Allow linux to directly load another operating system.

#4 kexec.alpha
======================================================================
	- Add alpha kexec support

#3 kexec.x86
======================================================================
	- Add x86 kexec support

#2 kexec.generic
======================================================================
	- Add the kexec syscall
	  This just patch just adds the generic support.  Until the 
	  architecture specific code is added nothing useful can be 
	  done with it.

#1 kexec.reboot
======================================================================
	- Reset local apic to virtual wire compatibility mode on reboot
	- Move apic initialization into the common reboot shutdown path
	- x86 SMP make certain we reboot with the bootstrap processor.
	- Remove horrible inconsistent cludge that didn't know 
	  which cpu it was rebooting on.