From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=134.134.136.24; helo=mga09.intel.com; envelope-from=ruiyu.ni@intel.com; receiver=edk2-devel@lists.01.org Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id B4B102112E030 for ; Thu, 13 Sep 2018 02:53:11 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Sep 2018 02:53:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,368,1531810800"; d="scan'208";a="91341509" Received: from fmsmsx106.amr.corp.intel.com ([10.18.124.204]) by orsmga002.jf.intel.com with ESMTP; 13 Sep 2018 02:50:36 -0700 Received: from shsmsx103.ccr.corp.intel.com (10.239.4.69) by FMSMSX106.amr.corp.intel.com (10.18.124.204) with Microsoft SMTP Server (TLS) id 14.3.319.2; Thu, 13 Sep 2018 02:50:36 -0700 Received: from shsmsx104.ccr.corp.intel.com ([169.254.5.143]) by SHSMSX103.ccr.corp.intel.com ([169.254.4.240]) with mapi id 14.03.0319.002; Thu, 13 Sep 2018 17:50:33 +0800 From: "Ni, Ruiyu" To: "Ni, Ruiyu" , "edk2-devel@lists.01.org" CC: "Kinney, Michael D" , "Yao, Jiewen" , "Gao, Liming" Thread-Topic: [edk2] [PATCH v2] MdePkg/SynchronizationLib: fix Interlocked[De|In]crement return value Thread-Index: AQHUSzv/SI7Hj4Rg6kG7EooAFY+mTaTt+BPA Date: Thu, 13 Sep 2018 09:50:32 +0000 Message-ID: <734D49CCEBEEF84792F5B80ED585239D5BE07FB7@SHSMSX104.ccr.corp.intel.com> References: <20180913082948.17840-1-ruiyu.ni@intel.com> In-Reply-To: <20180913082948.17840-1-ruiyu.ni@intel.com> Accept-Language: en-US, zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.239.127.40] MIME-Version: 1.0 Subject: Re: [PATCH v2] MdePkg/SynchronizationLib: fix Interlocked[De|In]crement return value X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Sep 2018 09:53:11 -0000 Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Please ignore this one. It's an incomplete patch. Please check V3. Thanks/Ray > -----Original Message----- > From: edk2-devel On Behalf Of Ruiyu Ni > Sent: Thursday, September 13, 2018 4:30 PM > To: edk2-devel@lists.01.org > Cc: Kinney, Michael D ; Yao, Jiewen > ; Gao, Liming > Subject: [edk2] [PATCH v2] MdePkg/SynchronizationLib: fix > Interlocked[De|In]crement return value >=20 > Today's InterlockedIncrement()/InterlockedDecrement() guarantees to > perform atomic increment/decrement but doesn't guarantee the return > value equals to the new value. >=20 > The patch fixes the behavior to use "XADD" instruction to guarantee the > return value equals to the new value. >=20 > The patch calls intrinsic functions for MSVC tool chain, calls the NASM > implementation for INTEL tool chain and calls GCC inline assembly > implementation (GccInline.c) for GCC tool chain. >=20 > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Ruiyu Ni > Cc: Jiewen Yao > Cc: Liming Gao > Cc: Michael D Kinney > --- > MdePkg/Include/Library/SynchronizationLib.h | 6 +-- > .../BaseSynchronizationLib.inf | 18 ++++----- > .../BaseSynchronizationLibInternals.h | 6 +-- > .../BaseSynchronizationLib/Ia32/GccInline.c | 18 ++++----- > .../Ia32/InterlockedDecrement.c | 42 ----------------= ----- > .../Ia32/InterlockedDecrement.nasm | 10 ++--- > .../Ia32/InterlockedIncrement.c | 43 ----------------= ------ > .../Ia32/InterlockedIncrement.nasm | 7 ++-- > .../BaseSynchronizationLib/Synchronization.c | 6 +-- > .../BaseSynchronizationLib/SynchronizationGcc.c | 6 +-- > .../BaseSynchronizationLib/SynchronizationMsc.c | 6 +-- > .../Library/BaseSynchronizationLib/X64/GccInline.c | 19 +++++----- > .../X64/InterlockedDecrement.nasm | 8 ++-- > .../X64/InterlockedIncrement.nasm | 5 ++- > 14 files changed, 52 insertions(+), 148 deletions(-) delete mode 100644 > MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c > delete mode 100644 > MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.c >=20 > diff --git a/MdePkg/Include/Library/SynchronizationLib.h > b/MdePkg/Include/Library/SynchronizationLib.h > index da69f6ff5e..ce3bce04f5 100644 > --- a/MdePkg/Include/Library/SynchronizationLib.h > +++ b/MdePkg/Include/Library/SynchronizationLib.h > @@ -144,8 +144,7 @@ ReleaseSpinLock ( >=20 > Performs an atomic increment of the 32-bit unsigned integer specified = by > Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > @@ -166,8 +165,7 @@ InterlockedIncrement ( >=20 > Performs an atomic decrement of the 32-bit unsigned integer specified = by > Value and returns the decremented value. The decrement operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > diff --git > a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf > b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf > index 0be1d4331f..427e959f2e 100755 > --- a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf > +++ b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf > @@ -34,9 +34,9 @@ [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 > + InterlockedIncrementMsc.c | MSFT > + InterlockedDecrementMsc.c | MSFT > + SynchronizationMsc.c | MSFT >=20 > Ia32/InterlockedCompareExchange64.nasm| INTEL > Ia32/InterlockedCompareExchange32.nasm| INTEL @@ -54,17 +54,15 @@ > [Sources.X64] > X64/InterlockedCompareExchange64.c | MSFT > X64/InterlockedCompareExchange32.c | MSFT > X64/InterlockedCompareExchange16.c | MSFT > + InterlockedIncrementMsc.c | MSFT > + InterlockedDecrementMsc.c | MSFT > + SynchronizationMsc.c | MSFT >=20 > X64/InterlockedCompareExchange64.nasm| INTEL > X64/InterlockedCompareExchange32.nasm| INTEL > X64/InterlockedCompareExchange16.nasm| INTEL > - > - X64/InterlockedDecrement.c | MSFT > - X64/InterlockedIncrement.c | MSFT > - SynchronizationMsc.c | MSFT > - > - X64/InterlockedDecrement.nasm| INTEL > - X64/InterlockedIncrement.nasm| INTEL > + X64/InterlockedDecrement.nasm | INTEL X64/InterlockedIncrement.nasm > + | INTEL > Synchronization.c | INTEL >=20 > Ia32/InternalGetSpinLockProperties.c | GCC diff --git > a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals. > h > b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals. > h > index 37edd7c188..8c363a8585 100644 > --- > a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals. > h > +++ > b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibIntern > +++ als.h > @@ -27,8 +27,7 @@ >=20 > Performs an atomic increment of the 32-bit unsigned integer specified = by > Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > @param Value A pointer to the 32-bit value to increment. >=20 > @@ -47,8 +46,7 @@ InternalSyncIncrement ( >=20 > Performs an atomic decrement of the 32-bit unsigned integer specified = by > Value and returns the decrement value. The decrement operation must be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > @param Value A pointer to the 32-bit value to decrement. >=20 > diff --git a/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c > b/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c > index 4ab293f243..d82e0205f5 100644 > --- a/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c > +++ b/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c > @@ -20,8 +20,7 @@ >=20 > Performs an atomic increment of the 32-bit unsigned integer specified = by > Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > @param Value A pointer to the 32-bit value to increment. >=20 > @@ -37,9 +36,10 @@ InternalSyncIncrement ( > UINT32 Result; >=20 > __asm__ __volatile__ ( > + "movl $1, %%eax \n\t" > "lock \n\t" > - "incl %2 \n\t" > - "movl %2, %%eax " > + "xadd %%eax, %2 \n\t" > + "inc %%eax " > : "=3Da" (Result), // %0 > "=3Dm" (*Value) // %1 > : "m" (*Value) // %2 > @@ -57,8 +57,7 @@ InternalSyncIncrement ( >=20 > Performs an atomic decrement of the 32-bit unsigned integer specified = by > Value and returns the decremented value. The decrement operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > @param Value A pointer to the 32-bit value to decrement. >=20 > @@ -74,9 +73,10 @@ InternalSyncDecrement ( > UINT32 Result; >=20 > __asm__ __volatile__ ( > - "lock \n\t" > - "decl %2 \n\t" > - "movl %2, %%eax " > + "movl $-1, %%eax \n\t" > + "lock \n\t" > + "xadd %%eax, %2 \n\t" > + "dec %%eax " > : "=3Da" (Result), // %0 > "=3Dm" (*Value) // %1 > : "m" (*Value) // %2 > diff --git > a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c > b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c > deleted file mode 100644 > index 354a0e7ab1..0000000000 > --- a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c > +++ /dev/null > @@ -1,42 +0,0 @@ > -/** @file > - InterlockedDecrement function > - > - Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.
> - This program and the accompanying materials > - are licensed and made available under the terms and conditions of the = BSD > License > - which accompanies this distribution. The full text of the license may= be > found at > - http://opensource.org/licenses/bsd-license.php. > - > - THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" > BASIS, > - WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER > EXPRESS OR IMPLIED. > - > -**/ > - > - > - > - > -/** > - Performs an atomic decrement of an 32-bit unsigned integer. > - > - Performs an atomic decrement of the 32-bit unsigned integer specified = by > - Value and returns the decrement value. The decrement operation must be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > - > - @param Value A pointer to the 32-bit value to decrement. > - > - @return The decrement value. > - > -**/ > -UINT32 > -EFIAPI > -InternalSyncDecrement ( > - IN volatile UINT32 *Value > - ) > -{ > - _asm { > - mov eax, Value > - lock dec dword ptr [eax] > - mov eax, [eax] > - } > -} > diff --git > a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.nas > m > b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.nas > m > index 4c46041186..dd5a8de3ed 100644 > --- > a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.nas > m > +++ > b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.na > +++ sm > @@ -1,6 +1,6 @@ > ;-----------------------------------------------------------------------= ------- > ; > -; Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.
> +; Copyright (c) 2006 - 2018, Intel Corporation. All rights > +reserved.
> ; This program and the accompanying materials ; are licensed and made > available under the terms and conditions of the BSD License ; which > accompanies this distribution. The full text of the license may be found= at > @@ -32,8 +32,8 @@ > ;-----------------------------------------------------------------------= ------- > global ASM_PFX(InternalSyncDecrement) > ASM_PFX(InternalSyncDecrement): > - mov eax, [esp + 4] > - lock dec dword [eax] > - mov eax, [eax] > + mov ecx, [esp + 4] > + mov eax, 0FFFFFFFFh > + lock xadd dword [ecx], eax > + dec eax > ret > - > diff --git > a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.c > b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.c > deleted file mode 100644 > index c61a550119..0000000000 > --- a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.c > +++ /dev/null > @@ -1,43 +0,0 @@ > -/** @file > - InterLockedIncrement function > - > - Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.
> - This program and the accompanying materials > - are licensed and made available under the terms and conditions of the = BSD > License > - which accompanies this distribution. The full text of the license may= be > found at > - http://opensource.org/licenses/bsd-license.php. > - > - THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" > BASIS, > - WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER > EXPRESS OR IMPLIED. > - > -**/ > - > - > - > - > -/** > - Performs an atomic increment of an 32-bit unsigned integer. > - > - Performs an atomic increment of the 32-bit unsigned integer specified = by > - Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > - > - @param Value A pointer to the 32-bit value to increment. > - > - @return The incremented value. > - > -**/ > -UINT32 > -EFIAPI > -InternalSyncIncrement ( > - IN volatile UINT32 *Value > - ) > -{ > - _asm { > - mov eax, Value > - lock inc dword ptr [eax] > - mov eax, [eax] > - } > -} > - > diff --git > a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.nasm > b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.nasm > index 3902c73275..0677e4bf78 100644 > --- > a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.nasm > +++ > b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIncrement.na > +++ sm > @@ -32,8 +32,9 @@ > ;-----------------------------------------------------------------------= ------- > global ASM_PFX(InternalSyncIncrement) > ASM_PFX(InternalSyncIncrement): > - mov eax, [esp + 4] > - lock inc dword [eax] > - mov eax, [eax] > + mov ecx, [esp + 4] > + mov eax, 1 > + lock xadd dword [ecx], eax > + inc eax > ret >=20 > diff --git a/MdePkg/Library/BaseSynchronizationLib/Synchronization.c > b/MdePkg/Library/BaseSynchronizationLib/Synchronization.c > index 76c5a1275c..0ab59ca702 100644 > --- a/MdePkg/Library/BaseSynchronizationLib/Synchronization.c > +++ b/MdePkg/Library/BaseSynchronizationLib/Synchronization.c > @@ -231,8 +231,7 @@ ReleaseSpinLock ( >=20 > Performs an atomic increment of the 32-bit unsigned integer specified = by > Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > @@ -256,8 +255,7 @@ InterlockedIncrement ( >=20 > Performs an atomic decrement of the 32-bit unsigned integer specified = by > Value and returns the decremented value. The decrement operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > diff --git a/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c > b/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c > index 5ac548b19f..177739d3da 100644 > --- a/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c > +++ b/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c > @@ -247,8 +247,7 @@ ReleaseSpinLock ( >=20 > Performs an atomic increment of the 32-bit unsigned integer specified = by > Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > @@ -272,8 +271,7 @@ InterlockedIncrement ( >=20 > Performs an atomic decrement of the 32-bit unsigned integer specified = by > Value and returns the decremented value. The decrement operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > diff --git a/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c > b/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c > index e3298c8ab4..6ab2d71870 100644 > --- a/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c > +++ b/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c > @@ -249,8 +249,7 @@ ReleaseSpinLock ( >=20 > Performs an atomic increment of the 32-bit unsigned integer specified = by > Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > @@ -274,8 +273,7 @@ InterlockedIncrement ( >=20 > Performs an atomic decrement of the 32-bit unsigned integer specified = by > Value and returns the decremented value. The decrement operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > If Value is NULL, then ASSERT(). >=20 > diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c > b/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c > index 5224dd063f..4c4d6e3fc7 100644 > --- a/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c > +++ b/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c > @@ -15,14 +15,12 @@ >=20 >=20 >=20 > - > /** > Performs an atomic increment of an 32-bit unsigned integer. >=20 > Performs an atomic increment of the 32-bit unsigned integer specified = by > Value and returns the incremented value. The increment operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > @param Value A pointer to the 32-bit value to increment. >=20 > @@ -38,9 +36,10 @@ InternalSyncIncrement ( > UINT32 Result; >=20 > __asm__ __volatile__ ( > + "movl $1, %%eax \n\t" > "lock \n\t" > - "incl %2 \n\t" > - "mov %2, %%eax " > + "xadd %%eax, %2 \n\t" > + "inc %%eax " > : "=3Da" (Result), // %0 > "=3Dm" (*Value) // %1 > : "m" (*Value) // %2 > @@ -57,8 +56,7 @@ InternalSyncIncrement ( >=20 > Performs an atomic decrement of the 32-bit unsigned integer specified = by > Value and returns the decremented value. The decrement operation must > be > - performed using MP safe mechanisms. The state of the return value is n= ot > - guaranteed to be MP safe. > + performed using MP safe mechanisms. >=20 > @param Value A pointer to the 32-bit value to decrement. >=20 > @@ -74,9 +72,10 @@ InternalSyncDecrement ( > UINT32 Result; >=20 > __asm__ __volatile__ ( > - "lock \n\t" > - "decl %2 \n\t" > - "mov %2, %%eax " > + "movl $-1, %%eax \n\t" > + "lock \n\t" > + "xadd %%eax, %2 \n\t" > + "dec %%eax " > : "=3Da" (Result), // %0 > "=3Dm" (*Value) // %1 > : "m" (*Value) // %2 > diff --git > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDecrement.nasm > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDecrement.nas > m > index 60f43111fe..dabdca945e 100644 > --- > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDecrement.nasm > +++ > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDecrement.nas > +++ m > @@ -1,6 +1,6 @@ > ;-----------------------------------------------------------------------= ------- > ; > -; Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.
> +; Copyright (c) 2006 - 2018, Intel Corporation. All rights > +reserved.
> ; This program and the accompanying materials ; are licensed and made > available under the terms and conditions of the BSD License ; which > accompanies this distribution. The full text of the license may be found= at > @@ -33,7 +33,7 @@ > ;-----------------------------------------------------------------------= ------- > global ASM_PFX(InternalSyncDecrement) > ASM_PFX(InternalSyncDecrement): > - lock dec dword [rcx] > - mov eax, [rcx] > + mov eax, 0FFFFFFFFh > + lock xadd dword [rcx], eax > + dec eax > ret > - > diff --git > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedIncrement.nasm > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedIncrement.nasm > index 7f877b5774..77379d998e 100644 > --- > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedIncrement.nasm > +++ > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedIncrement.nas > +++ m > @@ -33,7 +33,8 @@ > ;-----------------------------------------------------------------------= ------- > global ASM_PFX(InternalSyncIncrement) > ASM_PFX(InternalSyncIncrement): > - lock inc dword [rcx] > - mov eax, [rcx] > + mov eax, 1 > + lock xadd dword [rcx], eax > + inc eax > ret >=20 > -- > 2.16.1.windows.1 >=20 > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel