diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/LShiftU64.S')
| -rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/LShiftU64.S | 164 |
1 files changed, 82 insertions, 82 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/LShiftU64.S b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/LShiftU64.S index 13ac2026f9..c9a978bed1 100644 --- a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/LShiftU64.S +++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/LShiftU64.S @@ -1,82 +1,82 @@ -#/*++ -# -#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: -# -# LShiftU64.c -# -#Abstract: -# -# 64-bit left shift function for IA-32 -# -#--*/ -# -#include "EfiBind.h" -#--------------------------------------------------------------------------- - .686: - #.MODEL flat,C - .code: - -#--------------------------------------------------------------------------- -.globl ASM_PFX(LShiftU64) -# -#UINT64 -#LShiftU64 ( -# IN UINT64 Operand, -# IN UINTN Count -# ) -#/*++ -# -#Routine Description: -# -# This routine allows a 64 bit value to be left 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 left. -# -#Returns: -# -# Value shifted left identified by the Count. -# -#--*/ -ASM_PFX(LShiftU64): - - 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 EAX is not touched - # For CL of 32 - 63, it will be shifted 0 - 31 so we will move eax to edx later. - # - movl 0xC(%esp), %ecx # Count - andl $63, %ecx - shld %cl, %eax, %edx - shlb %cl, %eax - - # - # Since Count is 32 - 63, eax will have been shifted by 0 - 31 - # If shifted by 32 or more, set lower 32 bits to zero. - # - cmpl $32, %ecx - jc _LShiftU64_Done - - movl %eax, %edx - xorl %eax, %eax - -_LShiftU64_Done: - - ret -#LShiftU64 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:
+#
+# LShiftU64.c
+#
+#Abstract:
+#
+# 64-bit left shift function for IA-32
+#
+#--*/
+#
+#include "EfiBind.h"
+#---------------------------------------------------------------------------
+ .686:
+ #.MODEL flat,C
+ .code:
+
+#---------------------------------------------------------------------------
+.globl ASM_PFX(LShiftU64)
+#
+#UINT64
+#LShiftU64 (
+# IN UINT64 Operand,
+# IN UINTN Count
+# )
+#/*++
+#
+#Routine Description:
+#
+# This routine allows a 64 bit value to be left 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 left.
+#
+#Returns:
+#
+# Value shifted left identified by the Count.
+#
+#--*/
+ASM_PFX(LShiftU64):
+
+ 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 EAX is not touched
+ # For CL of 32 - 63, it will be shifted 0 - 31 so we will move eax to edx later.
+ #
+ movl 0xC(%esp), %ecx # Count
+ andl $63, %ecx
+ shld %cl, %eax, %edx
+ shlb %cl, %eax
+
+ #
+ # Since Count is 32 - 63, eax will have been shifted by 0 - 31
+ # If shifted by 32 or more, set lower 32 bits to zero.
+ #
+ cmpl $32, %ecx
+ jc _LShiftU64_Done
+
+ movl %eax, %edx
+ xorl %eax, %eax
+
+_LShiftU64_Done:
+
+ ret
+#LShiftU64 ENDP
+
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