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>
next in thread | previous in thread | raw e-mail | index | archive | help
--ndWVA4pxvhlNOeHP Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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 > >=20 > > FreeBSD src repository > >=20 > > Modified files: > > share/man/man4 Makefile=20 > > sys/amd64/amd64 support.S=20 > > sys/amd64/conf NOTES=20 > > sys/amd64/include cpufunc.h specialreg.h=20 > > sys/conf files.amd64 files.i386=20 > > sys/i386/conf NOTES=20 > > sys/i386/i386 support.s=20 > > sys/i386/include cpufunc.h specialreg.h=20 > > sys/modules Makefile=20 > > sys/sys priv.h=20 > > usr.sbin Makefile=20 > > Added files: > > share/man/man4 cpuctl.4=20 > > sys/dev/cpuctl cpuctl.c=20 > > sys/modules/cpuctl Makefile=20 > > sys/sys cpuctl.h=20 > > usr.sbin/cpucontrol Makefile amd.c amd.h cpucontrol.8=20 > > cpucontrol.c cpucontrol.h intel.c intel.h=20 > > Log: > > SVN rev 181430 on 2008-08-08 16:26:53Z by stas > > =20 > > - Add cpuctl(4) pseudo-device driver to provide access to some low-le= vel > > 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. > > =20 > > The cpuctl(4) device operates as follows. The pseudo-device node cpuc= tlX > > is created for each cpu present in the systems. The pseudo-device min= or > > number corresponds to the cpu number in the system. The cpuctl(4) pse= udo- > > device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/C= PUID > > and UPDATE. The first pair alows the caller to read/write machine-spe= cific > > registers from the correspondent CPU. cpuid data could be retrieved u= sing > > the CPUID call, and microcode updates are applied via UPDATE. > > =20 > > The permissions are inforced based on the pseudo-device file permissi= ons. > > RDMSR/CPUID will be allowed when the caller has read access to the de= vice > > node, while WRMSR/UPDATE will be granted only when the node is opened > > for writing. There're also a number of priv(9) checks. > > =20 > > 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. > > =20 > > Currently only Intel and AMD cpus are supported and were tested. >=20 > Note that cpuid isn't a privileged instruction, so I'm not sure it's real= ly=20 > 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. --ndWVA4pxvhlNOeHP Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkicjCwACgkQC3+MBN1Mb4h3+gCeJUIPVJnJCt7Ey60fcIByau8l vY4AnjffHxRks4ToUqdV7yYKli1Ncowt =lMaa -----END PGP SIGNATURE----- --ndWVA4pxvhlNOeHP--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080808181052.GF97161>