release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/include/asm/cachetype.h

   1 #ifndef __ASM_ARM_CACHETYPE_H
   2 #define __ASM_ARM_CACHETYPE_H
   3
   4 #define CACHEID_VIVT                    (1 << 0)
   5 #define CACHEID_VIPT_NONALIASING        (1 << 1)
   6 #define CACHEID_VIPT_ALIASING           (1 << 2)
   7 #define CACHEID_VIPT                    (CACHEID_VIPT_ALIASING|CACHEID_VIPT_NONALIASING)
   8 #define CACHEID_ASID_TAGGED             (1 << 3)
   9
  10 extern unsigned int cacheid;
  11
  12 #define cache_is_vivt()                 cacheid_is(CACHEID_VIVT)
  13 #define cache_is_vipt()                 cacheid_is(CACHEID_VIPT)
  14 #define cache_is_vipt_nonaliasing()     cacheid_is(CACHEID_VIPT_NONALIASING)
  15 #define cache_is_vipt_aliasing()        cacheid_is(CACHEID_VIPT_ALIASING)
  16 #define icache_is_vivt_asid_tagged()    cacheid_is(CACHEID_ASID_TAGGED)
  17
  18 /*
  19  * __LINUX_ARM_ARCH__ is the minimum supported CPU architecture
  20  * Mask out support which will never be present on newer CPUs.
  21  * - v6+ is never VIVT
  22  * - v7+ VIPT never aliases
  23  */
  24 #if __LINUX_ARM_ARCH__ >= 7
  25 #define __CACHEID_ARCH_MIN      (CACHEID_VIPT_NONALIASING | CACHEID_ASID_TAGGED)
  26 #elif __LINUX_ARM_ARCH__ >= 6
  27 #define __CACHEID_ARCH_MIN      (~CACHEID_VIVT)
  28 #else
  29 #define __CACHEID_ARCH_MIN      (~0)
  30 #endif
  31
  32 /*
  33  * Mask out support which isn't configured
  34  */
  35 #if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT)
  36 #define __CACHEID_ALWAYS        (CACHEID_VIVT)
  37 #define __CACHEID_NEVER         (~CACHEID_VIVT)
  38 #elif !defined(CONFIG_CPU_CACHE_VIVT) && defined(CONFIG_CPU_CACHE_VIPT)
  39 #define __CACHEID_ALWAYS        (0)
  40 #define __CACHEID_NEVER         (CACHEID_VIVT)
  41 #else
  42 #define __CACHEID_ALWAYS        (0)
  43 #define __CACHEID_NEVER         (0)
  44 #endif
  45
  46 static inline unsigned int __attribute__((pure)) cacheid_is(unsigned int mask)
  47 {
  48         return (__CACHEID_ALWAYS & mask) |
  49                (~__CACHEID_NEVER & __CACHEID_ARCH_MIN & mask & cacheid);
  50 }
  51
  52 #endif