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Message-Id: <1196065417.14142.14.camel@caritas-dev.intel.com>
Date: Mon, 26 Nov 2007 16:23:37 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: akpm@...ux-foundation.org, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Andi Kleen <ak@...e.de>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Chandramouli Narayanan <mouli@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH -mm 0/4 -v6] x86_64 EFI runtime service support
Following patchset adds EFI/UEFI (Unified Extensible Firmware
Interface) runtime services support to x86_64 architecture.
The patchset have been tested against 2.6.24-rc3-mm1 kernel on Intel
platforms with 64-bit EFI1.10 and UEFI2.0 firmware. Because the
duplicated code between efi_32.c and efi_64.c is removed, the patchset
is also tested on Intel platform with 32-bit EFI firmware.
v6:
- Fix a bug about runtime service memory mapping.
- Rebase on 2.6.24-rc3-mm1
v5:
- Remove the duplicated code between efi_32.c and efi_64.c.
- Rename lin2win<x> to efi_call<x>.
- Make EFI time runtime service default to off.
- Use different bootloader signature for EFI32 and EFI64, so that
kernel can know whether underlaying EFI firmware is 64-bit or
32-bit.
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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