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50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/** @file
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Set error flag for all division functions
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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/**
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Divides a 64-bit unsigned integer by a 32-bit unsigned integer and
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generates a 64-bit unsigned result and an optional 32-bit unsigned remainder.
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This function divides the 64-bit unsigned value Dividend by the 32-bit
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unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder
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is not NULL, then the 32-bit unsigned remainder is returned in Remainder.
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This function returns the 64-bit unsigned quotient.
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@param Dividend A 64-bit unsigned value.
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@param Divisor A 32-bit unsigned value.
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@param Remainder A pointer to a 32-bit unsigned value. This parameter is
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optional and may be NULL.
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@return Dividend / Divisor
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**/
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UINT64
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EFIAPI
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InternalMathDivRemU64x32 (
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IN UINT64 Dividend,
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IN UINT32 Divisor,
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OUT UINT32 *Remainder
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)
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{
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_asm {
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mov ecx, Divisor
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mov eax, dword ptr [Dividend + 4]
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xor edx, edx
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div ecx
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push eax
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mov eax, dword ptr [Dividend + 0]
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div ecx
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mov ecx, Remainder
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jecxz RemainderNull // abandon remainder if Remainder == NULL
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mov [ecx], edx
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RemainderNull:
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pop edx
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}
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}
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