mirror of https://github.com/acidanthera/audk.git
71 lines
1.9 KiB
NASM
71 lines
1.9 KiB
NASM
;/*++
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;
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;Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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;This program and the accompanying materials
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;are licensed and made available under the terms and conditions of the BSD License
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;which accompanies this distribution. The full text of the license may be found at
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;http://opensource.org/licenses/bsd-license.php
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;
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;THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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;WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;Module Name:
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;
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; MultU64x32.c
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;
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;Abstract:
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;
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; 64-bit Multiplication function for IA-32
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;
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;--*/
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;---------------------------------------------------------------------------
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.686
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.model flat,C
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.code
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;---------------------------------------------------------------------------
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;UINT64
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;MultU64x32 (
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; IN UINT64 Multiplicand,
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; IN UINTN Multiplier
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; )
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;/*++
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;
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;Routine Description:
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;
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; This routine allows a 64 bit value to be multiplied with a 32 bit
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; value returns 64bit result.
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; No checking if the result is greater than 64bits
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;
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;Arguments:
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;
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; Multiplicand - multiplicand
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; Multiplier - multiplier
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;
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;Returns:
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;
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; Multiplicand * Multiplier
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;
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;--*/
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MultU64x32 PROC
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mov eax, [esp + 4]; dword ptr Multiplicand[0]
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mul dword ptr [esp + 0Ch] ; Multiplier
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push eax
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push edx
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mov eax, [esp + 10h]; dword ptr Multiplicand[4]
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mul dword ptr [esp + 14h]; Multiplier
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;
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; The value in edx stored by second multiplication overflows
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; the output and should be discarded. So here we overwrite it
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; with the edx value of first multiplication.
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;
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pop edx
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add edx, eax
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pop eax
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ret
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MultU64x32 ENDP
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END
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