Add a bunch of headers to include/asm-um to support x86_64.
Also move some arch-specific things from generic files to x86-specific ones.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>