Date: Fri, 22 Mar 2019 14:35:15 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r345413 - in stable/12/sys: amd64/amd64 i386/i386 Message-ID: <201903221435.x2MEZFqa060537@repo.freebsd.org>
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Author: kib Date: Fri Mar 22 14:35:15 2019 New Revision: 345413 URL: https://svnweb.freebsd.org/changeset/base/345413 Log: MFC r345190: Provide deterministic (and somewhat useful) value for RDPID result, and for %ecx after RDTSCP. Modified: stable/12/sys/amd64/amd64/initcpu.c stable/12/sys/i386/i386/initcpu.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/amd64/amd64/initcpu.c ============================================================================== --- stable/12/sys/amd64/amd64/initcpu.c Fri Mar 22 11:46:35 2019 (r345412) +++ stable/12/sys/amd64/amd64/initcpu.c Fri Mar 22 14:35:15 2019 (r345413) @@ -265,6 +265,10 @@ initializecpu(void) init_via(); break; } + + if ((amd_feature & AMDID_RDTSCP) != 0 || + (cpu_stdext_feature2 & CPUID_STDEXT2_RDPID) != 0) + wrmsr(MSR_TSC_AUX, PCPU_GET(cpuid)); } void Modified: stable/12/sys/i386/i386/initcpu.c ============================================================================== --- stable/12/sys/i386/i386/initcpu.c Fri Mar 22 11:46:35 2019 (r345412) +++ stable/12/sys/i386/i386/initcpu.c Fri Mar 22 14:35:15 2019 (r345413) @@ -754,6 +754,9 @@ initializecpu(void) elf32_nxstack = 1; } #endif + if ((amd_feature & AMDID_RDTSCP) != 0 || + (cpu_stdext_feature2 & CPUID_STDEXT2_RDPID) != 0) + wrmsr(MSR_TSC_AUX, PCPU_GET(cpuid)); } void
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