After booting has finished, EFI allows firmware to still interact with the OS
using the "runtime services". These callbacks live in a separate address space,
since they are available long after U-Boot has been overwritten by the OS.

This patch adds enough framework for arbitrary code inside of U-Boot to become
a runtime service with the right section attributes set. For now, we don't make
use of it yet though.

We could maybe in the future map U-boot environment variables to EFI variables
here.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Tested-by: NSimon Glass <sjg@chromium.org>

One of the basic EFI interfaces is the console interface. Using it an EFI
application can interface with the user. This patch implements an EFI console
interface using getc() and putc().

Today, we only implement text based consoles. We also convert the EFI Unicode
characters to UTF-8 on the fly, hoping that everyone managed to jump on the
train by now.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Tested-by: NSimon Glass <sjg@chromium.org>

When an EFI application runs, it has access to a few descriptor and callback
tables to instruct the EFI compliant firmware to do things for it. The bulk
of those interfaces are "boot time services". They handle all object management,
and memory allocation.

This patch adds support for the boot time services and also exposes a system
table, which is the point of entry descriptor table for EFI payloads.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Tested-by: NSimon Glass <sjg@chromium.org>

EFI uses the PE binary format for its application images. Add support to EFI PE
binaries as well as all necessary bits for the "EFI image loader" interfaces.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Tested-by: NSimon Glass <sjg@chromium.org>