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         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 }