Cpuid.h File Reference

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Data Structures
union	CPUID_AMD_EXTENDED_CPU_SIG_EAX
union	CPUID_AMD_EXTENDED_CPU_SIG_EBX
union	CPUID_AMD_EXTENDED_CPU_SIG_ECX
union	CPUID_AMD_EXTENDED_CPU_SIG_EDX
union	CPUID_AMD_VIR_PHY_ADDRESS_SIZE_EAX
union	CPUID_AMD_VIR_PHY_ADDRESS_SIZE_EBX
union	CPUID_AMD_VIR_PHY_ADDRESS_SIZE_ECX
union	CPUID_AMD_PROCESSOR_TOPOLOGY_EAX
union	CPUID_AMD_PROCESSOR_TOPOLOGY_EBX
union	CPUID_AMD_PROCESSOR_TOPOLOGY_ECX
union	CPUID_MEMORY_ENCRYPTION_INFO_EAX
union	CPUID_MEMORY_ENCRYPTION_INFO_EBX
union	CPUID_MEMORY_ENCRYPTION_INFO_ECX
union	CPUID_MEMORY_ENCRYPTION_INFO_EDX

Macros
#define	AMD_CPUID_EXTENDED_TOPOLOGY   0x80000026
#define	CPUID_AMD_PROCESSOR_TOPOLOGY   0x8000001E
#define	CPUID_MEMORY_ENCRYPTION_INFO   0x8000001F
#define	CPUID_SIGNATURE_AUTHENTIC_AMD_EBX   SIGNATURE_32 ('A', 'u', 't', 'h')
#define	CPUID_SIGNATURE_AUTHENTIC_AMD_EDX   SIGNATURE_32 ('e', 'n', 't', 'i')
#define	CPUID_SIGNATURE_AUTHENTIC_AMD_ECX   SIGNATURE_32 ('c', 'A', 'M', 'D')

Detailed Description

CPUID leaf definitions.

Provides defines for CPUID leaf indexes. Data structures are provided for registers returned by a CPUID leaf that contain one or more bit fields. If a register returned is a single 32-bit value, then a data structure is not provided for that register.

Copyright (c) 2017 - 2024, Advanced Micro Devices. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Specification Reference:

AMD64 Architecture Programming Manual volume 2, March 2024

Definition in file Cpuid.h.

Macro Definition Documentation

AMD_CPUID_EXTENDED_TOPOLOGY

#define AMD_CPUID_EXTENDED_TOPOLOGY   0x80000026

CPUID Extended Topology Enumeration

Note

Reference: AMD64 Architecture Programmer's Manual Volume 3: General-Purpose and System Instructions, Revision 3.35 Appendix E, E.4.24 Function 8000_0026-Extended CPU Topology: CPUID Fn8000_0026 reports extended topology information for logical processors, including asymmetric and heterogenous topology descriptions. Individual logical processors may report different values in systems with asynchronous and heterogeneous topologies. The topology level is selected by the value passed to the instruction in ECX. To discover the topology of a system, software should execute CPUID Fn8000_0026 with increasing ECX values, starting with a value of zero, until the returned hierarchy level type (CPUID Fn8000_0026_ECX[LevelType]) is equal to zero. It is not guaranteed that all topology level types are present in the system

Parameters

EAX	AMD_CPUID_EXTENDED_TOPOLOGY (0x80000026)
ECX	Level number

Definition at line 64 of file Cpuid.h.

CPUID_AMD_PROCESSOR_TOPOLOGY

#define CPUID_AMD_PROCESSOR_TOPOLOGY   0x8000001E

CPUID AMD Processor Topology

Parameters

EAX	CPUID_AMD_PROCESSOR_TOPOLOGY (0x8000001E)

Return values

EAX	Extended APIC ID described by the type CPUID_AMD_PROCESSOR_TOPOLOGY_EAX.
EBX	Core Identifiers described by the type CPUID_AMD_PROCESSOR_TOPOLOGY_EBX.
ECX	Node Identifiers described by the type CPUID_AMD_PROCESSOR_TOPOLOGY_ECX.
EDX	Reserved.

Definition at line 540 of file Cpuid.h.

CPUID_MEMORY_ENCRYPTION_INFO

#define CPUID_MEMORY_ENCRYPTION_INFO   0x8000001F

CPUID Memory Encryption Information

Parameters

EAX	CPUID_MEMORY_ENCRYPTION_INFO (0x8000001F)

Return values

EAX	Returns the memory encryption feature support status.
EBX	If memory encryption feature is present then return the page table bit number used to enable memory encryption support and reducing of physical address space in bits.
ECX	Returns number of encrypted guest supported simultaneously.
EDX	Returns minimum SEV enabled and SEV disabled ASID.

Example usage

UINT32 Eax;
UINT32 Ebx;
UINT32 Ecx;
UINT32 Edx;
 
AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, &Eax, &Ebx, &Ecx, &Edx);

Definition at line 641 of file Cpuid.h.

CPUID_SIGNATURE_AUTHENTIC_AMD_EBX

#define CPUID_SIGNATURE_AUTHENTIC_AMD_EBX   SIGNATURE_32 ('A', 'u', 't', 'h')

CPUID Signature Information

Parameters

EAX	CPUID_SIGNATURE (0x00)

Return values

EAX	Returns the highest value the CPUID instruction recognizes for returning basic processor information. The value is returned is processor specific.
EBX	First 4 characters of a vendor identification string.
ECX	Last 4 characters of a vendor identification string.
EDX	Middle 4 characters of a vendor identification string. CPUID signature values returned by AMD processors

Definition at line 38 of file Cpuid.h.

CPUID_SIGNATURE_AUTHENTIC_AMD_ECX

#define CPUID_SIGNATURE_AUTHENTIC_AMD_ECX   SIGNATURE_32 ('c', 'A', 'M', 'D')

Definition at line 40 of file Cpuid.h.

CPUID_SIGNATURE_AUTHENTIC_AMD_EDX

#define CPUID_SIGNATURE_AUTHENTIC_AMD_EDX   SIGNATURE_32 ('e', 'n', 't', 'i')

Definition at line 39 of file Cpuid.h.