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

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

Fill out fake preload structure to let userland tools like pmc(3) know
about kernel module base address and actual size

Don't build kernel.tramp on Octeon. Probably building it should be opt-in
not opt-out, but I don't know enough about which ports need it to get the
defaults right.

FDT support for MIPS.

Add architecture specific files needed to compile MIPS with
flattened device tree support.

Support compiling MIPS elf trampoline with a different ABI.

Allow changing the trampoline ABI with makeoptions, this will allow
us to have a trampoline with a different ABI from the kernel.
Useful in cases where we have to boot a 64 bit kernel from a
bootloader which supports only 32 bit or vice versa.

Approved by: bz(re), jmallett, imp

Remove unnecessary 'cat'.

Minor cleanup for sys/conf/Makefile.mips. Use -e and replace two calls to
sed with one.

Make the ELF trampoline binary ELF executable (and do some cleanup).

- Remove the -shared flag for the trampoline binary, generate an
ELF executable instead of a shared object.
- No need to generate tmphack.S, move the code to sys/mips/mips/inckern.S
- No need generate opt_kernname.h, KERNNAME can be passed with -D

Reviewed by: gonzo, imp

Complete the integration of tbemd branch into head.

TARGET_BIG_ENDIAN is now completely dead, except where it was
originally supposed to be used (internally in the toolchain building).

TARGET_ARCH has changed in three cases:
(1) Little endian mips has changed to mipsel.
(2) Big endian mips has changed to mipseb.
(3) Big endian arm has changed to armeb.

Some additional changes are needed to make 'make universe' work on arm
and mips after this change, so those are commented out for now.

UPDATING information will be forthcoming. Any remaining rough edges
will be hammered out in -current.

TARGET_64BIT isn't needed anymore, GC it (partial merge from tbemd).

Merge r187428, r191079, r195533, r195669, r197004, r197012 and r197015
from projects/mips to head by hand:

r197015 | imp | 2009-09-08 21:59:46 -0600 (Tue, 08 Sep 2009) | 2 lines
Prefer PTR_LA over a naked la to work with 64-bits..

r197012 | imp | 2009-09-08 21:46:04 -0600 (Tue, 08 Sep 2009) | 3 lines
Use proper set of flags to build the tramp. this gets 64-bit almost
building and lets me debug the 'almost' :)

r197004 | imp | 2009-09-08 18:47:12 -0600 (Tue, 08 Sep 2009) | 2 lines
Use ${LDSCRIPT_NAME} in preference to ldscript.$M.

r195669 | gonzo | 2009-07-13 17:03:44 -0600 (Mon, 13 Jul 2009) | 3 lines
- Remove -mno-dsp from CFLAGS. MIPS DSP ASE is off by default
now (as it should be)

r195533 | imp | 2009-07-10 01:21:26 -0600 (Fri, 10 Jul 2009) | 4 lines
Add in the emulation selection when linking... We're still not 100%
of the way there, but we're better with it. hack.so build now, but
we die when we try to link it in.

r191079 | gonzo | 2009-04-14 16:53:22 -0600 (Tue, 14 Apr 2009) | 2 lines
- Revert changes accidentally killed by merge operation

r187418 | gonzo | 2009-01-18 19:37:10 -0700 (Sun, 18 Jan 2009) | 4 lines
- Add trampoline stuff for bootloaders that do not support ELF
- Replace arm'ish KERNPHYSADDR/KERNVIRTADDR with
KERNLOADADDR/TRAMPLOADADDR and clean configs

Merge in the mips specific configuration files and such from the
merged juniper and mips2 code base. This represents the work of
Juniper Engineers, plus Oleksandr Tymoshenko, Wojciech Koszek, Warner
Losh, Olivier Houchard, Randall Stewert and others that have
contributed to the mips2 and/or mips2-jnpr perforce branches.