diff options
| author | Jeff Fan <jeff.fan@intel.com> | 2016-03-21 13:36:50 +0800 |
|---|---|---|
| committer | Hao Wu <hao.a.wu@intel.com> | 2016-07-15 09:10:51 +0800 |
| commit | b2c80543522ab3767776a4afd724a2db25f1fc39 (patch) | |
| tree | e27791280066cb959442cba1977dcbb2d6364e62 /MdePkg/Library/BaseSynchronizationLib/Ipf | |
| parent | 0886aba0832570717e450f043af21182a8c46095 (diff) | |
| download | edk2-platforms-b2c80543522ab3767776a4afd724a2db25f1fc39.tar.xz | |
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 <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
(cherry picked from commit 5f0a17d83a6443931068d428600824276ca2bd37)
Diffstat (limited to 'MdePkg/Library/BaseSynchronizationLib/Ipf')
| -rw-r--r-- | MdePkg/Library/BaseSynchronizationLib/Ipf/InternalGetSpinLockProperties.c | 29 |
1 files changed, 29 insertions, 0 deletions
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.<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;
+}
+
|