audk/MdePkg/Library/BaseLib/Ia32/DivU64x32.c

39 lines
1.1 KiB
C

/** @file
Calculate the quotient of a 64-bit integer by a 32-bit integer
Copyright (c) 2006 - 2007, Intel Corporation<BR>
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 common header file for this module.
//
#include "CommonHeader.h"
UINT64
EFIAPI
InternalMathDivU64x32 (
IN UINT64 Dividend,
IN UINT32 Divisor
)
{
_asm {
mov eax, dword ptr [Dividend + 4]
mov ecx, Divisor
xor edx, edx
div ecx
push eax ; save quotient on stack
mov eax, dword ptr [Dividend]
div ecx
pop edx ; restore high-order dword of the quotient
}
}