/// @file
///  IPF specific Machine Specific Registers accessing functions. 
///  This implementation uses raw data to prepresent the assembly instruction of 
/// mov msr[]= and mov =msr[].
///
/// 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::
//
// The follow 16 bytes stand for the bundle of 
//   mov    r8=msr[in0];;
// since MSFT tool chain does not support mov =msr[] instruction
//
  data1 0x0D
  data1 0x40
  data1 0x00
  data1 0x40
  data1 0x16
  data1 0x04
  data1 0x00
  data1 0x00
  data1 0x00
  data1 0x02
  data1 0x00
  data1 0x00
  data1 0x00
  data1 0x00
  data1 0x04
  data1 0x00
  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::
//
// The follow 16 bytes stand for the bundle of 
//  mov             msr[in0] = in1
//  mov             r8 = in1;;
// since MSFT tool chain does not support mov msr[]= instruction
//
  data1 0x0D
  data1 0x00
  data1 0x84
  data1 0x40
  data1 0x06
  data1 0x04
  data1 0x00
  data1 0x00
  data1 0x00
  data1 0x02
  data1 0x00
  data1 0x00
  data1 0x01
  data1 0x08
  data1 0x01
  data1 0x84
  srlz.d;;
  br.ret.sptk     b0;;
.endp   AsmWriteMsr