arm64: efi: avoid block mappings for unaligned UEFI memory regions

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When running the OS with a page size > 4 KB, we need to round up mappings
for regions that are not aligned to the OS's page size. We already avoid
block mappings for EfiRuntimeServicesCode/Data regions for other reasons,
but in the unlikely event that other unaliged regions exists that have the
EFI_MEMORY_RUNTIME attribute set, ensure that unaligned regions are always
mapped down to pages. This way, the overlapping page is guaranteed not to
be covered by a block mapping that needs to be split.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Ard Biesheuvel 2016-06-29 14:51:28 +02:00 • committed by Catalin Marinas

parent bd264d046a

commit 74c102c988

1 changed files with 14 additions and 0 deletions

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arch/arm64/kernel/efi.c

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