Add support for the new clflushopt instruction. This instruction was announced in the document "Intel Architecture Instruction Set Extensions Programming Reference" with Ref # 319433-018.
http://download-software.intel.com/sites/default/files/managed/50/1a/319433-018.pdf Signed-off-by: Ross Zwisler <ross.zwis...@linux.intel.com> Cc: H Peter Anvin <h.peter.an...@intel.com> Cc: Ingo Molnar <mi...@kernel.org> Cc: Thomas Gleixner <t...@linutronix.de> --- arch/x86/include/asm/cpufeature.h | 1 + arch/x86/include/asm/special_insns.h | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index 89270b4..bfad1ad 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -219,6 +219,7 @@ #define X86_FEATURE_RDSEED (9*32+18) /* The RDSEED instruction */ #define X86_FEATURE_ADX (9*32+19) /* The ADCX and ADOX instructions */ #define X86_FEATURE_SMAP (9*32+20) /* Supervisor Mode Access Prevention */ +#define X86_FEATURE_CLFLSHOPT (9*32+23) /* "clflushopt" CLFLUSHOPT instruction */ /* * BUG word(s) diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h index 645cad2..617389a 100644 --- a/arch/x86/include/asm/special_insns.h +++ b/arch/x86/include/asm/special_insns.h @@ -191,6 +191,14 @@ static inline void clflush(volatile void *__p) asm volatile("clflush %0" : "+m" (*(volatile char __force *)__p)); } +static inline void clflushopt(volatile void *__p) +{ + alternative_io(".byte " __stringify(NOP_DS_PREFIX) "; clflush %P0", + ".byte 0x66; clflush %P0", + X86_FEATURE_CLFLSHOPT, + "+m" (*(volatile char __force *)__p)); +} + #define nop() asm volatile ("nop") -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
