56 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 57 static inline void flush_dcache_page(struct page *page) 58 { 59 if (cpu_has_dc_aliases) 60 __flush_dcache_page(page); 61 else if (!cpu_has_ic_fills_f_dc) 62 SetPageDcacheDirty(page); 63 } 64 65 #define flush_dcache_mmap_lock(mapping) do { } while (0) 66 #define flush_dcache_mmap_unlock(mapping) do { } while (0) 67 68 #define ARCH_HAS_FLUSH_ANON_PAGE 69 extern void __flush_anon_page(struct page *, unsigned long); 70 static inline void flush_anon_page(struct vm_area_struct *vma, 71 struct page *page, unsigned long vmaddr) 72 { 73 if (cpu_has_dc_aliases && PageAnon(page)) 74 __flush_anon_page(page, vmaddr); 75 } 76 77 static inline void flush_icache_page(struct vm_area_struct *vma, 78 struct page *page) 79 { 80 } 81 82 extern void (*flush_icache_range)(unsigned long start, unsigned long end); 83 extern void (*local_flush_icache_range)(unsigned long start, unsigned long end); 84 extern void (*__flush_icache_user_range)(unsigned long start, 85 unsigned long end); 86 extern void (*__local_flush_icache_user_range)(unsigned long start, 87 unsigned long end); 88 89 extern void (*__flush_cache_vmap)(void); 90 91 static inline void flush_cache_vmap(unsigned long start, unsigned long end) 92 { 93 if (cpu_has_dc_aliases) 94 __flush_cache_vmap(); 95 } 96 97 extern void (*__flush_cache_vunmap)(void); 98 99 static inline void flush_cache_vunmap(unsigned long start, unsigned long end) 100 { 101 if (cpu_has_dc_aliases) 102 __flush_cache_vunmap(); 103 } 104 105 extern void copy_to_user_page(struct vm_area_struct *vma, 106 struct page *page, unsigned long vaddr, void *dst, const void *src, 107 unsigned long len); 108 109 extern void copy_from_user_page(struct vm_area_struct *vma, 110 struct page *page, unsigned long vaddr, void *dst, const void *src, 111 unsigned long len); 112 113 extern void (*flush_cache_sigtramp)(unsigned long addr); 114 extern void (*flush_icache_all)(void); 115 extern void (*local_flush_data_cache_page)(void * addr); 116 extern void (*flush_data_cache_page)(unsigned long addr); 117 118 /* Run kernel code uncached, useful for cache probing functions. */ 119 unsigned long run_uncached(void *func); 120 121 extern void *kmap_coherent(struct page *page, unsigned long addr); 122 extern void kunmap_coherent(void); 123 extern void *kmap_noncoherent(struct page *page, unsigned long addr); 124 125 static inline void kunmap_noncoherent(void) 126 { 127 kunmap_coherent(); 128 } 129 130 #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE 131 static inline void flush_kernel_dcache_page(struct page *page) 132 { 133 BUG_ON(cpu_has_dc_aliases && PageHighMem(page)); 134 flush_dcache_page(page); 135 } 136 137 /* 138 * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a 139 * cache writeback and invalidate operation. 140 */ 141 extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); 142 143 static inline void flush_kernel_vmap_range(void *vaddr, int size) 144 { 145 if (cpu_has_dc_aliases) 146 __flush_kernel_vmap_range((unsigned long) vaddr, size); 147 } 148 149 static inline void invalidate_kernel_vmap_range(void *vaddr, int size) 150 { 151 if (cpu_has_dc_aliases) 152 __flush_kernel_vmap_range((unsigned long) vaddr, size); 153 } 154 155 #endif /* _ASM_CACHEFLUSH_H */ 156