mirror of https://github.com/acidanthera/audk.git
72 lines
2.0 KiB
ArmAsm
72 lines
2.0 KiB
ArmAsm
#/*++
|
|
#
|
|
#Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
|
|
#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
|
|
#
|
|
#--*/
|
|
#include "EfiBind.h"
|
|
#---------------------------------------------------------------------------
|
|
.686:
|
|
#.MODEL flat,C
|
|
.code:
|
|
|
|
#---------------------------------------------------------------------------
|
|
.globl ASM_PFX(MultU64x32)
|
|
#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
|
|
#
|
|
#--*/
|
|
ASM_PFX(MultU64x32):
|
|
|
|
movl 4(%esp), %eax # dword ptr Multiplicand[0]
|
|
mull 0xC(%esp) # Multiplier
|
|
pushl %eax
|
|
pushl %edx
|
|
movl 0x10(%esp), %eax # dword ptr Multiplicand[4]
|
|
mull 0x14(%esp) # 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.
|
|
#
|
|
popl %edx
|
|
addl %eax, %edx
|
|
popl %eax
|
|
|
|
ret
|
|
#MultU64x32 ENDP
|
|
|