878ddf1fc3
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524
140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
/*++
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Copyright (c) 2004, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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math.c
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Abstract:
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64-bit Math worker functions for Intel Itanium(TM) processors.
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--*/
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#include "Tiano.h"
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#include "Pei.h"
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#include "PeiLib.h"
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UINT64
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LShiftU64 (
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IN UINT64 Operand,
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IN UINTN Count
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)
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/*++
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Routine Description:
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This routine allows a 64 bit value to be left shifted by 32 bits and
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returns the shifted value.
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Count is valid up 63. (Only Bits 0-5 is valid for Count)
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Arguments:
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Operand - Value to be shifted
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Count - Number of times to shift left.
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Returns:
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Value shifted left identified by the Count.
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--*/
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{
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return Operand << Count;
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}
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UINT64
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RShiftU64 (
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IN UINT64 Operand,
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IN UINTN Count
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)
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/*++
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Routine Description:
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This routine allows a 64 bit value to be right shifted by 32 bits and returns the
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shifted value.
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Count is valid up 63. (Only Bits 0-5 is valid for Count)
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Arguments:
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Operand - Value to be shifted
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Count - Number of times to shift right.
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Returns:
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Value shifted right identified by the Count.
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--*/
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{
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return Operand >> Count;
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}
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UINT64
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MultU64x32 (
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IN UINT64 Multiplicand,
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IN UINTN Multiplier
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)
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/*++
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Routine Description:
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This routine allows a 64 bit value to be multiplied with a 32 bit
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value returns 64bit result.
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No checking if the result is greater than 64bits
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Arguments:
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Multiplicand - multiplicand
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Multiplier - multiplier
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Returns:
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Multiplicand * Multiplier
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--*/
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{
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return Multiplicand * Multiplier;
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}
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UINT64
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DivU64x32 (
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IN UINT64 Dividend,
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IN UINTN Divisor,
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OUT UINTN *Remainder OPTIONAL
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)
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/*++
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Routine Description:
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This routine allows a 64 bit value to be divided with a 32 bit value returns
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64bit result and the Remainder.
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N.B. only works for 31bit divisors!!
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Arguments:
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Dividend - dividend
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Divisor - divisor
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Remainder - buffer for remainder
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Returns:
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Dividend / Divisor
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Remainder = Dividend mod Divisor
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--*/
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{
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if (Remainder) {
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*Remainder = Dividend % Divisor;
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}
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return Dividend / Divisor;
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}
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