tree 70f8acd4853280472d0fd02d5145997b0c9be886
parent 18b9c0d641938242d8bcdba3c14a8f2beec2a97e
author Ard Biesheuvel <ard.biesheuvel@linaro.org> 1460992187 +0200
committer Will Deacon <will.deacon@arm.com> 1461669808 +0100

arm64: relocatable: deal with physically misaligned kernel images

When booting a relocatable kernel image, there is no practical reason
to refuse an image whose load address is not exactly TEXT_OFFSET bytes
above a 2 MB aligned base address, as long as the physical and virtual
misalignment with respect to the swapper block size are equal, and are
both aligned to THREAD_SIZE.

Since the virtual misalignment is under our control when we first enter
the kernel proper, we can simply choose its value to be equal to the
physical misalignment.

So treat the misalignment of the physical load address as the initial
KASLR offset, and fix up the remaining code to deal with that.

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