diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/RShiftU64.S')
| -rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/RShiftU64.S | 160 |
1 files changed, 80 insertions, 80 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/RShiftU64.S b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/RShiftU64.S index 7eba91298a..ef72231a31 100644 --- a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/RShiftU64.S +++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/RShiftU64.S @@ -1,80 +1,80 @@ -#/*++ -# -#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: -# -# RShiftU64.c -# -#Abstract: -# -# 64-bit right shift function for IA-32 -# -#--*/ -# -##include "Tiano.h" -# -#include "EfiBind.h" -#--------------------------------------------------------------------------- - .686: - #.MODEL flat,C - .code: - -#--------------------------------------------------------------------------- -.globl ASM_PFX(RShiftU64) -#UINT64 -#RShiftU64 ( -# IN UINT64 Operand, -# IN UINTN Count -# ) -#/*++ -# -#Routine Description: -# This routine allows a 64 bit value to be right shifted by 32 bits and returns the -# shifted value. -# Count is valid up 63. (Only Bits 0-5 is valid for Count) -#Arguments: -# Operand - Value to be shifted -# Count - Number of times to shift right. -# -#Returns: -# -# Value shifted right identified by the Count. -# -#--*/ -ASM_PFX(RShiftU64): - - movl 4(%esp), %eax # dword ptr Operand[0] - movl 8(%esp), %edx # dword ptr Operand[4] - - # - # CL is valid from 0 - 31. shld will move EDX:EAX by CL times but EDX is not touched - # For CL of 32 - 63, it will be shifted 0 - 31 so we will move edx to eax later. - # - movl 0xC(%esp), %ecx # Count - andl $63, %ecx - shrd %cl, %edx, %eax - shrb %cl, %edx - - cmpl $32, %ecx - jc _RShiftU64_Done - - # - # Since Count is 32 - 63, edx will have been shifted by 0 - 31 - # If shifted by 32 or more, set upper 32 bits to zero. - # - movl %edx, %eax - xorl %edx, %edx - -_RShiftU64_Done: - - ret -#RShiftU64 ENDP - +#/*++
+#
+#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:
+#
+# RShiftU64.c
+#
+#Abstract:
+#
+# 64-bit right shift function for IA-32
+#
+#--*/
+#
+##include "Tiano.h"
+#
+#include "EfiBind.h"
+#---------------------------------------------------------------------------
+ .686:
+ #.MODEL flat,C
+ .code:
+
+#---------------------------------------------------------------------------
+.globl ASM_PFX(RShiftU64)
+#UINT64
+#RShiftU64 (
+# IN UINT64 Operand,
+# IN UINTN Count
+# )
+#/*++
+#
+#Routine Description:
+# This routine allows a 64 bit value to be right shifted by 32 bits and returns the
+# shifted value.
+# Count is valid up 63. (Only Bits 0-5 is valid for Count)
+#Arguments:
+# Operand - Value to be shifted
+# Count - Number of times to shift right.
+#
+#Returns:
+#
+# Value shifted right identified by the Count.
+#
+#--*/
+ASM_PFX(RShiftU64):
+
+ movl 4(%esp), %eax # dword ptr Operand[0]
+ movl 8(%esp), %edx # dword ptr Operand[4]
+
+ #
+ # CL is valid from 0 - 31. shld will move EDX:EAX by CL times but EDX is not touched
+ # For CL of 32 - 63, it will be shifted 0 - 31 so we will move edx to eax later.
+ #
+ movl 0xC(%esp), %ecx # Count
+ andl $63, %ecx
+ shrd %cl, %edx, %eax
+ shrb %cl, %edx
+
+ cmpl $32, %ecx
+ jc _RShiftU64_Done
+
+ #
+ # Since Count is 32 - 63, edx will have been shifted by 0 - 31
+ # If shifted by 32 or more, set upper 32 bits to zero.
+ #
+ movl %edx, %eax
+ xorl %edx, %edx
+
+_RShiftU64_Done:
+
+ ret
+#RShiftU64 ENDP
+
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