diff options
author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
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committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseLib/Ia32/CpuId.c | |
parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/Ia32/CpuId.c')
-rw-r--r-- | Core/MdePkg/Library/BaseLib/Ia32/CpuId.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/CpuId.c b/Core/MdePkg/Library/BaseLib/Ia32/CpuId.c new file mode 100644 index 0000000000..09487f77f2 --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/Ia32/CpuId.c @@ -0,0 +1,74 @@ +/** @file
+ AsmCpuid function.
+
+ Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+/**
+ Retrieves CPUID information.
+
+ Executes the CPUID instruction with EAX set to the value specified by Index.
+ This function always returns Index.
+ If Eax is not NULL, then the value of EAX after CPUID is returned in Eax.
+ If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx.
+ If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx.
+ If Edx is not NULL, then the value of EDX after CPUID is returned in Edx.
+ This function is only available on IA-32 and x64.
+
+ @param Index The 32-bit value to load into EAX prior to invoking the CPUID
+ instruction.
+ @param RegisterEax A pointer to the 32-bit EAX value returned by the CPUID
+ instruction. This is an optional parameter that may be NULL.
+ @param RegisterEbx A pointer to the 32-bit EBX value returned by the CPUID
+ instruction. This is an optional parameter that may be NULL.
+ @param RegisterEcx A pointer to the 32-bit ECX value returned by the CPUID
+ instruction. This is an optional parameter that may be NULL.
+ @param RegisterEdx A pointer to the 32-bit EDX value returned by the CPUID
+ instruction. This is an optional parameter that may be NULL.
+
+ @return Index.
+
+**/
+UINT32
+EFIAPI
+AsmCpuid (
+ IN UINT32 Index,
+ OUT UINT32 *RegisterEax, OPTIONAL
+ OUT UINT32 *RegisterEbx, OPTIONAL
+ OUT UINT32 *RegisterEcx, OPTIONAL
+ OUT UINT32 *RegisterEdx OPTIONAL
+ )
+{
+ _asm {
+ mov eax, Index
+ cpuid
+ push ecx
+ mov ecx, RegisterEax
+ jecxz SkipEax
+ mov [ecx], eax
+SkipEax:
+ mov ecx, RegisterEbx
+ jecxz SkipEbx
+ mov [ecx], ebx
+SkipEbx:
+ pop eax
+ mov ecx, RegisterEcx
+ jecxz SkipEcx
+ mov [ecx], eax
+SkipEcx:
+ mov ecx, RegisterEdx
+ jecxz SkipEdx
+ mov [ecx], edx
+SkipEdx:
+ mov eax, Index
+ }
+}
+
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