From b2c80543522ab3767776a4afd724a2db25f1fc39 Mon Sep 17 00:00:00 2001 From: Jeff Fan Date: Mon, 21 Mar 2016 13:36:50 +0800 Subject: MdePkg/BaseSynchronizationLib: Add spin lock alignment for IA32/x64 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 Cc: Liming Gao Cc: Star Zeng Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan Reviewed-by: Liming Gao Reviewed-by: Star Zeng (cherry picked from commit 5f0a17d83a6443931068d428600824276ca2bd37) --- .../Ipf/InternalGetSpinLockProperties.c | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c (limited to 'MdePkg/Library/BaseSynchronizationLib/Ipf') diff --git a/MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c b/MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c new file mode 100644 index 0000000000..f6464c2db7 --- /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.
+ 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; +} + -- cgit v1.2.3