kexec jump support for x86_64

x86_64 specific support, including crash memory range and purgatory setup.
Corresponding kernel support has been merged already.

Together with the kexec jump features in Linux kernel, kexec jump can
be used for following:

- A simple hibernation implementation without ACPI support. You can
  kexec a hibernating kernel, save the memory image of original system
  and shutdown the system. When resuming, you restore the memory image
  of original system via ordinary kexec load then jump back.

- Kernel/system debug through making system snapshot. You can make
  system snapshot with kexec/kdump, jump back, do some thing and make
  another system snapshot.

- Cooperative multi-kernel/system. With kexec jump, you can switch
  between several kernels/systems quickly without boot process except
  the first time. This appears like swap a whole kernel/system out/in.

- A general method to call program in physical mode (paging turning
  off). This can be used to invoke BIOS code under Linux.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

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