ArmPkg/UncachedMemoryAllocationLib: use CWG value to align pool allocations
authorArd Biesheuvel <ard.biesheuvel@linaro.org>
Tue, 28 Feb 2017 12:13:11 +0000 (12:13 +0000)
committerArd Biesheuvel <ard.biesheuvel@linaro.org>
Wed, 8 Mar 2017 08:50:00 +0000 (09:50 +0100)
commit25549bda46c581271a303840fb266539c00ede71
tree91a303cc5b08c9ae1e4e9a1b8bf35c15ab9ed58c
parentbb52ec2d6b76b043cd70f277887519f09f36b55a
ArmPkg/UncachedMemoryAllocationLib: use CWG value to align pool allocations

Uncached pool allocations are aligned to the data cache line length under
the assumption that this is sufficient to prevent cache maintenance from
corrupting adjacent allocations. However, the value to use in such cases
is architecturally called the Cache Writeback Granule (CWG), which is
essentially the maximum Dcache line length rather than the minimum.

Note that this is mostly a cosmetical fix, given that the pool allocation
is turned into a page allocation later, and rounded up accordingly.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
ArmPkg/Library/UncachedMemoryAllocationLib/UncachedMemoryAllocationLib.c