Reviewed-by: Eric Dong
-Original Message-
From: Ni, Ray
Sent: Tuesday, October 19, 2021 2:42 PM
To: devel@edk2.groups.io
Cc: Dong, Eric ; Kumar, Rahul1
Subject: [PATCH] UefiCpuPkg/UefiCpuLib: Add GetCpuFamilyModel and
GetCpuSteppingId
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3698
Lots of code relies on CPU Family/Model/Stepping for different logics.
The change adds two APIs for such needs.
Signed-off-by: Ray Ni
Cc: Eric Dong
Cc: Rahul Kumar
---
UefiCpuPkg/Include/Library/UefiCpuLib.h | 23 +-
.../Library/BaseUefiCpuLib/BaseUefiCpuLib.c | 43 +++
2 files changed, 65 insertions(+), 1 deletion(-)
diff --git a/UefiCpuPkg/Include/Library/UefiCpuLib.h
b/UefiCpuPkg/Include/Library/UefiCpuLib.h
index 5326e72463..092c1d2116 100644
--- a/UefiCpuPkg/Include/Library/UefiCpuLib.h
+++ b/UefiCpuPkg/Include/Library/UefiCpuLib.h
@@ -4,7 +4,7 @@
This library class defines some routines that are generic for IA32 family CPU
to be UEFI specification compliant.
- Copyright (c) 2009, Intel Corporation. All rights reserved.
+ Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved.
Copyright (c) 2020, AMD Inc. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -43,4 +43,25 @@ StandardSignatureIsAuthenticAMD (
VOID
);
+/**
+ Return the 32bit CPU family and model value.
+
+ @return CPUID[01h].EAX with Processor Type and Stepping ID cleared.
+**/
+UINT32
+EFIAPI
+GetCpuFamilyModel (
+ VOID
+ );
+
+/**
+ Return the CPU stepping ID.
+ @return CPU stepping ID value in CPUID[01h].EAX.
+**/
+UINT8
+EFIAPI
+GetCpuSteppingId (
+ VOID
+ );
+
#endif
diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c
b/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c
index c2cc3ff9a7..50891618c4 100644
--- a/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c
+++ b/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c
@@ -4,6 +4,7 @@
The library routines are UEFI specification compliant.
Copyright (c) 2020, AMD Inc. All rights reserved.
+ Copyright (c) 2021, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -36,3 +37,45 @@ StandardSignatureIsAuthenticAMD (
RegEcx == CPUID_SIGNATURE_AUTHENTIC_AMD_ECX &&
RegEdx == CPUID_SIGNATURE_AUTHENTIC_AMD_EDX);
}
+
+/**
+ Return the 32bit CPU family and model value.
+
+ @return CPUID[01h].EAX with Processor Type and Stepping ID cleared.
+**/
+UINT32
+EFIAPI
+GetCpuFamilyModel (
+ VOID
+ )
+{
+ CPUID_VERSION_INFO_EAX Eax;
+
+ AsmCpuid (CPUID_VERSION_INFO, &Eax.Uint32, NULL, NULL, NULL);
+
+ //
+ // Mask other fields than Family and Model.
+ //
+ Eax.Bits.SteppingId= 0;
+ Eax.Bits.ProcessorType = 0;
+ Eax.Bits.Reserved1 = 0;
+ Eax.Bits.Reserved2 = 0;
+ return Eax.Uint32;
+}
+
+/**
+ Return the CPU stepping ID.
+ @return CPU stepping ID value in CPUID[01h].EAX.
+**/
+UINT8
+EFIAPI
+GetCpuSteppingId (
+ VOID
+ )
+{
+ CPUID_VERSION_INFO_EAX Eax;
+
+ AsmCpuid (CPUID_VERSION_INFO, &Eax.Uint32, NULL, NULL, NULL);
+
+ return (UINT8) Eax.Bits.SteppingId;
+}
--
2.32.0.windows.1
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#83507): https://edk2.groups.io/g/devel/message/83507
Mute This Topic: https://groups.io/mt/86434196/21656
Group Owner: devel+ow...@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-