board: ns3: add api to save boot parameters passed from BL31

Add API to save boot parameters passed from BL31

Use assembly implementation of save_boot_params instead of c function.
Because generally ATF does not set up SP_EL2 on exiting.
Thus, usage of a C function immediately after exiting with no stack
setup done by ATF explicitly, may cause SP_EL2 to be not sane,
which in turn causes a crash if this boot was not lucky to get
an SP_EL2 in valid range. Replace C implementation with assembly one
which does not use stack this early, and let u-boot to set up its stack
later.

Signed-off-by: Abhishek Shah <abhishek.shah@broadcom.com>
Signed-off-by: Rajesh Ravi <rajesh.ravi@broadcom.com>
Signed-off-by: Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-bcmns3/bl33_info.h b/arch/arm/include/asm/arch-bcmns3/bl33_info.h
new file mode 100644
index 0000000000..bbc95b0186
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcmns3/bl33_info.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Broadcom.
+ *
+ */
+
+#ifndef BL33_INFO_H
+#define BL33_INFO_H
+#include <asm/io.h>
+
+/* Increase version number each time this file is modified */
+#define BL33_INFO_VERSION	1
+
+struct chip_info {
+	unsigned int chip_id;
+	unsigned int rev_id;
+};
+
+struct bl33_info {
+	unsigned int version;
+	struct chip_info chip;
+};
+
+extern struct bl33_info *bl33_info;
+
+#endif