vbe: Support reading the next SPL phase via VBE

Add an SPL loader to obtain the next-phase binary from a FIT provided
by the VBE driver.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/boot/vbe_simple.h b/boot/vbe_simple.h
new file mode 100644
index 0000000000..e37a9fae37
--- /dev/null
+++ b/boot/vbe_simple.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Verified Boot for Embedded (VBE) vbe-simple common file
+ *
+ * Copyright 2022 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __VBE_SIMPLE_H
+#define __VBE_SIMPLE_H
+
+/** struct simple_priv - information read from the device tree */
+struct simple_priv {
+	u32 area_start;
+	u32 area_size;
+	u32 skip_offset;
+	u32 state_offset;
+	u32 state_size;
+	u32 version_offset;
+	u32 version_size;
+	const char *storage;
+};
+
+/**
+ * vbe_simple_read_fw_bootflow() - Read a bootflow for firmware
+ *
+ * Locates and loads the firmware image (FIT) needed for the next phase. The FIT
+ * should ideally use external data, to reduce the amount of it that needs to be
+ * read.
+ *
+ * @bdev: bootdev device containing the firmwre
+ * @blow: Place to put the created bootflow, on success
+ * @return 0 if OK, -ve on error
+ */
+int vbe_simple_read_bootflow_fw(struct udevice *dev, struct bootflow *bflow);
+
+#endif /* __VBE_SIMPLE_H */