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