2 * arch/arm/include/asm/cacheflush.h
4 * Copyright (C) 1999-2002 Russell King
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.
10 #ifndef _ASMARM_CACHEFLUSH_H
11 #define _ASMARM_CACHEFLUSH_H
16 #include <asm/shmparam.h>
17 #include <asm/cachetype.h>
18 #include <asm/outercache.h>
20 #define CACHE_COLOUR(vaddr) ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT)
29 #if defined(CONFIG_CPU_CACHE_V3)
31 # define MULTI_CACHE 1
37 #if defined(CONFIG_CPU_CACHE_V4)
39 # define MULTI_CACHE 1
45 #if defined(CONFIG_CPU_ARM920T) || defined(CONFIG_CPU_ARM922T) || \
46 defined(CONFIG_CPU_ARM925T) || defined(CONFIG_CPU_ARM1020) || \
47 defined(CONFIG_CPU_ARM1026)
48 # define MULTI_CACHE 1
51 #if defined(CONFIG_CPU_FA526)
53 # define MULTI_CACHE 1
59 #if defined(CONFIG_CPU_ARM926T)
61 # define MULTI_CACHE 1
63 # define _CACHE arm926
67 #if defined(CONFIG_CPU_ARM940T)
69 # define MULTI_CACHE 1
71 # define _CACHE arm940
75 #if defined(CONFIG_CPU_ARM946E)
77 # define MULTI_CACHE 1
79 # define _CACHE arm946
83 #if defined(CONFIG_CPU_CACHE_V4WB)
85 # define MULTI_CACHE 1
91 #if defined(CONFIG_CPU_XSCALE)
93 # define MULTI_CACHE 1
95 # define _CACHE xscale
99 #if defined(CONFIG_CPU_XSC3)
101 # define MULTI_CACHE 1
107 #if defined(CONFIG_CPU_MOHAWK)
109 # define MULTI_CACHE 1
111 # define _CACHE mohawk
115 #if defined(CONFIG_CPU_FEROCEON)
116 # define MULTI_CACHE 1
119 #if defined(CONFIG_CPU_V6)
121 # define MULTI_CACHE 1
127 #if defined(CONFIG_CPU_V7)
129 # define MULTI_CACHE 1
135 #if !defined(_CACHE) && !defined(MULTI_CACHE)
136 #error Unknown cache maintainence model
140 * This flag is used to indicate that the page pointed to by a pte is clean
141 * and does not require cleaning before returning it to the user.
143 #define PG_dcache_clean PG_arch_1
146 * MM Cache Management
147 * ===================
149 * The arch/arm/mm/cache-*.S and arch/arm/mm/proc-*.S files
150 * implement these methods.
152 * Start addresses are inclusive and end addresses are exclusive;
153 * start addresses should be rounded down, end addresses up.
155 * See Documentation/cachetlb.txt for more information.
156 * Please note that the implementation of these, and the required
157 * effects are cache-type (VIVT/VIPT/PIPT) specific.
161 * Unconditionally clean and invalidate the entire cache.
165 * Clean and invalidate all user space cache entries
166 * before a change of page tables.
168 * flush_user_range(start, end, flags)
170 * Clean and invalidate a range of cache entries in the
171 * specified address space before a change of page tables.
172 * - start - user start address (inclusive, page aligned)
173 * - end - user end address (exclusive, page aligned)
174 * - flags - vma->vm_flags field
176 * coherent_kern_range(start, end)
178 * Ensure coherency between the Icache and the Dcache in the
179 * region described by start, end. If you have non-snooping
180 * Harvard caches, you need to implement this function.
181 * - start - virtual start address
182 * - end - virtual end address
184 * coherent_user_range(start, end)
186 * Ensure coherency between the Icache and the Dcache in the
187 * region described by start, end. If you have non-snooping
188 * Harvard caches, you need to implement this function.
189 * - start - virtual start address
190 * - end - virtual end address
192 * flush_kern_dcache_area(kaddr, size)
194 * Ensure that the data held in page is written back.
195 * - kaddr - page address
196 * - size - region size
198 * DMA Cache Coherency
199 * ===================
201 * dma_flush_range(start, end)
203 * Clean and invalidate the specified virtual address range.
204 * - start - virtual start address
205 * - end - virtual end address
208 struct cpu_cache_fns
{
209 void (*flush_kern_all
)(void);
210 void (*flush_user_all
)(void);
211 void (*flush_user_range
)(unsigned long, unsigned long, unsigned int);
213 void (*coherent_kern_range
)(unsigned long, unsigned long);
214 void (*coherent_user_range
)(unsigned long, unsigned long);
215 void (*flush_kern_dcache_area
)(void *, size_t);
217 void (*dma_map_area
)(const void *, size_t, int);
218 void (*dma_unmap_area
)(const void *, size_t, int);
220 void (*dma_flush_range
)(const void *, const void *);
224 * Select the calling method
228 extern struct cpu_cache_fns cpu_cache
;
230 #define __cpuc_flush_kern_all cpu_cache.flush_kern_all
231 #define __cpuc_flush_user_all cpu_cache.flush_user_all
232 #define __cpuc_flush_user_range cpu_cache.flush_user_range
233 #define __cpuc_coherent_kern_range cpu_cache.coherent_kern_range
234 #define __cpuc_coherent_user_range cpu_cache.coherent_user_range
235 #define __cpuc_flush_dcache_area cpu_cache.flush_kern_dcache_area
238 * These are private to the dma-mapping API. Do not use directly.
239 * Their sole purpose is to ensure that data held in the cache
240 * is visible to DMA, or data written by DMA to system memory is
241 * visible to the CPU.
243 #define dmac_map_area cpu_cache.dma_map_area
244 #define dmac_unmap_area cpu_cache.dma_unmap_area
245 #define dmac_flush_range cpu_cache.dma_flush_range
249 #define __cpuc_flush_kern_all __glue(_CACHE,_flush_kern_cache_all)
250 #define __cpuc_flush_user_all __glue(_CACHE,_flush_user_cache_all)
251 #define __cpuc_flush_user_range __glue(_CACHE,_flush_user_cache_range)
252 #define __cpuc_coherent_kern_range __glue(_CACHE,_coherent_kern_range)
253 #define __cpuc_coherent_user_range __glue(_CACHE,_coherent_user_range)
254 #define __cpuc_flush_dcache_area __glue(_CACHE,_flush_kern_dcache_area)
256 extern void __cpuc_flush_kern_all(void);
257 extern void __cpuc_flush_user_all(void);
258 extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int);
259 extern void __cpuc_coherent_kern_range(unsigned long, unsigned long);
260 extern void __cpuc_coherent_user_range(unsigned long, unsigned long);
261 extern void __cpuc_flush_dcache_area(void *, size_t);
264 * These are private to the dma-mapping API. Do not use directly.
265 * Their sole purpose is to ensure that data held in the cache
266 * is visible to DMA, or data written by DMA to system memory is
267 * visible to the CPU.
269 #define dmac_map_area __glue(_CACHE,_dma_map_area)
270 #define dmac_unmap_area __glue(_CACHE,_dma_unmap_area)
271 #define dmac_flush_range __glue(_CACHE,_dma_flush_range)
273 extern void dmac_map_area(const void *, size_t, int);
274 extern void dmac_unmap_area(const void *, size_t, int);
275 extern void dmac_flush_range(const void *, const void *);
280 * Copy user data from/to a page which is mapped into a different
281 * processes address space. Really, we want to allow our "user
282 * space" model to handle this.
284 extern void copy_to_user_page(struct vm_area_struct
*, struct page
*,
285 unsigned long, void *, const void *, unsigned long);
286 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
288 memcpy(dst, src, len); \
292 * Convert calls to our calling convention.
294 #define flush_cache_all() __cpuc_flush_kern_all()
296 static inline void vivt_flush_cache_mm(struct mm_struct
*mm
)
298 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm
)))
299 __cpuc_flush_user_all();
303 vivt_flush_cache_range(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
)
305 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma
->vm_mm
)))
306 __cpuc_flush_user_range(start
& PAGE_MASK
, PAGE_ALIGN(end
),
311 vivt_flush_cache_page(struct vm_area_struct
*vma
, unsigned long user_addr
, unsigned long pfn
)
313 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma
->vm_mm
))) {
314 unsigned long addr
= user_addr
& PAGE_MASK
;
315 __cpuc_flush_user_range(addr
, addr
+ PAGE_SIZE
, vma
->vm_flags
);
319 #ifndef CONFIG_CPU_CACHE_VIPT
320 #define flush_cache_mm(mm) \
321 vivt_flush_cache_mm(mm)
322 #define flush_cache_range(vma,start,end) \
323 vivt_flush_cache_range(vma,start,end)
324 #define flush_cache_page(vma,addr,pfn) \
325 vivt_flush_cache_page(vma,addr,pfn)
327 extern void flush_cache_mm(struct mm_struct
*mm
);
328 extern void flush_cache_range(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
);
329 extern void flush_cache_page(struct vm_area_struct
*vma
, unsigned long user_addr
, unsigned long pfn
);
332 #define flush_cache_dup_mm(mm) flush_cache_mm(mm)
335 * flush_cache_user_range is used when we want to ensure that the
336 * Harvard caches are synchronised for the user space address range.
337 * This is used for the ARM private sys_cacheflush system call.
339 #define flush_cache_user_range(vma,start,end) \
340 __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end))
343 * Perform necessary cache operations to ensure that data previously
344 * stored within this range of addresses can be executed by the CPU.
346 #define flush_icache_range(s,e) __cpuc_coherent_kern_range(s,e)
349 * Perform necessary cache operations to ensure that the TLB will
350 * see data written in the specified area.
352 #define clean_dcache_area(start,size) cpu_dcache_clean_area(start, size)
355 * flush_dcache_page is used when the kernel has written to the page
356 * cache page at virtual address page->virtual.
358 * If this page isn't mapped (ie, page_mapping == NULL), or it might
359 * have userspace mappings, then we _must_ always clean + invalidate
360 * the dcache entries associated with the kernel mapping.
362 * Otherwise we can defer the operation, and clean the cache when we are
363 * about to change to user space. This is the same method as used on SPARC64.
364 * See update_mmu_cache for the user space part.
366 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
367 extern void flush_dcache_page(struct page
*);
369 static inline void __flush_icache_all(void)
371 #ifdef CONFIG_ARM_ERRATA_411920
372 extern void v6_icache_inval_all(void);
373 v6_icache_inval_all();
374 #elif defined(CONFIG_SMP) && __LINUX_ARM_ARCH__ >= 7
375 asm("mcr p15, 0, %0, c7, c1, 0 @ invalidate I-cache inner shareable\n"
379 asm("mcr p15, 0, %0, c7, c5, 0 @ invalidate I-cache\n"
384 static inline void flush_kernel_vmap_range(void *addr
, int size
)
386 if ((cache_is_vivt() || cache_is_vipt_aliasing()))
387 __cpuc_flush_dcache_area(addr
, (size_t)size
);
389 static inline void invalidate_kernel_vmap_range(void *addr
, int size
)
391 if ((cache_is_vivt() || cache_is_vipt_aliasing()))
392 __cpuc_flush_dcache_area(addr
, (size_t)size
);
395 #define ARCH_HAS_FLUSH_ANON_PAGE
396 static inline void flush_anon_page(struct vm_area_struct
*vma
,
397 struct page
*page
, unsigned long vmaddr
)
399 extern void __flush_anon_page(struct vm_area_struct
*vma
,
400 struct page
*, unsigned long);
402 __flush_anon_page(vma
, page
, vmaddr
);
405 #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
406 static inline void flush_kernel_dcache_page(struct page
*page
)
410 #define flush_dcache_mmap_lock(mapping) \
411 spin_lock_irq(&(mapping)->tree_lock)
412 #define flush_dcache_mmap_unlock(mapping) \
413 spin_unlock_irq(&(mapping)->tree_lock)
415 #define flush_icache_user_range(vma,page,addr,len) \
416 flush_dcache_page(page)
419 * We don't appear to need to do anything here. In fact, if we did, we'd
420 * duplicate cache flushing elsewhere performed by flush_dcache_page().
422 #define flush_icache_page(vma,page) do { } while (0)
425 * flush_cache_vmap() is used when creating mappings (eg, via vmap,
426 * vmalloc, ioremap etc) in kernel space for pages. On non-VIPT
427 * caches, since the direct-mappings of these pages may contain cached
428 * data, we need to do a full cache flush to ensure that writebacks
429 * don't corrupt data placed into these pages via the new mappings.
431 static inline void flush_cache_vmap(unsigned long start
, unsigned long end
)
433 if (!cache_is_vipt_nonaliasing())
437 * set_pte_at() called from vmap_pte_range() does not
438 * have a DSB after cleaning the cache line.
443 static inline void flush_cache_vunmap(unsigned long start
, unsigned long end
)
445 if (!cache_is_vipt_nonaliasing())