From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=134.134.136.20; helo=mga02.intel.com; envelope-from=ruiyu.ni@intel.com; receiver=edk2-devel@lists.01.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) (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 A80CB21A07A80 for ; Mon, 10 Sep 2018 19:25:23 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Sep 2018 19:25:23 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,358,1531810800"; d="scan'208";a="73218316" Received: from fmsmsx108.amr.corp.intel.com ([10.18.124.206]) by orsmga006.jf.intel.com with ESMTP; 10 Sep 2018 19:25:15 -0700 Received: from fmsmsx158.amr.corp.intel.com (10.18.116.75) by FMSMSX108.amr.corp.intel.com (10.18.124.206) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 10 Sep 2018 19:25:15 -0700 Received: from shsmsx152.ccr.corp.intel.com (10.239.6.52) by fmsmsx158.amr.corp.intel.com (10.18.116.75) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 10 Sep 2018 19:25:15 -0700 Received: from shsmsx104.ccr.corp.intel.com ([169.254.5.143]) by SHSMSX152.ccr.corp.intel.com ([169.254.6.150]) with mapi id 14.03.0319.002; Tue, 11 Sep 2018 10:25:12 +0800 From: "Ni, Ruiyu" To: "Kinney, Michael D" , "edk2-devel@lists.01.org" CC: "Yao, Jiewen" , "Gao, Liming" Thread-Topic: [PATCH] MdePkg/SynchronizationLib: fix Interlocked[De|In]crement return value Thread-Index: AQHUSSS3yzrIulI920iGap46TmJBxaTqWuJQ Date: Tue, 11 Sep 2018 02:25:11 +0000 Message-ID: <734D49CCEBEEF84792F5B80ED585239D5BE028E7@SHSMSX104.ccr.corp.intel.com> References: <20180910100600.276668-1-ruiyu.ni@intel.com> In-Reply-To: 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] 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: Tue, 11 Sep 2018 02:25:23 -0000 Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The NASM does the exactly same as the MSFT intrinsic. I'd like to remove them because I was almost lost in so many versions of In= terlocked[De|In]crement. I'd like to merge them to one version. Thanks/Ray > -----Original Message----- > From: Kinney, Michael D > Sent: Tuesday, September 11, 2018 12:39 AM > To: Ni, Ruiyu ; edk2-devel@lists.01.org; Kinney, Mich= ael > D > Cc: Yao, Jiewen ; Gao, Liming > > Subject: RE: [PATCH] MdePkg/SynchronizationLib: fix > Interlocked[De|In]crement return value >=20 > Ray, >=20 > Why are we removing the use of intrinsics from MSFT builds? We should > keep those for more efficient code generation if the intrinsic has the co= rrect > behavior. >=20 > Thanks, >=20 > Mike >=20 > > -----Original Message----- > > From: Ni, Ruiyu > > Sent: Monday, September 10, 2018 3:06 AM > > To: edk2-devel@lists.01.org > > Cc: Yao, Jiewen ; Gao, Liming > > ; Kinney, Michael D > > Subject: [PATCH] MdePkg/SynchronizationLib: fix > > Interlocked[De|In]crement return value > > > > Today's InterlockedIncrement()/InterlockedDecrement() > > guarantees to > > perform atomic increment/decrement but doesn't guarantee the return > > value equals to the new value. > > > > The patch fixes the behavior to use "XADD" instruction to guarantee > > the return value equals to the new value. > > > > 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.c | 46 > > ---------------------- > > .../X64/InterlockedDecrement.nasm | 8 > > ++-- > > .../X64/InterlockedIncrement.c | 46 > > ---------------------- > > .../X64/InterlockedIncrement.nasm | 5 > > ++- > > 16 files changed, 52 insertions(+), 240 deletions(-) delete mode > > 100644 MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDe > > crement.c > > delete mode 100644 > > MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedIn > > crement.c > > delete mode 100644 > > MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDec > > rement.c > > delete mode 100644 > > MdePkg/Library/BaseSynchronizationLib/X64/InterlockedInc > > rement.c > > > > 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 ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > @@ -166,8 +165,7 @@ InterlockedIncrement ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > diff --git > > a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLib.inf > > b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLib.inf > > index 0be1d4331f..b971cd138d 100755 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLib.inf > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLib.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 > > + Ia32/InterlockedDecrement.nasm | MSFT > > + Ia32/InterlockedIncrement.nasm | MSFT SynchronizationMsc.c | MSFT > > > > 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 > > + X64/InterlockedDecrement.nasm | MSFT > X64/InterlockedIncrement.nasm > > + | MSFT SynchronizationMsc.c | MSFT > > > > 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 > > > > Ia32/InternalGetSpinLockProperties.c | GCC diff --git > > a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLibInternals.h > > b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLibInternals.h > > index 37edd7c188..8c363a8585 100644 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLibInternals.h > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizat > > ionLibInternals.h > > @@ -27,8 +27,7 @@ > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > @param Value A pointer to the 32-bit value to increment. > > > > @@ -47,8 +46,7 @@ InternalSyncIncrement ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > @param Value A pointer to the 32-bit value to decrement. > > > > 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 @@ > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > @param Value A pointer to the 32-bit value to increment. > > > > @@ -37,9 +36,10 @@ InternalSyncIncrement ( > > UINT32 Result; > > > > __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 ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > @param Value A pointer to the 32-bit value to decrement. > > > > @@ -74,9 +73,10 @@ InternalSyncDecrement ( > > UINT32 Result; > > > > __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/Interlocked > > Decrement.c > > b/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Decrement.c > > deleted file mode 100644 > > index 354a0e7ab1..0000000000 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Decrement.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 not > > - 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/Interlocked > > Decrement.nasm > > b/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Decrement.nasm > > index 4c46041186..dd5a8de3ed 100644 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Decrement.nasm > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Decrement.nasm > > @@ -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/Interlocked > > Increment.c > > b/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Increment.c > > deleted file mode 100644 > > index c61a550119..0000000000 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Increment.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 not > > - 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/Interlocked > > Increment.nasm > > b/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Increment.nasm > > index 3902c73275..0677e4bf78 100644 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Increment.nasm > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/Ia32/Interlocked > > Increment.nasm > > @@ -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 > > > > 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 ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > @@ -256,8 +255,7 @@ InterlockedIncrement ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > diff --git > > a/MdePkg/Library/BaseSynchronizationLib/SynchronizationG > > cc.c > > b/MdePkg/Library/BaseSynchronizationLib/SynchronizationG > > cc.c > > index 5ac548b19f..177739d3da 100644 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/SynchronizationG > > cc.c > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/SynchronizationG > > cc.c > > @@ -247,8 +247,7 @@ ReleaseSpinLock ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > @@ -272,8 +271,7 @@ InterlockedIncrement ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > diff --git > > a/MdePkg/Library/BaseSynchronizationLib/SynchronizationM > > sc.c > > b/MdePkg/Library/BaseSynchronizationLib/SynchronizationM > > sc.c > > index e3298c8ab4..6ab2d71870 100644 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/SynchronizationM > > sc.c > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/SynchronizationM > > sc.c > > @@ -249,8 +249,7 @@ ReleaseSpinLock ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > @@ -274,8 +273,7 @@ InterlockedIncrement ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > If Value is NULL, then ASSERT(). > > > > 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 @@ > > > > > > > > - > > /** > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > @param Value A pointer to the 32-bit value to increment. > > > > @@ -38,9 +36,10 @@ InternalSyncIncrement ( > > UINT32 Result; > > > > __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 ( > > > > 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 not > > - guaranteed to be MP safe. > > + performed using MP safe mechanisms. > > > > @param Value A pointer to the 32-bit value to decrement. > > > > @@ -74,9 +72,10 @@ InternalSyncDecrement ( > > UINT32 Result; > > > > __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/InterlockedD > > ecrement.c > > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedD > > ecrement.c > > deleted file mode 100644 > > index da402cd4c6..0000000000 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedD > > ecrement.c > > +++ /dev/null > > @@ -1,46 +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. > > - > > -**/ > > - > > -/** > > - Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics. > > -**/ > > - > > -long _InterlockedDecrement( > > - long * lpAddend > > -); > > - > > -#pragma intrinsic(_InterlockedDecrement) > > - > > -/** > > - 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 not > > - 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 > > - ) > > -{ > > - return _InterlockedDecrement ((long *)(UINTN)(Value)); -} > > - > > diff --git > > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedD > > ecrement.nasm > > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedD > > ecrement.nasm > > index 60f43111fe..dabdca945e 100644 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedD > > ecrement.nasm > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedD > > ecrement.nasm > > @@ -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/InterlockedI > > ncrement.c > > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedI > > ncrement.c > > deleted file mode 100644 > > index bbd1384602..0000000000 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedI > > ncrement.c > > +++ /dev/null > > @@ -1,46 +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. > > - > > -**/ > > - > > -/** > > - Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics. > > -**/ > > - > > -long _InterlockedIncrement( > > - long * lpAddend > > -); > > - > > -#pragma intrinsic(_InterlockedIncrement) > > - > > -/** > > - 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 not > > - 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 > > - ) > > -{ > > - return _InterlockedIncrement ((long *)(UINTN)(Value)); -} > > - > > diff --git > > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedI > > ncrement.nasm > > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedI > > ncrement.nasm > > index 7f877b5774..77379d998e 100644 > > --- > > a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedI > > ncrement.nasm > > +++ > > b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedI > > ncrement.nasm > > @@ -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 > > > > -- > > 2.16.1.windows.1