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 #define CACHEID_VIPT_I_ALIASING         (1 << 4)
  10
  11 extern unsigned int cacheid;
  12
  13 #define cache_is_vivt()                 cacheid_is(CACHEID_VIVT)
  14 #define cache_is_vipt()                 cacheid_is(CACHEID_VIPT)
  15 #define cache_is_vipt_nonaliasing()     cacheid_is(CACHEID_VIPT_NONALIASING)
  16 #define cache_is_vipt_aliasing()        cacheid_is(CACHEID_VIPT_ALIASING)
  17 #define icache_is_vivt_asid_tagged()    cacheid_is(CACHEID_ASID_TAGGED)
  18 #define icache_is_vipt_aliasing()       cacheid_is(CACHEID_VIPT_I_ALIASING)
  19
  20 /*
  21  * __LINUX_ARM_ARCH__ is the minimum supported CPU architecture
  22  * Mask out support which will never be present on newer CPUs.
  23  * - v6+ is never VIVT
  24  * - v7+ VIPT never aliases on D-side
  25  */
  26 #if __LINUX_ARM_ARCH__ >= 7
  27 #define __CACHEID_ARCH_MIN      (CACHEID_VIPT_NONALIASING |\
  28                                  CACHEID_ASID_TAGGED |\
  29                                  CACHEID_VIPT_I_ALIASING)
  30 #elif __LINUX_ARM_ARCH__ >= 6
  31 #define __CACHEID_ARCH_MIN      (~CACHEID_VIVT)
  32 #else
  33 #define __CACHEID_ARCH_MIN      (~0)
  34 #endif
  35
  36 /*
  37  * Mask out support which isn't configured
  38  */
  39 #if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT)
  40 #define __CACHEID_ALWAYS        (CACHEID_VIVT)
  41 #define __CACHEID_NEVER         (~CACHEID_VIVT)
  42 #elif !defined(CONFIG_CPU_CACHE_VIVT) && defined(CONFIG_CPU_CACHE_VIPT)
  43 #define __CACHEID_ALWAYS        (0)
  44 #define __CACHEID_NEVER         (CACHEID_VIVT)
  45 #else
  46 #define __CACHEID_ALWAYS        (0)
  47 #define __CACHEID_NEVER         (0)
  48 #endif
  49
  50 static inline unsigned int __attribute__((pure)) cacheid_is(unsigned int mask)
  51 {
  52         return (__CACHEID_ALWAYS & mask) |
  53                (~__CACHEID_NEVER & __CACHEID_ARCH_MIN & mask & cacheid);
  54 }
  55
  56 #endif