diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.S')
| -rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.S | 182 |
1 files changed, 91 insertions, 91 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.S b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.S index edf0dd7042..614bf2e6d0 100644 --- a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.S +++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.S @@ -1,91 +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 - +#---------------------------------------------------------------------------
+#/*++
+#
+#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
+
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