AcpiPlatform

Index: 0318 | Size: 117.6 KB | Phase: DXE | Arch: X64

Overview

ACPI platform driver that constructs and installs the ACPI tables for the Purley platform. Builds platform policy from setup variables, CPUID, and MSR values, then dispatches table-specific patching based on 4-byte ACPI table signatures. Handles VT-d (DMA remapping with 24 DRHD entries), SRAT (NUMA proximity domains for 2S/4S/8S topologies), SLIT (system locality distances), APIC (LAPIC/I/O APIC/ISO/NMI entries), NFIT (NVDIMM firmware interface table), and SSDT generation.

Key Functions

• PlatformHooksInit, SetAcpiMode, InstallAcpiTables, InstallNfitAcpiTable: Main ACPI installation pipeline
• PlatformUpdateTables: Notification event that patches installed tables based on platform configuration
• AcpiPlatformTableFilter: Filters tables by signature, dispatches to signature-specific patchers (DSDT, SSDT, SRAT, SLIT, APIC, NFIT, DMAR, etc.)
• SetupPlatformPolicy, CheckCsmEnabled: Reads setup variables and platform configuration to determine ACPI table content
• GetApicCoreMap, InitializeApicProcessorMap: Builds processor topology tables for LAPIC entries

Protocols/Dependencies

• AcpiPlatformProtocol, SystemConfigProtocol, CpuConfigProtocol
• AMI ACPI Library Protocol (for NFIT patching)
• PCI Root Bridge (LocatePciRootBridge), USRA protocol
• VT-d (DMAR with 24 DRHD entries, 4 sockets x 6 cores), NUMA/SRAT/SLIT, NVDIMM/NFIT

Platform

Intel Purley platform (PurleyPlatPkg/Acpi/AcpiPlatform), Lenovo HR650X. Supports CSM/compatibility mode detection and multi-socket topologies.