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_ARM610) || defined(CONFIG_CPU_ARM710) 29# ifdef _CACHE 30# define MULTI_CACHE 1 31# else 32# define _CACHE v3 33# endif 34#endif 35 36#if defined(CONFIG_CPU_ARM720T) 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_SA110) || defined(CONFIG_CPU_SA1100) 58# ifdef _CACHE 59# define MULTI_CACHE 1 60# else 61# define _CACHE v4wb 62# endif 63#endif 64 65#if defined(CONFIG_CPU_XSCALE) 66# ifdef _CACHE 67# define MULTI_CACHE 1 68# else 69# define _CACHE xscale 70# endif 71#endif 72 73#if defined(CONFIG_CPU_XSC3) 74# ifdef _CACHE 75# define MULTI_CACHE 1 76# else 77# define _CACHE xsc3 78# endif 79#endif 80 81#if defined(CONFIG_CPU_V6) 82//# ifdef _CACHE 83# define MULTI_CACHE 1 84//# else 85//# define _CACHE v6 86//# endif 87#endif 88 89#if !defined(_CACHE) && !defined(MULTI_CACHE) 90#error Unknown cache maintainence model 91#endif 92 93/* 94 * This flag is used to indicate that the page pointed to by a pte 95 * is dirty and requires cleaning before returning it to the user. 96 */ 97#define PG_dcache_dirty PG_arch_1 98 99/* 100 * MM Cache Management 101 * =================== 102 * 103 * The arch/arm/mm/cache-*.S and arch/arm/mm/proc-*.S files 104 * implement these methods. 105 * 106 * Start addresses are inclusive and end addresses are exclusive; 107 * start addresses should be rounded down, end addresses up. 108 * 109 * See Documentation/cachetlb.txt for more information. 110 * Please note that the implementation of these, and the required 111 * effects are cache-type (VIVT/VIPT/PIPT) specific. 112 * 113 * flush_cache_kern_all() 114 * 115 * Unconditionally clean and invalidate the entire cache. 116 * 117 * flush_cache_user_mm(mm) 118 * 119 * Clean and invalidate all user space cache entries 120 * before a change of page tables. 121 * 122 * flush_cache_user_range(start, end, flags) 123 * 124 * Clean and invalidate a range of cache entries in the 125 * specified address space before a change of page tables. 126 * - start - user start address (inclusive, page aligned) 127 * - end - user end address (exclusive, page aligned) 128 * - flags - vma->vm_flags field 129 * 130 * coherent_kern_range(start, end) 131 * 132 * Ensure coherency between the Icache and the Dcache in the 133 * region described by start, end. If you have non-snooping 134 * Harvard caches, you need to implement this function. 135 * - start - virtual start address 136 * - end - virtual end address 137 * 138 * DMA Cache Coherency 139 * =================== 140 * 141 * dma_inv_range(start, end) 142 * 143 * Invalidate (discard) the specified virtual address range. 144 * May not write back any entries. If 'start' or 'end' 145 * are not cache line aligned, those lines must be written 146 * back. 147 * - start - virtual start address 148 * - end - virtual end address 149 * 150 * dma_clean_range(start, end) 151 * 152 * Clean (write back) the specified virtual address range. 153 * - start - virtual start address 154 * - end - virtual end address 155 * 156 * dma_flush_range(start, end) 157 * 158 * Clean and invalidate the specified virtual address range. 159 * - start - virtual start address 160 * - end - virtual end address 161 */ 162 163struct cpu_cache_fns { 164 void (*flush_kern_all)(void); 165 void (*flush_user_all)(void); 166 void (*flush_user_range)(unsigned long, unsigned long, unsigned int); 167 168 void (*coherent_kern_range)(unsigned long, unsigned long); 169 void (*coherent_user_range)(unsigned long, unsigned long); 170 void (*flush_kern_dcache_page)(void *); 171 172 void (*dma_inv_range)(unsigned long, unsigned long); 173 void (*dma_clean_range)(unsigned long, unsigned long); 174 void (*dma_flush_range)(unsigned long, unsigned long); 175}; 176 177/* 178 * Select the calling method 179 */ 180#ifdef MULTI_CACHE 181 182extern struct cpu_cache_fns cpu_cache; 183 184#define __cpuc_flush_kern_all cpu_cache.flush_kern_all 185#define __cpuc_flush_user_all cpu_cache.flush_user_all 186#define __cpuc_flush_user_range cpu_cache.flush_user_range 187#define __cpuc_coherent_kern_range cpu_cache.coherent_kern_range 188#define __cpuc_coherent_user_range cpu_cache.coherent_user_range 189#define __cpuc_flush_dcache_page cpu_cache.flush_kern_dcache_page 190 191/* 192 * These are private to the dma-mapping API. Do not use directly. 193 * Their sole purpose is to ensure that data held in the cache 194 * is visible to DMA, or data written by DMA to system memory is 195 * visible to the CPU. 196 */ 197#define dmac_inv_range cpu_cache.dma_inv_range 198#define dmac_clean_range cpu_cache.dma_clean_range 199#define dmac_flush_range cpu_cache.dma_flush_range 200 201#else 202 203#define __cpuc_flush_kern_all __glue(_CACHE,_flush_kern_cache_all) 204#define __cpuc_flush_user_all __glue(_CACHE,_flush_user_cache_all) 205#define __cpuc_flush_user_range __glue(_CACHE,_flush_user_cache_range) 206#define __cpuc_coherent_kern_range __glue(_CACHE,_coherent_kern_range) 207#define __cpuc_coherent_user_range __glue(_CACHE,_coherent_user_range) 208#define __cpuc_flush_dcache_page __glue(_CACHE,_flush_kern_dcache_page) 209 210extern void __cpuc_flush_kern_all(void); 211extern void __cpuc_flush_user_all(void); 212extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int); 213extern void __cpuc_coherent_kern_range(unsigned long, unsigned long); 214extern void __cpuc_coherent_user_range(unsigned long, unsigned long); 215extern void __cpuc_flush_dcache_page(void *); 216 217/* 218 * These are private to the dma-mapping API. Do not use directly. 219 * Their sole purpose is to ensure that data held in the cache 220 * is visible to DMA, or data written by DMA to system memory is 221 * visible to the CPU. 222 */ 223#define dmac_inv_range __glue(_CACHE,_dma_inv_range) 224#define dmac_clean_range __glue(_CACHE,_dma_clean_range) 225#define dmac_flush_range __glue(_CACHE,_dma_flush_range) 226 227extern void dmac_inv_range(unsigned long, unsigned long); 228extern void dmac_clean_range(unsigned long, unsigned long); 229extern void dmac_flush_range(unsigned long, unsigned long); 230 231#endif 232 233/* 234 * flush_cache_vmap() is used when creating mappings (eg, via vmap, 235 * vmalloc, ioremap etc) in kernel space for pages. Since the 236 * direct-mappings of these pages may contain cached data, we need 237 * to do a full cache flush to ensure that writebacks don't corrupt 238 * data placed into these pages via the new mappings. 239 */ 240#define flush_cache_vmap(start, end) flush_cache_all() 241#define flush_cache_vunmap(start, end) flush_cache_all() 242 243/* 244 * Copy user data from/to a page which is mapped into a different 245 * processes address space. Really, we want to allow our "user 246 * space" model to handle this. 247 */ 248#define copy_to_user_page(vma, page, vaddr, dst, src, len) \ 249 do { \ 250 memcpy(dst, src, len); \ 251 flush_ptrace_access(vma, page, vaddr, dst, len, 1);\ 252 } while (0) 253 254#define copy_from_user_page(vma, page, vaddr, dst, src, len) \ 255 do { \ 256 memcpy(dst, src, len); \ 257 } while (0) 258 259/* 260 * Convert calls to our calling convention. 261 */ 262#define flush_cache_all() __cpuc_flush_kern_all() 263#ifndef CONFIG_CPU_CACHE_VIPT 264static inline void flush_cache_mm(struct mm_struct *mm) 265{ 266 if (cpu_isset(smp_processor_id(), mm->cpu_vm_mask)) 267 __cpuc_flush_user_all(); 268} 269 270static inline void 271flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) 272{ 273 if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) 274 __cpuc_flush_user_range(start & PAGE_MASK, PAGE_ALIGN(end), 275 vma->vm_flags); 276} 277 278static inline void 279flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn) 280{ 281 if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) { 282 unsigned long addr = user_addr & PAGE_MASK; 283 __cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags); 284 } 285} 286 287static inline void 288flush_ptrace_access(struct vm_area_struct *vma, struct page *page, 289 unsigned long uaddr, void *kaddr, 290 unsigned long len, int write) 291{ 292 if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) { 293 unsigned long addr = (unsigned long)kaddr; 294 __cpuc_coherent_kern_range(addr, addr + len); 295 } 296} 297#else 298extern void flush_cache_mm(struct mm_struct *mm); 299extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 300extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn); 301extern void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, 302 unsigned long uaddr, void *kaddr, 303 unsigned long len, int write); 304#endif 305 306/* 307 * flush_cache_user_range is used when we want to ensure that the 308 * Harvard caches are synchronised for the user space address range. 309 * This is used for the ARM private sys_cacheflush system call. 310 */ 311#define flush_cache_user_range(vma,start,end) \ 312 __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end)) 313 314/* 315 * Perform necessary cache operations to ensure that data previously 316 * stored within this range of addresses can be executed by the CPU. 317 */ 318#define flush_icache_range(s,e) __cpuc_coherent_kern_range(s,e) 319 320/* 321 * Perform necessary cache operations to ensure that the TLB will 322 * see data written in the specified area. 323 */ 324#define clean_dcache_area(start,size) cpu_dcache_clean_area(start, size) 325 326/* 327 * flush_dcache_page is used when the kernel has written to the page 328 * cache page at virtual address page->virtual. 329 * 330 * If this page isn't mapped (ie, page_mapping == NULL), or it might 331 * have userspace mappings, then we _must_ always clean + invalidate 332 * the dcache entries associated with the kernel mapping. 333 * 334 * Otherwise we can defer the operation, and clean the cache when we are 335 * about to change to user space. This is the same method as used on SPARC64. 336 * See update_mmu_cache for the user space part. 337 */ 338extern void flush_dcache_page(struct page *); 339 340#define flush_dcache_mmap_lock(mapping) \ 341 write_lock_irq(&(mapping)->tree_lock) 342#define flush_dcache_mmap_unlock(mapping) \ 343 write_unlock_irq(&(mapping)->tree_lock) 344 345#define flush_icache_user_range(vma,page,addr,len) \ 346 flush_dcache_page(page) 347 348/* 349 * We don't appear to need to do anything here. In fact, if we did, we'd 350 * duplicate cache flushing elsewhere performed by flush_dcache_page(). 351 */ 352#define flush_icache_page(vma,page) do { } while (0) 353 354#define __cacheid_present(val) (val != read_cpuid(CPUID_ID)) 355#define __cacheid_vivt(val) ((val & (15 << 25)) != (14 << 25)) 356#define __cacheid_vipt(val) ((val & (15 << 25)) == (14 << 25)) 357#define __cacheid_vipt_nonaliasing(val) ((val & (15 << 25 | 1 << 23)) == (14 << 25)) 358#define __cacheid_vipt_aliasing(val) ((val & (15 << 25 | 1 << 23)) == (14 << 25 | 1 << 23)) 359 360#if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT) 361 362#define cache_is_vivt() 1 363#define cache_is_vipt() 0 364#define cache_is_vipt_nonaliasing() 0 365#define cache_is_vipt_aliasing() 0 366 367#elif defined(CONFIG_CPU_CACHE_VIPT) 368 369#define cache_is_vivt() 0 370#define cache_is_vipt() 1 371#define cache_is_vipt_nonaliasing() \ 372 ({ \ 373 unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ 374 __cacheid_vipt_nonaliasing(__val); \ 375 }) 376 377#define cache_is_vipt_aliasing() \ 378 ({ \ 379 unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ 380 __cacheid_vipt_aliasing(__val); \ 381 }) 382 383#else 384 385#define cache_is_vivt() \ 386 ({ \ 387 unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ 388 (!__cacheid_present(__val)) || __cacheid_vivt(__val); \ 389 }) 390 391#define cache_is_vipt() \ 392 ({ \ 393 unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ 394 __cacheid_present(__val) && __cacheid_vipt(__val); \ 395 }) 396 397#define cache_is_vipt_nonaliasing() \ 398 ({ \ 399 unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ 400 __cacheid_present(__val) && \ 401 __cacheid_vipt_nonaliasing(__val); \ 402 }) 403 404#define cache_is_vipt_aliasing() \ 405 ({ \ 406 unsigned int __val = read_cpuid(CPUID_CACHETYPE); \ 407 __cacheid_present(__val) && \ 408 __cacheid_vipt_aliasing(__val); \ 409 }) 410 411#endif 412 413#endif 414