mirror of https://github.com/acidanthera/audk.git
88 lines
2.9 KiB
NASM
88 lines
2.9 KiB
NASM
;---------------------------------------------------------------------------
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;/*++
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;
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;Copyright (c) 2006, Intel Corporation
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;All rights reserved. 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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; DivU64x32.c
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;
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;Abstract:
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;
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; 64-bit division function for IA-32
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;
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;--*/
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;---------------------------------------------------------------------------
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.386
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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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;DivU64x32 (
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; IN UINT64 Dividend,
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; IN UINTN Divisor,
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; OUT UINTN *Remainder OPTIONAL
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; )
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;/*++
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;Routine Description:
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; This routine allows a 64 bit value to be divided with a 32 bit value returns
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; 64bit result and the Remainder.
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;
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;Arguments:
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; Dividend - dividend
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; Divisor - divisor
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; Remainder - buffer for remainder
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;
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;Returns:
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; Dividend / Divisor
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; Remainder = Dividend mod Divisor
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;
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;N.B. only works for 31bit divisors!!
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;
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;--*/
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;---------------------------------------------------------------------------
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DivU64x32 PROC
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push ebp
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mov ebp, esp
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xor edx, edx ; Clear EDX
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mov eax, [ebp + 0Ch] ; Put high 32 bits of 64-bit dividend in EAX
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mov ecx, [ebp + 10h] ; Put 32 bits divisor in ECX
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div ecx ; Dividend Divisor Quoitent...Remainder
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; 0:EAX / ECX = EAX EDX
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push eax ; Push quoitent in stack
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mov eax, [ebp + 8] ; Put low 32 bits of 64-bit dividend in EAX
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div ecx ; Leave the REMAINDER in EDX as High 32-bit of new dividend
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; Dividend Divisor Quoitent...Remainder
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; EDX:EAX / ECX = EAX EDX
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mov ecx, [ebp + 14h] ; Put &REMAINDER to ecx
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jecxz Label1 ; If ecx == 0, no remainder exist, return with quoitent in EDX directly
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mov dword ptr [ecx], edx ; Put EDX through REMAINDER pointer in ECX
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Label1:
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pop edx ; Pop High 32-bit QUOITENT to EDX
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pop ebp
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ret
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DivU64x32 ENDP
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END
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