|author||Patrick Rudolph <firstname.lastname@example.org>||Sun Jul 05 08:46:55 2020 +0200|
|committer||Patrick Rudolph <email@example.com>||Fri Aug 21 16:01:42 2020 +0000|
arch/x86/gdt: Work around assembler bug The GDT loading did work fine on x86_64 a few months ago, but today it only works in QEMU, but not on real hardware or KVM-enabled QEMU. This might be related to toolchain changes. Use 64bit GDT loading on x86_64 and force the assembler to generate a 64bit address load on the GDT. This will make sure no 32bit (signed) displacement op is being generated, which points to the wrong address in longmode. Verified using readelf and made sure no R_X86_64_32S relocation symbol is emitted. Disassembled the romstage ELF and made sure the GDT address is 64bit in size. Tested on QEMU and KVM-enabled QEMU: Doesn't crash any more on KVM. Signed-off-by: Patrick Rudolph <firstname.lastname@example.org> Change-Id: Ia824f90d9611e6e8db09bd62a05e6f990581f09a Reviewed-on: https://review.coreboot.org/c/coreboot/+/43136 Tested-by: build bot (Jenkins) <email@example.com> Reviewed-by: Angel Pons <firstname.lastname@example.org>
coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload.
With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required.
coreboot was formerly known as LinuxBIOS.
After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot.
See https://www.coreboot.org/Payloads for a list of supported payloads.
coreboot supports a wide range of chipsets, devices, and mainboards.
For details please consult:
ANY_TOOLCHAINKconfig option if you're feeling lucky (no support in this case).
Please consult https://www.coreboot.org/Build_HOWTO for details.
If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU.
Please see https://www.coreboot.org/QEMU for details.
Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website:
You can contact us directly on the coreboot mailing list:
The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details.
coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details.
This makes the resulting coreboot images licensed under the GPL, version 2.