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/Include/Library/BaseLib.h

@@ -4897,6 +4897,50 @@ AsmReadApplicationRegister (
   );
 
 
+/**
+  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.
+
+  @param  Index                     The 8-bit Machine Specific Register index to read.
+
+  @return The current value of the Machine Specific Register specified by Index.  
+
+**/
+UINT64
+EFIAPI
+AsmReadMsr (
+  IN UINT8   Index  
+  );
+
+
+/**
+  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.
+
+  @param  Index                     The 8-bit Machine Specific Register index to write.
+  @param  Value                     The 64-bit value to write to the Machine Specific Register.
+
+  @return The 64-bit value to write to the Machine Specific Register.  
+
+**/
+UINT64
+EFIAPI
+AsmWriteMsr (
+  IN UINT8   Index, 
+  IN UINT64  Value  
+  );
+
+
 /**
   Determines if the CPU is currently executing in virtual, physical, or mixed mode.