cpuctl.8: fix grammar in a sentence

cpuctl(8): note that AMD updates need to be applied on all CPUs at once

Note that checking dmesg(8) after problems might be helpful.
Sort commands.
Bump date.

Unless -v is given, ignore EEXIST errors from the IOC_CPU_UCODE_APPLY ioctl()
used to implement "cpuctl ucode N", which indicates that the microcode
to be loaded already exists in the CPU, and as such, isn't really a
very interesting "error".

branches: 1.20.2; 1.20.10;
cpuctl.8: minor fixes

cpuctl.8: update the URL for AMD microcode, the previous site listed is
apparently defunct.

branches: 1.18.4;
note the default path for ucode updates can be found in sysctl.

branches: 1.17.6;
Sort SEE ALSO.

link back to intrctl(8), it xrefs cpuctl(8)

branches: 1.15.2;
allow most commands to specify more than one cpu. now you can online or
offline (or identify, or intr/nointr) a list of cpus all together.

Bump date. Quote minus with a backslash, for PostScript/PDF output.

Fix manual and usage bug. The ucode command can take [cpuno] argument.

Update URL

Use more common phrasing.

Add verbose flag.
On x86 cpu, cpuctl -v identify dumps the return values of the cpuid
functions. The max levels are taken from CPUID 0 and CPUID 8000_0000.
It's useful for the future CPU.

branches: 1.9.2;
Use Lk macro when dealing with URLs. While here update or remove some
dead URL links. Another part of PR/29238.

branches: 1.8.2;
Sort sections. Uppercase CPU.

Support CPU microcode loading via cpuctl(8).
Implemented and enabled via CPU_UCODE kernel config option
for x86 and Xen Dom0.
Tested on different AMD machines with different
CPU families.

ok wiz@ for the manpages
ok releng@
ok core@ via releng@

branches: 1.6.2;
Bump date for previous. Drop trailing whitespace. Improve formatting.

Add a dumb, mostly Solaris-compatible psrset command. It's missing some
options. Without it there's no easy way to test or use processor sets.

branches: 1.4.2;
PR port-amd64/37461 x86 cpu dmesg output is noisy

Port identifycpu() to userspace. The kernel lies and reports on cpuN while
actually using the values from cpu0, but this attempts to bind itself to the
requested CPU if running as root. That doesn't work properly yet due to
kern/38588, but will do once that's fixed.

Convert TNF licenses to new 2 clause variant

branches: 1.2.2;
Use cpu index instead of ID for cpuctl; extend listing to provide both
numbers (but now the ID is only informational).

branches: 1.1.8;
Add cpuctl(8). For now this is not much more than a toy for debugging and
benchmarking that allows taking CPUs online/offline.