sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

set_cputicker: use a bool

The third argument to this function indicates whether the supplied
ticker is fixed or variable, i.e. requiring calibration. Give this
argument a type and name that better conveys this purpose.

Reviewed by: kib, markj
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D35459

[PowerPC] Implement VDSO timebase access on powerpc*

Implement the remaining pieces needed to allow userland timestamp reading.

Rewritten based on an intial essay into the problem by Justin Hibbits.
(Copyright changed to my own on his request.)

Tested on ppc64 (POWER9 Talos II), powerpcspe (e500v2 RB800), and
powerpc (g4 PowerBook).

Reviewed by: jhibbits (in irc)
Sponsored by: Tag1 Consulting, Inc.
Differential Revision: https://reviews.freebsd.org/D26347

powerpc: clean up empty lines in .c and .h files

powerpc: Add file forgotten in r346144

Forgot to add the changes for DELAY(), which lowers priority during the
delay period. Also, mark the timebase read as volatile so newer GCC does
not optimize it away, as it reportedly does currently.

MFC after: 2 weeks
MFC with: r346144

Create a new macro for static DPCPU data.

On arm64 (and possible other architectures) we are unable to use static
DPCPU data in kernel modules. This is because the compiler will generate
PC-relative accesses, however the runtime-linker expects to be able to
relocate these.

In preparation to fix this create two macros depending on if the data is
global or static.

Reviewed by: bz, emaste, markj
Sponsored by: ABT Systems Ltd
Differential Revision: https://reviews.freebsd.org/D16140

PowerPC: Switch to more accurate unit to avoid division rounding

On POWER8 architecture there is a timer with 512Mhz frequency.
It has about 1,95ns period, but it is rounded to 1ns which is not accurate.

Submitted by: Patryk Duda <pdk@semihalf.com>
Obtained from: Semihalf
Reviewed by: wma
Sponsored by: IBM, QCM Technologies
Differential revision: https://reviews.freebsd.org/D14433

Use the TSLOG framework to record entry/exit timestamps for DELAY and
_vprintf; these functions are called in many places and can contribute
meaningfully to the total time spent booting.

sys/powerpc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

On AIM systems, it is not actually possible to stop the CPU timer, so we
just set it to a large default value (and inherit any previously existing
value), hoping it never turns over. Instead, silently allow spurious
one-shots from rollovers.

MFC after: 10 days

sys/powerpc: make use of the howmany() macro when available.

We have a howmany() macro in the <sys/param.h> header that is
convenient to re-use as it makes things easier to read.

Fix 80-column line wrapping in a comment.

Replace the two almost-exactly-identical AIM and Book-E clock.c
implementations with a single one after the application of a very small
amount of #ifdef.

This file was repocopied to src/sys/powerpc/aim, where it will
live on -- an afterlife.

Split decr_init() into two, with the section that reads the timebase
frequency from OpenFirmware moved out and into a routine that is called
from cpu_startup().

This allows correct reporting of the CPU clockspeed when printing out
CPU information at boot time.

Reported by: numerous
Reviewed by: marcel
MFC after: 1 day

Don't initialize the decrementer before initclocks() is called.
Use cpu_initclocks() for that as it assures that relevant locks
have been initialized.

Catch up with recent clock modifications:
- include <sys/clock.h> for inittodr prototype
- remove now-conflicting SECDAY definition that is in <sys/clock.h>

remove orphaned sysctl_machdep_adjkerntz()

Second part of a little cleanup in the calendar/timezone/RTC handling.

Split subr_clock.c in two parts (by repo-copy):
subr_clock.c contains generic RTC and calendaric stuff. etc.
subr_rtc.c contains the newbus'ified RTC interface.

Centralize the machdep.{adjkerntz,disable_rtc_set,wall_cmos_clock}
sysctls and associated variables into subr_clock.c. They are
not machine dependent and we have generic code that relies on being
present so they are not even optional.

Include needed clock.h.

Since DELAY() was moved, most <machine/clock.h> #includes have been
unnecessary.

Remove straggling reference to CPU_ macros

Tweak how the MD code calls the fooclock() methods some. Instead of
passing a pointer to an opaque clockframe structure and requiring the
MD code to supply CLKF_FOO() macros to extract needed values out of the
opaque structure, just pass the needed values directly. In practice this
means passing the pair (usermode, pc) to hardclock() and profclock() and
passing the boolean (usermode) to hardclock_cpu() and hardclock_process().
Other details:
- Axe clockframe and CLKF_FOO() macros on all architectures. Basically,
all the archs were taking a trapframe and converting it into a clockframe
one way or another. Now they can just extract the PC and usermode values
directly out of the trapframe and pass it to fooclock().
- Renamed hardclock_process() to hardclock_cpu() as the latter is more
accurate.
- On Alpha, we now run profclock() at hz (profhz == hz) rather than at
the slower stathz.
- On Alpha, for the TurboLaser machines that don't have an 8254
timecounter, call hardclock() directly. This removes an extra
conditional check from every clock interrupt on Alpha on the BSP.
There is probably room for even further pruning here by changing Alpha
to use the simplified timecounter we use on x86 with the lapic timer
since we don't get interrupts from the 8254 on Alpha anyway.
- On x86, clkintr() shouldn't ever be called now unless using_lapic_timer
is false, so add a KASSERT() to that affect and remove a condition
to slightly optimize the non-lapic case.
- Change prototypeof arm_handler_execute() so that it's first arg is a
trapframe pointer rather than a void pointer for clarity.
- Use KCOUNT macro in profclock() to lookup the kernel profiling bucket.

Tested on: alpha, amd64, arm, i386, ia64, sparc64
Reviewed by: bde (mostly)

- add wall_cmos_clock and adjkerntz variables, required by msdosfs
- support adjkerntz sysctl to silence NTP, though it's a null
implementation at the moment.

/* -> /*- for license, minor formatting changes

- fix compile warnings
- removed obsolete NetBSD-derived ADB conditionals

A syscons implementation using the 8-bit framebuffer set up by
OpenFirmware. Not at all optimized, but provides a PC-style
user-experience.

Tested on revA imac, B&W G3, 2k iBook, and G4 eMac.

DELAY must be a routine, not a macro definition.

Use __FBSDID rather than rcsid[].

Export the ns_per_tick variable through md_var.h rather than by declaring
it extern in cpu.c.

Replace the inline asm in delay() with a while loop. This may not be as
efficient but it appears to actually work. Some investigation may be
required.

- Rename the "powerpc" timecounter to the "decrementer" timecounter.
- Initialise it earlier.

Split statclock into statclock and profclock, and made the method for driving
statclock based on profhz when profiling is enabled MD, since most platforms
don't use this anyway. This removes the need for statclock_process, whose
only purpose was to subdivide profhz, and gets the profiling clock running
outside of sched_lock on platforms that implement suswintr.
Also changed the interface for starting and stopping the profiling clock to
do just that, instead of changing the rate of statclock, since they can now
be separate.

Reviewed by: jhb, tmm
Tested on: i386, sparc64

Fetch the initial time from the rtc OpenFirmware node. This is a short-term
measure until the rtc h/w driver is written, and it's a lot better
than having "jan 1 1970" on filesys times.

Approved by: benno

Many fixes to low-level trap and interrupt handling:

- Tidy up clock code. Don't repeatedly call hardclock().
- Remove intrnames, decrnest and intrcnt from locore.s
- Coalesce all trap handling into a single stub that then calls a dispatch
function.

Submitted by: Peter Grehan <peterg@ptree32.com.au>

Don't export timecounter structures under debug. with sysctl, they
contain no truly interesting data anymore.

Replace inline asm with it's inline function wrapper.

Remove __P.

Reveiwed by: benno

Various cleanups.

- Correct the type of the argument to delay() so as to not conflict with
sys/boot/common/bootstrap.h.
- Add a prototype for fork_trampoline().

Fix comment breakage.

Bring in NetBSD code used in the PowerPC port.

Reviewed by: obrien, dfr
Obtained from: NetBSD