PcdPeim

Index: 0406 | Size: 12,224 bytes | Phase: PEI | Format: PE32 (Ia32)

Overview

Platform Configuration Database (PCD) PEIM that initializes and serves the PEI-phase PCD database. Provides the full PCD PPI interface: Get/Set operations for 8/16/32/64-bit, pointer, and size variants, supporting both token-number and token-space-GUID (Ex) access patterns, SKU management, and callback registration for PCD value change notifications.

Key Functions

• PcdPeimEntryPoint -- Module entry: calls PeiPcdInit, installs PCD PPI, asserts on failure
• PeiPcdInit -- PCD database initialization from firmware volume HOB
• PeiPcdGet8/16/32/64/Ptr/Size -- Token-number-based PCD getters
• PeiPcdSet8/16/32/64/Ptr -- Token-number-based PCD setters (via PeiPcdSetTokenValue)
• PeiPcdGet8Ex/16Ex/32Ex/64Ex/PtrEx/SizeEx -- GUID+token-number extended PCD getters
• PeiPcdSet8Ex/16Ex/32Ex/64Ex/PtrEx -- Extended PCD setters (via PeiPcdSetExTokenValue)
• PeiPcdSetSku -- SKU switching with validation and one-change enforcement
• PeiPcdGetNextTokenSpace -- Token-space GUID enumeration
• PeiPcdSetCallback / PeiPcdNotifySet -- Callback registration for PCD change notifications
• PeiPcdGetInfo -- Metadata retrieval (token type/size)
• PeiPcdGetTokenValue / PeiPcdSetTokenValue -- Internal PCD database access layer
• PeiPcdGetPcdDb / PeiPcdGetSkuSize -- Database pointer and SKU-size resolution
• PeiPcdSetCallbackWorker -- Shared callback registration worker
• DebugGetDebugLib / DebugPrint -- Debug output services

Dependencies

• EFI_PEI_PCD_PPI -- PCD PPI interface
• EFI_PEI_PCD_PPI_GUID -- PCD service GUID
• PCD database HOB (from firmware volume)
• PEI Services table (PPI install/locate)
• Debug Library PPI

Platform

Intel Purley (Skylake-SP Xeon), HR650X
Source: MdeModulePkg/Universal/PCD/Pei/Pcd.c