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x86_64 EFI runtime service support

Huang, Ying lkml 1 version In review

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  1. v1 Latest3 patches 31 repliesIn review

v4 from the cover letter

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

- Add EFI runtime services document.

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/3x86_64 EFI runtime service support: EFI basic runtime service supportarch/x86/kernel/Makefile_64 arch/x86/kernel/efi_64.c arch/x86/kernel/efi_callwrap_64.S +6 more+735 -331 replies
2/3x86_64 EFI runtime service support: EFI runtime servicesarch/x86/kernel/reboot_64.c arch/x86/kernel/time_64.c include/asm-x86/emergency-restart.h +1 more+60 -220 replies
3/3x86_64 EFI runtime service support: document for EFI runtime servicesDocumentation/x86_64/boot-options.txt Documentation/x86_64/uefi.txt+21 -10 replies

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

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

Read the cover letter in its thread