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MdePkg BaseMemoryLib: Add assembly implementation of API IsZeroBuffer() 

Add the implementation of API IsZeroBuffer() via assembly for the
following library instances:
BaseMemoryLibMmx
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
BaseMemoryLibRepStr

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Hao Wu 2016-08-17 14:26:25 +08:00
parent 1944b02b03
commit 02b5cf7fb1
20 changed files with 746 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
View File

@ -4,7 +4,7 @@
# Base Memory Library that uses MMX registers for high performance.
# Optimized for use in DXE.
#
# Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2006 - 2016, 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
@ -46,6 +46,7 @@
SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
IsZeroBufferWrapper.c
MemLibGuid.c
MemLibInternals.h
@ -94,6 +95,7 @@
Ia32/SetMem.asm
Ia32/CopyMem.nasm
Ia32/CopyMem.asm
Ia32/IsZeroBuffer.nasm
[Sources.X64]
X64/ZeroMem.nasm
@ -140,6 +142,7 @@
X64/SetMem.S
X64/CopyMem.nasm
X64/CopyMem.S
X64/IsZeroBuffer.nasm
[LibraryClasses]

55
MdePkg/Library/BaseMemoryLibMmx/Ia32/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push edi
mov edi, [esp + 8] ; edi <- Buffer
mov ecx, [esp + 12] ; ecx <- Length
mov edx, ecx ; edx <- ecx
shr ecx, 2 ; ecx <- number of dwords
and edx, 3 ; edx <- number of trailing bytes
xor eax, eax ; eax <- 0, also set ZF
repe scasd
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov ecx, edx
repe scasb
jnz @ReturnFalse
pop edi
mov eax, 1 ; return TRUE
ret
@ReturnFalse:
pop edi
xor eax, eax
ret ; return FALSE

54
MdePkg/Library/BaseMemoryLibMmx/IsZeroBufferWrapper.c Normal file
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@ -0,0 +1,54 @@
/** @file
Implementation of IsZeroBuffer function.
The following BaseMemoryLib instances contain the same copy of this file:
BaseMemoryLib
BaseMemoryLibMmx
BaseMemoryLibSse2
BaseMemoryLibRepStr
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
PeiMemoryLib
UefiMemoryLib
Copyright (c) 2016, 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.
**/
#include "MemLibInternals.h"
/**
Checks if the contents of a buffer are all zeros.
This function checks whether the contents of a buffer are all zeros. If the
contents are all zeros, return TRUE. Otherwise, return FALSE.
If Length > 0 and Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
IsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
)
{
ASSERT (!(Buffer == NULL && Length > 0));
ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
return InternalMemIsZeroBuffer (Buffer, Length);
}

19
MdePkg/Library/BaseMemoryLibMmx/MemLibInternals.h
View File

@ -9,7 +9,7 @@
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2016, 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
@ -231,4 +231,21 @@ InternalMemScanMem64 (
IN UINT64 Value
);
/**
Checks whether the contents of a buffer are all zeros.
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
InternalMemIsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
);
#endif

55
MdePkg/Library/BaseMemoryLibMmx/X64/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push rdi
mov rdi, rcx ; rdi <- Buffer
mov rcx, rdx ; rcx <- Length
shr rcx, 3 ; rcx <- number of qwords
and rdx, 7 ; rdx <- number of trailing bytes
xor rax, rax ; rax <- 0, also set ZF
repe scasq
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov rcx, rdx
repe scasb
jnz @ReturnFalse
pop rdi
mov rax, 1 ; return TRUE
ret
@ReturnFalse:
pop rdi
xor rax, rax
ret ; return FALSE

6
MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf
View File

@ -4,7 +4,7 @@
# Base Memory Library that is optimized for use in DXE phase.
# Uses REP, MMX, XMM registers as required for best performance.
#
# Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2007 - 2016, 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
@ -78,6 +78,7 @@
Ia32/SetMem.asm
Ia32/CopyMem.nasm
Ia32/CopyMem.asm
Ia32/IsZeroBuffer.nasm
ScanMem64Wrapper.c
ScanMem32Wrapper.c
ScanMem16Wrapper.c
@ -89,6 +90,7 @@
SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
IsZeroBufferWrapper.c
MemLibGuid.c
[Sources.X64]
@ -125,6 +127,7 @@
X64/CopyMem.nasm
X64/CopyMem.asm
X64/CopyMem.S
X64/IsZeroBuffer.nasm
ScanMem64Wrapper.c
ScanMem32Wrapper.c
ScanMem16Wrapper.c
@ -136,6 +139,7 @@
SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
IsZeroBufferWrapper.c
MemLibGuid.c
[Packages]

55
MdePkg/Library/BaseMemoryLibOptDxe/Ia32/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push edi
mov edi, [esp + 8] ; edi <- Buffer
mov ecx, [esp + 12] ; ecx <- Length
mov edx, ecx ; edx <- ecx
shr ecx, 2 ; ecx <- number of dwords
and edx, 3 ; edx <- number of trailing bytes
xor eax, eax ; eax <- 0, also set ZF
repe scasd
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov ecx, edx
repe scasb
jnz @ReturnFalse
pop edi
mov eax, 1 ; return TRUE
ret
@ReturnFalse:
pop edi
xor eax, eax
ret ; return FALSE

54
MdePkg/Library/BaseMemoryLibOptDxe/IsZeroBufferWrapper.c Normal file
View File

@ -0,0 +1,54 @@
/** @file
Implementation of IsZeroBuffer function.
The following BaseMemoryLib instances contain the same copy of this file:
BaseMemoryLib
BaseMemoryLibMmx
BaseMemoryLibSse2
BaseMemoryLibRepStr
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
PeiMemoryLib
UefiMemoryLib
Copyright (c) 2016, 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.
**/
#include "MemLibInternals.h"
/**
Checks if the contents of a buffer are all zeros.
This function checks whether the contents of a buffer are all zeros. If the
contents are all zeros, return TRUE. Otherwise, return FALSE.
If Length > 0 and Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
IsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
)
{
ASSERT (!(Buffer == NULL && Length > 0));
ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
return InternalMemIsZeroBuffer (Buffer, Length);
}

19
MdePkg/Library/BaseMemoryLibOptDxe/MemLibInternals.h
View File

@ -9,7 +9,7 @@
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2016, 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
@ -231,4 +231,21 @@ InternalMemScanMem64 (
IN UINT64 Value
);
/**
Checks whether the contents of a buffer are all zeros.
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
InternalMemIsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
);
#endif

55
MdePkg/Library/BaseMemoryLibOptDxe/X64/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push rdi
mov rdi, rcx ; rdi <- Buffer
mov rcx, rdx ; rcx <- Length
shr rcx, 3 ; rcx <- number of qwords
and rdx, 7 ; rdx <- number of trailing bytes
xor rax, rax ; rax <- 0, also set ZF
repe scasq
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov rcx, rdx
repe scasb
jnz @ReturnFalse
pop rdi
mov rax, 1 ; return TRUE
ret
@ReturnFalse:
pop rdi
xor rax, rax
ret ; return FALSE

6
MdePkg/Library/BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf
View File

@ -4,7 +4,7 @@
# Base Memory Library that is optimized for use in PEI phase.
# Uses REP, MMX, XMM registers as required for best performance.
#
# Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2007 - 2016, 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
@ -78,6 +78,7 @@
Ia32/SetMem.asm
Ia32/CopyMem.nasm
Ia32/CopyMem.asm
Ia32/IsZeroBuffer.nasm
ScanMem64Wrapper.c
ScanMem32Wrapper.c
ScanMem16Wrapper.c
@ -89,6 +90,7 @@
SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
IsZeroBufferWrapper.c
MemLibGuid.c
[Sources.X64]
@ -125,6 +127,7 @@
X64/CopyMem.nasm
X64/CopyMem.asm
X64/CopyMem.S
X64/IsZeroBuffer.nasm
ScanMem64Wrapper.c
ScanMem32Wrapper.c
ScanMem16Wrapper.c
@ -136,6 +139,7 @@
SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
IsZeroBufferWrapper.c
MemLibGuid.c

55
MdePkg/Library/BaseMemoryLibOptPei/Ia32/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push edi
mov edi, [esp + 8] ; edi <- Buffer
mov ecx, [esp + 12] ; ecx <- Length
mov edx, ecx ; edx <- ecx
shr ecx, 2 ; ecx <- number of dwords
and edx, 3 ; edx <- number of trailing bytes
xor eax, eax ; eax <- 0, also set ZF
repe scasd
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov ecx, edx
repe scasb
jnz @ReturnFalse
pop edi
mov eax, 1 ; return TRUE
ret
@ReturnFalse:
pop edi
xor eax, eax
ret ; return FALSE

54
MdePkg/Library/BaseMemoryLibOptPei/IsZeroBufferWrapper.c Normal file
View File

@ -0,0 +1,54 @@
/** @file
Implementation of IsZeroBuffer function.
The following BaseMemoryLib instances contain the same copy of this file:
BaseMemoryLib
BaseMemoryLibMmx
BaseMemoryLibSse2
BaseMemoryLibRepStr
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
PeiMemoryLib
UefiMemoryLib
Copyright (c) 2016, 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.
**/
#include "MemLibInternals.h"
/**
Checks if the contents of a buffer are all zeros.
This function checks whether the contents of a buffer are all zeros. If the
contents are all zeros, return TRUE. Otherwise, return FALSE.
If Length > 0 and Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
IsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
)
{
ASSERT (!(Buffer == NULL && Length > 0));
ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
return InternalMemIsZeroBuffer (Buffer, Length);
}

19
MdePkg/Library/BaseMemoryLibOptPei/MemLibInternals.h
View File

@ -9,7 +9,7 @@
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2016, 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
@ -231,4 +231,21 @@ InternalMemScanMem64 (
IN UINT64 Value
);
/**
Checks whether the contents of a buffer are all zeros.
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
InternalMemIsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
);
#endif

55
MdePkg/Library/BaseMemoryLibOptPei/X64/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push rdi
mov rdi, rcx ; rdi <- Buffer
mov rcx, rdx ; rcx <- Length
shr rcx, 3 ; rcx <- number of qwords
and rdx, 7 ; rdx <- number of trailing bytes
xor rax, rax ; rax <- 0, also set ZF
repe scasq
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov rcx, rdx
repe scasb
jnz @ReturnFalse
pop rdi
mov rax, 1 ; return TRUE
ret
@ReturnFalse:
pop rdi
xor rax, rax
ret ; return FALSE

5
MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
View File

@ -4,7 +4,7 @@
# Base Memory Library that uses REP string instructions for
# high performance and small size. Optimized for use in PEI.
#
# Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2007 - 2016, 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
@ -43,6 +43,7 @@
SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
IsZeroBufferWrapper.c
MemLibGuid.c
[Sources.Ia32]
@ -90,6 +91,7 @@
Ia32/SetMem.asm
Ia32/CopyMem.nasm
Ia32/CopyMem.asm
Ia32/IsZeroBuffer.nasm
[Sources.X64]
X64/ScanMem64.nasm
@ -136,6 +138,7 @@
X64/SetMem.asm
X64/CopyMem.nasm
X64/CopyMem.asm
X64/IsZeroBuffer.nasm
[Packages]
MdePkg/MdePkg.dec

55
MdePkg/Library/BaseMemoryLibRepStr/Ia32/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push edi
mov edi, [esp + 8] ; edi <- Buffer
mov ecx, [esp + 12] ; ecx <- Length
mov edx, ecx ; edx <- ecx
shr ecx, 2 ; ecx <- number of dwords
and edx, 3 ; edx <- number of trailing bytes
xor eax, eax ; eax <- 0, also set ZF
repe scasd
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov ecx, edx
repe scasb
jnz @ReturnFalse
pop edi
mov eax, 1 ; return TRUE
ret
@ReturnFalse:
pop edi
xor eax, eax
ret ; return FALSE

54
MdePkg/Library/BaseMemoryLibRepStr/IsZeroBufferWrapper.c Normal file
View File

@ -0,0 +1,54 @@
/** @file
Implementation of IsZeroBuffer function.
The following BaseMemoryLib instances contain the same copy of this file:
BaseMemoryLib
BaseMemoryLibMmx
BaseMemoryLibSse2
BaseMemoryLibRepStr
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
PeiMemoryLib
UefiMemoryLib
Copyright (c) 2016, 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.
**/
#include "MemLibInternals.h"
/**
Checks if the contents of a buffer are all zeros.
This function checks whether the contents of a buffer are all zeros. If the
contents are all zeros, return TRUE. Otherwise, return FALSE.
If Length > 0 and Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
IsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
)
{
ASSERT (!(Buffer == NULL && Length > 0));
ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
return InternalMemIsZeroBuffer (Buffer, Length);
}

19
MdePkg/Library/BaseMemoryLibRepStr/MemLibInternals.h
View File

@ -9,7 +9,7 @@
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2016, 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
@ -231,4 +231,21 @@ InternalMemScanMem64 (
IN UINT64 Value
);
/**
Checks whether the contents of a buffer are all zeros.
@param Buffer The pointer to the buffer to be checked.
@param Length The size of the buffer (in bytes) to be checked.
@retval TRUE Contents of the buffer are all zeros.
@retval FALSE Contents of the buffer are not all zeros.
**/
BOOLEAN
EFIAPI
InternalMemIsZeroBuffer (
IN CONST VOID *Buffer,
IN UINTN Length
);
#endif

55
MdePkg/Library/BaseMemoryLibRepStr/X64/IsZeroBuffer.nasm Normal file
View File

@ -0,0 +1,55 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2016, 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:
;
; IsZeroBuffer.nasm
;
; Abstract:
;
; IsZeroBuffer function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; BOOLEAN
; EFIAPI
; InternalMemIsZeroBuffer (
; IN CONST VOID *Buffer,
; IN UINTN Length
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemIsZeroBuffer)
ASM_PFX(InternalMemIsZeroBuffer):
push rdi
mov rdi, rcx ; rdi <- Buffer
mov rcx, rdx ; rcx <- Length
shr rcx, 3 ; rcx <- number of qwords
and rdx, 7 ; rdx <- number of trailing bytes
xor rax, rax ; rax <- 0, also set ZF
repe scasq
jnz @ReturnFalse ; ZF=0 means non-zero element found
mov rcx, rdx
repe scasb
jnz @ReturnFalse
pop rdi
mov rax, 1 ; return TRUE
ret
@ReturnFalse:
pop rdi
xor rax, rax
ret ; return FALSE