Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

After some off-list discussion, revert a number of changes to the
DPCPU_DEFINE and VNET_DEFINE macros, as these cause problems for various
people working on the affected files. A better long-term solution is
still being considered. This reversal may give some modules empty
set_pcpu or set_vnet sections, but these are harmless.

Changes reverted:

------------------------------------------------------------------------
r215318 | dim | 2010-11-14 21:40:55 +0100 (Sun, 14 Nov 2010) | 4 lines

Instead of unconditionally emitting .globl's for the __start_set_xxx and
__stop_set_xxx symbols, only emit them when the set_vnet or set_pcpu
sections are actually defined.

------------------------------------------------------------------------
r215317 | dim | 2010-11-14 21:38:11 +0100 (Sun, 14 Nov 2010) | 3 lines

Apply the STATIC_VNET_DEFINE and STATIC_DPCPU_DEFINE macros throughout
the tree.

------------------------------------------------------------------------
r215316 | dim | 2010-11-14 21:23:02 +0100 (Sun, 14 Nov 2010) | 2 lines

Add macros to define static instances of VNET_DEFINE and DPCPU_DEFINE.

Apply the STATIC_VNET_DEFINE and STATIC_DPCPU_DEFINE macros throughout
the tree.

Fix typo in the comment.

Update PowerPC event timer code to use new event timers infrastructure.

Reviewed by: nwitehorn
Tested by: andreast
H/W donated by: Gheorghe Ardelean

Remove the unneeded header <machine/intr.h>.

Remove debugging printf that snuck in here.

Pointy hat to: me

Add some more paranoia to setting HID registers, and update the AIM
clock routines to work better with SMP. This makes SMP work fully and
stably on an Xserve G5.

Obtained from: Book-E (clock bits)

PowerPC common SMP startup and time base rework.

- make mftb() shared, rewrite in C, provide complementary mttb()
- adjust SMP startup per the above, additional comments, minor naming
changes
- eliminate redundant TB defines, other minor cosmetics

Reviewed by: marcel, nwhitehorn
Obtained from: Freescale, Semihalf

Factor out platform dependent things unrelated to device drivers into a
new platform module. These are probed in early boot, and have the
responsibility of determining the layout of physical memory, determining
the CPU timebase frequency, and handling the zoo of SMP mechanisms
found on PowerPC.

Reviewed by: marcel, raj
Book-E parts by: raj

o In decr_get_timecount() only read the low timebase register.
We're only returning a 32-bit counter.
o In decr_intr(), manually perform LICM, so that we don't test
a loop invariant condition inside a loop.
o Include <machine/smp.h>

Don't clear PSL_RI. Disabling external interrupts
doesn't make exceptions unrecoverable.

MFp4: SMP support

Now that all platforms use genclock, shuffle things around slightly
for better structure.

Much of this is related to <sys/clock.h>, which should really have
been called <sys/calendar.h>, but unless and until we need the name,
the repocopy can wait.

In general the kernel does not know about minutes, hours, days,
timezones, daylight savings time, leap-years and such. All that
is theoretically a matter for userland only.

Parts of kernel code does however care: badly designed filesystems
store timestamps in local time and RTC chips almost universally
track time in a YY-MM-DD HH:MM:SS format, and sometimes in local
timezone instead of UTC. For this we have <sys/clock.h>

<sys/time.h> on the other hand, deals with time_t, timeval, timespec
and so on. These know only seconds and fractions thereof.

Move inittodr() and resettodr() prototypes to <sys/time.h>.
Retain the names as it is one of the few surviving PDP/VAX references.

Move startrtclock() to <machine/clock.h> on relevant platforms, it
is a MD call between machdep.c/clock.c. Remove references to it
elsewhere.

Remove a lot of unnecessary <sys/clock.h> includes.

Move the machdep.disable_rtc_set sysctl to subr_rtc.c where it belongs.
XXX: should be kern.disable_rtc_set really, it's not MD.

Switch to using genclock. Have nexus double as clock device for
now. While here, add a proper attach() method to nexus.

Requested by: phk

The "free-lance" timer in the i8254 is only used for the speaker
these days, so de-generalize the acquire_timer/release_timer api
to just deal with speakers.

The new (optional) MD functions are:
timer_spkr_acquire()
timer_spkr_release()
and
timer_spkr_setfreq()

the last of which configures the timer to generate a tone of a given
frequency, in Hz instead of 1/1193182th of seconds.

Drop entirely timer2 on pc98, it is not used anywhere at all.

Move sysbeep() to kern/tty_cons.c and use the timer_spkr*() if
they exist, and do nothing otherwise.

Remove prototypes and empty acquire-/release-timer() and sysbeep()
functions from the non-beeping archs.

This eliminate the need for the speaker driver to know about
i8254frequency at all. In theory this makes the speaker driver MI,
contingent on the timer_spkr_*() functions existing but the driver
does not know this yet and still attaches to the ISA bus.

Syscons is more tricky, in one function, sc_tone(), it knows the hz
and things are just fine.

In the other function, sc_bell() it seems to get the period from
the KDMKTONE ioctl in terms if 1/1193182th second, so we hardcode
the 1193182 and leave it at that. It's probably not important.

Change a few other sysbeep() uses which obviously knew that the
argument was in terms of i8254 frequency, and leave alone those
that look like people thought sysbeep() took frequency in hertz.

This eliminates the knowledge of i8254_freq from all but the actual
clock.c code and the prof_machdep.c on amd64 and i386, where I think
it would be smart to ask for help from the timecounters anyway [TBD].

Forced commit to record that this file was repocopied from
src/sys/powerpc/powerpc and modified for its new location.

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().

Forced commit after problems with previous commit.

Enable decrementer exceptions and set up a timecounter.

With this commit I can now (with KTR enabled) see the system attempting to
schedule clock swi's.

Fix comment breakage.

Bring in NetBSD code used in the PowerPC port.

Reviewed by: obrien, dfr
Obtained from: NetBSD