include/asm-arm/cacheflush.h

   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/sched.h>
  14 #include <linux/mm.h>
  15
  16 #include <asm/glue.h>
  17 #include <asm/shmparam.h>
  18
  19 #define CACHE_COLOUR(vaddr)     ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT)
  20
  21 /*
  22  *      Cache Model
  23  *      ===========
  24  */
  25 #undef _CACHE
  26 #undef MULTI_CACHE
  27
  28 #if defined(CONFIG_CPU_CACHE_V3)
  29 # ifdef _CACHE
  30 #  define MULTI_CACHE 1
  31 # else
  32 #  define _CACHE v3
  33 # endif
  34 #endif
  35
  36 #if defined(CONFIG_CPU_CACHE_V4)
  37 # ifdef _CACHE
  38 #  define MULTI_CACHE 1
  39 # else
  40 #  define _CACHE v4
  41 # endif
  42 #endif
  43
  44 #if defined(CONFIG_CPU_ARM920T) || defined(CONFIG_CPU_ARM922T) || \
  45     defined(CONFIG_CPU_ARM925T) || defined(CONFIG_CPU_ARM1020)
  46 # define MULTI_CACHE 1
  47 #endif
  48
  49 #if defined(CONFIG_CPU_ARM926T)
  50 # ifdef _CACHE
  51 #  define MULTI_CACHE 1
  52 # else
  53 #  define _CACHE arm926
  54 # endif
  55 #endif
  56
  57 #if defined(CONFIG_CPU_ARM940T)
  58 # ifdef _CACHE
  59 #  define MULTI_CACHE 1
  60 # else
  61 #  define _CACHE arm940
  62 # endif
  63 #endif
  64
  65 #if defined(CONFIG_CPU_ARM946E)
  66 # ifdef _CACHE
  67 #  define MULTI_CACHE 1
  68 # else
  69 #  define _CACHE arm946
  70 # endif
  71 #endif
  72
  73 #if defined(CONFIG_CPU_CACHE_V4WB)
  74 # ifdef _CACHE
  75 #  define MULTI_CACHE 1
  76 # else
  77 #  define _CACHE v4wb
  78 # endif
  79 #endif
  80
  81 #if defined(CONFIG_CPU_XSCALE)
  82 # ifdef _CACHE
  83 #  define MULTI_CACHE 1
  84 # else
  85 #  define _CACHE xscale
  86 # endif
  87 #endif
  88
  89 #if defined(CONFIG_CPU_XSC3)
  90 # ifdef _CACHE
  91 #  define MULTI_CACHE 1
  92 # else
  93 #  define _CACHE xsc3
  94 # endif
  95 #endif
  96
  97 #if defined(CONFIG_CPU_V6)
  98 //# ifdef _CACHE
  99 #  define MULTI_CACHE 1
 100 //# else
 101 //#  define _CACHE v6
 102 //# endif
 103 #endif
 104
 105 #if defined(CONFIG_CPU_V7)
 106 //# ifdef _CACHE
 107 #  define MULTI_CACHE 1
 108 //# else
 109 //#  define _CACHE v7
 110 //# endif
 111 #endif
 112
 113 #if !defined(_CACHE) && !defined(MULTI_CACHE)
 114 #error Unknown cache maintainence model
 115 #endif
 116
 117 /*
 118  * This flag is used to indicate that the page pointed to by a pte
 119  * is dirty and requires cleaning before returning it to the user.
 120  */
 121 #define PG_dcache_dirty PG_arch_1
 122
 123 /*
 124  *      MM Cache Management
 125  *      ===================
 126  *
 127  *      The arch/arm/mm/cache-*.S and arch/arm/mm/proc-*.S files
 128  *      implement these methods.
 129  *
 130  *      Start addresses are inclusive and end addresses are exclusive;
 131  *      start addresses should be rounded down, end addresses up.
 132  *
 133  *      See Documentation/cachetlb.txt for more information.
 134  *      Please note that the implementation of these, and the required
 135  *      effects are cache-type (VIVT/VIPT/PIPT) specific.
 136  *
 137  *      flush_cache_kern_all()
 138  *
 139  *              Unconditionally clean and invalidate the entire cache.
 140  *
 141  *      flush_cache_user_mm(mm)
 142  *
 143  *              Clean and invalidate all user space cache entries
 144  *              before a change of page tables.
 145  *
 146  *      flush_cache_user_range(start, end, flags)
 147  *
 148  *              Clean and invalidate a range of cache entries in the
 149  *              specified address space before a change of page tables.
 150  *              - start - user start address (inclusive, page aligned)
 151  *              - end   - user end address   (exclusive, page aligned)
 152  *              - flags - vma->vm_flags field
 153  *
 154  *      coherent_kern_range(start, end)
 155  *
 156  *              Ensure coherency between the Icache and the Dcache in the
 157  *              region described by start, end.  If you have non-snooping
 158  *              Harvard caches, you need to implement this function.
 159  *              - start  - virtual start address
 160  *              - end    - virtual end address
 161  *
 162  *      DMA Cache Coherency
 163  *      ===================
 164  *
 165  *      dma_inv_range(start, end)
 166  *
 167  *              Invalidate (discard) the specified virtual address range.
 168  *              May not write back any entries.  If 'start' or 'end'
 169  *              are not cache line aligned, those lines must be written
 170  *              back.
 171  *              - start  - virtual start address
 172  *              - end    - virtual end address
 173  *
 174  *      dma_clean_range(start, end)
 175  *
 176  *              Clean (write back) the specified virtual address range.
 177  *              - start  - virtual start address
 178  *              - end    - virtual end address
 179  *
 180  *      dma_flush_range(start, end)
 181  *
 182  *              Clean and invalidate the specified virtual address range.
 183  *              - start  - virtual start address
 184  *              - end    - virtual end address
 185  */
 186
 187 struct cpu_cache_fns {
 188         void (*flush_kern_all)(void);
 189         void (*flush_user_all)(void);
 190         void (*flush_user_range)(unsigned long, unsigned long, unsigned int);
 191
 192         void (*coherent_kern_range)(unsigned long, unsigned long);
 193         void (*coherent_user_range)(unsigned long, unsigned long);
 194         void (*flush_kern_dcache_page)(void *);
 195
 196         void (*dma_inv_range)(const void *, const void *);
 197         void (*dma_clean_range)(const void *, const void *);
 198         void (*dma_flush_range)(const void *, const void *);
 199 };
 200
 201 struct outer_cache_fns {
 202         void (*inv_range)(unsigned long, unsigned long);
 203         void (*clean_range)(unsigned long, unsigned long);
 204         void (*flush_range)(unsigned long, unsigned long);
 205 };
 206
 207 /*
 208  * Select the calling method
 209  */
 210 #ifdef MULTI_CACHE
 211
 212 extern struct cpu_cache_fns cpu_cache;
 213
 214 #define __cpuc_flush_kern_all           cpu_cache.flush_kern_all
 215 #define __cpuc_flush_user_all           cpu_cache.flush_user_all
 216 #define __cpuc_flush_user_range         cpu_cache.flush_user_range
 217 #define __cpuc_coherent_kern_range      cpu_cache.coherent_kern_range
 218 #define __cpuc_coherent_user_range      cpu_cache.coherent_user_range
 219 #define __cpuc_flush_dcache_page        cpu_cache.flush_kern_dcache_page
 220
 221 /*
 222  * These are private to the dma-mapping API.  Do not use directly.
 223  * Their sole purpose is to ensure that data held in the cache
 224  * is visible to DMA, or data written by DMA to system memory is
 225  * visible to the CPU.
 226  */
 227 #define dmac_inv_range                  cpu_cache.dma_inv_range
 228 #define dmac_clean_range                cpu_cache.dma_clean_range
 229 #define dmac_flush_range                cpu_cache.dma_flush_range
 230
 231 #else
 232
 233 #define __cpuc_flush_kern_all           __glue(_CACHE,_flush_kern_cache_all)
 234 #define __cpuc_flush_user_all           __glue(_CACHE,_flush_user_cache_all)
 235 #define __cpuc_flush_user_range         __glue(_CACHE,_flush_user_cache_range)
 236 #define __cpuc_coherent_kern_range      __glue(_CACHE,_coherent_kern_range)
 237 #define __cpuc_coherent_user_range      __glue(_CACHE,_coherent_user_range)
 238 #define __cpuc_flush_dcache_page        __glue(_CACHE,_flush_kern_dcache_page)
 239
 240 extern void __cpuc_flush_kern_all(void);
 241 extern void __cpuc_flush_user_all(void);
 242 extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int);
 243 extern void __cpuc_coherent_kern_range(unsigned long, unsigned long);
 244 extern void __cpuc_coherent_user_range(unsigned long, unsigned long);
 245 extern void __cpuc_flush_dcache_page(void *);
 246
 247 /*
 248  * These are private to the dma-mapping API.  Do not use directly.
 249  * Their sole purpose is to ensure that data held in the cache
 250  * is visible to DMA, or data written by DMA to system memory is
 251  * visible to the CPU.
 252  */
 253 #define dmac_inv_range                  __glue(_CACHE,_dma_inv_range)
 254 #define dmac_clean_range                __glue(_CACHE,_dma_clean_range)
 255 #define dmac_flush_range                __glue(_CACHE,_dma_flush_range)
 256
 257 extern void dmac_inv_range(const void *, const void *);
 258 extern void dmac_clean_range(const void *, const void *);
 259 extern void dmac_flush_range(const void *, const void *);
 260
 261 #endif
 262
 263 #ifdef CONFIG_OUTER_CACHE
 264
 265 extern struct outer_cache_fns outer_cache;
 266
 267 static inline void outer_inv_range(unsigned long start, unsigned long end)
 268 {
 269         if (outer_cache.inv_range)
 270                 outer_cache.inv_range(start, end);
 271 }
 272 static inline void outer_clean_range(unsigned long start, unsigned long end)
 273 {
 274         if (outer_cache.clean_range)
 275                 outer_cache.clean_range(start, end);
 276 }
 277 static inline void outer_flush_range(unsigned long start, unsigned long end)
 278 {
 279         if (outer_cache.flush_range)
 280                 outer_cache.flush_range(start, end);
 281 }
 282
 283 #else
 284
 285 static inline void outer_inv_range(unsigned long start, unsigned long end)
 286 { }
 287 static inline void outer_clean_range(unsigned long start, unsigned long end)
 288 { }
 289 static inline void outer_flush_range(unsigned long start, unsigned long end)
 290 { }
 291
 292 #endif
 293
 294 /*
 295  * flush_cache_vmap() is used when creating mappings (eg, via vmap,
 296  * vmalloc, ioremap etc) in kernel space for pages.  Since the
 297  * direct-mappings of these pages may contain cached data, we need
 298  * to do a full cache flush to ensure that writebacks don't corrupt
 299  * data placed into these pages via the new mappings.
 300  */
 301 #define flush_cache_vmap(start, end)            flush_cache_all()
 302 #define flush_cache_vunmap(start, end)          flush_cache_all()
 303
 304 /*
 305  * Copy user data from/to a page which is mapped into a different
 306  * processes address space.  Really, we want to allow our "user
 307  * space" model to handle this.
 308  */
 309 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
 310         do {                                                    \
 311                 memcpy(dst, src, len);                          \
 312                 flush_ptrace_access(vma, page, vaddr, dst, len, 1);\
 313         } while (0)
 314
 315 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
 316         do {                                                    \
 317                 memcpy(dst, src, len);                          \
 318         } while (0)
 319
 320 /*
 321  * Convert calls to our calling convention.
 322  */
 323 #define flush_cache_all()               __cpuc_flush_kern_all()
 324 #ifndef CONFIG_CPU_CACHE_VIPT
 325 static inline void flush_cache_mm(struct mm_struct *mm)
 326 {
 327         if (cpu_isset(smp_processor_id(), mm->cpu_vm_mask))
 328                 __cpuc_flush_user_all();
 329 }
 330
 331 static inline void
 332 flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 333 {
 334         if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask))
 335                 __cpuc_flush_user_range(start & PAGE_MASK, PAGE_ALIGN(end),
 336                                         vma->vm_flags);
 337 }
 338
 339 static inline void
 340 flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn)
 341 {
 342         if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) {
 343                 unsigned long addr = user_addr & PAGE_MASK;
 344                 __cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags);
 345         }
 346 }
 347
 348 static inline void
 349 flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 350                          unsigned long uaddr, void *kaddr,
 351                          unsigned long len, int write)
 352 {
 353         if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) {
 354                 unsigned long addr = (unsigned long)kaddr;
 355                 __cpuc_coherent_kern_range(addr, addr + len);
 356         }
 357 }
 358 #else
 359 extern void flush_cache_mm(struct mm_struct *mm);
 360 extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 361 extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn);
 362 extern void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 363                                 unsigned long uaddr, void *kaddr,
 364                                 unsigned long len, int write);
 365 #endif
 366
 367 #define flush_cache_dup_mm(mm) flush_cache_mm(mm)
 368
 369 /*
 370  * flush_cache_user_range is used when we want to ensure that the
 371  * Harvard caches are synchronised for the user space address range.
 372  * This is used for the ARM private sys_cacheflush system call.
 373  */
 374 #define flush_cache_user_range(vma,start,end) \
 375         __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end))
 376
 377 /*
 378  * Perform necessary cache operations to ensure that data previously
 379  * stored within this range of addresses can be executed by the CPU.
 380  */
 381 #define flush_icache_range(s,e)         __cpuc_coherent_kern_range(s,e)
 382
 383 /*
 384  * Perform necessary cache operations to ensure that the TLB will
 385  * see data written in the specified area.
 386  */
 387 #define clean_dcache_area(start,size)   cpu_dcache_clean_area(start, size)
 388
 389 /*
 390  * flush_dcache_page is used when the kernel has written to the page
 391  * cache page at virtual address page->virtual.
 392  *
 393  * If this page isn't mapped (ie, page_mapping == NULL), or it might
 394  * have userspace mappings, then we _must_ always clean + invalidate
 395  * the dcache entries associated with the kernel mapping.
 396  *
 397  * Otherwise we can defer the operation, and clean the cache when we are
 398  * about to change to user space.  This is the same method as used on SPARC64.
 399  * See update_mmu_cache for the user space part.
 400  */
 401 extern void flush_dcache_page(struct page *);
 402
 403 extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
 404
 405 #define ARCH_HAS_FLUSH_ANON_PAGE
 406 static inline void flush_anon_page(struct vm_area_struct *vma,
 407                          struct page *page, unsigned long vmaddr)
 408 {
 409         extern void __flush_anon_page(struct vm_area_struct *vma,
 410                                 struct page *, unsigned long);
 411         if (PageAnon(page))
 412                 __flush_anon_page(vma, page, vmaddr);
 413 }
 414
 415 #define flush_dcache_mmap_lock(mapping) \
 416         write_lock_irq(&(mapping)->tree_lock)
 417 #define flush_dcache_mmap_unlock(mapping) \
 418         write_unlock_irq(&(mapping)->tree_lock)
 419
 420 #define flush_icache_user_range(vma,page,addr,len) \
 421         flush_dcache_page(page)
 422
 423 /*
 424  * We don't appear to need to do anything here.  In fact, if we did, we'd
 425  * duplicate cache flushing elsewhere performed by flush_dcache_page().
 426  */
 427 #define flush_icache_page(vma,page)     do { } while (0)
 428
 429 #define __cacheid_present(val)                  (val != read_cpuid(CPUID_ID))
 430 #define __cacheid_type_v7(val)                  ((val & (7 << 29)) == (4 << 29))
 431
 432 #define __cacheid_vivt_prev7(val)               ((val & (15 << 25)) != (14 << 25))
 433 #define __cacheid_vipt_prev7(val)               ((val & (15 << 25)) == (14 << 25))
 434 #define __cacheid_vipt_nonaliasing_prev7(val)   ((val & (15 << 25 | 1 << 23)) == (14 << 25))
 435 #define __cacheid_vipt_aliasing_prev7(val)      ((val & (15 << 25 | 1 << 23)) == (14 << 25 | 1 << 23))
 436
 437 #define __cacheid_vivt(val)                     (__cacheid_type_v7(val) ? 0 : __cacheid_vivt_prev7(val))
 438 #define __cacheid_vipt(val)                     (__cacheid_type_v7(val) ? 1 : __cacheid_vipt_prev7(val))
 439 #define __cacheid_vipt_nonaliasing(val)         (__cacheid_type_v7(val) ? 1 : __cacheid_vipt_nonaliasing_prev7(val))
 440 #define __cacheid_vipt_aliasing(val)            (__cacheid_type_v7(val) ? 0 : __cacheid_vipt_aliasing_prev7(val))
 441 #define __cacheid_vivt_asid_tagged_instr(val)   (__cacheid_type_v7(val) ? ((val & (3 << 14)) == (1 << 14)) : 0)
 442
 443 #if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT)
 444
 445 #define cache_is_vivt()                 1
 446 #define cache_is_vipt()                 0
 447 #define cache_is_vipt_nonaliasing()     0
 448 #define cache_is_vipt_aliasing()        0
 449 #define icache_is_vivt_asid_tagged()    0
 450
 451 #elif defined(CONFIG_CPU_CACHE_VIPT)
 452
 453 #define cache_is_vivt()                 0
 454 #define cache_is_vipt()                 1
 455 #define cache_is_vipt_nonaliasing()                                     \
 456         ({                                                              \
 457                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 458                 __cacheid_vipt_nonaliasing(__val);                      \
 459         })
 460
 461 #define cache_is_vipt_aliasing()                                        \
 462         ({                                                              \
 463                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 464                 __cacheid_vipt_aliasing(__val);                         \
 465         })
 466
 467 #define icache_is_vivt_asid_tagged()                                    \
 468         ({                                                              \
 469                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 470                 __cacheid_vivt_asid_tagged_instr(__val);                \
 471         })
 472
 473 #else
 474
 475 #define cache_is_vivt()                                                 \
 476         ({                                                              \
 477                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 478                 (!__cacheid_present(__val)) || __cacheid_vivt(__val);   \
 479         })
 480
 481 #define cache_is_vipt()                                                 \
 482         ({                                                              \
 483                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 484                 __cacheid_present(__val) && __cacheid_vipt(__val);      \
 485         })
 486
 487 #define cache_is_vipt_nonaliasing()                                     \
 488         ({                                                              \
 489                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 490                 __cacheid_present(__val) &&                             \
 491                  __cacheid_vipt_nonaliasing(__val);                     \
 492         })
 493
 494 #define cache_is_vipt_aliasing()                                        \
 495         ({                                                              \
 496                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 497                 __cacheid_present(__val) &&                             \
 498                  __cacheid_vipt_aliasing(__val);                        \
 499         })
 500
 501 #define icache_is_vivt_asid_tagged()                                    \
 502         ({                                                              \
 503                 unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
 504                 __cacheid_present(__val) &&                             \
 505                  __cacheid_vivt_asid_tagged_instr(__val);               \
 506         })
 507
 508 #endif
 509
 510 #endif