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Linux/arch/nios2/mm/cacheflush.c

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  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(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(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 

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