Date: Fri, 8 Aug 2008 21:10:52 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: Stanislav Sedov <stas@freebsd.org>, cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/share/man/man4 Makefile cpuctl.4 src/sys/amd64/amd64 support.S src/sys/amd64/conf NOTES src/sys/amd64/include cpufunc.h specialreg.h src/sys/conf files.amd64 files.i386 src/sys/dev/cpuctl cpuctl.c ... Message-ID: <20080808181052.GF97161@deviant.kiev.zoral.com.ua> In-Reply-To: <200808081251.17686.jhb@freebsd.org> References: <200808081631.m78GVG9i088754@repoman.freebsd.org> <200808081251.17686.jhb@freebsd.org>
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[-- Attachment #1 --] On Fri, Aug 08, 2008 at 12:51:17PM -0400, John Baldwin wrote: > On Friday 08 August 2008 12:26:53 pm Stanislav Sedov wrote: > > stas 2008-08-08 16:26:53 UTC > > > > FreeBSD src repository > > > > Modified files: > > share/man/man4 Makefile > > sys/amd64/amd64 support.S > > sys/amd64/conf NOTES > > sys/amd64/include cpufunc.h specialreg.h > > sys/conf files.amd64 files.i386 > > sys/i386/conf NOTES > > sys/i386/i386 support.s > > sys/i386/include cpufunc.h specialreg.h > > sys/modules Makefile > > sys/sys priv.h > > usr.sbin Makefile > > Added files: > > share/man/man4 cpuctl.4 > > sys/dev/cpuctl cpuctl.c > > sys/modules/cpuctl Makefile > > sys/sys cpuctl.h > > usr.sbin/cpucontrol Makefile amd.c amd.h cpucontrol.8 > > cpucontrol.c cpucontrol.h intel.c intel.h > > Log: > > SVN rev 181430 on 2008-08-08 16:26:53Z by stas > > > > - Add cpuctl(4) pseudo-device driver to provide access to some low-level > > features of CPUs like reading/writing machine-specific registers, > > retrieving cpuid data, and updating microcode. > > - Add cpucontrol(8) utility, that provides userland access to > > the features of cpuctl(4). > > - Add subsequent manpages. > > > > The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX > > is created for each cpu present in the systems. The pseudo-device minor > > number corresponds to the cpu number in the system. The cpuctl(4) pseudo- > > device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID > > and UPDATE. The first pair alows the caller to read/write machine-specific > > registers from the correspondent CPU. cpuid data could be retrieved using > > the CPUID call, and microcode updates are applied via UPDATE. > > > > The permissions are inforced based on the pseudo-device file permissions. > > RDMSR/CPUID will be allowed when the caller has read access to the device > > node, while WRMSR/UPDATE will be granted only when the node is opened > > for writing. There're also a number of priv(9) checks. > > > > The cpucontrol(8) utility is intened to provide userland access to > > the cpuctl(4) device features. The utility also allows one to apply > > cpu microcode updates. > > > > Currently only Intel and AMD cpus are supported and were tested. > > Note that cpuid isn't a privileged instruction, so I'm not sure it's really > worth having an ioctl for that particular case. It was discussed when patch was reviewed on current@. The ioctl allows to get cpuid information for specific processor, as opposed to some random core curthread happens to run ATM. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkicjCwACgkQC3+MBN1Mb4h3+gCeJUIPVJnJCt7Ey60fcIByau8l vY4AnjffHxRks4ToUqdV7yYKli1Ncowt =lMaa -----END PGP SIGNATURE-----
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