The EFI stub in the ARM kernel runs in the context of the firmware, which
means it usually runs with the caches and MMU on. Currently, we relocate
the zImage so it appears in the first 128 MiB, disable the MMU and caches
and invoke the decompressor via its ordinary entry point. However, since we
can pass the base of DRAM directly, there is no need to relocate the zImage,
which also means there is no need to disable and re-enable the caches and
create new page tables etc.
This also allows systems whose DRAM start address is not a round multiple
of 128 MB to decompress the kernel proper to the base of memory, ensuring
that all memory is usable at runtime.
-----BEGIN PGP SIGNATURE-----
iQEzBAABCgAdFiEEnNKg2mrY9zMBdeK7wjcgfpV0+n0FAl7FbMMACgkQwjcgfpV0
+n15TAgAmWgczY35HCM4Hosv8c7N1xG3HAo5Dn/M6I0twTtAYki33Nb2UgX771sq
tkk8eetDCOtDmfGP0ZED/n2EstXIRcpmCl2cqPdZjX/0XrSpUEyyuTZ+jGoaL6Tb
l8joWq9cr9aCDd0jIKLdwFhusk+dXJWyyoXguFZnIkwMsTauBeNCwMbuUgTyOFro
6R5iF9CFnWl+yNheNQe/F2QKbsCdExW22gBaR2z3sMCeuJKSviy9nwJZGafmm/+S
ySKhFnzREdAdTfk9BEzOm4J3kZFrSOn5YxEOAde/zYB1kcPg/+t0xFdIEu2C0iQp
ruTaJmq0YLSr7psZm3CMmMe0P2lBiw==
=2BnA
-----END PGP SIGNATURE-----
Merge tag 'efi-arm-no-relocate-for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux into misc
Simplify EFI handover to decompressor
The EFI stub in the ARM kernel runs in the context of the firmware, which
means it usually runs with the caches and MMU on. Currently, we relocate
the zImage so it appears in the first 128 MiB, disable the MMU and caches
and invoke the decompressor via its ordinary entry point. However, since we
can pass the base of DRAM directly, there is no need to relocate the zImage,
which also means there is no need to disable and re-enable the caches and
create new page tables etc.
This also allows systems whose DRAM start address is not a round multiple
of 128 MB to decompress the kernel proper to the base of memory, ensuring
that all memory is usable at runtime.
fce2bc254a