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 0000000000..189e9e6be0
--- /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