Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: a9c9cfa0790c3fce6957db603488b85306c37385
https://github.com/tianocore/edk2/commit/a9c9cfa0790c3fce6957db603488b85306c37385
Author: Chris Fernald <[email protected]>
Date: 2026-06-09 (Tue, 09 Jun 2026)
Changed paths:
M ArmPkg/Drivers/CpuDxe/CpuMmuCommon.c
Log Message:
-----------
ArmPkg: Flush data cache when remapping region as non-cacheable
When mapping a region as non-cacheable or device memory, dirty cache lines
may persistent, and depending on the caching behavior of the platform, may
be written back corrupting data in the future. To prevent this, the data
cache should be flushed and invalidated for the range after the mapping
has been changed, but before accessing the memory. Currently, the
EFI_CPU_ARCH_PROTOCOL implementation makes the caller responsible for this,
but this is prone to obscure and difficult to diagnose memory issues if
this is missed. It is safer to always perform the flush when mapping as
non-cacheable, even if this may be redundant in some cases.
Signed-off-by: Chris Fernald <[email protected]>
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