This series adds the basic ACPI support for the RISC-V virt machine. 
Currently only RINTC interrupt controller specification is approved by the
UEFI forum. External interrupt controller support in ACPI is in progress.

The basic infrastructure changes are mostly leveraged from ARM.

This adds support for RINTC and RHCT tables as specified in below ECR links
which are approved by UEFI forum.
RINTC - https://drive.google.com/file/d/1R6k4MshhN3WTT-hwqAquu5nX6xSEqK2l/view
RHCT - https://drive.google.com/file/d/1nP3nFiH4jkPMp6COOxP6123DCZKR-tia/view

These changes are also available @
https://github.com/vlsunil/qemu/tree/acpi_b1_us_review_V4

Changes since V3:
	1) Added back acpi_align_size() wrapper as per Drew's feedback
	2) Updated RB tags

Changes since V2:
	1) Squashed commits and updated commit message as per feedback from Daniel.
	2) Addressed comments from Drew.
	3) Updated tags.

Changes since V1:
	1) Addressed comments from Bin Meng.
	2) Made acpi switch default AUTO similar to other architectures.
	3) Re-based and added RB and ACKs.

The series is tested using SBI HVC console and initrd.

Test instructions:
1) Build Qemu with ACPI support (this series)

2) Build EDK2 as per instructions in
https://github.com/vlsunil/riscv-uefi-edk2-docs/wiki/RISC-V-Qemu-Virt-support

3) Build Linux with ACPI support using below branch
https://github.com/vlsunil/linux/commits/acpi_b1_us_review_ipi17_V2
after enabling SBI HVC and SBI earlycon options.

CONFIG_RISCV_SBI_V01=y
CONFIG_SERIAL_EARLYCON_RISCV_SBI=y
CONFIG_HVC_RISCV_SBI=y

4) Build buildroot.

Run with below command.
qemu-system-riscv64   -nographic \
-drive file=Build/RiscVVirtQemu/RELEASE_GCC5/FV/RISCV_VIRT.fd,if=pflash,format=raw,unit=1 \
-machine virt -smp 16 -m 2G \
-kernel arch/riscv/boot/Image \
-initrd buildroot/output/images/rootfs.cpio \
-append "root=/dev/ram ro console=hvc0 earlycon=sbi"


Sunil V L (8):
  hw/riscv/virt: Add OEM_ID and OEM_TABLE_ID fields
  hw/riscv/virt: Add a switch to disable ACPI
  hw/riscv/virt: Add memmap pointer to RiscVVirtState
  hw/riscv/virt: Enable basic ACPI infrastructure
  hw/riscv/virt: virt-acpi-build.c: Add RINTC in MADT
  hw/riscv/virt: virt-acpi-build.c: Add RHCT Table
  hw/riscv/virt.c: Initialize the ACPI tables
  MAINTAINERS: Add entry for RISC-V ACPI

 MAINTAINERS                |  18 +-
 hw/riscv/Kconfig           |   1 +
 hw/riscv/meson.build       |   1 +
 hw/riscv/virt-acpi-build.c | 396 +++++++++++++++++++++++++++++++++++++
 hw/riscv/virt.c            |  40 ++++
 include/hw/riscv/virt.h    |   6 +
 6 files changed, 456 insertions(+), 6 deletions(-)
 create mode 100644 hw/riscv/virt-acpi-build.c

-- 
2.34.1