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 #include <linux/pagemap.h> 15 16 #include <asm/cacheflush.h> 17 #include <asm/cpuinfo.h> 18 19 static void __flush_dcache(unsigned long start, unsigned long end) 20 { 21 unsigned long addr; 22 23 start &= ~(cpuinfo.dcache_line_size - 1); 24 end += (cpuinfo.dcache_line_size - 1); 25 end &= ~(cpuinfo.dcache_line_size - 1); 26 27 if (end > start + cpuinfo.dcache_size) 28 end = start + cpuinfo.dcache_size; 29 30 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) { 31 __asm__ __volatile__ (" flushd 0(%0)\n" 32 : /* Outputs */ 33 : /* Inputs */ "r"(addr) 34 /* : No clobber */); 35 } 36 } 37 38 static void __invalidate_dcache(unsigned long start, unsigned long end) 39 { 40 unsigned long addr; 41 42 start &= ~(cpuinfo.dcache_line_size - 1); 43 end += (cpuinfo.dcache_line_size - 1); 44 end &= ~(cpuinfo.dcache_line_size - 1); 45 46 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) { 47 __asm__ __volatile__ (" initda 0(%0)\n" 48 : /* Outputs */ 49 : /* Inputs */ "r"(addr) 50 /* : No clobber */); 51 } 52 } 53 54 static void __flush_icache(unsigned long start, unsigned long end) 55 { 56 unsigned long addr; 57 58 start &= ~(cpuinfo.icache_line_size - 1); 59 end += (cpuinfo.icache_line_size - 1); 60 end &= ~(cpuinfo.icache_line_size - 1); 61 62 if (end > start + cpuinfo.icache_size) 63 end = start + cpuinfo.icache_size; 64 65 for (addr = start; addr < end; addr += cpuinfo.icache_line_size) { 66 __asm__ __volatile__ (" flushi %0\n" 67 : /* Outputs */ 68 : /* Inputs */ "r"(addr) 69 /* : No clobber */); 70 } 71 __asm__ __volatile(" flushp\n"); 72 } 73 74 static void flush_aliases(struct address_space *mapping, struct page *page) 75 { 76 struct mm_struct *mm = current->active_mm; 77 struct vm_area_struct *mpnt; 78 pgoff_t pgoff; 79 80 pgoff = page->index; 81 82 flush_dcache_mmap_lock(mapping); 83 vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) { 84 unsigned long offset; 85 86 if (mpnt->vm_mm != mm) 87 continue; 88 if (!(mpnt->vm_flags & VM_MAYSHARE)) 89 continue; 90 91 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; 92 flush_cache_page(mpnt, mpnt->vm_start + offset, 93 page_to_pfn(page)); 94 } 95 flush_dcache_mmap_unlock(mapping); 96 } 97 98 void flush_cache_all(void) 99 { 100 __flush_dcache(0, cpuinfo.dcache_size); 101 __flush_icache(0, cpuinfo.icache_size); 102 } 103 104 void flush_cache_mm(struct mm_struct *mm) 105 { 106 flush_cache_all(); 107 } 108 109 void flush_cache_dup_mm(struct mm_struct *mm) 110 { 111 flush_cache_all(); 112 } 113 114 void flush_icache_range(unsigned long start, unsigned long end) 115 { 116 __flush_dcache(start, end); 117 __flush_icache(start, end); 118 } 119 120 void flush_dcache_range(unsigned long start, unsigned long end) 121 { 122 __flush_dcache(start, end); 123 __flush_icache(start, end); 124 } 125 EXPORT_SYMBOL(flush_dcache_range); 126 127 void invalidate_dcache_range(unsigned long start, unsigned long end) 128 { 129 __invalidate_dcache(start, end); 130 } 131 EXPORT_SYMBOL(invalidate_dcache_range); 132 133 void flush_cache_range(struct vm_area_struct *vma, unsigned long start, 134 unsigned long end) 135 { 136 __flush_dcache(start, end); 137 if (vma == NULL || (vma->vm_flags & VM_EXEC)) 138 __flush_icache(start, end); 139 } 140 141 void flush_icache_page(struct vm_area_struct *vma, struct page *page) 142 { 143 unsigned long start = (unsigned long) page_address(page); 144 unsigned long end = start + PAGE_SIZE; 145 146 __flush_dcache(start, end); 147 __flush_icache(start, end); 148 } 149 150 void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, 151 unsigned long pfn) 152 { 153 unsigned long start = vmaddr; 154 unsigned long end = start + PAGE_SIZE; 155 156 __flush_dcache(start, end); 157 if (vma->vm_flags & VM_EXEC) 158 __flush_icache(start, end); 159 } 160 161 void __flush_dcache_page(struct address_space *mapping, struct page *page) 162 { 163 /* 164 * Writeback any data associated with the kernel mapping of this 165 * page. This ensures that data in the physical page is mutually 166 * coherent with the kernels mapping. 167 */ 168 unsigned long start = (unsigned long)page_address(page); 169 170 __flush_dcache(start, start + PAGE_SIZE); 171 } 172 173 void flush_dcache_page(struct page *page) 174 { 175 struct address_space *mapping; 176 177 /* 178 * The zero page is never written to, so never has any dirty 179 * cache lines, and therefore never needs to be flushed. 180 */ 181 if (page == ZERO_PAGE(0)) 182 return; 183 184 mapping = page_mapping_file(page); 185 186 /* Flush this page if there are aliases. */ 187 if (mapping && !mapping_mapped(mapping)) { 188 clear_bit(PG_dcache_clean, &page->flags); 189 } else { 190 __flush_dcache_page(mapping, page); 191 if (mapping) { 192 unsigned long start = (unsigned long)page_address(page); 193 flush_aliases(mapping, page); 194 flush_icache_range(start, start + PAGE_SIZE); 195 } 196 set_bit(PG_dcache_clean, &page->flags); 197 } 198 } 199 EXPORT_SYMBOL(flush_dcache_page); 200 201 void update_mmu_cache(struct vm_area_struct *vma, 202 unsigned long address, pte_t *ptep) 203 { 204 pte_t pte = *ptep; 205 unsigned long pfn = pte_pfn(pte); 206 struct page *page; 207 struct address_space *mapping; 208 209 reload_tlb_page(vma, address, pte); 210 211 if (!pfn_valid(pfn)) 212 return; 213 214 /* 215 * The zero page is never written to, so never has any dirty 216 * cache lines, and therefore never needs to be flushed. 217 */ 218 page = pfn_to_page(pfn); 219 if (page == ZERO_PAGE(0)) 220 return; 221 222 mapping = page_mapping_file(page); 223 if (!test_and_set_bit(PG_dcache_clean, &page->flags)) 224 __flush_dcache_page(mapping, page); 225 226 if(mapping) 227 { 228 flush_aliases(mapping, page); 229 if (vma->vm_flags & VM_EXEC) 230 flush_icache_page(vma, page); 231 } 232 } 233 234 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 235 struct page *to) 236 { 237 __flush_dcache(vaddr, vaddr + PAGE_SIZE); 238 __flush_icache(vaddr, vaddr + PAGE_SIZE); 239 copy_page(vto, vfrom); 240 __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE); 241 __flush_icache((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 __flush_icache(vaddr, vaddr + PAGE_SIZE); 248 clear_page(addr); 249 __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE); 250 __flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE); 251 } 252 253 void copy_from_user_page(struct vm_area_struct *vma, struct page *page, 254 unsigned long user_vaddr, 255 void *dst, void *src, int len) 256 { 257 flush_cache_page(vma, user_vaddr, page_to_pfn(page)); 258 memcpy(dst, src, len); 259 __flush_dcache((unsigned long)src, (unsigned long)src + len); 260 if (vma->vm_flags & VM_EXEC) 261 __flush_icache((unsigned long)src, (unsigned long)src + len); 262 } 263 264 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 265 unsigned long user_vaddr, 266 void *dst, void *src, int len) 267 { 268 flush_cache_page(vma, user_vaddr, page_to_pfn(page)); 269 memcpy(dst, src, len); 270 __flush_dcache((unsigned long)dst, (unsigned long)dst + len); 271 if (vma->vm_flags & VM_EXEC) 272 __flush_icache((unsigned long)dst, (unsigned long)dst + len); 273 } 274