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Enable ACPI core for RISC-V after adding architecture-specific interfaces and header files required to build the ACPI core. 1) Couple of header files are required unconditionally by the ACPI core. Add empty acenv.h and cpu.h header files. 2) If CONFIG_PCI is enabled, a few PCI related interfaces need to be provided by the architecture. Define dummy interfaces for now so that build succeeds. Actual implementation will be added when PCI support is added for ACPI along with external interrupt controller support. 3) A few globals and memory mapping related functions specific to the architecture need to be provided. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> Link: https://lore.kernel.org/r/20230515054928.2079268-7-sunilvl@ventanamicro.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.