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/*********************************************************
* Copyright (C) 2008-2015 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*
* vm_basic_math.h --
*
* Standard mathematical macros for VMware source code.
*/
#ifndef _VM_BASIC_MATH_H_
#define _VM_BASIC_MATH_H_
#define INCLUDE_ALLOW_USERLEVEL
#define INCLUDE_ALLOW_MODULE
#define INCLUDE_ALLOW_VMMON
#define INCLUDE_ALLOW_VMKERNEL
#define INCLUDE_ALLOW_VMKDRIVERS
#define INCLUDE_ALLOW_VMK_MODULE
#define INCLUDE_ALLOW_DISTRIBUTE
#define INCLUDE_ALLOW_VMCORE
#include "includeCheck.h"
#include "vm_basic_types.h" // For INLINE.
#include "vm_basic_asm.h" // For Div64...
static INLINE uint32
RatioOf(uint32 numer1, uint32 numer2, uint32 denom)
{
uint64 numer = (uint64)numer1 * numer2;
/* Calculate "(numer1 * numer2) / denom" avoiding round-off errors. */
#if defined(VMM) || !(defined(__i386__) || defined(__x86_64__))
return numer / denom;
#else
uint32 ratio;
uint32 unused;
Div643232(numer, denom, &ratio, &unused);
return ratio;
#endif
}
static INLINE uint32
ExponentialAvg(uint32 avg, uint32 value, uint32 gainNumer, uint32 gainDenom)
{
uint32 term1 = gainNumer * avg;
uint32 term2 = (gainDenom - gainNumer) * value;
return (term1 + term2) / gainDenom;
}
static INLINE Bool
IsPowerOfTwo(uint32 x)
{
/* Does not check for zero. Callers depend on this. */
return !(x & (x - 1));
}
static INLINE uint32
GetPowerOfTwo(uint32 x)
{
/* Returns next-greatest power-of-two. */
uint32 power2 = 1;
while (x > power2) {
power2 = power2 << 1;
}
return power2;
}
#endif // ifndef _VM_BASIC_MATH_H_
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