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_icache_all() flush the entire instruction cache 29 * - flush_data_cache_page() flushes a page from the data cache 30 * - __flush_icache_user_range(start, end) flushes range of user instructions 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 folio_test_dcache_dirty(folio) \ 40 test_bit(PG_dcache_dirty, &(folio)->flags) 41 #define folio_set_dcache_dirty(folio) \ 42 set_bit(PG_dcache_dirty, &(folio)->flags) 43 #define folio_clear_dcache_dirty(folio) \ 44 clear_bit(PG_dcache_dirty, &(folio)->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_pages(struct page *page, unsigned int nr); 54 55 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 56 static inline void flush_dcache_folio(struct folio *folio) 57 { 58 if (cpu_has_dc_aliases) 59 __flush_dcache_pages(&folio->page, folio_nr_pages(folio)); 60 else if (!cpu_has_ic_fills_f_dc) 61 folio_set_dcache_dirty(folio); 62 } 63 #define flush_dcache_folio flush_dcache_folio 64 65 static inline void flush_dcache_page(struct page *page) 66 { 67 if (cpu_has_dc_aliases) 68 __flush_dcache_pages(page, 1); 69 else if (!cpu_has_ic_fills_f_dc) 70 folio_set_dcache_dirty(page_folio(page)); 71 } 72 73 #define flush_dcache_mmap_lock(mapping) do { } while (0) 74 #define flush_dcache_mmap_unlock(mapping) do { } while (0) 75 76 #define ARCH_HAS_FLUSH_ANON_PAGE 77 extern void __flush_anon_page(struct page *, unsigned long); 78 static inline void flush_anon_page(struct vm_area_struct *vma, 79 struct page *page, unsigned long vmaddr) 80 { 81 if (cpu_has_dc_aliases && PageAnon(page)) 82 __flush_anon_page(page, vmaddr); 83 } 84 85 extern void (*flush_icache_range)(unsigned long start, unsigned long end); 86 extern void (*local_flush_icache_range)(unsigned long start, unsigned long end); 87 extern void (*__flush_icache_user_range)(unsigned long start, 88 unsigned long end); 89 extern void (*__local_flush_icache_user_range)(unsigned long start, 90 unsigned long end); 91 92 extern void (*__flush_cache_vmap)(void); 93 94 static inline void flush_cache_vmap(unsigned long start, unsigned long end) 95 { 96 if (cpu_has_dc_aliases) 97 __flush_cache_vmap(); 98 } 99 100 #define flush_cache_vmap_early(start, end) do { } while (0) 101 102 extern void (*__flush_cache_vunmap)(void); 103 104 static inline void flush_cache_vunmap(unsigned long start, unsigned long end) 105 { 106 if (cpu_has_dc_aliases) 107 __flush_cache_vunmap(); 108 } 109 110 extern void copy_to_user_page(struct vm_area_struct *vma, 111 struct page *page, unsigned long vaddr, void *dst, const void *src, 112 unsigned long len); 113 114 extern void copy_from_user_page(struct vm_area_struct *vma, 115 struct page *page, unsigned long vaddr, void *dst, const void *src, 116 unsigned long len); 117 118 extern void (*flush_icache_all)(void); 119 extern void (*flush_data_cache_page)(unsigned long addr); 120 121 /* Run kernel code uncached, useful for cache probing functions. */ 122 unsigned long run_uncached(void *func); 123 124 extern void *kmap_coherent(struct page *page, unsigned long addr); 125 extern void kunmap_coherent(void); 126 extern void *kmap_noncoherent(struct page *page, unsigned long addr); 127 128 static inline void kunmap_noncoherent(void) 129 { 130 kunmap_coherent(); 131 } 132 133 #define ARCH_IMPLEMENTS_FLUSH_KERNEL_VMAP_RANGE 1 134 /* 135 * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a 136 * cache writeback and invalidate operation. 137 */ 138 extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); 139 140 static inline void flush_kernel_vmap_range(void *vaddr, int size) 141 { 142 if (cpu_has_dc_aliases) 143 __flush_kernel_vmap_range((unsigned long) vaddr, size); 144 } 145 146 static inline void invalidate_kernel_vmap_range(void *vaddr, int size) 147 { 148 if (cpu_has_dc_aliases) 149 __flush_kernel_vmap_range((unsigned long) vaddr, size); 150 } 151 152 #endif /* _ASM_CACHEFLUSH_H */ 153