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"UEFI EDK2 PCD规范解析：数据结构、协议、伪代码解读"

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The UEFI EDK2 PCD Spec, or Platform Configuration Database Specification, outlines a comprehensive infrastructure for managing platform configuration data in the UEFI environment. This specification is intended for developers and engineers working with UEFI firmware and related technologies, providing a detailed description of the PCD infrastructure and its components. The document starts with an introduction that defines the scope of the specification and identifies the target audience as developers and engineers working with UEFI firmware. It also includes related information and terms used throughout the document, as well as conventions for data structures, protocols, procedures, pseudo-code, and typography. The PCD Protocol is a key component of the infrastructure, allowing developers to set SKU (stock-keeping unit) values for platform configuration data. The PCD_PROTOCOL.SetSku() function is used to set SKU values, enabling customization and configuration of firmware settings based on specific hardware or software requirements. Overall, the UEFI EDK2 PCD Spec provides a detailed and standardized framework for managing platform configuration data in the UEFI environment. It is an essential resource for developers and engineers working with UEFI firmware and related technologies, ensuring consistency and compatibility in platform configuration across different hardware and software environments.

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1.4 Terms

EDK II Platform Conﬁguration Database Infrastructure Description[DRAFT]

DRAFT FOR REVIEW [06/11/2023 07:05:40]

Pseudo-code is presented to describe algorithms in a more concise

form. None of the algorithms in this document are intended to be

compiled directly. The code is presented at a level corresponding to the

surrounding text.

In describing variables, a

list

is an unordered collection of

homogeneous objects. A

queue

is an ordered list of homogeneous

objects. Unless otherwise noted, the ordering is assumed to be FIFO.

Pseudo-code is presented in a C-like format, using C conventions where

appropriate. The coding style, particularly the indentation style, is used

for readability and does not necessarily comply with an implementation

of the

EFI Speciﬁcation

1.5.5 Typographic Conventions

The following typographic conventions are used in this document to

illustrate programming concepts:

Code: This typeface is use to indicate code.

Argument: This typeface is used to indicate arguments.

1.4 Terms

EDK II Platform Conﬁguration Database Infrastructure Description[DRAFT]

DRAFT FOR REVIEW [06/11/2023 07:05:40]

2 PCD PROTOCOL

Summary

A platform database that contains a variety of current platform settings

or directives that can be accessed by a driver or application.

GUID

Protocol Interface Structure

typedef struct {

PCD_PROTOCOL_SET_SKU SetSku;

PCD_PROTOCOL_GET8 Get8;

PCD_PROTOCOL_GET16 Get16;

PCD_PROTOCOL_GET32 Get32;

PCD_PROTOCOL_GET64 Get64;

PCD_PROTOCOL_GET_POINTER GetPtr;

PCD_PROTOCOL_GET_BOOLEAN GetBool;

PCD_PROTOCOL_GET_SIZE GetSize;

PCD_PROTOCOL_GET_EX_8 Get8Ex;

PCD_PROTOCOL_GET_EX_16 Get16Ex;

PCD_PROTOCOL_GET_EX_32 Get32Ex;

PCD_PROTOCOL_GET_EX_64 Get64Ex;

PCD_PROTOCOL_GET_EX_POINTER GetPtrEx;

PCD_PROTOCOL_GET_EX_BOOLEAN GetBoolEx;

PCD_PROTOCOL_GET_EX_SIZE GetSizeEx;

PCD_PROTOCOL_SET8 Set8;

PCD_PROTOCOL_SET16 Set16;

PCD_PROTOCOL_SET32 Set32;

PCD_PROTOCOL_SET64 Set64;

PCD_PROTOCOL_SET_POINTER SetPtr;

PCD_PROTOCOL_SET_BOOLEAN SetBool;

PCD_PROTOCOL_SET_EX_8 Set8Ex;

PCD_PROTOCOL_SET_EX_16 Set16Ex;

PCD_PROTOCOL_SET_EX_32 Set32Ex;

PCD_PROTOCOL_SET_EX_64 Set64Ex;

PCD_PROTOCOL_SET_EX_POINTER SetPtrEx;

PCD_PROTOCOL_SET_EX_BOOLEAN SetBoolEx;

PCD_PROTOCOL_CALLBACK_ON_SET CallBackOnSet;

PCD_PROTOCOL_CANCEL_CALLBACK CancelCallBackOnSet;

PCD_PROTOCOL_GET_NEXT_TOKEN GetNextToken;

PCD_PROTOCOL_GET_NEXT_TOKENSPACE GetNextTokenSpace;

} PCD_PROTOCOL;

Parameters

#define PCD_PROTOCOL_GUID \

{ 0x11b34006, 0xd85b, 0x4d0a, { 0xa2, 0x90, 0xd5, 0xa5, 0x71, 0x31, 0xe, 0xf7

1.4 Terms

EDK II Platform Conﬁguration Database Infrastructure Description[DRAFT]

DRAFT FOR REVIEW [06/11/2023 07:05:40]

SetSku

Establish a current SKU value for the PCD service to use for subsequent

data Get/Set requests.

Get8

Retrieve an 8-bit value from the PCD service using the standard

platform namespace.

Get16

Retrieve a 16-bit value from the PCD service using the standard

platform namespace.

Get32

Retrieve a 32-bit value from the PCD service using the standard

platform namespace.

Get64

Retrieve a 64-bit value from the PCD service using the standard

platform namespace.

GetPtr

Retrieve a pointer to a value from the PCD service using the standard

platform namespace. Can be used to retrieve an array of bytes that

represent a data structure, ASCII string, or Unicode string

GetBool

Retrieve a Boolean value from the PCD service using the standard

platform namespace.

GetSize

Retrieve the size of a particular PCD Token value using the standard

platform namespace.

Get8Ex

Retrieve an 8-bit value from the PCD service using a GUIDed token

namespace.

Get16Ex

Retrieve a 16-bit value from the PCD service using a GUIDed token

namespace.

Get32Ex

Retrieve a 32-bit value from the PCD service using a GUIDed token

namespace.

Get64Ex

Retrieve a 64-bit value from the PCD service using a GUIDed token

namespace.

GetPtrEx

1.4 Terms

EDK II Platform Conﬁguration Database Infrastructure Description[DRAFT]

DRAFT FOR REVIEW [06/11/2023 07:05:40]

Retrieve a pointer to a value from the PCD service using a GUIDed

token namespace. Can be used to retrieve an array of bytes that may

represent a data structure, ASCII string, or Unicode string

GetBoolEx

Retrieve a Boolean value from the PCD service using a GUIDed token

namespace.

GetSizeEx

Retrieve the size of a particular PCD Token value using a GUIDed token

namespace.

Set8

Set an 8-bit value in the PCD service using the standard platform

namespace.

Set16

Set a 16-bit value in the PCD service using the standard platform

namespace.

Set32

Set a 32-bit value in the PCD service using the standard platform

namespace.

Set64

Set a 64-bit value in the PCD service using the standard platform

namespace.

SetPtr

Set a pointer to a value in the PCD service using the standard platform

namespace. Can be used to set an array of bytes that may represent a

data structure, ASCII string, or Unicode string

SetBool

Set a Boolean value in the PCD service using the standard platform

namespace.

Set8Ex

Set an 8-bit value in the PCD service using a GUIDed token namespace.

Set16Ex

Set a 16-bit value in the PCD service using a GUIDed token namespace.

Set32Ex

Set a 32-bit value in the PCD service using a GUIDed token namespace.

Set64Ex

Set a 64-bit value in the PCD service using a GUIDed token namespace.

SetPtrEx

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