1 /** @file
2 Set error flag for all division functions
3
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php.
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 /**
16 Divides a 64-bit unsigned integer by a 32-bit unsigned integer and
17 generates a 64-bit unsigned result and an optional 32-bit unsigned remainder.
18
19 This function divides the 64-bit unsigned value Dividend by the 32-bit
20 unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder
21 is not NULL, then the 32-bit unsigned remainder is returned in Remainder.
22 This function returns the 64-bit unsigned quotient.
23
24 @param Dividend A 64-bit unsigned value.
25 @param Divisor A 32-bit unsigned value.
26 @param Remainder A pointer to a 32-bit unsigned value. This parameter is
27 optional and may be NULL.
28
29 @return Dividend / Divisor
30
31 **/
32 UINT64
33 EFIAPI
InternalMathDivRemU64x32(IN UINT64 Dividend,IN UINT32 Divisor,OUT UINT32 * Remainder)34 InternalMathDivRemU64x32 (
35 IN UINT64 Dividend,
36 IN UINT32 Divisor,
37 OUT UINT32 *Remainder
38 )
39 {
40 _asm {
41 mov ecx, Divisor
42 mov eax, dword ptr [Dividend + 4]
43 xor edx, edx
44 div ecx
45 push eax
46 mov eax, dword ptr [Dividend + 0]
47 div ecx
48 mov ecx, Remainder
49 jecxz RemainderNull // abandon remainder if Remainder == NULL
50 mov [ecx], edx
51 RemainderNull:
52 pop edx
53 }
54 }
55
56