>From Intel(R) 64 and IA-32 Architectures Software Developer's Manual, one lock or semaphore is suggested to be present within a cache line. If the processors are based on Intel NetBurst microarchitecture, two cache lines are suggested. This could minimize the bus traffic required to service locks.
Cc: Michael Kinney <michael.d.kin...@intel.com> Cc: Liming Gao <liming....@intel.com> Cc: Star Zeng <star.z...@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff....@intel.com> --- .../BaseSynchronizationLib.inf | 9 +++- .../BaseSynchronizationLibInternals.h | 14 ++++- .../Ia32/InternalGetSpinLockProperties.c | 60 ++++++++++++++++++++++ .../Ipf/InternalGetSpinLockProperties.c | 29 +++++++++++ .../BaseSynchronizationLib/SynchronizationGcc.c | 2 +- .../BaseSynchronizationLib/SynchronizationMsc.c | 2 +- 6 files changed, 112 insertions(+), 4 deletions(-) create mode 100644 MdePkg/Library/BaseSynchronizationLib/Ia32/InternalGetSpinLockProperties.c create mode 100644 MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c diff --git a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf index bd1bec3..bcd7935 100755 --- a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf +++ b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf @@ -1,7 +1,7 @@ ## @file # Base Synchronization Library implementation. # -# Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR> +# Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR> # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> # # This program and the accompanying materials @@ -30,6 +30,7 @@ BaseSynchronizationLibInternals.h [Sources.IA32] + Ia32/InternalGetSpinLockProperties.c | MSFT Ia32/InterlockedCompareExchange64.c | MSFT Ia32/InterlockedCompareExchange32.c | MSFT Ia32/InterlockedCompareExchange16.c | MSFT @@ -44,10 +45,12 @@ Ia32/InterlockedIncrement.asm | INTEL Synchronization.c | INTEL + Ia32/InternalGetSpinLockProperties.c | GCC Ia32/GccInline.c | GCC SynchronizationGcc.c | GCC [Sources.X64] + Ia32/InternalGetSpinLockProperties.c | MSFT X64/InterlockedCompareExchange64.c | MSFT X64/InterlockedCompareExchange32.c | MSFT X64/InterlockedCompareExchange16.c | MSFT @@ -64,6 +67,7 @@ X64/InterlockedIncrement.asm | INTEL Synchronization.c | INTEL + Ia32/InternalGetSpinLockProperties.c | GCC X64/GccInline.c | GCC SynchronizationGcc.c | GCC @@ -73,6 +77,9 @@ Ipf/InterlockedCompareExchange32.s Ipf/InterlockedCompareExchange16.s + Ipf/InternalGetSpinLockProperties.c | MSFT + Ipf/InternalGetSpinLockProperties.c | GCC + Synchronization.c | INTEL SynchronizationMsc.c | MSFT SynchronizationGcc.c | GCC diff --git a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h index 76f7023..9716b92 100644 --- a/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h +++ b/MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h @@ -1,7 +1,7 @@ /** @file Declaration of internal functions in BaseSynchronizationLib. - Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> + Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR> This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at @@ -138,4 +138,16 @@ InternalSyncCompareExchange64 ( IN UINT64 ExchangeValue ); +/** + Internal function to retrieve the architecture specific spin lock alignment + requirements for optimal spin lock performance. + + @return The architecture specific spin lock alignment. + +**/ +UINTN +InternalGetSpinLockProperties ( + VOID + ); + #endif diff --git a/MdePkg/Library/BaseSynchronizationLib/Ia32/InternalGetSpinLockProperties.c b/MdePkg/Library/BaseSynchronizationLib/Ia32/InternalGetSpinLockProperties.c new file mode 100644 index 0000000..49f05fb --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/Ia32/InternalGetSpinLockProperties.c @@ -0,0 +1,60 @@ +/** @file + Internal function to get spin lock alignment. + + Copyright (c) 2016, Intel Corporation. All rights reserved.<BR> + This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php. + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +#include "BaseSynchronizationLibInternals.h" + +/** + Internal function to retrieve the architecture specific spin lock alignment + requirements for optimal spin lock performance. + + @return The architecture specific spin lock alignment. + +**/ +UINTN +InternalGetSpinLockProperties ( + VOID + ) +{ + UINT32 RegEax; + UINT32 RegEbx; + UINTN FamilyId; + UINTN ModelId; + UINTN CacheLineSize; + + // + // Retrieve CPUID Version Information + // + AsmCpuid (0x01, &RegEax, &RegEbx, NULL, NULL); + // + // EBX: Bits 15 - 08: CLFLUSH line size (Value * 8 = cache line size) + // + CacheLineSize = ((RegEbx >> 8) & 0xff) * 8; + // + // Retrieve CPU Family and Model + // + FamilyId = (RegEax >> 8) & 0xf; + ModelId = (RegEax >> 4) & 0xf; + if (FamilyId == 0x0f) { + // + // In processors based on Intel NetBurst microarchitecture, use two cache lines + // + ModelId = ModelId | ((RegEax >> 12) & 0xf0); + if (ModelId <= 0x04 || ModelId == 0x06) { + CacheLineSize *= 2; + } + } + + return CacheLineSize; +} + diff --git a/MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c b/MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c new file mode 100644 index 0000000..f6464c2 --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c @@ -0,0 +1,29 @@ +/** @file + Internal function to get spin lock alignment. + + Copyright (c) 2016, Intel Corporation. All rights reserved.<BR> + This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php. + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +/** + Internal function to retrieve the architecture specific spin lock alignment + requirements for optimal spin lock performance. + + @return The architecture specific spin lock alignment. + +**/ +UINTN +InternalGetSpinLockProperties ( + VOID + ) +{ + return 32; +} + diff --git a/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c b/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c index 31f28ec..4b8c8e5 100644 --- a/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c +++ b/MdePkg/Library/BaseSynchronizationLib/SynchronizationGcc.c @@ -45,7 +45,7 @@ GetSpinLockProperties ( VOID ) { - return 32; + return InternalGetSpinLockProperties (); } /** diff --git a/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c b/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c index 821c798..db344b7 100644 --- a/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c +++ b/MdePkg/Library/BaseSynchronizationLib/SynchronizationMsc.c @@ -47,7 +47,7 @@ GetSpinLockProperties ( VOID ) { - return 32; + return InternalGetSpinLockProperties (); } /** -- 2.7.4.windows.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
