Date: Sat, 19 Dec 2015 20:47:15 +0000 (UTC) From: "Conrad E. Meyer" <cem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r292478 - head/sys/x86/x86 Message-ID: <201512192047.tBJKlFXY045886@repo.freebsd.org>
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Author: cem Date: Sat Dec 19 20:47:15 2015 New Revision: 292478 URL: https://svnweb.freebsd.org/changeset/base/292478 Log: x86: Detect feature flags "CLWB" and "PCOMMIT" "The availability of CLWB instruction is indicated by the presence of the CPUID feature flag CLWB (bit 24 of the EBX register)." CLWB is similar to CLFLUSHOPT, except that it is not required to discard cacheline contents. "On processors that supports PCOMMIT, PCOMMIT is enumerated through CPUID (CPUID.7.0.EBX[22]) only when the feature is enabled by BIOS." PCOMMIT is used to cause store-to-memory operations to become persistent (protected from power failure). Sponsored by: EMC / Isilon Storage Division Modified: head/sys/x86/x86/identcpu.c Modified: head/sys/x86/x86/identcpu.c ============================================================================== --- head/sys/x86/x86/identcpu.c Sat Dec 19 20:42:01 2015 (r292477) +++ head/sys/x86/x86/identcpu.c Sat Dec 19 20:47:15 2015 (r292478) @@ -916,7 +916,9 @@ printcpuinfo(void) "\024ADX" /* Supervisor Mode Access Prevention */ "\025SMAP" + "\027PCOMMIT" "\030CLFLUSHOPT" + "\031CLWB" "\032PROCTRACE" "\033AVX512PF" "\034AVX512ER"
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