There are two libraries: MdePkg/CpuLib and UefiCpuPkg/UefiCpuLib. This
patch merges UefiCpuPkg/UefiCpuLib to MdePkg/CpuLib.
Cc: Michael D Kinney <michael.d.kin...@intel.com>
Cc: Liming Gao <gaolim...@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang....@intel.com>
Signed-off-by: Yu Pu <yu...@intel.com>
---
MdePkg/Library/BaseCpuLib/X86BaseCpuLib.c | 75 ++++++++++++++++++++
MdePkg/Include/Library/CpuLib.h | 48 +++++++++++++
MdePkg/Library/BaseCpuLib/BaseCpuLib.inf | 6 ++
MdePkg/Library/BaseCpuLib/Ia32/InitializeFpu.nasm | 68 ++++++++++++++++++
MdePkg/Library/BaseCpuLib/X64/InitializeFpu.nasm | 51 +++++++++++++
5 files changed, 248 insertions(+)
diff --git a/MdePkg/Library/BaseCpuLib/X86BaseCpuLib.c
b/MdePkg/Library/BaseCpuLib/X86BaseCpuLib.c
new file mode 100644
index 000000000000..e69f00417022
--- /dev/null
+++ b/MdePkg/Library/BaseCpuLib/X86BaseCpuLib.c
@@ -0,0 +1,75 @@
+/** @file
+ This library defines some routines that are generic for IA32 family CPU.
+ The library routines are UEFI specification compliant.
+ Copyright (c) 2020, AMD Inc. All rights reserved.<BR>
+ Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Register/Intel/Cpuid.h>
+#include <Register/Amd/Cpuid.h>
+
+#include <Library/BaseLib.h>
+#include <Library/CpuLib.h>
+
+/**
+ Determine if the standard CPU signature is "AuthenticAMD".
+ @retval TRUE The CPU signature matches.
+ @retval FALSE The CPU signature does not match.
+**/
+BOOLEAN
+EFIAPI
+StandardSignatureIsAuthenticAMD (
+ VOID
+ )
+{
+ UINT32 RegEbx;
+ UINT32 RegEcx;
+ UINT32 RegEdx;
+
+ AsmCpuid (CPUID_SIGNATURE, NULL, &RegEbx, &RegEcx, &RegEdx);
+ return (RegEbx == CPUID_SIGNATURE_AUTHENTIC_AMD_EBX &&
+ 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;
+}
diff --git a/MdePkg/Include/Library/CpuLib.h b/MdePkg/Include/Library/CpuLib.h
index 25f6d9478c52..3f29937dc71b 100644
--- a/MdePkg/Include/Library/CpuLib.h
+++ b/MdePkg/Include/Library/CpuLib.h
@@ -41,4 +41,52 @@ CpuFlushTlb (
VOID
);
+#if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
+
+/**
+ Initializes floating point units for requirement of UEFI specification.
+ This function initializes floating-point control word to 0x027F (all
exceptions
+ masked,double-precision, round-to-nearest) and multimedia-extensions control
word
+ (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to
zero
+ for masked underflow).
+**/
+VOID
+EFIAPI
+InitializeFloatingPointUnits (
+ VOID
+ );
+
+/**
+ Determine if the standard CPU signature is "AuthenticAMD".
+ @retval TRUE The CPU signature matches.
+ @retval FALSE The CPU signature does not match.
+**/
+BOOLEAN
+EFIAPI
+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
+
#endif
diff --git a/MdePkg/Library/BaseCpuLib/BaseCpuLib.inf
b/MdePkg/Library/BaseCpuLib/BaseCpuLib.inf
index 950f5229b2a4..7cdbb552c08c 100644
--- a/MdePkg/Library/BaseCpuLib/BaseCpuLib.inf
+++ b/MdePkg/Library/BaseCpuLib/BaseCpuLib.inf
@@ -28,6 +28,9 @@
# VALID_ARCHITECTURES = IA32 X64 EBC ARM AARCH64 RISCV64
#
+[Sources.IA32, Sources.X64]
+ X86BaseCpuLib.c
+
[Sources.IA32]
Ia32/CpuSleep.c | MSFT
Ia32/CpuFlushTlb.c | MSFT
@@ -38,10 +41,13 @@
Ia32/CpuSleepGcc.c | GCC
Ia32/CpuFlushTlbGcc.c | GCC
+ Ia32/InitializeFpu.nasm
+
[Sources.X64]
X64/CpuFlushTlb.nasm
X64/CpuSleep.nasm
+ X64/InitializeFpu.nasm
[Sources.EBC]
Ebc/CpuSleepFlushTlb.c
diff --git a/MdePkg/Library/BaseCpuLib/Ia32/InitializeFpu.nasm
b/MdePkg/Library/BaseCpuLib/Ia32/InitializeFpu.nasm
new file mode 100644
index 000000000000..5e27cc325012
--- /dev/null
+++ b/MdePkg/Library/BaseCpuLib/Ia32/InitializeFpu.nasm
@@ -0,0 +1,68 @@
+;------------------------------------------------------------------------------
+;*
+;* Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
+;* SPDX-License-Identifier: BSD-2-Clause-Patent
+;*
+;*
+;------------------------------------------------------------------------------
+
+ SECTION .rodata
+
+;
+; Float control word initial value:
+; all exceptions masked, double-precision, round-to-nearest
+;
+mFpuControlWord: DW 0x27F
+;
+; Multimedia-extensions control word:
+; all exceptions masked, round-to-nearest, flush to zero for masked underflow
+;
+mMmxControlWord: DD 0x1F80
+
+ SECTION .text
+
+;
+; Initializes floating point units for requirement of UEFI specification.
+;
+; This function initializes floating-point control word to 0x027F (all
exceptions
+; masked,double-precision, round-to-nearest) and multimedia-extensions control
word
+; (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to
zero
+; for masked underflow).
+;
+global ASM_PFX(InitializeFloatingPointUnits)
+ASM_PFX(InitializeFloatingPointUnits):
+
+ push ebx
+
+ ;
+ ; Initialize floating point units
+ ;
+ finit
+ fldcw [mFpuControlWord]
+
+ ;
+ ; Use CpuId instructuion (CPUID.01H:EDX.SSE[bit 25] = 1) to test
+ ; whether the processor supports SSE instruction.
+ ;
+ mov eax, 1
+ cpuid
+ bt edx, 25
+ jnc Done
+
+ ;
+ ; Set OSFXSR bit 9 in CR4
+ ;
+ mov eax, cr4
+ or eax, BIT9
+ mov cr4, eax
+
+ ;
+ ; The processor should support SSE instruction and we can use
+ ; ldmxcsr instruction
+ ;
+ ldmxcsr [mMmxControlWord]
+Done:
+ pop ebx
+
+ ret
+
diff --git a/MdePkg/Library/BaseCpuLib/X64/InitializeFpu.nasm
b/MdePkg/Library/BaseCpuLib/X64/InitializeFpu.nasm
new file mode 100644
index 000000000000..8485b4713548
--- /dev/null
+++ b/MdePkg/Library/BaseCpuLib/X64/InitializeFpu.nasm
@@ -0,0 +1,51 @@
+;------------------------------------------------------------------------------
+;*
+;* Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
+;* SPDX-License-Identifier: BSD-2-Clause-Patent
+;*
+;*
+;------------------------------------------------------------------------------
+
+ SECTION .rodata
+;
+; Float control word initial value:
+; all exceptions masked, double-extended-precision, round-to-nearest
+;
+mFpuControlWord: DW 0x37F
+;
+; Multimedia-extensions control word:
+; all exceptions masked, round-to-nearest, flush to zero for masked underflow
+;
+mMmxControlWord: DD 0x1F80
+
+DEFAULT REL
+SECTION .text
+
+;
+; Initializes floating point units for requirement of UEFI specification.
+;
+; This function initializes floating-point control word to 0x027F (all
exceptions
+; masked,double-precision, round-to-nearest) and multimedia-extensions control
word
+; (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to
zero
+; for masked underflow).
+;
+global ASM_PFX(InitializeFloatingPointUnits)
+ASM_PFX(InitializeFloatingPointUnits):
+
+ ;
+ ; Initialize floating point units
+ ;
+ finit
+ fldcw [mFpuControlWord]
+
+ ;
+ ; Set OSFXSR bit 9 in CR4
+ ;
+ mov rax, cr4
+ or rax, BIT9
+ mov cr4, rax
+
+ ldmxcsr [mMmxControlWord]
+
+ ret
+
--
2.30.0.windows.2
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