1 /** @file
2 Calculate the product of a 64-bit integer and another 64-bit integer
3
4 Copyright (c) 2006 - 2010, 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
17
18 /**
19 Multiplies a 64-bit unsigned integer by a 64-bit unsigned integer
20 and generates a 64-bit unsigned result.
21
22 This function multiplies the 64-bit unsigned value Multiplicand by the 64-bit
23 unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
24 bit unsigned result is returned.
25
26 @param Multiplicand A 64-bit unsigned value.
27 @param Multiplier A 64-bit unsigned value.
28
29 @return Multiplicand * Multiplier
30
31 **/
32 UINT64
33 EFIAPI
InternalMathMultU64x64(IN UINT64 Multiplicand,IN UINT64 Multiplier)34 InternalMathMultU64x64 (
35 IN UINT64 Multiplicand,
36 IN UINT64 Multiplier
37 )
38 {
39 _asm {
40 mov ebx, dword ptr [Multiplicand + 0]
41 mov edx, dword ptr [Multiplier + 0]
42 mov ecx, ebx
43 mov eax, edx
44 imul ebx, dword ptr [Multiplier + 4]
45 imul edx, dword ptr [Multiplicand + 4]
46 add ebx, edx
47 mul ecx
48 add edx, ebx
49 }
50 }
51
52