cachetype.h

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#ifndef __ASM_ARM_CACHETYPE_H
#define __ASM_ARM_CACHETYPE_H

#define CACHEID_VIVT            (1 << 0)
#define CACHEID_VIPT_NONALIASING    (1 << 1)
#define CACHEID_VIPT_ALIASING       (1 << 2)
#define CACHEID_VIPT            (CACHEID_VIPT_ALIASING|CACHEID_VIPT_NONALIASING)
#define CACHEID_ASID_TAGGED     (1 << 3)
#define CACHEID_VIPT_I_ALIASING     (1 << 4)
#define CACHEID_PIPT            (1 << 5)

extern unsigned int cacheid;

#define cache_is_vivt()         cacheid_is(CACHEID_VIVT)
#define cache_is_vipt()         cacheid_is(CACHEID_VIPT)
#define cache_is_vipt_nonaliasing() cacheid_is(CACHEID_VIPT_NONALIASING)
#define cache_is_vipt_aliasing()    cacheid_is(CACHEID_VIPT_ALIASING)
#define icache_is_vivt_asid_tagged()    cacheid_is(CACHEID_ASID_TAGGED)
#define icache_is_vipt_aliasing()   cacheid_is(CACHEID_VIPT_I_ALIASING)
#define icache_is_pipt()        cacheid_is(CACHEID_PIPT)

/*
 * __LINUX_ARM_ARCH__ is the minimum supported CPU architecture
 * Mask out support which will never be present on newer CPUs.
 * - v6+ is never VIVT
 * - v7+ VIPT never aliases on D-side
 */
#if __LINUX_ARM_ARCH__ >= 7
#define __CACHEID_ARCH_MIN  (CACHEID_VIPT_NONALIASING |\
                 CACHEID_ASID_TAGGED |\
                 CACHEID_VIPT_I_ALIASING |\
                 CACHEID_PIPT)
#elif __LINUX_ARM_ARCH__ >= 6
#define __CACHEID_ARCH_MIN  (~CACHEID_VIVT)
#else
#define __CACHEID_ARCH_MIN  (~0)
#endif

/*
 * Mask out support which isn't configured
 */
#if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT)
#define __CACHEID_ALWAYS    (CACHEID_VIVT)
#define __CACHEID_NEVER     (~CACHEID_VIVT)
#elif !defined(CONFIG_CPU_CACHE_VIVT) && defined(CONFIG_CPU_CACHE_VIPT)
#define __CACHEID_ALWAYS    (0)
#define __CACHEID_NEVER     (CACHEID_VIVT)
#else
#define __CACHEID_ALWAYS    (0)
#define __CACHEID_NEVER     (0)
#endif

static inline unsigned int __attribute__((pure)) cacheid_is(unsigned int mask)
{
    return (__CACHEID_ALWAYS & mask) |
           (~__CACHEID_NEVER & __CACHEID_ARCH_MIN & mask & cacheid);
}

#endif