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Sunil V L <sunilvl@ventanamicro.com> says: This patch series enables the basic ACPI infrastructure for RISC-V. Supporting external interrupt controllers is in progress and hence it is tested using poll based HVC SBI console and RAM disk. The first patch in this series is one of the patch from Jisheng's series [1] which is not merged yet. This patch is required to support ACPI since efi_init() which gets called before sbi_init() can enable static branches and hits a panic. Below are two ECRs approved by ASWG. RINTC - https://drive.google.com/file/d/1R6k4MshhN3WTT-hwqAquu5nX6xSEqK2l/view RHCT - https://drive.google.com/file/d/1nP3nFiH4jkPMp6COOxP6123DCZKR-tia/view Testing: 1) Build latest Qemu 2) Build EDK2 as per instructions in https://github.com/vlsunil/riscv-uefi-edk2-docs/wiki/RISC-V-Qemu-Virt-support 3) Build Linux after enabling SBI HVC and SBI earlycon 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" * b4-shazam-merge: RISC-V: Enable ACPI in defconfig RISC-V: time.c: Add ACPI support for time_init() clocksource/timer-riscv: Add ACPI support clocksource/timer-riscv: Refactor riscv_timer_init_dt() irqchip/riscv-intc: Add ACPI support RISC-V: cpu: Enable cpuinfo for ACPI systems RISC-V: cpufeature: Add ACPI support in riscv_fill_hwcap() RISC-V: only iterate over possible CPUs in ISA string parser RISC-V: smpboot: Add ACPI support in setup_smp() RISC-V: smpboot: Create wrapper setup_smp() drivers/acpi: RISC-V: Add RHCT related code RISC-V: ACPI: Cache and retrieve the RINTC structure RISC-V: Add ACPI initialization in setup_arch() ACPI: processor_core: RISC-V: Enable mapping processor to the hartid RISC-V: Add support to build the ACPI core ACPI: OSL: Make should_use_kmap() 0 for RISC-V ACPI: tables: Print RINTC information when MADT is parsed crypto: hisilicon/qm: Fix to enable build with RISC-V clang platform/surface: Disable for RISC-V riscv: move sbi_init() earlier before jump_label_init() Link: https://lore.kernel.org/r/20230515054928.2079268-1-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.