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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/MultU64x64.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/MultU64x64.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/MultU64x64.c new file mode 100644 index 00000000..1ee9bbc3 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/MultU64x64.c @@ -0,0 +1,45 @@ +/** @file + Calculate the product of a 64-bit integer and another 64-bit integer + + Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + + + + +/** + Multiplies a 64-bit unsigned integer by a 64-bit unsigned integer + and generates a 64-bit unsigned result. + + This function multiplies the 64-bit unsigned value Multiplicand by the 64-bit + unsigned value Multiplier and generates a 64-bit unsigned result. This 64- + bit unsigned result is returned. + + @param Multiplicand A 64-bit unsigned value. + @param Multiplier A 64-bit unsigned value. + + @return Multiplicand * Multiplier + +**/ +UINT64 +EFIAPI +InternalMathMultU64x64 ( + IN UINT64 Multiplicand, + IN UINT64 Multiplier + ) +{ + _asm { + mov ebx, dword ptr [Multiplicand + 0] + mov edx, dword ptr [Multiplier + 0] + mov ecx, ebx + mov eax, edx + imul ebx, dword ptr [Multiplier + 4] + imul edx, dword ptr [Multiplicand + 4] + add ebx, edx + mul ecx + add edx, ebx + } +} + |