[PATCH 0/3 -v4] x86_64 EFI runtime service support

[Huang, Ying]

Following sets of patches add EFI/UEFI (Unified Extensible Firmware
Interface) runtime services support to x86_64 architecture. The
patches have been tested against 2.6.24-rc1 kernel on Intel platforms
with EFI1.10 and UEFI2.0 firmware.


v4:

- EFI boot parameters are extended for 64-bit EFI in a 32-bit EFI
  compatible way.

- Add EFI runtime services document.

v3:

- Remove E820_RUNTIME_CODE, the EFI memory map is used to deal with
  EFI runtime code area.

- The method used to make EFI runtime code area executable is change:

  a. Before page allocation is usable, the PMD of direct mapping is
     changed temporarily before and after each EFI call.

  b. After page allocation is usable, change_page_attr_addr is used to
     change corresponding page attribute.

- Use fixmap to map EFI memory mapped IO memory area to make kexec
  workable.

- Add a kernel command line option "noefi" to make it possible to turn
  off EFI runtime services support.

- Function pointers are used for EFI time runtime service.

- EFI reboot runtime service is embedded into the framework of
  reboot_type.

- A kernel command line option "noefi_time" is added to make it
  possible to fall back to CMOS based implementation.

v2:

- The EFI callwrapper is re-implemented in assembler.


Best Regards,
Huang Ying
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