On 26 February 2015 at 08:50, Ard Biesheuvel <ard.biesheu...@linaro.org> wrote:
> Hello all,
>
> This is the latest version of the InterlockedCompareExchange16() patch.
> Michael has kindly confirmed (thanks Michael) that it does the right
> thing for IPF, but also spotted some issues with the Intel asm versions.
>
> The patch below has the fixes suggested by Michael applied.
>
> I thought there was little point in resending the entire series, so I
> am resending just this patch.
>
> The entire series can be found here
> https://git.linaro.org/people/ard.biesheuvel/uefi-next.git/shortlog/refs/heads/linaro-topic-xen
>
Hello all,
I was wondering if people are now ok with this patch?
It is gating the merge of the entire 29-patch series, so I would
really like to get this accepted. Laszlo has already kindly
volunteered to apply the whole series, but we need someone from
team-Intel to greenlight it.
Thanks,
Ard.
> ---------->8----------------
> 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.mar...@arm.com>
> Acked-by: Jordan Justen <jordan.l.jus...@intel.com>
> Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
> ---
> MdePkg/Include/Library/SynchronizationLib.h | 26 +++++++++++
> .../AArch64/Synchronization.S | 44 ++++++++++++++++++
> .../BaseSynchronizationLib/Arm/Synchronization.S | 44 ++++++++++++++++++
> .../BaseSynchronizationLib/Arm/Synchronization.asm | 44 ++++++++++++++++++
> .../BaseSynchronizationLib.inf | 5 ++
> .../BaseSynchronizationLibInternals.h | 26 +++++++++++
> .../BaseSynchronizationLib/Ebc/Synchronization.c | 31 +++++++++++++
> .../BaseSynchronizationLib/Ia32/GccInline.c | 42 +++++++++++++++++
> .../Ia32/InterlockedCompareExchange16.asm | 46 ++++++++++++++++++
> .../Ia32/InterlockedCompareExchange16.c | 51 ++++++++++++++++++++
> .../Ipf/InterlockedCompareExchange16.s | 30 ++++++++++++
> .../BaseSynchronizationLib/Synchronization.c | 31 +++++++++++++
> .../BaseSynchronizationLib/SynchronizationGcc.c | 31 +++++++++++++
> .../BaseSynchronizationLib/SynchronizationMsc.c | 31 +++++++++++++
> .../Library/BaseSynchronizationLib/X64/GccInline.c | 44 ++++++++++++++++++
> .../X64/InterlockedCompareExchange16.asm | 42 +++++++++++++++++
> .../X64/InterlockedCompareExchange16.c | 54
> ++++++++++++++++++++++
> 17 files changed, 622 insertions(+)
> create mode 100644
> MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.asm
> create mode 100644
> MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c
> create mode 100644
> MdePkg/Library/BaseSynchronizationLib/Ipf/InterlockedCompareExchange16.s
> create mode 100644
> MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm
> create mode 100644
> MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c
>
> 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\t"
> + "lock \n\t"
> + "cmpxchgw %1, %2 \n\t"
> + : "=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..7d14e8e830c5
> --- /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 ax, [esp + 8]
> + mov dx, [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..102173b11e30
> --- /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 ax, CompareValue
> + mov dx, 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\t"
> + "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..e01e9fa92875
> --- /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 ax, dx
> + 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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