Initial import.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524

Tools/Source/TianoTools/Common/PeiLib/Ipf/math.c

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+/*++
+
+Copyright (c) 2004, 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.             
+
+Module Name:
+
+  math.c
+
+Abstract:
+
+  64-bit Math worker functions for Intel Itanium(TM) processors.
+
+--*/
+
+#include "Tiano.h"
+#include "Pei.h"
+#include "PeiLib.h"
+
+UINT64
+LShiftU64 (
+  IN UINT64   Operand,
+  IN UINTN    Count
+  )
+/*++
+
+Routine Description:
+
+  This routine allows a 64 bit value to be left shifted by 32 bits and 
+  returns the shifted value.
+  Count is valid up 63. (Only Bits 0-5 is valid for Count)
+
+Arguments:
+
+  Operand - Value to be shifted
+  Count   - Number of times to shift left.
+ 
+Returns:
+
+  Value shifted left identified by the Count.
+
+--*/
+{
+  return Operand << Count;
+}
+
+UINT64
+RShiftU64 (
+  IN UINT64   Operand,
+  IN UINTN    Count
+  )
+/*++
+
+Routine Description:
+
+  This routine allows a 64 bit value to be right shifted by 32 bits and returns the 
+  shifted value.
+  Count is valid up 63. (Only Bits 0-5 is valid for Count)
+
+Arguments:
+
+  Operand - Value to be shifted
+  Count   - Number of times to shift right.
+ 
+Returns:
+
+  Value shifted right identified by the Count.
+
+--*/
+{
+  return Operand >> Count;
+}
+
+UINT64
+MultU64x32 (
+  IN UINT64   Multiplicand,
+  IN UINTN    Multiplier
+  )
+/*++  
+  
+Routine Description:
+
+  This routine allows a 64 bit value to be multiplied with a 32 bit 
+  value returns 64bit result.
+  No checking if the result is greater than 64bits
+
+Arguments:
+
+  Multiplicand  - multiplicand
+  Multiplier    - multiplier
+
+Returns:
+
+  Multiplicand * Multiplier
+  
+--*/
+{
+  return Multiplicand * Multiplier;
+}
+
+UINT64
+DivU64x32 (
+  IN UINT64   Dividend,
+  IN UINTN    Divisor,
+  OUT UINTN   *Remainder OPTIONAL
+  )
+/*++
+
+Routine Description:
+
+  This routine allows a 64 bit value to be divided with a 32 bit value returns 
+  64bit result and the Remainder.
+  N.B. only works for 31bit divisors!!
+
+Arguments:
+
+  Dividend  - dividend
+  Divisor   - divisor
+  Remainder - buffer for remainder
+ 
+Returns:
+
+  Dividend  / Divisor
+  Remainder = Dividend mod Divisor
+
+--*/
+{
+  if (Remainder) {
+    *Remainder = Dividend % Divisor;
+  }
+
+  return Dividend / Divisor;
+}