Ard Biesheuvel 2dbed52506 ArmVirtPkg/ArmVirtMemoryInitPeiLib: avoid redundant cache invalidation ... Alex reports that the cache invalidation performed by ArmVirtMemoryInitPeiLib takes a non-negligible amount of time at boot. This cache invalidation used to be necessary to avoid inconsistencies between the CPU's cached and uncached views of the permanent PEI memory region, given that the PEI phase is where the MMU gets enabled. The only allocations done from permanent PEI memory with the MMU off are pages used for page tables, and since commit 748fea6279 ("ArmPkg/ArmMmuLib AARCH64: invalidate page tables before populating them"), each of those is invalidated in the caches explicitly, for reasons described in the patch's commit log. All other allocations done in PEI are either from temporary PEI memory, which includes the stack, or from permanent PEI memory but after the MMU has been enabled. This means that the cache invalidation in ArmVirtMemoryInitPeiLib is no longer necessary, and can simply be dropped. Reported-by: Alexander Graf <graf@amazon.com> Reviewed-by: Leif Lindholm <leif@nuviainc.com> Reviewed-by: Alexander Graf <graf@amazon.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>		2022-02-25 15:57:11 +00:00
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ArmVirtMemoryInitPeiLib.c	ArmVirtPkg/ArmVirtMemoryInitPeiLib: avoid redundant cache invalidation	2022-02-25 15:57:11 +00:00
ArmVirtMemoryInitPeiLib.inf	ArmVirtPkg: Replace BSD License with BSD+Patent License	2019-04-09 09:10:21 -07:00