Skip to content

Latest commit

 

History

History
98 lines (85 loc) · 4.25 KB

riscv-acpi-platform-req.adoc

File metadata and controls

98 lines (85 loc) · 4.25 KB

RISC-V ACPI Platform Requirements Specification

Copyright and license information

© 2021 Sunil V L <[email protected]>

It is licensed under the Creative Commons Attribution 4.0 International License (CC-BY 4.0). The full license text is available at https://creativecommons.org/licenses/by/4.0/.

Change Log

Version Draft-20210812

  • Initial version

1. Introduction

RISC-V server class platforms need to support Advanced Configuration and Power Interface (ACPI) as the hardware discovery and configuration mechanism. This document describes the mandatory ACPI tables and objects for RISC-V server platforms. All other ACPI tables not mentioned in this document can be implemented as needed adhering to the ACPI specification.

2. ACPI Namespace

In ACPI namespace, processors are required to be defined under the System Bus (\_SB) name space.

3. ACPI System Description Tables

The required ACPI System Description Tables, Device Objects and Methods are listed below.

Table 1. Required ACPI System Description Tables
ACPI Table ACPI Section Note

Root System Description Pointer (RSDP)

5.2.5

Extended System Description Table (XSDT)

5.2.8

Fixed ACPI Description Table (FADT)

5.2.9

Differentiated System Description Table (DSDT)

5.2.11.1

Multiple APIC Description Table (MADT)

5.2.12

RISC-V Timer Description Table

timebase-frequency

Processor Properties Topology Table (PPTT)

5.2.29

CPU and Cache topology information

Memory-mapped Configuration space (MCFG)

See Links to ACPI-Related Documents (http://uefi.org/acpi) under the heading "PCI Sig”

Required for PCIe support

Debug Port Table 2 (DBG2)

See Links to ACPI-Related Documents (http://uefi.org/acpi) under the heading “Debug Port Table 2”

Serial Port Console Redirection (SPCR)

See Links to ACPI-Related Documents (http://uefi.org/acpi) under the heading “Serial Port Console Redirection Table”

System Resource Affinity Table (SRAT)

5.2.16

Required if the platform supports NUMA

System Locality Information Table (SLIT)

5.2.17

Required if the platform supports NUMA

Boot Error Record Table (BERT)

18.3.1

RAS APEI

Error Injection Table (EINJ)

18.6.1

RAS APEI

Error Record Serialization Table (ERST)

18.5

RAS APEI

Hardware Error Source Table (HEST)

18.3.2

RAS APEI

4. ACPI Device Objects and Methods

Table 2. Required Device Objects and Methods
Object/Method ACPI Section Note

_AEI

5.6.5.2

Required for GPIO-signalled events

_EVT

5.6.5.3

Required for interrupt-signalled events

_ADR

6.1.1

Required for PCI

_HID

6.1.5

_UID

6.1.12

_CRS

6.2.2

_CCA

6.2.17

Required for DMA capable devices

_STA

6.3.7/7.2.4

Device status