Add in .S file for GCC tool-chain.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5537 6f19259b-4bc3-4df7-8a09-765794883524

EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.S

@@ -0,0 +1,91 @@
+#---------------------------------------------------------------------------
+#/*++
+#
+#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:
+#
+#  DivU64x32.c
+#
+#Abstract:
+#
+#  64-bit division function for IA-32
+#
+#--*/
+
+#---------------------------------------------------------------------------
+#include "EfiBind.h" //For ASM_PFX
+#---------------------------------------------------------------------------
+
+#---------------------------------------------------------------------------
+    .386: 
+    .code: 
+
+#---------------------------------------------------------------------------
+
+.globl ASM_PFX(DivU64x32)
+
+#UINT64
+#DivU64x32 (
+#  IN UINT64   Dividend,
+#  IN UINTN    Divisor,
+#  OUT UINTN   *Remainder OPTIONAL
+#  )
+#/*++
+
+#Routine Description:
+
+#  This routine allows a 64 bit value to be divided with a 32 bit value returns 
+#  64bit result and the Remainder.
+#
+#Arguments:
+
+#  Dividend  - dividend
+#  Divisor   - divisor
+#  Remainder - buffer for remainder
+#  
+#Returns:
+
+#  Dividend  / Divisor
+#  Remainder = Dividend mod Divisor
+#  
+#N.B. only works for 31bit divisors!!
+#
+#--*/
+#---------------------------------------------------------------------------
+
+ASM_PFX(DivU64x32):
+    pushl %ebp
+    movl %esp, %ebp
+    xorl %edx, %edx                 # Clear EDX
+
+    movl 0xC(%ebp), %eax            # Put high 32 bits of 64-bit dividend in EAX
+    movl 0x10(%ebp), %ecx           # Put 32 bits divisor in ECX
+    divl %ecx                       # Dividend   Divisor  Quoitent...Remainder
+                                    #  0:EAX  /  ECX   =  EAX      EDX   
+
+    pushl %eax                      # Push quoitent in stack
+
+    movl 8(%ebp), %eax              # Put low 32 bits of 64-bit dividend in EAX              
+    divl %ecx                       # Leave the REMAINDER in EDX as High 32-bit of new dividend
+                                    # Dividend   Divisor  Quoitent...Remainder              
+                                    #  EDX:EAX  /  ECX   =  EAX      EDX               
+
+    movl 0x14(%ebp), %ecx            # Put &REMAINDER to ecx
+
+    jecxz Label1                    # If ecx == 0, no remainder exist, return with quoitent in EDX directly 
+    movl %edx, (%ecx)               # Put EDX through REMAINDER pointer in ECX 
+
+Label1: 
+    popl %edx                       # Pop High 32-bit QUOITENT to EDX
+    popl %ebp
+
+    ret
+