From owner-cvs-all@FreeBSD.ORG Fri Aug 8 17:25:04 2008 Return-Path: Delivered-To: cvs-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E829A1065696; Fri, 8 Aug 2008 17:25:04 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (bigknife-pt.tunnel.tserv9.chi1.ipv6.he.net [IPv6:2001:470:1f10:75::2]) by mx1.freebsd.org (Postfix) with ESMTP id 77B538FC1C; Fri, 8 Aug 2008 17:25:04 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from localhost.corp.yahoo.com (john@localhost [IPv6:::1]) (authenticated bits=0) by server.baldwin.cx (8.14.2/8.14.2) with ESMTP id m78HOvQo030440; Fri, 8 Aug 2008 13:24:58 -0400 (EDT) (envelope-from jhb@freebsd.org) From: John Baldwin To: Stanislav Sedov Date: Fri, 8 Aug 2008 12:51:17 -0400 User-Agent: KMail/1.9.7 References: <200808081631.m78GVG9i088754@repoman.freebsd.org> In-Reply-To: <200808081631.m78GVG9i088754@repoman.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200808081251.17686.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-2.0.2 (server.baldwin.cx [IPv6:::1]); Fri, 08 Aug 2008 13:24:58 -0400 (EDT) X-Virus-Scanned: ClamAV 0.93.1/7981/Fri Aug 8 11:29:53 2008 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-2.5 required=4.2 tests=AWL,BAYES_00,NO_RELAYS autolearn=ham version=3.1.3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on server.baldwin.cx Cc: 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 ... X-BeenThere: cvs-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: CVS commit messages for the entire tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Aug 2008 17:25:05 -0000 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. -- John Baldwin