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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