kern_cctr.c: Fix broken indentation.

No functional change intended.

Eliminate l->l_ncsw and l->l_nivcsw. From memory think they were added
before we had per-LWP struct rusage; the same is now tracked there.

Add some more detail/explanation to the calibration timing diagram.

Fix cycle counter-based time keeping on Alpha in MP environments by using
a simpler calibration algorithm for the CC timecounter. Proposed in 2018
by Naruaki Etomi:

https://mail-index.netbsd.org/tech-kern/2018/01/14/msg022940.html

This patch is largely based on the proposed change, but avoids changing
any other timecounter logic, and re-factors things a bit to keep them
as MI as possible.

Fix 'unknown' spellos

branches: 1.9.66;
remove extra semicolons.

branches: 1.8.6; 1.8.14;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.7.2;
Remove clause 3 and 4 from TNF licenses

Make preemption safe.

branches: 1.5.2; 1.5.4;
Allow MD cycle counter routines to pass their own optimized
tc_get_timecount function to MI cc_init().

Use cpu index instead of the machine dependend, not very expressive
cpuid when naming user-visible kernel entities.

branches: 1.3.10; 1.3.14;
fix typo in comment

branches: 1.2.2;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.1.4; 1.1.6; 1.1.8; 1.1.10; 1.1.12; 1.1.16; 1.1.18;
Add sys/kern/kern_cctr.c, which contains MI cpu cyclecounter based
timecounter(9) support functions split out from sys/arch/x86/x86/tsc.c.
Written by and ok'ed to commit by kardel@.

Also add <sys/cctr.h>, which is copied from #ifdef __HAVE_TIMECOUNTER
part of <sys/cc_microtime.h> to migrate MI kern_cctr.c per each port.

Add some more detail/explanation to the calibration timing diagram.

Fix cycle counter-based time keeping on Alpha in MP environments by using
a simpler calibration algorithm for the CC timecounter. Proposed in 2018
by Naruaki Etomi:

https://mail-index.netbsd.org/tech-kern/2018/01/14/msg022940.html

This patch is largely based on the proposed change, but avoids changing
any other timecounter logic, and re-factors things a bit to keep them
as MI as possible.

Fix 'unknown' spellos

branches: 1.9.66;
remove extra semicolons.

branches: 1.8.6; 1.8.14;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.7.2;
Remove clause 3 and 4 from TNF licenses

Make preemption safe.

branches: 1.5.2; 1.5.4;
Allow MD cycle counter routines to pass their own optimized
tc_get_timecount function to MI cc_init().

Use cpu index instead of the machine dependend, not very expressive
cpuid when naming user-visible kernel entities.

branches: 1.3.10; 1.3.14;
fix typo in comment

branches: 1.2.2;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.1.4; 1.1.6; 1.1.8; 1.1.10; 1.1.12; 1.1.16; 1.1.18;
Add sys/kern/kern_cctr.c, which contains MI cpu cyclecounter based
timecounter(9) support functions split out from sys/arch/x86/x86/tsc.c.
Written by and ok'ed to commit by kardel@.

Also add <sys/cctr.h>, which is copied from #ifdef __HAVE_TIMECOUNTER
part of <sys/cc_microtime.h> to migrate MI kern_cctr.c per each port.

Fix 'unknown' spellos

remove extra semicolons.

branches: 1.8.6; 1.8.14;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.7.2;
Remove clause 3 and 4 from TNF licenses

Make preemption safe.

branches: 1.5.2; 1.5.4;
Allow MD cycle counter routines to pass their own optimized
tc_get_timecount function to MI cc_init().

Use cpu index instead of the machine dependend, not very expressive
cpuid when naming user-visible kernel entities.

branches: 1.3.10; 1.3.14;
fix typo in comment

branches: 1.2.2;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.1.4; 1.1.6; 1.1.8; 1.1.10; 1.1.12; 1.1.16; 1.1.18;
Add sys/kern/kern_cctr.c, which contains MI cpu cyclecounter based
timecounter(9) support functions split out from sys/arch/x86/x86/tsc.c.
Written by and ok'ed to commit by kardel@.

Also add <sys/cctr.h>, which is copied from #ifdef __HAVE_TIMECOUNTER
part of <sys/cc_microtime.h> to migrate MI kern_cctr.c per each port.