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