arch/nios2/mm/cacheflush.c

   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         for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
  27                 __asm__ __volatile__ ("   flushda 0(%0)\n"
  28                                         : /* Outputs */
  29                                         : /* Inputs  */ "r"(addr)
  30                                         /* : No clobber */);
  31         }
  32 }
  33
  34 static void __flush_dcache_all(unsigned long start, unsigned long end)
  35 {
  36         unsigned long addr;
  37
  38         start &= ~(cpuinfo.dcache_line_size - 1);
  39         end += (cpuinfo.dcache_line_size - 1);
  40         end &= ~(cpuinfo.dcache_line_size - 1);
  41
  42         if (end > start + cpuinfo.dcache_size)
  43                 end = start + cpuinfo.dcache_size;
  44
  45         for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
  46                 __asm__ __volatile__ ("   flushd 0(%0)\n"
  47                                         : /* Outputs */
  48                                         : /* Inputs  */ "r"(addr)
  49                                         /* : No clobber */);
  50         }
  51 }
  52
  53 static void __invalidate_dcache(unsigned long start, unsigned long end)
  54 {
  55         unsigned long addr;
  56
  57         start &= ~(cpuinfo.dcache_line_size - 1);
  58         end += (cpuinfo.dcache_line_size - 1);
  59         end &= ~(cpuinfo.dcache_line_size - 1);
  60
  61         for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
  62                 __asm__ __volatile__ ("   initda 0(%0)\n"
  63                                         : /* Outputs */
  64                                         : /* Inputs  */ "r"(addr)
  65                                         /* : No clobber */);
  66         }
  67 }
  68
  69 static void __flush_icache(unsigned long start, unsigned long end)
  70 {
  71         unsigned long addr;
  72
  73         start &= ~(cpuinfo.icache_line_size - 1);
  74         end += (cpuinfo.icache_line_size - 1);
  75         end &= ~(cpuinfo.icache_line_size - 1);
  76
  77         if (end > start + cpuinfo.icache_size)
  78                 end = start + cpuinfo.icache_size;
  79
  80         for (addr = start; addr < end; addr += cpuinfo.icache_line_size) {
  81                 __asm__ __volatile__ ("   flushi %0\n"
  82                                         : /* Outputs */
  83                                         : /* Inputs  */ "r"(addr)
  84                                         /* : No clobber */);
  85         }
  86         __asm__ __volatile(" flushp\n");
  87 }
  88
  89 static void flush_aliases(struct address_space *mapping, struct page *page)
  90 {
  91         struct mm_struct *mm = current->active_mm;
  92         struct vm_area_struct *mpnt;
  93         pgoff_t pgoff;
  94
  95         pgoff = page->index;
  96
  97         flush_dcache_mmap_lock(mapping);
  98         vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
  99                 unsigned long offset;
 100
 101                 if (mpnt->vm_mm != mm)
 102                         continue;
 103                 if (!(mpnt->vm_flags & VM_MAYSHARE))
 104                         continue;
 105
 106                 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
 107                 flush_cache_page(mpnt, mpnt->vm_start + offset,
 108                         page_to_pfn(page));
 109         }
 110         flush_dcache_mmap_unlock(mapping);
 111 }
 112
 113 void flush_cache_all(void)
 114 {
 115         __flush_dcache_all(0, cpuinfo.dcache_size);
 116         __flush_icache(0, cpuinfo.icache_size);
 117 }
 118
 119 void flush_cache_mm(struct mm_struct *mm)
 120 {
 121         flush_cache_all();
 122 }
 123
 124 void flush_cache_dup_mm(struct mm_struct *mm)
 125 {
 126         flush_cache_all();
 127 }
 128
 129 void flush_icache_range(unsigned long start, unsigned long end)
 130 {
 131         __flush_dcache(start, end);
 132         __flush_icache(start, end);
 133 }
 134
 135 void flush_dcache_range(unsigned long start, unsigned long end)
 136 {
 137         __flush_dcache(start, end);
 138         __flush_icache(start, end);
 139 }
 140 EXPORT_SYMBOL(flush_dcache_range);
 141
 142 void invalidate_dcache_range(unsigned long start, unsigned long end)
 143 {
 144         __invalidate_dcache(start, end);
 145 }
 146 EXPORT_SYMBOL(invalidate_dcache_range);
 147
 148 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 149                         unsigned long end)
 150 {
 151         __flush_dcache(start, end);
 152         if (vma == NULL || (vma->vm_flags & VM_EXEC))
 153                 __flush_icache(start, end);
 154 }
 155
 156 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 157 {
 158         unsigned long start = (unsigned long) page_address(page);
 159         unsigned long end = start + PAGE_SIZE;
 160
 161         __flush_dcache(start, end);
 162         __flush_icache(start, end);
 163 }
 164
 165 void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
 166                         unsigned long pfn)
 167 {
 168         unsigned long start = vmaddr;
 169         unsigned long end = start + PAGE_SIZE;
 170
 171         __flush_dcache(start, end);
 172         if (vma->vm_flags & VM_EXEC)
 173                 __flush_icache(start, end);
 174 }
 175
 176 void __flush_dcache_page(struct address_space *mapping, struct page *page)
 177 {
 178         /*
 179          * Writeback any data associated with the kernel mapping of this
 180          * page.  This ensures that data in the physical page is mutually
 181          * coherent with the kernels mapping.
 182          */
 183         unsigned long start = (unsigned long)page_address(page);
 184
 185         __flush_dcache_all(start, start + PAGE_SIZE);
 186 }
 187
 188 void flush_dcache_page(struct page *page)
 189 {
 190         struct address_space *mapping;
 191
 192         /*
 193          * The zero page is never written to, so never has any dirty
 194          * cache lines, and therefore never needs to be flushed.
 195          */
 196         if (page == ZERO_PAGE(0))
 197                 return;
 198
 199         mapping = page_mapping(page);
 200
 201         /* Flush this page if there are aliases. */
 202         if (mapping && !mapping_mapped(mapping)) {
 203                 clear_bit(PG_dcache_clean, &page->flags);
 204         } else {
 205                 __flush_dcache_page(mapping, page);
 206                 if (mapping) {
 207                         unsigned long start = (unsigned long)page_address(page);
 208                         flush_aliases(mapping,  page);
 209                         flush_icache_range(start, start + PAGE_SIZE);
 210                 }
 211                 set_bit(PG_dcache_clean, &page->flags);
 212         }
 213 }
 214 EXPORT_SYMBOL(flush_dcache_page);
 215
 216 void update_mmu_cache(struct vm_area_struct *vma,
 217                       unsigned long address, pte_t *pte)
 218 {
 219         unsigned long pfn = pte_pfn(*pte);
 220         struct page *page;
 221         struct address_space *mapping;
 222
 223         if (!pfn_valid(pfn))
 224                 return;
 225
 226         /*
 227         * The zero page is never written to, so never has any dirty
 228         * cache lines, and therefore never needs to be flushed.
 229         */
 230         page = pfn_to_page(pfn);
 231         if (page == ZERO_PAGE(0))
 232                 return;
 233
 234         mapping = page_mapping(page);
 235         if (!test_and_set_bit(PG_dcache_clean, &page->flags))
 236                 __flush_dcache_page(mapping, page);
 237
 238         if(mapping)
 239         {
 240                 flush_aliases(mapping, page);
 241                 if (vma->vm_flags & VM_EXEC)
 242                         flush_icache_page(vma, page);
 243         }
 244 }
 245
 246 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 247                     struct page *to)
 248 {
 249         __flush_dcache(vaddr, vaddr + PAGE_SIZE);
 250         __flush_icache(vaddr, vaddr + PAGE_SIZE);
 251         copy_page(vto, vfrom);
 252         __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
 253         __flush_icache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
 254 }
 255
 256 void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
 257 {
 258         __flush_dcache(vaddr, vaddr + PAGE_SIZE);
 259         __flush_icache(vaddr, vaddr + PAGE_SIZE);
 260         clear_page(addr);
 261         __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
 262         __flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
 263 }
 264
 265 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
 266                         unsigned long user_vaddr,
 267                         void *dst, void *src, int len)
 268 {
 269         flush_cache_page(vma, user_vaddr, page_to_pfn(page));
 270         memcpy(dst, src, len);
 271         __flush_dcache_all((unsigned long)src, (unsigned long)src + len);
 272         if (vma->vm_flags & VM_EXEC)
 273                 __flush_icache((unsigned long)src, (unsigned long)src + len);
 274 }
 275
 276 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 277                         unsigned long user_vaddr,
 278                         void *dst, void *src, int len)
 279 {
 280         flush_cache_page(vma, user_vaddr, page_to_pfn(page));
 281         memcpy(dst, src, len);
 282         __flush_dcache_all((unsigned long)dst, (unsigned long)dst + len);
 283         if (vma->vm_flags & VM_EXEC)
 284                 __flush_icache((unsigned long)dst, (unsigned long)dst + len);
 285 }