diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/Ia32/CpuId.c')
-rw-r--r-- | MdePkg/Library/BaseLib/Ia32/CpuId.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/CpuId.c b/MdePkg/Library/BaseLib/Ia32/CpuId.c new file mode 100644 index 0000000..189e9e6 --- /dev/null +++ b/MdePkg/Library/BaseLib/Ia32/CpuId.c @@ -0,0 +1,52 @@ +/** @file
+ AsmCpuid function.
+
+ Copyright (c) 2006, Intel Corporation<BR>
+ All rights reserved. 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.
+
+**/
+
+#if _MSC_EXTENSIONS
+
+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
+ }
+}
+
+#endif
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