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https://github.com/CloverHackyColor/CloverBootloader.git
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41 lines
1.4 KiB
NASM
41 lines
1.4 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, 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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; Module Name:
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;
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; MultU64x64.nasm
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;
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; Abstract:
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;
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; Calculate the product of a 64-bit integer and another 64-bit integer
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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; UINT64
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; EFIAPI
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; InternalMathMultU64x64 (
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; IN UINT64 Multiplicand,
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; IN UINT64 Multiplier
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalMathMultU64x64)
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ASM_PFX(InternalMathMultU64x64):
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push ebx
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mov ebx, [esp + 8] ; ebx <- M1[0..31]
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mov edx, [esp + 16] ; edx <- M2[0..31]
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mov ecx, ebx
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mov eax, edx
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imul ebx, [esp + 20] ; ebx <- M1[0..31] * M2[32..63]
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imul edx, [esp + 12] ; edx <- M1[32..63] * M2[0..31]
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add ebx, edx ; carries are abandoned
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mul ecx ; edx:eax <- M1[0..31] * M2[0..31]
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add edx, ebx ; carries are abandoned
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pop ebx
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ret
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