diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2015-04-14 11:54:40 +0000 |
|---|---|---|
| committer | oliviermartin <oliviermartin@Edk2> | 2015-04-14 11:54:40 +0000 |
| commit | 6ea34e3a459733d3c27617dfb1cee2d841193ca2 (patch) | |
| tree | a4d0d9c6ccdfc9bfa0365a198614668c2920dd5d /ArmPkg/Library/ArmLib/ArmV7 | |
| parent | d94a48c71a67b646903670bfd2426501e4634bd6 (diff) | |
| download | edk2-6ea34e3a459733d3c27617dfb1cee2d841193ca2.tar.gz edk2-6ea34e3a459733d3c27617dfb1cee2d841193ca2.tar.bz2 edk2-6ea34e3a459733d3c27617dfb1cee2d841193ca2.zip | |
ArmPkg: remove cache maintenance by VA operation range size threshold
This removes the range size threshold for virtual address based cache
maintenance instructions that operate on VA ranges to be 'promoted' to
use set/way instructions.
Doing so is unsafe: set/way operations are fundamentally different
from VA operations, and really only suitable for cleaning or invalidating
a cache when turning it on or off.
To quote the ARM ARM (DDI0487A_d G3.4):
"""
Since the set/way instructions are performed only locally, there is no
guarantee of the atomicity of cache maintenance between different PEs,
even if those different PEs are each performing the same cache maintenance
instructions at the same time. Since any cacheable line can be allocated
into the cache at any time, it is possible for [a] cache line to migrate
from an entry in the cache of one PE to the cache of a different PE in a
manner that the cache line avoids being affected by set/way based cache
maintenance. Therefore, ARM strongly discourages the use of set/way
instructions to manage coherency in coherent systems.
"""
Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Olivier Martin <Olivier.Martin@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17176 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPkg/Library/ArmLib/ArmV7')
| -rw-r--r-- | ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf | 3 | ||||
| -rw-r--r-- | ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf | 3 | ||||
| -rw-r--r-- | ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf | 3 |
3 files changed, 0 insertions, 9 deletions
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf index 55c0ec661a..01bdfb6996 100644 --- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf +++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf @@ -48,6 +48,3 @@ [Protocols]
gEfiCpuArchProtocolGuid
-
-[FixedPcd]
- gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf index bc403d5613..ac081068db 100644 --- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf +++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf @@ -48,6 +48,3 @@ [Protocols]
gEfiCpuArchProtocolGuid
-
-[FixedPcd]
- gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf index 4081d1a3e5..a958764f56 100644 --- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf +++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf @@ -42,6 +42,3 @@ [Protocols]
gEfiCpuArchProtocolGuid
-
-[FixedPcd]
- gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
|