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