MdePkg/BaseLib: Support IA32 processors without CLFLUSH

Use CPUID Leaf 01 to detect support for CLFLUSH instruction.  

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17212 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/Ia32/FlushCacheLine.asm

@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------
 ;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2006 - 2015, 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
@@ -34,9 +34,20 @@
 ;   );
 ;------------------------------------------------------------------------------
 AsmFlushCacheLine   PROC
+    ;
+    ; If the CPU does not support CLFLUSH instruction, 
+    ; then promote flush range to flush entire cache.
+    ;
+    mov     eax, 1
+    cpuid
     mov     eax, [esp + 4]
+    test    edx, BIT19
+    jz      @F
     clflush [eax]
     ret
+@@:
+    wbinvd
+    ret
 AsmFlushCacheLine   ENDP
 
     END