|author||Kyösti Mälkki <firstname.lastname@example.org>||Mon Nov 25 20:03:27 2019 +0200|
|committer||Patrick Georgi <email@example.com>||Mon Dec 02 12:08:40 2019 +0000|
soc/amd/common: Inline ACPI MMIO accessors The overhead of pushing variables to stack exceeded the number of instructions the actual MMIO operation took and the build of google/aleena with inlined accessors turned out to be just slightly (<2 KiB) smaller for the entire romstage or ramstage. Simple read-modify-write MMIO cycles should optimise better now. IO cycles with index/data register are borderline, at first sight assembly looked better by not inlining them. Change-Id: If2c37c9886a0151183aa6dd80eb068d6c67b3848 Signed-off-by: Kyösti Mälkki <firstname.lastname@example.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37211 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.