feat(imx): add helper to take params from BL2
So far the i.MX BL31 doesn't take any parameters. This means the BL32
image base address and whether or not a BL32 image is used at all has to
be hardcoded in BL31.
This adds a helper function that allows to take params from BL2 safely.
On i.MX BL2 is usually U-Boot SPL which passes random values in arg0,
so make sure arg0 is within the internal SRAM range before accessing it
as a pointer. Also make sure arg0 is sufficiently aligned and the header
type and version is correct.
Change-Id: Idab8013a1d6dabf50a83c75f3e6f831de4a537e9
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/plat/imx/common/include/plat_common.h b/plat/imx/common/include/plat_common.h
new file mode 100644
index 0000000..6f41222
--- /dev/null
+++ b/plat/imx/common/include/plat_common.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2024, Pengutronix, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef PLAT_COMMON_H
+#define PLAT_COMMON_H
+
+#include <stdint.h>
+#include <common/bl_common.h>
+
+int imx_bl31_params_parse(uintptr_t arg0, uintptr_t ocram_base,
+ uintptr_t ocram_size,
+ entry_point_info_t *bl32_info,
+ entry_point_info_t *bl33_info);
+
+#endif /* PLAT_COMMON_H */