1 files changed, 99 insertions, 0 deletions
diff --git a/ReferenceCode/Haswell/Library/TxtLib/Ia32/TxtPeiLib.asm b/ReferenceCode/Haswell/Library/TxtLib/Ia32/TxtPeiLib.asm
new file mode 100644
index 0000000..34fcd35
--- /dev/null
+++ b/ReferenceCode/Haswell/Library/TxtLib/Ia32/TxtPeiLib.asm
@@ -0,0 +1,99 @@
+;/*++                                                             
+;  This file contains an 'Intel Peripheral Driver' and uniquely   
+;  identified as "Intel Reference Module" and is                  
+;  licensed for Intel CPUs and chipsets under the terms of your   
+;  license agreement with Intel or your vendor.  This file may    
+;  be modified by the user, subject to additional terms of the    
+;  license agreement                                              
+;--*/                                                             
+;                                                                 
+;/*++                                                             
+;                                                                 
+;  Copyright (c) 2012 Intel Corporation. All rights reserved
+;  This software and associated documentation (if any) is furnished
+;  under a license and may only be used or copied in accordance
+;  with the terms of the license. Except as permitted by such
+;  license, no part of this software or documentation may be
+;  reproduced, stored in a retrieval system, or transmitted in any
+;  form or by any means without the express written consent of
+;  Intel Corporation.
+; 
+; 
+; Module Name:
+; 
+;   TxtPeiLib.asm
+; 
+; Abstract:
+; 
+;   This file contains the code to determine Processor/Chipset TXT capaiblity
+;
+;--*/
+
+    .XLIST
+    include txt.inc
+    .LIST
+
+    .686P
+    .MMX
+    .XMM
+    .MODEL FLAT,C
+    .CODE
+
+;-----------------------------------------------------------------------------
+;-----------------------------------------------------------------------------
+;  Procedure:	CheckSmxCapabilities
+; 
+;  Input:	None
+; 
+;  Output:	None
+; 
+;  Registers:	None are preserved
+; 
+;  Description:	Execute GETSEC[CAPABILITIES] to report the SMX capabilities
+; 
+;-----------------------------------------------------------------------------
+;-----------------------------------------------------------------------------
+
+CheckSmxCapabilities PROC PUBLIC USES ebx
+
+    ;
+    ; Check whether SMX is supported
+    ;
+    mov     eax, 1
+    cpuid
+    bt      ecx, IA32_CPUID_SMX_B
+
+    .IF !CARRY?
+        mov     eax, 0
+        jmp     @F
+    .ENDIF
+
+    ;
+    ; Save cr4 
+    ;
+    mov     edx, CR4
+
+    ;
+    ; Enable SMXE
+    ;
+    mov     eax, CR4
+    or      eax, CR4_SMXE
+    mov     CR4, eax
+
+    ;
+    ; Call GETSEC[CAPABILITIES]
+    ;
+    mov     eax, CAPABILITIES        ; eax = CAPABILITIES
+    mov     ebx, 0
+    _GETSEC
+
+    ;
+    ; Restore cr4 
+    ;
+    mov     CR4, edx
+
+@@:
+    ret
+CheckSmxCapabilities ENDP
+
+END