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 ...
jhb at freebsd.org
Fri Aug 8 17:25:05 UTC 2008
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
> 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.
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