1. Simplify the implementation of AsmReadApplicationRegister() & AsmReadControlRegister() for IPF architecture.

2. Add AsmReadMsr() & AsmWriteMsr() for IPF architecture
3. update AsmCpuMisc.s to only support GCC tool chain to avoid symbol collision.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7034 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/Ipf/AccessMsr.s

@@ -0,0 +1,79 @@
+/// @file
+///  IPF specific Machine Specific Registers accessing functions.
+///
+/// Copyright (c) 2008, Intel Corporation
+/// 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.
+///
+///
+///
+
+
+//---------------------------------------------------------------------------------
+//++
+// AsmReadMsr
+//
+// Reads the current value of a Machine Specific Register (MSR).
+//
+// Reads and returns the current value of the Machine Specific Register specified by Index.  No
+// parameter checking is performed on Index, and if the Index value is beyond the implemented MSR
+// register range, a Reserved Register/Field fault may occur.  The caller must either guarantee that
+// Index is valid, or the caller must set up fault handlers to catch the faults.  This function is
+// only available on IPF.
+//
+// Arguments :
+//
+// On Entry : The 8-bit Machine Specific Register index to read.
+//
+// Return Value: The current value of the Machine Specific Register specified by Index.
+//
+//--
+//----------------------------------------------------------------------------------
+.text
+.type   AsmReadMsr, @function
+.proc   AsmReadMsr
+.regstk 1, 0, 0, 0
+
+AsmReadMsr::
+  mov    r8=msr[in0];;
+  br.ret.sptk  b0;;
+.endp   AsmReadMsr
+
+//---------------------------------------------------------------------------------
+//++
+// AsmWriteMsr
+//
+// Writes the current value of a Machine Specific Register (MSR).
+//
+// Writes Value to the Machine Specific Register specified by Index.  Value is returned.  No
+// parameter checking is performed on Index, and if the Index value is beyond the implemented MSR
+// register range, a Reserved Register/Field fault may occur.  The caller must either guarantee that
+// Index is valid, or the caller must set up fault handlers to catch the faults.  This function is
+// only available on IPF.
+//
+// Arguments :
+//
+// On Entry : The 8-bit Machine Specific Register index to write.
+//            The 64-bit value to write to the Machine Specific Register.
+//
+// Return Value: The 64-bit value to write to the Machine Specific Register.
+//
+//--
+//----------------------------------------------------------------------------------
+.text
+.type   AsmWriteMsr, @function
+.proc   AsmWriteMsr
+.regstk 2, 0, 0, 0
+
+AsmWriteMsr::
+  mov             msr[in0] = in1
+  mov             r8 = in1;;
+  srlz.d;;
+  br.ret.sptk     b0;;
+.endp   AsmWriteMsr
+