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1 | /* |
2 | * linux/include/asm-arm/cacheflush.h | |
3 | * | |
4 | * Copyright (C) 1999-2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #ifndef _ASMARM_CACHEFLUSH_H | |
11 | #define _ASMARM_CACHEFLUSH_H | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/mm.h> | |
16 | ||
17 | #include <asm/mman.h> | |
18 | #include <asm/glue.h> | |
19 | ||
20 | /* | |
21 | * Cache Model | |
22 | * =========== | |
23 | */ | |
24 | #undef _CACHE | |
25 | #undef MULTI_CACHE | |
26 | ||
27 | #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710) | |
28 | # ifdef _CACHE | |
29 | # define MULTI_CACHE 1 | |
30 | # else | |
31 | # define _CACHE v3 | |
32 | # endif | |
33 | #endif | |
34 | ||
35 | #if defined(CONFIG_CPU_ARM720T) | |
36 | # ifdef _CACHE | |
37 | # define MULTI_CACHE 1 | |
38 | # else | |
39 | # define _CACHE v4 | |
40 | # endif | |
41 | #endif | |
42 | ||
43 | #if defined(CONFIG_CPU_ARM920T) || defined(CONFIG_CPU_ARM922T) || \ | |
44 | defined(CONFIG_CPU_ARM925T) || defined(CONFIG_CPU_ARM1020) | |
45 | # define MULTI_CACHE 1 | |
46 | #endif | |
47 | ||
48 | #if defined(CONFIG_CPU_ARM926T) | |
49 | # ifdef _CACHE | |
50 | # define MULTI_CACHE 1 | |
51 | # else | |
52 | # define _CACHE arm926 | |
53 | # endif | |
54 | #endif | |
55 | ||
56 | #if defined(CONFIG_CPU_SA110) || defined(CONFIG_CPU_SA1100) | |
57 | # ifdef _CACHE | |
58 | # define MULTI_CACHE 1 | |
59 | # else | |
60 | # define _CACHE v4wb | |
61 | # endif | |
62 | #endif | |
63 | ||
64 | #if defined(CONFIG_CPU_XSCALE) | |
65 | # ifdef _CACHE | |
66 | # define MULTI_CACHE 1 | |
67 | # else | |
68 | # define _CACHE xscale | |
69 | # endif | |
70 | #endif | |
71 | ||
72 | #if defined(CONFIG_CPU_V6) | |
73 | //# ifdef _CACHE | |
74 | # define MULTI_CACHE 1 | |
75 | //# else | |
76 | //# define _CACHE v6 | |
77 | //# endif | |
78 | #endif | |
79 | ||
80 | #if !defined(_CACHE) && !defined(MULTI_CACHE) | |
81 | #error Unknown cache maintainence model | |
82 | #endif | |
83 | ||
84 | /* | |
85 | * This flag is used to indicate that the page pointed to by a pte | |
86 | * is dirty and requires cleaning before returning it to the user. | |
87 | */ | |
88 | #define PG_dcache_dirty PG_arch_1 | |
89 | ||
90 | /* | |
91 | * MM Cache Management | |
92 | * =================== | |
93 | * | |
94 | * The arch/arm/mm/cache-*.S and arch/arm/mm/proc-*.S files | |
95 | * implement these methods. | |
96 | * | |
97 | * Start addresses are inclusive and end addresses are exclusive; | |
98 | * start addresses should be rounded down, end addresses up. | |
99 | * | |
100 | * See Documentation/cachetlb.txt for more information. | |
101 | * Please note that the implementation of these, and the required | |
102 | * effects are cache-type (VIVT/VIPT/PIPT) specific. | |
103 | * | |
104 | * flush_cache_kern_all() | |
105 | * | |
106 | * Unconditionally clean and invalidate the entire cache. | |
107 | * | |
108 | * flush_cache_user_mm(mm) | |
109 | * | |
110 | * Clean and invalidate all user space cache entries | |
111 | * before a change of page tables. | |
112 | * | |
113 | * flush_cache_user_range(start, end, flags) | |
114 | * | |
115 | * Clean and invalidate a range of cache entries in the | |
116 | * specified address space before a change of page tables. | |
117 | * - start - user start address (inclusive, page aligned) | |
118 | * - end - user end address (exclusive, page aligned) | |
119 | * - flags - vma->vm_flags field | |
120 | * | |
121 | * coherent_kern_range(start, end) | |
122 | * | |
123 | * Ensure coherency between the Icache and the Dcache in the | |
124 | * region described by start, end. If you have non-snooping | |
125 | * Harvard caches, you need to implement this function. | |
126 | * - start - virtual start address | |
127 | * - end - virtual end address | |
128 | * | |
129 | * DMA Cache Coherency | |
130 | * =================== | |
131 | * | |
132 | * dma_inv_range(start, end) | |
133 | * | |
134 | * Invalidate (discard) the specified virtual address range. | |
135 | * May not write back any entries. If 'start' or 'end' | |
136 | * are not cache line aligned, those lines must be written | |
137 | * back. | |
138 | * - start - virtual start address | |
139 | * - end - virtual end address | |
140 | * | |
141 | * dma_clean_range(start, end) | |
142 | * | |
143 | * Clean (write back) the specified virtual address range. | |
144 | * - start - virtual start address | |
145 | * - end - virtual end address | |
146 | * | |
147 | * dma_flush_range(start, end) | |
148 | * | |
149 | * Clean and invalidate the specified virtual address range. | |
150 | * - start - virtual start address | |
151 | * - end - virtual end address | |
152 | */ | |
153 | ||
154 | struct cpu_cache_fns { | |
155 | void (*flush_kern_all)(void); | |
156 | void (*flush_user_all)(void); | |
157 | void (*flush_user_range)(unsigned long, unsigned long, unsigned int); | |
158 | ||
159 | void (*coherent_kern_range)(unsigned long, unsigned long); | |
160 | void (*coherent_user_range)(unsigned long, unsigned long); | |
161 | void (*flush_kern_dcache_page)(void *); | |
162 | ||
163 | void (*dma_inv_range)(unsigned long, unsigned long); | |
164 | void (*dma_clean_range)(unsigned long, unsigned long); | |
165 | void (*dma_flush_range)(unsigned long, unsigned long); | |
166 | }; | |
167 | ||
168 | /* | |
169 | * Select the calling method | |
170 | */ | |
171 | #ifdef MULTI_CACHE | |
172 | ||
173 | extern struct cpu_cache_fns cpu_cache; | |
174 | ||
175 | #define __cpuc_flush_kern_all cpu_cache.flush_kern_all | |
176 | #define __cpuc_flush_user_all cpu_cache.flush_user_all | |
177 | #define __cpuc_flush_user_range cpu_cache.flush_user_range | |
178 | #define __cpuc_coherent_kern_range cpu_cache.coherent_kern_range | |
179 | #define __cpuc_coherent_user_range cpu_cache.coherent_user_range | |
180 | #define __cpuc_flush_dcache_page cpu_cache.flush_kern_dcache_page | |
181 | ||
182 | /* | |
183 | * These are private to the dma-mapping API. Do not use directly. | |
184 | * Their sole purpose is to ensure that data held in the cache | |
185 | * is visible to DMA, or data written by DMA to system memory is | |
186 | * visible to the CPU. | |
187 | */ | |
188 | #define dmac_inv_range cpu_cache.dma_inv_range | |
189 | #define dmac_clean_range cpu_cache.dma_clean_range | |
190 | #define dmac_flush_range cpu_cache.dma_flush_range | |
191 | ||
192 | #else | |
193 | ||
194 | #define __cpuc_flush_kern_all __glue(_CACHE,_flush_kern_cache_all) | |
195 | #define __cpuc_flush_user_all __glue(_CACHE,_flush_user_cache_all) | |
196 | #define __cpuc_flush_user_range __glue(_CACHE,_flush_user_cache_range) | |
197 | #define __cpuc_coherent_kern_range __glue(_CACHE,_coherent_kern_range) | |
198 | #define __cpuc_coherent_user_range __glue(_CACHE,_coherent_user_range) | |
199 | #define __cpuc_flush_dcache_page __glue(_CACHE,_flush_kern_dcache_page) | |
200 | ||
201 | extern void __cpuc_flush_kern_all(void); | |
202 | extern void __cpuc_flush_user_all(void); | |
203 | extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int); | |
204 | extern void __cpuc_coherent_kern_range(unsigned long, unsigned long); | |
205 | extern void __cpuc_coherent_user_range(unsigned long, unsigned long); | |
206 | extern void __cpuc_flush_dcache_page(void *); | |
207 | ||
208 | /* | |
209 | * These are private to the dma-mapping API. Do not use directly. | |
210 | * Their sole purpose is to ensure that data held in the cache | |
211 | * is visible to DMA, or data written by DMA to system memory is | |
212 | * visible to the CPU. | |
213 | */ | |
214 | #define dmac_inv_range __glue(_CACHE,_dma_inv_range) | |
215 | #define dmac_clean_range __glue(_CACHE,_dma_clean_range) | |
216 | #define dmac_flush_range __glue(_CACHE,_dma_flush_range) | |
217 | ||
218 | extern void dmac_inv_range(unsigned long, unsigned long); | |
219 | extern void dmac_clean_range(unsigned long, unsigned long); | |
220 | extern void dmac_flush_range(unsigned long, unsigned long); | |
221 | ||
222 | #endif | |
223 | ||
224 | /* | |
225 | * flush_cache_vmap() is used when creating mappings (eg, via vmap, | |
226 | * vmalloc, ioremap etc) in kernel space for pages. Since the | |
227 | * direct-mappings of these pages may contain cached data, we need | |
228 | * to do a full cache flush to ensure that writebacks don't corrupt | |
229 | * data placed into these pages via the new mappings. | |
230 | */ | |
231 | #define flush_cache_vmap(start, end) flush_cache_all() | |
232 | #define flush_cache_vunmap(start, end) flush_cache_all() | |
233 | ||
234 | /* | |
235 | * Copy user data from/to a page which is mapped into a different | |
236 | * processes address space. Really, we want to allow our "user | |
237 | * space" model to handle this. | |
238 | */ | |
239 | #define copy_to_user_page(vma, page, vaddr, dst, src, len) \ | |
240 | do { \ | |
241 | flush_cache_page(vma, vaddr, page_to_pfn(page));\ | |
242 | memcpy(dst, src, len); \ | |
243 | flush_dcache_page(page); \ | |
244 | } while (0) | |
245 | ||
246 | #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ | |
247 | do { \ | |
248 | flush_cache_page(vma, vaddr, page_to_pfn(page));\ | |
249 | memcpy(dst, src, len); \ | |
250 | } while (0) | |
251 | ||
252 | /* | |
253 | * Convert calls to our calling convention. | |
254 | */ | |
255 | #define flush_cache_all() __cpuc_flush_kern_all() | |
256 | ||
257 | static inline void flush_cache_mm(struct mm_struct *mm) | |
258 | { | |
259 | if (cpu_isset(smp_processor_id(), mm->cpu_vm_mask)) | |
260 | __cpuc_flush_user_all(); | |
261 | } | |
262 | ||
263 | static inline void | |
264 | flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
265 | { | |
266 | if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) | |
267 | __cpuc_flush_user_range(start & PAGE_MASK, PAGE_ALIGN(end), | |
268 | vma->vm_flags); | |
269 | } | |
270 | ||
271 | static inline void | |
272 | flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn) | |
273 | { | |
274 | if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) { | |
275 | unsigned long addr = user_addr & PAGE_MASK; | |
276 | __cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags); | |
277 | } | |
278 | } | |
279 | ||
280 | /* | |
281 | * flush_cache_user_range is used when we want to ensure that the | |
282 | * Harvard caches are synchronised for the user space address range. | |
283 | * This is used for the ARM private sys_cacheflush system call. | |
284 | */ | |
285 | #define flush_cache_user_range(vma,start,end) \ | |
286 | __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end)) | |
287 | ||
288 | /* | |
289 | * Perform necessary cache operations to ensure that data previously | |
290 | * stored within this range of addresses can be executed by the CPU. | |
291 | */ | |
292 | #define flush_icache_range(s,e) __cpuc_coherent_kern_range(s,e) | |
293 | ||
294 | /* | |
295 | * Perform necessary cache operations to ensure that the TLB will | |
296 | * see data written in the specified area. | |
297 | */ | |
298 | #define clean_dcache_area(start,size) cpu_dcache_clean_area(start, size) | |
299 | ||
300 | /* | |
301 | * flush_dcache_page is used when the kernel has written to the page | |
302 | * cache page at virtual address page->virtual. | |
303 | * | |
304 | * If this page isn't mapped (ie, page_mapping == NULL), or it might | |
305 | * have userspace mappings, then we _must_ always clean + invalidate | |
306 | * the dcache entries associated with the kernel mapping. | |
307 | * | |
308 | * Otherwise we can defer the operation, and clean the cache when we are | |
309 | * about to change to user space. This is the same method as used on SPARC64. | |
310 | * See update_mmu_cache for the user space part. | |
311 | */ | |
312 | extern void flush_dcache_page(struct page *); | |
313 | ||
314 | #define flush_dcache_mmap_lock(mapping) \ | |
315 | write_lock_irq(&(mapping)->tree_lock) | |
316 | #define flush_dcache_mmap_unlock(mapping) \ | |
317 | write_unlock_irq(&(mapping)->tree_lock) | |
318 | ||
319 | #define flush_icache_user_range(vma,page,addr,len) \ | |
320 | flush_dcache_page(page) | |
321 | ||
322 | /* | |
323 | * We don't appear to need to do anything here. In fact, if we did, we'd | |
324 | * duplicate cache flushing elsewhere performed by flush_dcache_page(). | |
325 | */ | |
326 | #define flush_icache_page(vma,page) do { } while (0) | |
327 | ||
328 | #define __cacheid_present(val) (val != read_cpuid(CPUID_ID)) | |
329 | #define __cacheid_vivt(val) ((val & (15 << 25)) != (14 << 25)) | |
330 | #define __cacheid_vipt(val) ((val & (15 << 25)) == (14 << 25)) | |
331 | #define __cacheid_vipt_nonaliasing(val) ((val & (15 << 25 | 1 << 23)) == (14 << 25)) | |
332 | #define __cacheid_vipt_aliasing(val) ((val & (15 << 25 | 1 << 23)) == (14 << 25 | 1 << 23)) | |
333 | ||
334 | #if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT) | |
335 | ||
336 | #define cache_is_vivt() 1 | |
337 | #define cache_is_vipt() 0 | |
338 | #define cache_is_vipt_nonaliasing() 0 | |
339 | #define cache_is_vipt_aliasing() 0 | |
340 | ||
341 | #elif defined(CONFIG_CPU_CACHE_VIPT) | |
342 | ||
343 | #define cache_is_vivt() 0 | |
344 | #define cache_is_vipt() 1 | |
345 | #define cache_is_vipt_nonaliasing() \ | |
346 | ({ \ | |
347 | unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ | |
348 | __cacheid_vipt_nonaliasing(__val); \ | |
349 | }) | |
350 | ||
351 | #define cache_is_vipt_aliasing() \ | |
352 | ({ \ | |
353 | unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ | |
354 | __cacheid_vipt_aliasing(__val); \ | |
355 | }) | |
356 | ||
357 | #else | |
358 | ||
359 | #define cache_is_vivt() \ | |
360 | ({ \ | |
361 | unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ | |
362 | (!__cacheid_present(__val)) || __cacheid_vivt(__val); \ | |
363 | }) | |
364 | ||
365 | #define cache_is_vipt() \ | |
366 | ({ \ | |
367 | unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ | |
368 | __cacheid_present(__val) && __cacheid_vipt(__val); \ | |
369 | }) | |
370 | ||
371 | #define cache_is_vipt_nonaliasing() \ | |
372 | ({ \ | |
373 | unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ | |
374 | __cacheid_present(__val) && \ | |
375 | __cacheid_vipt_nonaliasing(__val); \ | |
376 | }) | |
377 | ||
378 | #define cache_is_vipt_aliasing() \ | |
379 | ({ \ | |
380 | unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ | |
381 | __cacheid_present(__val) && \ | |
382 | __cacheid_vipt_aliasing(__val); \ | |
383 | }) | |
384 | ||
385 | #endif | |
386 | ||
387 | #endif |