Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Divine the array size by using 'nitems(array)' instead of using magic numbers.

Suggested by: Garrett Cooper

The MPtable specification allows for an 8-bit "BUS ID" and "I/O APIC ID".

Since the 'busses[]' and 'apics[]' arrays are indexed by these 8-bit IDs
make sure that they have enough space to accomodate up to 256 entries.

Submitted by: Ravi Shamanna
Obtained from: NetApp

Add an missing argument to open(2). If O_CREAT flag is specified,
file permission has to be specified as well.

Mark all global variables static for mptable(1).

While there, remove basetableEntryTypes, which became unused in r71209.

Fix a typo.

Submitted by: Jakub Lach jakub_lach of mailplus pl

Remove the useless "version" number output.
We don't give a version number each userland binary.

Make this build and work on amd64 (sledge at least).

Don't need to redundantly redeclare optreset.

Deal with table parsing bugs caused by out-of-order record entries.
Complain about out-of-order entries. This fixes the 'mp extended
table HOSED!" report on the DL360 we have here with the "fixed" compaq
bios rom to fix the table length off-by-one error.

Add `_PATH_DEVZERO'.
Use _PATH_* where where possible.

Stop printing out the Nfoo options help, since these tunables are about to
go away.

Remove 3 off by 128 errors.

$Id$ -> $FreeBSD$

getopt(3) returns -1 not EOF.

Don't #include implementation header <machine/types.h> directly.
#include <sys/types.h> before the headers that depend on it.

Use err(3). Add missing parameter for printf() (reviewed by steve).

Changed the Ints labels for the IO APIC from "INT#" to "PIN#" to better
reflect its logical usage. Ie., there is NOT a 1-to-1 correspondence
between IRQ numbers and APIC pin numbers as there is with the 8259 ICU.

Removed suggested "options AUTO_START", no longer used.

Noticed by: Vincent Poy <vince@mail.MCESTATE.COM>

Removed the SMP_TIMER_NC suggestion.
This is (almost) defunct, start to phase it out...

Removed SMP_PRIVPAGES from options list.
This functionality is now automatic.

Made 'options NINTR' greater of 24 and calculated value.
This coincides with changing kernel default to 64.

Document APIC_IO as mandatory.
Document SMP_AUTOSTART as working.

fixed minor typo, bumped to version 2.0.9

add a userland program for SMP support
mptable examines and displays the MP table of an SMP motherboard.