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) 2009, Wind River Systems Inc 7 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com 8 */ 9 10 #include <linux/export.h> 11 #include <linux/sched.h> 12 #include <linux/mm.h> 13 #include <linux/fs.h> 14 15 #include <asm/cacheflush.h> 16 #include <asm/cpuinfo.h> 17 18 static void __flush_dcache(unsigned long start, unsigned long end) 19 { 20 unsigned long addr; 21 22 start &= ~(cpuinfo.dcache_line_size - 1); 23 end += (cpuinfo.dcache_line_size - 1); 24 end &= ~(cpuinfo.dcache_line_size - 1); 25 26 if (end > start + cpuinfo.dcache_size) 27 end = start + cpuinfo.dcache_size; 28 29 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) { 30 __asm__ __volatile__ (" flushda 0(%0)\n" 31 : /* Outputs */ 32 : /* Inputs */ "r"(addr) 33 /* : No clobber */); 34 } 35 } 36 37 static void __flush_dcache_all(unsigned long start, unsigned long end) 38 { 39 unsigned long addr; 40 41 start &= ~(cpuinfo.dcache_line_size - 1); 42 end += (cpuinfo.dcache_line_size - 1); 43 end &= ~(cpuinfo.dcache_line_size - 1); 44 45 if (end > start + cpuinfo.dcache_size) 46 end = start + cpuinfo.dcache_size; 47 48 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) { 49 __asm__ __volatile__ (" flushd 0(%0)\n" 50 : /* Outputs */ 51 : /* Inputs */ "r"(addr) 52 /* : No clobber */); 53 } 54 } 55 56 static void __invalidate_dcache(unsigned long start, unsigned long end) 57 { 58 unsigned long addr; 59 60 start &= ~(cpuinfo.dcache_line_size - 1); 61 end += (cpuinfo.dcache_line_size - 1); 62 end &= ~(cpuinfo.dcache_line_size - 1); 63 64 if (end > start + cpuinfo.dcache_size) 65 end = start + cpuinfo.dcache_size; 66 67 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) { 68 __asm__ __volatile__ (" initda 0(%0)\n" 69 : /* Outputs */ 70 : /* Inputs */ "r"(addr) 71 /* : No clobber */); 72 } 73 } 74 75 static void __flush_icache(unsigned long start, unsigned long end) 76 { 77 unsigned long addr; 78 79 start &= ~(cpuinfo.icache_line_size - 1); 80 end += (cpuinfo.icache_line_size - 1); 81 end &= ~(cpuinfo.icache_line_size - 1); 82 83 if (end > start + cpuinfo.icache_size) 84 end = start + cpuinfo.icache_size; 85 86 for (addr = start; addr < end; addr += cpuinfo.icache_line_size) { 87 __asm__ __volatile__ (" flushi %0\n" 88 : /* Outputs */ 89 : /* Inputs */ "r"(addr) 90 /* : No clobber */); 91 } 92 __asm__ __volatile(" flushp\n"); 93 } 94 95 static void flush_aliases(struct address_space *mapping, struct page *page) 96 { 97 struct mm_struct *mm = current->active_mm; 98 struct vm_area_struct *mpnt; 99 pgoff_t pgoff; 100 101 pgoff = page->index; 102 103 flush_dcache_mmap_lock(mapping); 104 vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) { 105 unsigned long offset; 106 107 if (mpnt->vm_mm != mm) 108 continue; 109 if (!(mpnt->vm_flags & VM_MAYSHARE)) 110 continue; 111 112 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; 113 flush_cache_page(mpnt, mpnt->vm_start + offset, 114 page_to_pfn(page)); 115 } 116 flush_dcache_mmap_unlock(mapping); 117 } 118 119 void flush_cache_all(void) 120 { 121 __flush_dcache_all(0, cpuinfo.dcache_size); 122 __flush_icache(0, cpuinfo.icache_size); 123 } 124 125 void flush_cache_mm(struct mm_struct *mm) 126 { 127 flush_cache_all(); 128 } 129 130 void flush_cache_dup_mm(struct mm_struct *mm) 131 { 132 flush_cache_all(); 133 } 134 135 void flush_icache_range(unsigned long start, unsigned long end) 136 { 137 __flush_icache(start, end); 138 } 139 140 void flush_dcache_range(unsigned long start, unsigned long end) 141 { 142 __flush_dcache(start, end); 143 } 144 EXPORT_SYMBOL(flush_dcache_range); 145 146 void invalidate_dcache_range(unsigned long start, unsigned long end) 147 { 148 __invalidate_dcache(start, end); 149 } 150 EXPORT_SYMBOL(invalidate_dcache_range); 151 152 void flush_cache_range(struct vm_area_struct *vma, unsigned long start, 153 unsigned long end) 154 { 155 __flush_dcache(start, end); 156 if (vma == NULL || (vma->vm_flags & VM_EXEC)) 157 __flush_icache(start, end); 158 } 159 160 void flush_icache_page(struct vm_area_struct *vma, struct page *page) 161 { 162 unsigned long start = (unsigned long) page_address(page); 163 unsigned long end = start + PAGE_SIZE; 164 165 __flush_icache(start, end); 166 } 167 168 void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, 169 unsigned long pfn) 170 { 171 unsigned long start = vmaddr; 172 unsigned long end = start + PAGE_SIZE; 173 174 __flush_dcache(start, end); 175 if (vma->vm_flags & VM_EXEC) 176 __flush_icache(start, end); 177 } 178 179 void flush_dcache_page(struct page *page) 180 { 181 struct address_space *mapping; 182 183 /* 184 * The zero page is never written to, so never has any dirty 185 * cache lines, and therefore never needs to be flushed. 186 */ 187 if (page == ZERO_PAGE(0)) 188 return; 189 190 mapping = page_mapping(page); 191 192 /* Flush this page if there are aliases. */ 193 if (mapping && !mapping_mapped(mapping)) { 194 clear_bit(PG_dcache_clean, &page->flags); 195 } else { 196 unsigned long start = (unsigned long)page_address(page); 197 198 __flush_dcache_all(start, start + PAGE_SIZE); 199 if (mapping) 200 flush_aliases(mapping, page); 201 set_bit(PG_dcache_clean, &page->flags); 202 } 203 } 204 EXPORT_SYMBOL(flush_dcache_page); 205 206 void update_mmu_cache(struct vm_area_struct *vma, 207 unsigned long address, pte_t *pte) 208 { 209 unsigned long pfn = pte_pfn(*pte); 210 struct page *page; 211 212 if (!pfn_valid(pfn)) 213 return; 214 215 /* 216 * The zero page is never written to, so never has any dirty 217 * cache lines, and therefore never needs to be flushed. 218 */ 219 page = pfn_to_page(pfn); 220 if (page == ZERO_PAGE(0)) 221 return; 222 223 if (!PageReserved(page) && 224 !test_and_set_bit(PG_dcache_clean, &page->flags)) { 225 unsigned long start = page_to_virt(page); 226 struct address_space *mapping; 227 228 __flush_dcache(start, start + PAGE_SIZE); 229 230 mapping = page_mapping(page); 231 if (mapping) 232 flush_aliases(mapping, page); 233 } 234 } 235 236 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 237 struct page *to) 238 { 239 __flush_dcache(vaddr, vaddr + PAGE_SIZE); 240 copy_page(vto, vfrom); 241 __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE); 242 } 243 244 void clear_user_page(void *addr, unsigned long vaddr, struct page *page) 245 { 246 __flush_dcache(vaddr, vaddr + PAGE_SIZE); 247 clear_page(addr); 248 __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE); 249 } 250 251 void copy_from_user_page(struct vm_area_struct *vma, struct page *page, 252 unsigned long user_vaddr, 253 void *dst, void *src, int len) 254 { 255 flush_cache_page(vma, user_vaddr, page_to_pfn(page)); 256 memcpy(dst, src, len); 257 __flush_dcache((unsigned long)src, (unsigned long)src + len); 258 if (vma->vm_flags & VM_EXEC) 259 __flush_icache((unsigned long)src, (unsigned long)src + len); 260 } 261 262 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 263 unsigned long user_vaddr, 264 void *dst, void *src, int len) 265 { 266 flush_cache_page(vma, user_vaddr, page_to_pfn(page)); 267 memcpy(dst, src, len); 268 __flush_dcache((unsigned long)dst, (unsigned long)dst + len); 269 if (vma->vm_flags & VM_EXEC) 270 __flush_icache((unsigned long)dst, (unsigned long)dst + len); 271 } 272