cpuctl(8) - NetBSD Manual Pages

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CPUCTL(8)               NetBSD System Manager's Manual               CPUCTL(8)

cpuctl -- program to control CPUs
cpuctl [-v] command [arguments]
The cpuctl command can be used to control and inspect the state of CPUs in the system. The first argument, command, specifies the action to take. Valid com- mands are: identify cpu Output information on the specified CPU's features and capabilities. Not available on all architectures. list For each CPU in the system, display the current state and time of the last state change. offline cpuno Set the specified CPU off line. Unbound LWPs (lightweight processes) will not be exe- cuted on the CPU while it is off line. Bound LWPs will continue to be executed on the CPU, and device inter- rupts routed to the CPU will continue to be handled. A future release of the system may allow device interrupts to be re-routed away from individual CPUs. At least one CPU in the system must remain on line. online cpuno Set the specified CPU on line, making it available to run unbound LWPs. ucode [file] This applies the microcode patch on all CPUs. The default filename is used if no filename is specified. The identify command prints the installed version on that CPU. On success the identify command show differ- ent ucode versions before and after this command. Valid flags are: -v Be more verbose.
/dev/cpuctl control device /libdata/firmware/x86/amd/ The directory to install the microcode file for AMD CPUs into. The default filename is microcode_amd.bin for CPU families 0x10 to 0x14. The default filename is microcode_amd_famXXh.bin where XX is the CPU family starting with 15 (hex). Get it from http://www.amd64.org/microcode.html
Run cpuctl identify 0 and you should see something like this: cpu0: UCode version: 0x1000080 After applying the microcode patch with cpuctl ucode you can see with cpuctl identify 0 that the patch got applied: cpu0: UCode version: 0x1000083
psrset(8), schedctl(8)
The cpuctl command first appeared in NetBSD 5.0. NetBSD 7.1.2 December 23, 2013 NetBSD 7.1.2
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