Merge branch '2022-10-31-vbe-implement-the-full-firmware-flow'

To quote Simon:
This series provides an implementation of VBE from TPL through to U-Boot
proper, using VBE to load the relevant firmware stages. It buils a single
image.bin file containing all the phases:

   TPL - initial phase, loads VPL using binman symbols
   VPL - main firmware phase, loads SPL using VBE parameters
   SPL - loads U-Boot proper using VBE parameters
   U-Boot - final firmware phase, where OS booting is processed

This series does not include the OS-booting phase. That will be the
subject of a future series.

The implementation is entirely handled by sandbox. It should be possible
to enable this on a real board without much effort, but that is also the
subject of a future series.

1 files changed, 104 insertions, 0 deletions

diff --git a/boot/vbe_simple_os.c b/boot/vbe_simple_os.c
new file mode 100644
index 00000000000..b2041a95a30
--- /dev/null
+++ b/boot/vbe_simple_os.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Verified Boot for Embedded (VBE) loading firmware phases
+ *
+ * Copyright 2022 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#define LOG_CATEGORY LOGC_BOOT
+
+#include <common.h>
+#include <dm.h>
+#include <bootflow.h>
+#include <vbe.h>
+#include <version_string.h>
+#include <dm/device-internal.h>
+#include "vbe_simple.h"
+
+int vbe_simple_fixup_node(ofnode node, struct simple_state *state)
+{
+	const char *version, *str;
+	int ret;
+
+	version = strdup(state->fw_version);
+	if (!version)
+		return log_msg_ret("dup", -ENOMEM);
+
+	ret = ofnode_write_string(node, "cur-version", version);
+	if (ret)
+		return log_msg_ret("ver", ret);
+	ret = ofnode_write_u32(node, "cur-vernum", state->fw_vernum);
+	if (ret)
+		return log_msg_ret("num", ret);
+
+	/* Drop the 'U-Boot ' at the start */
+	str = version_string;
+	if (!strncmp("U-Boot ", str, 7))
+		str += 7;
+	ret = ofnode_write_string(node, "bootloader-version", str);
+	if (ret)
+		return log_msg_ret("bl", ret);
+
+	return 0;
+}
+
+/**
+ * bootmeth_vbe_simple_ft_fixup() - Write out all VBE simple data to the DT
+ *
+ * @ctx: Context for event
+ * @event: Event to process
+ * @return 0 if OK, -ve on error
+ */
+static int bootmeth_vbe_simple_ft_fixup(void *ctx, struct event *event)
+{
+	oftree tree = event->data.ft_fixup.tree;
+	struct udevice *dev;
+
+	/*
+	 * Ideally we would have driver model support for fixups, but that does
+	 * not exist yet. It is a step too far to try to do this before VBE is
+	 * in place.
+	 */
+	for (vbe_find_first_device(&dev); dev; vbe_find_next_device(&dev)) {
+		struct simple_state state;
+		ofnode node, subnode, chosen;
+		int ret;
+
+		if (strcmp("vbe_simple", dev->driver->name))
+			continue;
+
+		/* Check if there is a node to fix up, adding if not */
+		chosen = oftree_path(tree, "/chosen");
+		if (!ofnode_valid(chosen))
+			continue;
+		ret = ofnode_add_subnode(chosen, "fwupd", &node);
+		if (ret && ret != -EEXIST)
+			return log_msg_ret("fwu", ret);
+
+		ret = ofnode_add_subnode(node, dev->name, &subnode);
+		if (ret && ret != -EEXIST)
+			return log_msg_ret("dev", ret);
+
+		ret = device_probe(dev);
+		if (ret)
+			return log_msg_ret("probe", ret);
+
+		/* Copy over the vbe properties for fwupd */
+		log_debug("Fixing up: %s\n", dev->name);
+		ret = ofnode_copy_props(dev_ofnode(dev), subnode);
+		if (ret)
+			return log_msg_ret("cp", ret);
+
+		ret = vbe_simple_read_state(dev, &state);
+		if (ret)
+			return log_msg_ret("read", ret);
+
+		ret = vbe_simple_fixup_node(subnode, &state);
+		if (ret)
+			return log_msg_ret("fix", ret);
+	}
+
+	return 0;
+}
+EVENT_SPY(EVT_FT_FIXUP, bootmeth_vbe_simple_ft_fixup);