arm: add support for platforms with boot memory aliases

The kexec API deals with boot-view addresses, rather than normal system
view addresses.  This causes problems for platforms such as Keystone 2,
where the boot view is substantially different from the normal system
view.

This is because Keystone 2 boots from a memory alias in the lower 4GiB,
before switching to a high alias at 32GiB.

We handle this in a generic way by introducing boot alias resources in
/proc/iomem:

80000000-dfffffff : System RAM (boot alias)
  9f800000-9fffffff : Crash kernel (boot alias)
800000000-85fffffff : System RAM
  800008000-800790e37 : Kernel code
  8007ec000-8008b856f : Kernel data
  81f800000-81fffffff : Crash kernel

To allow kexec to load a kernel, we need to add the boot alias of RAM
to the memory ranges returned by get_memory_ranges().  Parse the
system RAM boot alias into the memory ranges.

Reviewed-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Simon Horman <horms@verge.net.au>

0 files changed, 0 insertions, 0 deletions