[U-Boot] [PATCH] efi_loader: Clean up system table on exit

[Alexander Graf]

We put the system table into our runtime services data section so that
payloads may still access it after exit_boot_services. However, most fields
in it are quite useless once we're in that state, so let's just patch them
out.

With this patch we don't get spurious warnings when running EFI binaries
anymore.

Signed-off-by: Alexander Graf <agraf at suse.de>
---
 lib/efi_loader/efi_runtime.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 3ee27ca..11d0126 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -125,6 +125,22 @@ static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
 		/* RTC accessors are gone */
 		.ptr = &efi_runtime_services.get_time,
 		.patchto = &efi_device_error,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.con_in,
+		.patchto = NULL,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.con_out,
+		.patchto = NULL,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.std_err,
+		.patchto = NULL,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.boottime,
+		.patchto = NULL,
 	},
 };
 
-- 
1.8.5.6