efi/libstub: Add API function to allocate aligned memory

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Break out the code to create an aligned page allocation from mem.c
and move it into a function efi_allocate_pages_aligned() in alignedmem.c.
Update efi_allocate_pages() to invoke it unless the minimum alignment
equals the EFI page size (4 KB), in which case the ordinary page
allocator is sufficient. This way, efi_allocate_pages_aligned() will
only be pulled into the build if it is actually being used (which will
be on arm64 only in the immediate future)

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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This commit is contained in:

Ard Biesheuvel 2020-03-27 16:09:40 +01:00

parent 5d12da9dd6

commit 43b1df0e01

4 changed files with 71 additions and 17 deletions

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3

drivers/firmware/efi/libstub/Makefile

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57

drivers/firmware/efi/libstub/alignedmem.c

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3

drivers/firmware/efi/libstub/efistub.h

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25

drivers/firmware/efi/libstub/mem.c

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