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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#include <linux/pagemap.h>
15
16#include <asm/cacheflush.h>
17#include <asm/cpuinfo.h>
18
19static 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
38static 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
54static 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
74static 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
98void flush_cache_all(void)
99{
100 __flush_dcache(0, cpuinfo.dcache_size);
101 __flush_icache(0, cpuinfo.icache_size);
102}
103
104void flush_cache_mm(struct mm_struct *mm)
105{
106 flush_cache_all();
107}
108
109void flush_cache_dup_mm(struct mm_struct *mm)
110{
111 flush_cache_all();
112}
113
114void flush_icache_range(unsigned long start, unsigned long end)
115{
116 __flush_dcache(start, end);
117 __flush_icache(start, end);
118}
119
120void flush_dcache_range(unsigned long start, unsigned long end)
121{
122 __flush_dcache(start, end);
123 __flush_icache(start, end);
124}
125EXPORT_SYMBOL(flush_dcache_range);
126
127void invalidate_dcache_range(unsigned long start, unsigned long end)
128{
129 __invalidate_dcache(start, end);
130}
131EXPORT_SYMBOL(invalidate_dcache_range);
132
133void 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
141void 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
150void 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
161void __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
173void 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}
199EXPORT_SYMBOL(flush_dcache_page);
200
201void 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
234void 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
244void 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
253void 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
264void 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}
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
18static 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
37static 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
53static 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
73static 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
97void flush_cache_all(void)
98{
99 __flush_dcache(0, cpuinfo.dcache_size);
100 __flush_icache(0, cpuinfo.icache_size);
101}
102
103void flush_cache_mm(struct mm_struct *mm)
104{
105 flush_cache_all();
106}
107
108void flush_cache_dup_mm(struct mm_struct *mm)
109{
110 flush_cache_all();
111}
112
113void flush_icache_range(unsigned long start, unsigned long end)
114{
115 __flush_dcache(start, end);
116 __flush_icache(start, end);
117}
118
119void flush_dcache_range(unsigned long start, unsigned long end)
120{
121 __flush_dcache(start, end);
122 __flush_icache(start, end);
123}
124EXPORT_SYMBOL(flush_dcache_range);
125
126void invalidate_dcache_range(unsigned long start, unsigned long end)
127{
128 __invalidate_dcache(start, end);
129}
130EXPORT_SYMBOL(invalidate_dcache_range);
131
132void 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
140void 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
149void 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
160void __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
172void 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_file(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}
198EXPORT_SYMBOL(flush_dcache_page);
199
200void update_mmu_cache(struct vm_area_struct *vma,
201 unsigned long address, pte_t *ptep)
202{
203 pte_t pte = *ptep;
204 unsigned long pfn = pte_pfn(pte);
205 struct page *page;
206 struct address_space *mapping;
207
208 reload_tlb_page(vma, address, pte);
209
210 if (!pfn_valid(pfn))
211 return;
212
213 /*
214 * The zero page is never written to, so never has any dirty
215 * cache lines, and therefore never needs to be flushed.
216 */
217 page = pfn_to_page(pfn);
218 if (page == ZERO_PAGE(0))
219 return;
220
221 mapping = page_mapping_file(page);
222 if (!test_and_set_bit(PG_dcache_clean, &page->flags))
223 __flush_dcache_page(mapping, page);
224
225 if(mapping)
226 {
227 flush_aliases(mapping, page);
228 if (vma->vm_flags & VM_EXEC)
229 flush_icache_page(vma, page);
230 }
231}
232
233void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
234 struct page *to)
235{
236 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
237 __flush_icache(vaddr, vaddr + PAGE_SIZE);
238 copy_page(vto, vfrom);
239 __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
240 __flush_icache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
241}
242
243void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
244{
245 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
246 __flush_icache(vaddr, vaddr + PAGE_SIZE);
247 clear_page(addr);
248 __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
249 __flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
250}
251
252void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
253 unsigned long user_vaddr,
254 void *dst, void *src, int len)
255{
256 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
257 memcpy(dst, src, len);
258 __flush_dcache((unsigned long)src, (unsigned long)src + len);
259 if (vma->vm_flags & VM_EXEC)
260 __flush_icache((unsigned long)src, (unsigned long)src + len);
261}
262
263void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
264 unsigned long user_vaddr,
265 void *dst, void *src, int len)
266{
267 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
268 memcpy(dst, src, len);
269 __flush_dcache((unsigned long)dst, (unsigned long)dst + len);
270 if (vma->vm_flags & VM_EXEC)
271 __flush_icache((unsigned long)dst, (unsigned long)dst + len);
272}