kernel: Remove numerous #include <sys/thread2.h>.

Most of them were added when we converted spl*() calls to
crit_enter()/crit_exit(), almost 14 years ago. We can now
remove a good chunk of them agai

kernel: Remove numerous #include <sys/thread2.h>.

Most of them were added when we converted spl*() calls to
crit_enter()/crit_exit(), almost 14 years ago. We can now
remove a good chunk of them again for where crit_*() are
no longer used.

I had to adjust some files that were relying on thread2.h
or headers that it includes coming in via other headers
that it was removed from.

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kernel - Refactor machdep.cpu_idle_hlt

* Refactor machdep.cpu_idle_hlt. Operation works essentially the
same way as before but the code is a lot easier to read.

* Refactor mode 3 to have ACPI ca

kernel - Refactor machdep.cpu_idle_hlt

* Refactor machdep.cpu_idle_hlt. Operation works essentially the
same way as before but the code is a lot easier to read.

* Refactor mode 3 to have ACPI call back into machdep when entering
a C1 halt. Continue using HLT for this situation as we aren't
really sure what ACPI may or may not have done. MONITOR/MWAIT
might not be appropriate.

* Fix bug in cpu_smp_stopped(). Just because cpu_mwait_hints is
non-zero does not mean that there is an index entry for CPU_MWAIT_C1.
Use the last entry based on cpu_mwait_hints instead.

* Note that machdep.cpu_idle_hlt mode 2 still doesn't work as intended.

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acpi - Use KOBJ_GPRI_ACPI driver priorities for ig4 and gpio_intel.

* Since we currently don't handle the ACPI _DEP methods appropriately,
use the "global priority hack" from
5025fc65cd2448de8a5

acpi - Use KOBJ_GPRI_ACPI driver priorities for ig4 and gpio_intel.

* Since we currently don't handle the ACPI _DEP methods appropriately,
use the "global priority hack" from
5025fc65cd2448de8a5b7295c9936b473a7b0194 to enforce that ig4 and
gpio_intel attach before various ACPI namespace devices.

* This uses the KOBJ_GPRI_ACPI+1 and KOBJ_GPRI_ACPI+2 driver global priority
levels for important ACPI drivers, which may have to attach before other
ACPI devices can be used.

* This also adds the KOBJ_GPRI_ACPI global priority level to the sdhci_acpi
driver declaration.

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kernel - Add a global priority hack for ACPI

* Allows ACPI to fully probe and attach all acpi devices before
attaching any non-ACPI devices.

* May improve device attach stability.

* Currently on

kernel - Add a global priority hack for ACPI

* Allows ACPI to fully probe and attach all acpi devices before
attaching any non-ACPI devices.

* May improve device attach stability.

* Currently only implemented at the top-level of the acpi
device tree.

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kern: Add per-cpu helper threads, which handles lwkt messages.

They will be used to avoid netisr abusing.

acpi/cstate: Allow forcing busmastering status and arbitration for C3

Revert "acpi/cstate: Detect and fix duplicated C-states"

This reverts commit 4221f7280cb32cbd2292001d52653e01a71872c9.

Looks like it is intentional to avoid bus mastering register
accessing, cache

Revert "acpi/cstate: Detect and fix duplicated C-states"

This reverts commit 4221f7280cb32cbd2292001d52653e01a71872c9.

Looks like it is intentional to avoid bus mastering register
accessing, cache flush, and changing interrupt timer, which
is required for C3.

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acpi/cstate: Match C-states of the hyperthreads on the same core

Some stupid BIOSes set different C-states for hyperthreads on the same
core, which prevents the core from entering deep C-states, sin

acpi/cstate: Match C-states of the hyperthreads on the same core

Some stupid BIOSes set different C-states for hyperthreads on the same
core, which prevents the core from entering deep C-states, since not
all hyperthreads of the core are in the deep C-states.

We fix this by using same number of C-states for hyperthreads on the
same core; the hyperthread w/ more C-states is taken as master.

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acpi/cstate: Clear saved C-state softc, if attach failed

And install softc during the probe; instead of using (void *)1.

acpi/cstate: Detect and fix duplicated C-states

Some buggy BIOSes create two C2 states, however, the latter one is
obviously C3. Add tunable hw.acpi.cpu.cst.check_duplicated to detect
and fix this

acpi/cstate: Detect and fix duplicated C-states

Some buggy BIOSes create two C2 states, however, the latter one is
obviously C3. Add tunable hw.acpi.cpu.cst.check_duplicated to detect
and fix this bug; it is not enabled by default.

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kernel: Refer to it as "ACPICA", not "ACPI CA" or "ACPI-CA".

acpi/cstate: Remove unnecessary bus_generic_{attach,probe}()

They were inheritted when acpi_cpu_cstate.c was splitted from acpi_cpu.c.
C-state is a leaf device, nothing will be its children.

cputimer/intr: Move powersaving intr cputimer switching to kern_cputimer.c

While I'm here fix several bugs:
- Don't take ERESTART as error
- Use serializer to protect the number of power saving requ

cputimer/intr: Move powersaving intr cputimer switching to kern_cputimer.c

While I'm here fix several bugs:
- Don't take ERESTART as error
- Use serializer to protect the number of power saving request. Using
atomic_fetchadd_int is not enough here:
The first power saving request could fail. However, before its failure,
other power saving request could be successful, since the intr cputimer
switch is skipped.

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acpi/cpu: Remove the cpux naming hack

Used to avoid name conflict between C-state module and cpu module

acpi/cstate/x86_64: Implement native C-state support for Intel CPUs

The native C-state on Intel CPUs is entered using monitor/mwait w/ the
help from mwait hint (eax) and extension (ecx, break upon i

acpi/cstate/x86_64: Implement native C-state support for Intel CPUs

The native C-state on Intel CPUs is entered using monitor/mwait w/ the
help from mwait hint (eax) and extension (ecx, break upon interrupt).

We still need to keep an eye on native C1 state. Currently C1 state
only uses "sti;halt".

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acpi/cstate: Allow fixed hardware GAS for C1, which means "sti;halt"

Add comment we still need to filter Intel's "C1 I/O then halt". It
probably won't be problem, since the related bit is not set i

acpi/cstate: Allow fixed hardware GAS for C1, which means "sti;halt"

Add comment we still need to filter Intel's "C1 I/O then halt". It
probably won't be problem, since the related bit is not set in _OSC
or _PDC.

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acpi/cstate: Fix resource leakage

acpi/cstate: Use boolean_t for acpi_cst_disable_idle

acpi/cstate: Rework preamble operation for entering C-state

- Save preamble operation in C-state struct, instead of choosing
preamble operation at run time
- Add machine depend C-state setup code

acpi/cstate: Rework preamble operation for entering C-state

- Save preamble operation in C-state struct, instead of choosing
preamble operation at run time
- Add machine depend C-state setup code to optimize out certain
preamble operation for various CPU vendors
- Fix up generic preamble operation setup according to ACPI spec

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acpi/cstate: Add a method to per C-state softc to enter the C-state

This will be used to add "native" C-state support

acpi/cstate: Make sure that idle hook is installed as the last step

acpi/cstate: If there is bus master activity pick up non-C3 is enough

Since bus master activity is only checked before entering C3+ states.

acpi/cstate: Rearrange _CST reprobe code path

acpi/cstate: Save ACPI_GENERIC_ADDRESS for later use

Also fix a bug that 'res_type' should be used instead of 'type' during
FADT C state resource allocation.

acpi/cstate: Function/variable/macro renaming

Adjust some comment. No functional changes.