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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