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-rw-r--r--arch/sh/mm/cache.c316
1 files changed, 316 insertions, 0 deletions
diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c
new file mode 100644
index 000000000000..35c37b7f717a
--- /dev/null
+++ b/arch/sh/mm/cache.c
@@ -0,0 +1,316 @@
1/*
2 * arch/sh/mm/cache.c
3 *
4 * Copyright (C) 1999, 2000, 2002 Niibe Yutaka
5 * Copyright (C) 2002 - 2009 Paul Mundt
6 *
7 * Released under the terms of the GNU GPL v2.0.
8 */
9#include <linux/mm.h>
10#include <linux/init.h>
11#include <linux/mutex.h>
12#include <linux/fs.h>
13#include <linux/smp.h>
14#include <linux/highmem.h>
15#include <linux/module.h>
16#include <asm/mmu_context.h>
17#include <asm/cacheflush.h>
18
19void (*local_flush_cache_all)(void *args) = cache_noop;
20void (*local_flush_cache_mm)(void *args) = cache_noop;
21void (*local_flush_cache_dup_mm)(void *args) = cache_noop;
22void (*local_flush_cache_page)(void *args) = cache_noop;
23void (*local_flush_cache_range)(void *args) = cache_noop;
24void (*local_flush_dcache_page)(void *args) = cache_noop;
25void (*local_flush_icache_range)(void *args) = cache_noop;
26void (*local_flush_icache_page)(void *args) = cache_noop;
27void (*local_flush_cache_sigtramp)(void *args) = cache_noop;
28
29void (*__flush_wback_region)(void *start, int size);
30void (*__flush_purge_region)(void *start, int size);
31void (*__flush_invalidate_region)(void *start, int size);
32
33static inline void noop__flush_region(void *start, int size)
34{
35}
36
37static inline void cacheop_on_each_cpu(void (*func) (void *info), void *info,
38 int wait)
39{
40 preempt_disable();
41 smp_call_function(func, info, wait);
42 func(info);
43 preempt_enable();
44}
45
46void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
47 unsigned long vaddr, void *dst, const void *src,
48 unsigned long len)
49{
50 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
51 !test_bit(PG_dcache_dirty, &page->flags)) {
52 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
53 memcpy(vto, src, len);
54 kunmap_coherent(vto);
55 } else {
56 memcpy(dst, src, len);
57 if (boot_cpu_data.dcache.n_aliases)
58 set_bit(PG_dcache_dirty, &page->flags);
59 }
60
61 if (vma->vm_flags & VM_EXEC)
62 flush_cache_page(vma, vaddr, page_to_pfn(page));
63}
64
65void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
66 unsigned long vaddr, void *dst, const void *src,
67 unsigned long len)
68{
69 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
70 !test_bit(PG_dcache_dirty, &page->flags)) {
71 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
72 memcpy(dst, vfrom, len);
73 kunmap_coherent(vfrom);
74 } else {
75 memcpy(dst, src, len);
76 if (boot_cpu_data.dcache.n_aliases)
77 set_bit(PG_dcache_dirty, &page->flags);
78 }
79}
80
81void copy_user_highpage(struct page *to, struct page *from,
82 unsigned long vaddr, struct vm_area_struct *vma)
83{
84 void *vfrom, *vto;
85
86 vto = kmap_atomic(to, KM_USER1);
87
88 if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
89 !test_bit(PG_dcache_dirty, &from->flags)) {
90 vfrom = kmap_coherent(from, vaddr);
91 copy_page(vto, vfrom);
92 kunmap_coherent(vfrom);
93 } else {
94 vfrom = kmap_atomic(from, KM_USER0);
95 copy_page(vto, vfrom);
96 kunmap_atomic(vfrom, KM_USER0);
97 }
98
99 if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
100 __flush_purge_region(vto, PAGE_SIZE);
101
102 kunmap_atomic(vto, KM_USER1);
103 /* Make sure this page is cleared on other CPU's too before using it */
104 smp_wmb();
105}
106EXPORT_SYMBOL(copy_user_highpage);
107
108void clear_user_highpage(struct page *page, unsigned long vaddr)
109{
110 void *kaddr = kmap_atomic(page, KM_USER0);
111
112 clear_page(kaddr);
113
114 if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
115 __flush_purge_region(kaddr, PAGE_SIZE);
116
117 kunmap_atomic(kaddr, KM_USER0);
118}
119EXPORT_SYMBOL(clear_user_highpage);
120
121void __update_cache(struct vm_area_struct *vma,
122 unsigned long address, pte_t pte)
123{
124 struct page *page;
125 unsigned long pfn = pte_pfn(pte);
126
127 if (!boot_cpu_data.dcache.n_aliases)
128 return;
129
130 page = pfn_to_page(pfn);
131 if (pfn_valid(pfn) && page_mapping(page)) {
132 int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
133 if (dirty) {
134 unsigned long addr = (unsigned long)page_address(page);
135
136 if (pages_do_alias(addr, address & PAGE_MASK))
137 __flush_purge_region((void *)addr, PAGE_SIZE);
138 }
139 }
140}
141
142void __flush_anon_page(struct page *page, unsigned long vmaddr)
143{
144 unsigned long addr = (unsigned long) page_address(page);
145
146 if (pages_do_alias(addr, vmaddr)) {
147 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
148 !test_bit(PG_dcache_dirty, &page->flags)) {
149 void *kaddr;
150
151 kaddr = kmap_coherent(page, vmaddr);
152 /* XXX.. For now kunmap_coherent() does a purge */
153 /* __flush_purge_region((void *)kaddr, PAGE_SIZE); */
154 kunmap_coherent(kaddr);
155 } else
156 __flush_purge_region((void *)addr, PAGE_SIZE);
157 }
158}
159
160void flush_cache_all(void)
161{
162 cacheop_on_each_cpu(local_flush_cache_all, NULL, 1);
163}
164
165void flush_cache_mm(struct mm_struct *mm)
166{
167 cacheop_on_each_cpu(local_flush_cache_mm, mm, 1);
168}
169
170void flush_cache_dup_mm(struct mm_struct *mm)
171{
172 cacheop_on_each_cpu(local_flush_cache_dup_mm, mm, 1);
173}
174
175void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,
176 unsigned long pfn)
177{
178 struct flusher_data data;
179
180 data.vma = vma;
181 data.addr1 = addr;
182 data.addr2 = pfn;
183
184 cacheop_on_each_cpu(local_flush_cache_page, (void *)&data, 1);
185}
186
187void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
188 unsigned long end)
189{
190 struct flusher_data data;
191
192 data.vma = vma;
193 data.addr1 = start;
194 data.addr2 = end;
195
196 cacheop_on_each_cpu(local_flush_cache_range, (void *)&data, 1);
197}
198
199void flush_dcache_page(struct page *page)
200{
201 cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
202}
203
204void flush_icache_range(unsigned long start, unsigned long end)
205{
206 struct flusher_data data;
207
208 data.vma = NULL;
209 data.addr1 = start;
210 data.addr2 = end;
211
212 cacheop_on_each_cpu(local_flush_icache_range, (void *)&data, 1);
213}
214
215void flush_icache_page(struct vm_area_struct *vma, struct page *page)
216{
217 /* Nothing uses the VMA, so just pass the struct page along */
218 cacheop_on_each_cpu(local_flush_icache_page, page, 1);
219}
220
221void flush_cache_sigtramp(unsigned long address)
222{
223 cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
224}
225
226static void compute_alias(struct cache_info *c)
227{
228 c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
229 c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
230}
231
232static void __init emit_cache_params(void)
233{
234 printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
235 boot_cpu_data.icache.ways,
236 boot_cpu_data.icache.sets,
237 boot_cpu_data.icache.way_incr);
238 printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
239 boot_cpu_data.icache.entry_mask,
240 boot_cpu_data.icache.alias_mask,
241 boot_cpu_data.icache.n_aliases);
242 printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
243 boot_cpu_data.dcache.ways,
244 boot_cpu_data.dcache.sets,
245 boot_cpu_data.dcache.way_incr);
246 printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
247 boot_cpu_data.dcache.entry_mask,
248 boot_cpu_data.dcache.alias_mask,
249 boot_cpu_data.dcache.n_aliases);
250
251 /*
252 * Emit Secondary Cache parameters if the CPU has a probed L2.
253 */
254 if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
255 printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
256 boot_cpu_data.scache.ways,
257 boot_cpu_data.scache.sets,
258 boot_cpu_data.scache.way_incr);
259 printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
260 boot_cpu_data.scache.entry_mask,
261 boot_cpu_data.scache.alias_mask,
262 boot_cpu_data.scache.n_aliases);
263 }
264}
265
266void __init cpu_cache_init(void)
267{
268 compute_alias(&boot_cpu_data.icache);
269 compute_alias(&boot_cpu_data.dcache);
270 compute_alias(&boot_cpu_data.scache);
271
272 __flush_wback_region = noop__flush_region;
273 __flush_purge_region = noop__flush_region;
274 __flush_invalidate_region = noop__flush_region;
275
276 if (boot_cpu_data.family == CPU_FAMILY_SH2) {
277 extern void __weak sh2_cache_init(void);
278
279 sh2_cache_init();
280 }
281
282 if (boot_cpu_data.family == CPU_FAMILY_SH2A) {
283 extern void __weak sh2a_cache_init(void);
284
285 sh2a_cache_init();
286 }
287
288 if (boot_cpu_data.family == CPU_FAMILY_SH3) {
289 extern void __weak sh3_cache_init(void);
290
291 sh3_cache_init();
292
293 if ((boot_cpu_data.type == CPU_SH7705) &&
294 (boot_cpu_data.dcache.sets == 512)) {
295 extern void __weak sh7705_cache_init(void);
296
297 sh7705_cache_init();
298 }
299 }
300
301 if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
302 (boot_cpu_data.family == CPU_FAMILY_SH4A) ||
303 (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
304 extern void __weak sh4_cache_init(void);
305
306 sh4_cache_init();
307 }
308
309 if (boot_cpu_data.family == CPU_FAMILY_SH5) {
310 extern void __weak sh5_cache_init(void);
311
312 sh5_cache_init();
313 }
314
315 emit_cache_params();
316}
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