efi/x86: libstub: Make DXE calls mixed mode safe

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The newly added DXE calls use 64-bit quantities, which means we need to
marshall them explicitly when running in mixed mode. Currently, we get
away without it because we just bail when GetMemorySpaceDescriptor()
fails, which is guaranteed to happen due to the function argument mixup.

Let's fix this properly, though, by defining the macros that describe
how to marshall the arguments. While at it, drop an incorrect cast on a
status variable.

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

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This commit is contained in:

Ard Biesheuvel 2022-05-20 12:07:58 +02:00

parent ca209f8b5f

commit 31f1a0edff

2 changed files with 11 additions and 2 deletions

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9

arch/x86/include/asm/efi.h

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4

drivers/firmware/efi/libstub/x86-stub.c

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