Author: avg
Date: Wed Sep 7 14:24:29 2016
New Revision: 305539
URL: https://svnweb.freebsd.org/changeset/base/305539
Log:
work around AMD erratum 793 for family 16h, models 00h-0Fh
Modified:
head/sys/amd64/amd64/initcpu.c
Modified: head/sys/amd64/amd64/initcpu.c
==============================================================================
--- head/sys/amd64/amd64/initcpu.c Wed Sep 7 14:01:58 2016
(r305538)
+++ head/sys/amd64/amd64/initcpu.c Wed Sep 7 14:24:29 2016
(r305539)
@@ -108,6 +108,20 @@ init_amd(void)
wrmsr(0xc001102a, msr);
}
}
+
+ /*
+ * Work around Erratum 793: Specific Combination of Writes to Write
+ * Combined Memory Types and Locked Instructions May Cause Core Hang.
+ * See Revision Guide for AMD Family 16h Models 00h-0Fh Processors,
+ * revision 3.04 or later, publication 51810.
+ */
+ if (CPUID_TO_FAMILY(cpu_id) == 0x16 && CPUID_TO_MODEL(cpu_id) <= 0xf) {
+ if ((cpu_feature2 & CPUID2_HV) == 0) {
+ msr = rdmsr(0xc0011020);
+ msr |= (uint64_t)1 << 15;
+ wrmsr(0xc0011020, msr);
+ }
+ }
}
/*
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