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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 14/29] MdePkg/BaseSynchronizationLib: implement 16-bit compare-exchange
On 17 February 2015 at 18:40, Jordan Justen <jordan.l.justen@xxxxxxxxx> wrote:
> Ard,
>
> For the subject, I think
> MdePkg/BaseSynchronizationLib: Add InterlockedCompareExchange16
> would be better.
>
OK
> Acked-by: Jordan Justen <jordan.l.justen@xxxxxxxxx>
>
Thanks
> Thanks for working to move this to a common location.
>
No problem
> Mike,
>
> I think Anthony tested the IA32 and X64 implementations with Xen. For
> IPF, I don't think it has been tested.
>
As mentioned in the other thread, Anthony seems to be incommunicado,
and some other of the Xen guys have replied that Xen on OVMF/x86 is
broken for other reasons so they cannot positively confirm that
everything still works, even though the x86 changes other than the
PCI/xenbus split are primarily refactoring of existing code.
As far as IPF is concerned: I don't think Xen or Ovmf can be built for
IPF anyway, but I think a build test and visual inspection of the .S
file should be sufficient here?
Thanks,
Ard.
> On 2015-02-12 03:19:06, Ard Biesheuvel wrote:
>> This implements the function InterlockedCompareExchange16 () for all
>> architectures, using architecture and toolchain specific intrinsics
>> or primitive assembler instructions.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.0
>> Reviewed-by: Olivier Martin <olivier.martin@xxxxxxx>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
>> ---
>> MdePkg/Include/Library/SynchronizationLib.h
>> | 26 ++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
>> | 44 ++++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.S
>> | 44 ++++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.asm
>> | 44 ++++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
>> | 5 +++++
>> MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h
>> | 26 ++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
>> | 31 +++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c
>> | 42 ++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.asm
>> | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c
>> | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Ipf/InterlockedCompareExchange16.s
>> | 30 ++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/Synchronization.c
>> | 31 +++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c
>> | 31 +++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c
>> | 31 +++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c
>> | 44 ++++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm
>> | 42 ++++++++++++++++++++++++++++++++++++++++++
>> MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c
>> | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> 17 files changed, 622 insertions(+)
>>
>> diff --git a/MdePkg/Include/Library/SynchronizationLib.h
>> b/MdePkg/Include/Library/SynchronizationLib.h
>> index f97569739914..7b97683ca0af 100644
>> --- a/MdePkg/Include/Library/SynchronizationLib.h
>> +++ b/MdePkg/Include/Library/SynchronizationLib.h
>> @@ -184,6 +184,32 @@ InterlockedDecrement (
>>
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + If Value is NULL, then ASSERT().
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +**/
>> +UINT16
>> +EFIAPI
>> +InterlockedCompareExchange16 (
>> + IN OUT UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + );
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
>> b/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
>> index 601b00495f26..ecb87fc12755 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
>> +++ b/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
>> @@ -16,12 +16,56 @@
>> .text
>> .align 3
>>
>> +GCC_ASM_EXPORT(InternalSyncCompareExchange16)
>> GCC_ASM_EXPORT(InternalSyncCompareExchange32)
>> GCC_ASM_EXPORT(InternalSyncCompareExchange64)
>> GCC_ASM_EXPORT(InternalSyncIncrement)
>> GCC_ASM_EXPORT(InternalSyncDecrement)
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +//UINT16
>> +//EFIAPI
>> +//InternalSyncCompareExchange16 (
>> +// IN volatile UINT16 *Value,
>> +// IN UINT16 CompareValue,
>> +// IN UINT16 ExchangeValue
>> +// )
>> +ASM_PFX(InternalSyncCompareExchange16):
>> + uxth w1, w1
>> + uxth w2, w2
>> + dmb sy
>> +
>> +InternalSyncCompareExchange16Again:
>> + ldxrh w3, [x0]
>> + cmp w3, w1
>> + bne InternalSyncCompareExchange16Fail
>> +
>> +InternalSyncCompareExchange16Exchange:
>> + stxrh w4, w2, [x0]
>> + cbnz w4, InternalSyncCompareExchange16Again
>> +
>> +InternalSyncCompareExchange16Fail:
>> + dmb sy
>> + mov w0, w3
>> + ret
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.S
>> b/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.S
>> index 0128f8f016bd..d699eb40d2a2 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.S
>> +++ b/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.S
>> @@ -1,6 +1,7 @@
>> // Implementation of synchronization functions for ARM architecture
>> //
>> // Copyright (c) 2012-2015, ARM Limited. All rights reserved.
>> +// Copyright (c) 2015, Linaro Limited. All rights reserved.
>> //
>> // This program and the accompanying materials
>> // are licensed and made available under the terms and conditions of the
>> BSD License
>> @@ -15,12 +16,55 @@
>> .text
>> .align 3
>>
>> +GCC_ASM_EXPORT(InternalSyncCompareExchange16)
>> GCC_ASM_EXPORT(InternalSyncCompareExchange32)
>> GCC_ASM_EXPORT(InternalSyncCompareExchange64)
>> GCC_ASM_EXPORT(InternalSyncIncrement)
>> GCC_ASM_EXPORT(InternalSyncDecrement)
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +//UINT16
>> +//EFIAPI
>> +//InternalSyncCompareExchange16 (
>> +// IN volatile UINT16 *Value,
>> +// IN UINT16 CompareValue,
>> +// IN UINT16 ExchangeValue
>> +// )
>> +ASM_PFX(InternalSyncCompareExchange16):
>> + dmb
>> +
>> +InternalSyncCompareExchange16Again:
>> + ldrexh r3, [r0]
>> + cmp r3, r1
>> + bne InternalSyncCompareExchange16Fail
>> +
>> +InternalSyncCompareExchange16Exchange:
>> + strexh ip, r2, [r0]
>> + cmp ip, #0
>> + bne InternalSyncCompareExchange16Again
>> +
>> +InternalSyncCompareExchange16Fail:
>> + dmb
>> + mov r0, r3
>> + bx lr
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.asm
>> b/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.asm
>> index f9f80737774a..dbc599114093 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.asm
>> +++ b/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.asm
>> @@ -1,6 +1,7 @@
>> // Implementation of synchronization functions for ARM architecture
>> //
>> // Copyright (c) 2012-2015, ARM Limited. All rights reserved.
>> +// Copyright (c) 2015, Linaro Limited. All rights reserved.
>> //
>> // This program and the accompanying materials
>> // are licensed and made available under the terms and conditions of the
>> BSD License
>> @@ -12,6 +13,7 @@
>> //
>> //
>>
>> + EXPORT InternalSyncCompareExchange16
>> EXPORT InternalSyncCompareExchange32
>> EXPORT InternalSyncCompareExchange64
>> EXPORT InternalSyncIncrement
>> @@ -20,6 +22,48 @@
>> AREA ArmSynchronization, CODE, READONLY
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +//UINT16
>> +//EFIAPI
>> +//InternalSyncCompareExchange16 (
>> +// IN volatile UINT16 *Value,
>> +// IN UINT16 CompareValue,
>> +// IN UINT16 ExchangeValue
>> +// )
>> +InternalSyncCompareExchange16
>> + dmb
>> +
>> +InternalSyncCompareExchange16Again
>> + ldrexh r3, [r0]
>> + cmp r3, r1
>> + bne InternalSyncCompareExchange16Fail
>> +
>> +InternalSyncCompareExchange16Exchange
>> + strexh ip, r2, [r0]
>> + cmp ip, #0
>> + bne InternalSyncCompareExchange16Again
>> +
>> +InternalSyncCompareExchange16Fail
>> + dmb
>> + mov r0, r3
>> + bx lr
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git
>> a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
>> b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
>> index 5e3b4e6b9bf2..bd1bec3fb5e7 100755
>> --- a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
>> +++ b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
>> @@ -32,12 +32,14 @@
>> [Sources.IA32]
>> Ia32/InterlockedCompareExchange64.c | MSFT
>> Ia32/InterlockedCompareExchange32.c | MSFT
>> + Ia32/InterlockedCompareExchange16.c | MSFT
>> Ia32/InterlockedDecrement.c | MSFT
>> Ia32/InterlockedIncrement.c | MSFT
>> SynchronizationMsc.c | MSFT
>>
>> Ia32/InterlockedCompareExchange64.asm | INTEL
>> Ia32/InterlockedCompareExchange32.asm | INTEL
>> + Ia32/InterlockedCompareExchange16.asm | INTEL
>> Ia32/InterlockedDecrement.asm | INTEL
>> Ia32/InterlockedIncrement.asm | INTEL
>> Synchronization.c | INTEL
>> @@ -48,9 +50,11 @@
>> [Sources.X64]
>> X64/InterlockedCompareExchange64.c | MSFT
>> X64/InterlockedCompareExchange32.c | MSFT
>> + X64/InterlockedCompareExchange16.c | MSFT
>>
>> X64/InterlockedCompareExchange64.asm | INTEL
>> X64/InterlockedCompareExchange32.asm | INTEL
>> + X64/InterlockedCompareExchange16.asm | INTEL
>>
>> X64/InterlockedDecrement.c | MSFT
>> X64/InterlockedIncrement.c | MSFT
>> @@ -67,6 +71,7 @@
>> Ipf/Synchronization.c
>> Ipf/InterlockedCompareExchange64.s
>> Ipf/InterlockedCompareExchange32.s
>> + Ipf/InterlockedCompareExchange16.s
>>
>> Synchronization.c | INTEL
>> SynchronizationMsc.c | MSFT
>> diff --git
>> a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h
>> b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h
>> index e42824c75d12..76f702324156 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h
>> +++ b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h
>> @@ -63,6 +63,32 @@ InternalSyncDecrement (
>>
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue A 16-bit value used in compare operation.
>> + @param ExchangeValue A 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InternalSyncCompareExchange16 (
>> + IN volatile UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + );
>> +
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
>> b/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
>> index 9c34b9f128ed..a57860203b12 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
>> +++ b/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
>> @@ -13,6 +13,37 @@
>> **/
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit
>> + unsigned integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit
>> + unsigned integer specified by Value. If Value is equal to
>> + CompareValue, then Value is set to ExchangeValue and
>> + CompareValue is returned. If Value is not equal to
>> + CompareValue, then Value is returned. The compare exchange
>> + operation must be performed using MP safe mechanisms.
>> +
>> + @param Value A pointer to the 16-bit value for the
>> + compare exchange operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InternalSyncCompareExchange16 (
>> + IN volatile UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> + return *Value != CompareValue ? *Value :
>> + ((*Value = ExchangeValue), CompareValue);
>> +}
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit
>> unsigned integer.
>>
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c
>> b/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c
>> index b5a7827fc0e8..bd81aad6c243 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c
>> +++ b/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c
>> @@ -88,6 +88,48 @@ InternalSyncDecrement (
>> }
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InternalSyncCompareExchange16 (
>> + IN OUT volatile UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> +
>> + __asm__ __volatile__ (
>> + " \n "
>> + "lock \n "
>> + "cmpxchgw %1, %2 \n "
>> + : "=a" (CompareValue)
>> + : "q" (ExchangeValue),
>> + "m" (*Value),
>> + "0" (CompareValue)
>> + : "memory",
>> + "cc"
>> + );
>> +
>> + return CompareValue;
>> +}
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git
>> a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.asm
>>
>> b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.asm
>> new file mode 100644
>> index 000000000000..f8705042661d
>> --- /dev/null
>> +++
>> b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.asm
>> @@ -0,0 +1,46 @@
>> +;------------------------------------------------------------------------------
>> +;
>> +; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
>> +; Copyright (c) 2015, Linaro Ltd. 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:
>> +;
>> +; InterlockedCompareExchange16.Asm
>> +;
>> +; Abstract:
>> +;
>> +; InterlockedCompareExchange16 function
>> +;
>> +; Notes:
>> +;
>> +;------------------------------------------------------------------------------
>> +
>> + .486
>> + .model flat,C
>> + .code
>> +
>> +;------------------------------------------------------------------------------
>> +; UINT16
>> +; EFIAPI
>> +; InternalSyncCompareExchange16 (
>> +; IN UINT16 *Value,
>> +; IN UINT16 CompareValue,
>> +; IN UINT16 ExchangeValue
>> +; );
>> +;------------------------------------------------------------------------------
>> +InternalSyncCompareExchange16 PROC
>> + mov ecx, [esp + 4]
>> + mov eax, [esp + 8]
>> + mov edx, [esp + 12]
>> + lock cmpxchg [ecx], dx
>> + ret
>> +InternalSyncCompareExchange16 ENDP
>> +
>> + END
>> diff --git
>> a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c
>> b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c
>> new file mode 100644
>> index 000000000000..3d06dd9baa63
>> --- /dev/null
>> +++
>> b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c
>> @@ -0,0 +1,51 @@
>> +/** @file
>> + InterlockedCompareExchange16 function
>> +
>> + Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
>> + Copyright (c) 2015, Linaro Ltd. 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.
>> +
>> +**/
>> +
>> +
>> +
>> +
>> +/**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InternalSyncCompareExchange16 (
>> + IN UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> + _asm {
>> + mov ecx, Value
>> + mov eax, CompareValue
>> + mov edx, ExchangeValue
>> + lock cmpxchg [ecx], dx
>> + }
>> +}
>> +
>> diff --git
>> a/MdePkg/Library/BaseSynchronizationLib/Ipf/InterlockedCompareExchange16.s
>> b/MdePkg/Library/BaseSynchronizationLib/Ipf/InterlockedCompareExchange16.s
>> new file mode 100644
>> index 000000000000..1e56942a98cb
>> --- /dev/null
>> +++
>> b/MdePkg/Library/BaseSynchronizationLib/Ipf/InterlockedCompareExchange16.s
>> @@ -0,0 +1,30 @@
>> +/// @file
>> +/// Contains an implementation of InterlockedCompareExchange16 on Itanium-
>> +/// based architecture.
>> +///
>> +/// Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
>> +/// Copyright (c) 2015, Linaro Ltd. 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: InterlockedCompareExchange16.s
>> +///
>> +///
>> +
>> +.auto
>> +.text
>> +
>> +.proc InternalSyncCompareExchange16
>> +.type InternalSyncCompareExchange16, @function
>> +InternalSyncCompareExchange16::
>> + zxt2 r33 = r33
>> + mov ar.ccv = r33
>> + cmpxchg2.rel r8 = [r32], r34
>> + mf
>> + br.ret.sptk.many b0
>> +.endp InternalSyncCompareExchange16
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/Synchronization.c
>> b/MdePkg/Library/BaseSynchronizationLib/Synchronization.c
>> index 0eea40ba1622..4218a265a0ec 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/Synchronization.c
>> +++ b/MdePkg/Library/BaseSynchronizationLib/Synchronization.c
>> @@ -277,6 +277,37 @@ InterlockedDecrement (
>> }
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + If Value is NULL, then ASSERT().
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InterlockedCompareExchange16 (
>> + IN OUT UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> + ASSERT (Value != NULL);
>> + return InternalSyncCompareExchange16 (Value, CompareValue, ExchangeValue);
>> +}
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c
>> b/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c
>> index badf73c1a6ce..587f5a771c35 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c
>> +++ b/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c
>> @@ -293,6 +293,37 @@ InterlockedDecrement (
>> }
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + If Value is NULL, then ASSERT().
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue A 16-bit value used in compare operation.
>> + @param ExchangeValue A 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InterlockedCompareExchange16 (
>> + IN OUT UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> + ASSERT (Value != NULL);
>> + return InternalSyncCompareExchange16 (Value, CompareValue, ExchangeValue);
>> +}
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c
>> b/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c
>> index 9b20236acfa6..ca21f5dccee5 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c
>> +++ b/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c
>> @@ -295,6 +295,37 @@ InterlockedDecrement (
>> }
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> + If Value is NULL, then ASSERT().
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue A 16-bit value used in a compare operation.
>> + @param ExchangeValue A 16-bit value used in an exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InterlockedCompareExchange16 (
>> + IN OUT UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> + ASSERT (Value != NULL);
>> + return InternalSyncCompareExchange16 (Value, CompareValue, ExchangeValue);
>> +}
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c
>> b/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c
>> index ceb80aed94f8..6347073fee51 100644
>> --- a/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c
>> +++ b/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c
>> @@ -89,6 +89,50 @@ InternalSyncDecrement (
>>
>>
>> /**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer
>> + specified by Value. If Value is equal to CompareValue, then Value is set
>> to
>> + ExchangeValue and CompareValue is returned. If Value is not equal to
>> CompareValue,
>> + then Value is returned. The compare exchange operation must be performed
>> using
>> + MP safe mechanisms.
>> +
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InternalSyncCompareExchange16 (
>> + IN OUT volatile UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> +
>> +
>> + __asm__ __volatile__ (
>> + "lock \n "
>> + "cmpxchgw %3, %1 "
>> + : "=a" (CompareValue),
>> + "=m" (*Value)
>> + : "a" (CompareValue),
>> + "r" (ExchangeValue),
>> + "m" (*Value)
>> + : "memory",
>> + "cc"
>> + );
>> +
>> + return CompareValue;
>> +}
>> +
>> +
>> +/**
>> Performs an atomic compare exchange operation on a 32-bit unsigned
>> integer.
>>
>> Performs an atomic compare exchange operation on the 32-bit unsigned
>> integer
>> diff --git
>> a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm
>> b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm
>> new file mode 100644
>> index 000000000000..8fe2aae1a28b
>> --- /dev/null
>> +++
>> b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm
>> @@ -0,0 +1,42 @@
>> +;------------------------------------------------------------------------------
>> +;
>> +; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
>> +; Copyright (c) 2015, Linaro Ltd. 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:
>> +;
>> +; InterlockedCompareExchange16.Asm
>> +;
>> +; Abstract:
>> +;
>> +; InterlockedCompareExchange16 function
>> +;
>> +; Notes:
>> +;
>> +;------------------------------------------------------------------------------
>> +
>> + .code
>> +
>> +;------------------------------------------------------------------------------
>> +; UINT16
>> +; EFIAPI
>> +; InterlockedCompareExchange16 (
>> +; IN UINT16 *Value,
>> +; IN UINT16 CompareValue,
>> +; IN UINT16 ExchangeValue
>> +; );
>> +;------------------------------------------------------------------------------
>> +InternalSyncCompareExchange16 PROC
>> + mov eax, edx
>> + lock cmpxchg [rcx], r8w
>> + ret
>> +InternalSyncCompareExchange16 ENDP
>> +
>> + END
>> diff --git
>> a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c
>> b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c
>> new file mode 100644
>> index 000000000000..76aa6fbc0e81
>> --- /dev/null
>> +++
>> b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c
>> @@ -0,0 +1,54 @@
>> +/** @file
>> + InterlockedCompareExchange16 function
>> +
>> + Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
>> + Copyright (c) 2015, Linaro Ltd. 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.
>> +
>> +**/
>> +
>> +/**
>> + Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
>> +**/
>> +
>> +__int16 _InterlockedCompareExchange16(
>> + __int16 volatile * Destination,
>> + __int16 Exchange,
>> + __int16 Comperand
>> +);
>> +
>> +#pragma intrinsic(_InterlockedCompareExchange16)
>> +
>> +/**
>> + Performs an atomic compare exchange operation on a 16-bit unsigned
>> integer.
>> +
>> + Performs an atomic compare exchange operation on the 16-bit unsigned
>> integer specified
>> + by Value. If Value is equal to CompareValue, then Value is set to
>> ExchangeValue and
>> + CompareValue is returned. If Value is not equal to CompareValue, then
>> Value is returned.
>> + The compare exchange operation must be performed using MP safe mechanisms.
>> +
>> + @param Value A pointer to the 16-bit value for the compare
>> exchange
>> + operation.
>> + @param CompareValue 16-bit value used in compare operation.
>> + @param ExchangeValue 16-bit value used in exchange operation.
>> +
>> + @return The original *Value before exchange.
>> +
>> +**/
>> +UINT16
>> +EFIAPI
>> +InternalSyncCompareExchange16 (
>> + IN UINT16 *Value,
>> + IN UINT16 CompareValue,
>> + IN UINT16 ExchangeValue
>> + )
>> +{
>> + return _InterlockedCompareExchange16 (Value, ExchangeValue, CompareValue);
>> +}
>> +
>> --
>> 1.8.3.2
>>
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