efi_loader: Add runtime services
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: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/board/ti/am335x/u-boot.lds b/board/ti/am335x/u-boot.lds
index 78f294a..a56cc82 100644
--- a/board/ti/am335x/u-boot.lds
+++ b/board/ti/am335x/u-boot.lds
@@ -59,6 +59,36 @@
. = ALIGN(4);
+ .__efi_runtime_start : {
+ *(.__efi_runtime_start)
+ }
+
+ .efi_runtime : {
+ *(efi_runtime_text)
+ *(efi_runtime_data)
+ }
+
+ .__efi_runtime_stop : {
+ *(.__efi_runtime_stop)
+ }
+
+ .efi_runtime_rel_start :
+ {
+ *(.__efi_runtime_rel_start)
+ }
+
+ .efi_runtime_rel : {
+ *(.relefi_runtime_text)
+ *(.relefi_runtime_data)
+ }
+
+ .efi_runtime_rel_stop :
+ {
+ *(.__efi_runtime_rel_stop)
+ }
+
+ . = ALIGN(4);
+
.image_copy_end :
{
*(.__image_copy_end)