Merge the bouyer-xenpvh branch, bringing in Xen PV drivers support under HVM
guests in GENERIC.
Xen support can be disabled at runtime with
boot -c
disable hypervisor

Get TSC frequency from CPUID 0x15 and/or x16 for newer Intel processors.

- If the max CPUID leaf is >= 0x15, take TSC value from CPUID. Some processors
can take TSC/core crystal clock ratio but

Get TSC frequency from CPUID 0x15 and/or x16 for newer Intel processors.

- If the max CPUID leaf is >= 0x15, take TSC value from CPUID. Some processors
can take TSC/core crystal clock ratio but core crystal clock frequency
can't be taken. Intel SDM give us the values for some processors.
- It also required to change lapic_per_second to make LAPIC timer correctly.
- Add new file x86/x86/identcpu_subr.c to share common subroutines between
kernel and userland. Some code in x86/x86/identcpu.c and cpuctl/arch/i386.c
will be moved to this file in future.
- Add comment to clarify.

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- Dump LAPIC and I/O APIC correctly.
- Don't print redirect target on LAPIC.
- Fix DEST_MASK:
- DEST_MASK is not 1 bit but 2 bit.
- Add missing "\0"s to print decoded name correctly.
-

- Dump LAPIC and I/O APIC correctly.
- Don't print redirect target on LAPIC.
- Fix DEST_MASK:
- DEST_MASK is not 1 bit but 2 bit.
- Add missing "\0"s to print decoded name correctly.
- Support both LAPIC and I/O APIC correctly in apic_format_redir().
- Improve output of some bits using with snprintb()'s "F\B\1" and ":\V".

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Remove clause 3 and 4 from TNF licenses

clean up how cpus and ioapics are attached at the mainbus:
Seperate "cpubus" and "ioapicbus" -- while they share a common "address
space" (the apic id), the kernel doesn't use this fact. There are di

clean up how cpus and ioapics are attached at the mainbus:
Seperate "cpubus" and "ioapicbus" -- while they share a common "address
space" (the apic id), the kernel doesn't use this fact. There are different
data passed to cpus and apics, which caused some ugly polymorphism. This
also saves the special "submatch" functions needed to distingush cpus
and ioapics for autoconf. (And it makes that "apid" locators wired
in the kernel configuration are honored now; this allows one to dumb down
an mp box to singleprocessor by userconfig.)
Print "apid" locators in the buses "print" function "as everyone does",
so the per-port cpu drivers don't need to do it.
Being here, constify "struct cpu_functions" and g/c the unused MP_PICMODE
flag.

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Sprinkle const.

Nuke __P().

Move some files out of i386 into x86, so that they can be shared with
other ports.