117361278f
The patch implements ACPI CPPCv3 package. It implements and updates the
following methods:
generate_cppc_entries(): Updates method to support CPPCv3 package
acpi_get_cpu_nominal_freq(): Calculates CPU's nominal frequency
acpi_get_cpu_nomi_perf(): Calculates nominal performance for big and
small cores.
acpigen_write_CPPC_hybrid_method(): It generates ACPI code to implement
_CPC method.
acpigen_cppc_update_nominal_freq_perf(): It updates CPPC3 package if cpu
supports Nominal Frequency. It generates ACPI code which sets Nominal
Frequency and updates Nominal Performance. It uses below calculation to
update the Nominal Frequency and Nominal Performance:
Nominal Frequency = Max non-turbo ratio * cpu_bus_frequency
Nominal Performance = Max non-turn ratio * cpu scaling factor
CPU scaling factor varies in the hybrid core environment. So, the
generated ACPI code updates Nominal Performance based on the CPU's
scaling factor.
TEST=Verified CPPCv3 package is getting created in the SSDT table.
Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Signed-off-by: ravindr1 <ravindra@intel.com>
Change-Id: Icd5ea9e70bebd1e66d3cea2bcf8a6678e5cc95ca
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59359
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
coreboot README
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.
Payloads
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.
Supported Hardware
coreboot supports a wide range of chipsets, devices, and mainboards.
For details please consult:
Build Requirements
- make
- gcc / g++
Because Linux distribution compilers tend to use lots of patches. coreboot
does lots of "unusual" things in its build system, some of which break due
to those patches, sometimes by gcc aborting, sometimes - and that's worse -
by generating broken object code.
Two options: use our toolchain (eg. make crosstools-i386) or enable the
ANY_TOOLCHAINKconfig option if you're feeling lucky (no support in this case). - iasl (for targets with ACPI support)
- pkg-config
- libssl-dev (openssl)
Optional:
- doxygen (for generating/viewing documentation)
- gdb (for better debugging facilities on some targets)
- ncurses (for
make menuconfigandmake nconfig) - flex and bison (for regenerating parsers)
Building coreboot
Please consult https://www.coreboot.org/Build_HOWTO for details.
Testing coreboot Without Modifying Your Hardware
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.
Website and Mailing List
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:
https://www.coreboot.org/Mailinglist
Copyright and License
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.