/* $NetBSD: math.c,v 1.1.1.1 2018/08/16 18:17:47 jmcneill Exp $ */ /* * Copright (C) 2014 Linaro Ltd. * Author: Ard Biesheuvel * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice and this list of conditions, without modification. * 2. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License as published by the Free Software Foundation; * either version 2 of the License, or (at your option) any later version. */ #include "lib.h" UINT64 LShiftU64 ( IN UINT64 Operand, IN UINTN Count ) // Left shift 64bit by 32bit and get a 64bit result { return Operand << Count; } UINT64 RShiftU64 ( IN UINT64 Operand, IN UINTN Count ) // Right shift 64bit by 32bit and get a 64bit result { return Operand >> Count; } UINT64 MultU64x32 ( IN UINT64 Multiplicand, IN UINTN Multiplier ) // Multiple 64bit by 32bit and get a 64bit result { return Multiplicand * Multiplier; } UINT64 DivU64x32 ( IN UINT64 Dividend, IN UINTN Divisor, OUT UINTN *Remainder OPTIONAL ) // divide 64bit by 32bit and get a 64bit result // N.B. only works for 31bit divisors!! { if (Remainder) *Remainder = Dividend % Divisor; return Dividend / Divisor; }