The MSR EFER state is not saved and restored when sleeping on i386. On PAE,
the CPU crashes right after waking up, since it needs to access NOX-ed
pages, which are to be enabled in an MSR.

Fix this by properly saving and restoring the EFER MSR. It's a little
tricky since the wakeup code uses %edx, but rdmsr overwrites it. We just
save it in %esi.

Now, the CPU sleeps properly on PAE kernels.

KNF, and reduce the diff between amd64 and i386.

branches: 1.16.6; 1.16.10;
Minor fpu initialisation cleanups:
Set default CR) so that the FPU is enabled (unset CR0_EM) and initialise
i386_fpu_present to 1.
No need to call the npx trap indirectly, rename to fpunda() to match amd64.
Remove the i386_fpu_exception variable and sysctl (It used to indicate
which irq was used for fpu exceptions, but we only support 'internal'
now). Hopefully no one cares.
fpuinit() now only needs to clear TS before the fninit(). Apart from the
checks for 486SX and the 'fdiv bug' this matches the amd64 version.
Exclude fpuinit() from XEN kernels, they don't call it - which rather begs
the question as to whether it is needed at all!

branches: 1.15.2; 1.15.4;
Set the CR0_AM bit so processes can enable alignment check errors under
x86 through PSL_AC bit.

ATF test incoming shortly.

branches: 1.14.12; 1.14.16; 1.14.18;
Ensure that the VBE mode is only restored when machdep.acpi_vbios_reset=1

Pass the VBE mode number from the bootloader to the kernel, and then
make the ACPI wakecode aware of it. Restore the desired VBE mode on resume
when acpi_vbios_reset=1, so suspend/resume with genfb console will work.

branches: 1.12.14;
Remove clause 3 and 4 from TNF licenses

branches: 1.11.6; 1.11.8; 1.11.10;
Add new IPI for saving CPU state explicitly, share high-level part of
ACPI wakeup code and teach it how to start the APs again. As a side
effect the CPU_START interface allows choosing between different
bootstrap codes more easily now.

branches: 1.10.2;
Merge jmcneill-pm branch.

branches: 1.9.10; 1.9.12; 1.9.20; 1.9.22;
Make the beep on resume optional. It gets controlled by
machdep.acpi_beep_on_reset.

branches: 1.8.10; 1.8.14; 1.8.16;
Make resetting the video BIOS in the ACPI wakecode optional. It can be
configured via sysctl machdep.acpi_vbios_reset. Defaults to 1 -- reset vbios
on resume.

More ACPI wakecode changes:
* Enable VBIOS hack by default
* Beep while calling VBIOS, for debugging.
* Fix a DIAGNOSTIC error in the sleep path.
* Remove the erroneous mutex not locked error message.

Do not restore task registers in wakecode.

branches: 1.5.4; 1.5.8; 1.5.14; 1.5.16;
merge ktrace-lwp.

branches: 1.4.6;
Fixup ACPI wakecode on i386. This (along with some PCI power management
hooks) allows my Latitude D600 to recover from S3 sleep.

acpi_wakeup.c changes from lha@:
http://people.su.se/~lha/patches/netbsd/acpi-wakeup-1

branches: 1.3.4; 1.3.6;
whitespace nit

Use predefined macro rather than hardcoded value.

branches: 1.1.2; 1.1.4; 1.1.6; 1.1.8; 1.1.14;
ACPI wake-up code for i386. but, we have no interface to use it efficiently.