Date: Mon, 19 Jun 2006 07:51:47 +0000 (UTC) From: David Xu <davidxu@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/include specialreg.h src/sys/i386/i386 identcpu.c Message-ID: <200606190751.k5J7pl83027198@repoman.freebsd.org>
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davidxu 2006-06-19 07:51:47 UTC
FreeBSD src repository
Modified files:
sys/i386/include specialreg.h
sys/i386/i386 identcpu.c
Log:
Clear bit 22 in MSR IA32_MISC_ENABLE, according to Intel document,
when the bit 22 is set to 1, CPUID with EAX=0 returns a maximum
value in EAX[7..0] of 3, when set to 0(default), CPUID with EAX=0
returns the number corresponding to the maximum standard function
supported. On my machine, BIOS sets the bit to 1 to make it to be
compatible with old OS, this causes dual-core Pentium-D (two
physical cores) to be identified as hyperthreading (two logical
cores) by function mp_topology().
Revision Changes Path
1.163 +11 -0 src/sys/i386/i386/identcpu.c
1.30 +1 -0 src/sys/i386/include/specialreg.h
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