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| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
| commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
| tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/arm/include/asm/cachetype.h | |
Initial import
Diffstat (limited to 'arch/arm/include/asm/cachetype.h')
| -rw-r--r-- | arch/arm/include/asm/cachetype.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cachetype.h b/arch/arm/include/asm/cachetype.h new file mode 100644 index 000000000..7ea78144a --- /dev/null +++ b/arch/arm/include/asm/cachetype.h @@ -0,0 +1,59 @@ +#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 |