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work around AMD erratum 793 for family 16h, models 00h-0Fh

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avg 2016-09-07 14:24:29 +00:00
parent df6befa4e8
commit e62f31d754
1 changed files with 14 additions and 0 deletions
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14
sys/amd64/amd64/initcpu.c
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@ -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);
}
}
}
/*