Implement ACPI

[JohnAZoidberg]

@vlsunil has been working on implementing ACPI for RISC-V.

Branches:

• https://github.com/vlsunil/riscv-edk2/tree/virt_acpi
• https://github.com/vlsunil/riscv-edk2-platforms/tree/virt
• https://github.com/vlsunil/qemu/tree/virt-acpi

[JohnAZoidberg]

The commits don't have negative impact, so I picked them onto the WIP branches for RiscvVirt here:

• https://github.com/riscv/riscv-edk2/tree/riscv-virt-540-mod
• https://github.com/riscv/riscv-edk2-platforms/tree/riscv-virt-gh-actions

acpiview can be run but without the corresponding QEMU changes it does not show anything.

[vlsunil]

Thanks @JohnAZoidberg . Yes, qemu changes are required for it to display.

[vlsunil]

@vlsunil has been working on implementing ACPI for RISC-V.

Branches:

* https://github.com/vlsunil/riscv-edk2/tree/virt_acpi

* https://github.com/vlsunil/riscv-edk2-platforms/tree/virt

* https://github.com/vlsunil/qemu/tree/virt-acpi

The latest PoC code is available in the below branches.

• QEMU

  https://github.com/ventana-micro-systems/RISC-V-qemu/tree/acpi_v1_aia_v2

• Tianocore

  https://github.com/ventana-micro-systems/RISC-V-edk2-platforms/tree/acpi_v1_aia_v1 https://github.com/ventana-micro-systems/RISC-V-edk2/tree/acpi_v1_aia_v1

• Linux

  https://github.com/ventana-micro-systems/RISC-V-Linux/tree/acpi_v1_aia_v1

Linux boots with multiple CPUs. ACPI support is available with AIA interrupt controllers.

[JohnAZoidberg]

These branches are still the latest? Do they require any special configuration/build flags in qemu/edk2/linux?

I'd like to test it and possibly set up CI for it.

[vlsunil]

Hi Daniel, the instructions to build and test are documented at https://github.com/riscv-non-isa/riscv-acpi/wiki/PoC-:-How-to-build-and-test-ACPI-enabled-kernel.

based on LPC feedback, I am working on enabling a new ACPI table to communicate optional things etc which is still being defined and has a dependency on config discovery.