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MFC r333569: cpucontrol: improve Intel microcode revision check
authoremaste <emaste@FreeBSD.org>
Wed, 10 Oct 2018 15:54:01 +0000 (15:54 +0000)
committeremaste <emaste@FreeBSD.org>
Wed, 10 Oct 2018 15:54:01 +0000 (15:54 +0000)
commitcf3b425994272a0d0b1602846bbe51028fd67442
tree19f6ec3c47079792ab798d91ea9c0e61c61efbb9tree | snapshot
parent6b80461b379a6d7f1ded32a64747fa04a3b6330dcommit | diff
MFC r333569: cpucontrol: improve Intel microcode revision check

According to the Intel SDM (Volme 3, 9.11.7) the BIOS signature MSR
should be zeroed before executing cpuid (although in practice it does
not seem to matter).

PR: 192487
Submitted by: Dan Lukes
Reported by: Henrique de Moraes Holschuh
usr.sbin/cpucontrol/intel.c diff | blob | history
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