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EFI Processor Subclass Specification v0.9

Intel® Platform Innovation Framework for EFI Processor subclass specification, version 0.9.

This specification defines the core code that is required for an implementation of the processor data hub subclass of the Intel® Platform Innovation Framework for EFI (hereafter referred to as the "framework"). This specification does the following:
• Describes the basic components of the processor data hub subclass and processor subclass data records
• Provides code definitions for type and record definitions for the processor subclass that are architecturally required by the Intel® Platform Innovation Framework for EFI Architecture Specification

This specification complies with the System Management BIOS (SMBIOS) reference specification, version 2.3.4.

Data structure descriptions

Intel® processors based on 32-bit Intel® architecture (IA-32) are “little endian” machines. This distinction means that the low-order byte of a multi-byte data item in memory is at the lowest address, while the high-order byte is at the highest address. Processors of the Intel® Itanium® processor family may be configured for both “little endian” and “big endian” operation. All implementations designed to conform to this specification will use “little endian” operation.

In some memory layout descriptions, certain fields are marked reserved. Software must initialize such fields to zero and ignore them when read. On an update operation, software must preserve any reserved field.

April 1, 2004

Read the full EFI Processor Subclass Specification.

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