mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-23 11:35:19 +01:00
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/** @file
|
|
Copyright (C) 2019, vit9696. All rights reserved.
|
|
|
|
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.
|
|
**/
|
|
|
|
#include <Library/BaseLib.h>
|
|
#include <Library/OcMiscLib.h>
|
|
|
|
/**
|
|
MultThenDivU64x64x32 is from MdeModulePkg's PciRootBridgeIo.c
|
|
|
|
Copyright (c) 1999 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
UINT64
|
|
MultThenDivU64x64x32 (
|
|
IN UINT64 Multiplicand,
|
|
IN UINT64 Multiplier,
|
|
IN UINT32 Divisor,
|
|
OUT UINT32 *Remainder OPTIONAL
|
|
)
|
|
{
|
|
UINT64 Uint64;
|
|
UINT32 LocalRemainder;
|
|
UINT32 Uint32;
|
|
if (Multiplicand > DivU64x64Remainder (MAX_UINT64, Multiplier, NULL)) {
|
|
//
|
|
// Make sure Multiplicand is the bigger one.
|
|
//
|
|
if (Multiplicand < Multiplier) {
|
|
Uint64 = Multiplicand;
|
|
Multiplicand = Multiplier;
|
|
Multiplier = Uint64;
|
|
}
|
|
//
|
|
// Because Multiplicand * Multiplier overflows,
|
|
// Multiplicand * Multiplier / Divisor
|
|
// = (2 * Multiplicand' + 1) * Multiplier / Divisor
|
|
// = 2 * (Multiplicand' * Multiplier / Divisor) + Multiplier / Divisor
|
|
//
|
|
Uint64 = MultThenDivU64x64x32 (RShiftU64 (Multiplicand, 1), Multiplier, Divisor, &LocalRemainder);
|
|
Uint64 = LShiftU64 (Uint64, 1);
|
|
Uint32 = 0;
|
|
if ((Multiplicand & 0x1) == 1) {
|
|
Uint64 += DivU64x32Remainder (Multiplier, Divisor, &Uint32);
|
|
}
|
|
return Uint64 + DivU64x32Remainder (Uint32 + LShiftU64 (LocalRemainder, 1), Divisor, Remainder);
|
|
} else {
|
|
return DivU64x32Remainder (MultU64x64 (Multiplicand, Multiplier), Divisor, Remainder);
|
|
}
|
|
}
|