vbe: Add initial support for VBE

Create a new bootmeth for VBE along with a library to handle finding the
VBE methods.

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

1 files changed, 119 insertions, 0 deletions

diff --git a/boot/vbe.c b/boot/vbe.c
new file mode 100644
index 00000000000..e6ee087dc24
--- /dev/null
+++ b/boot/vbe.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Verified Boot for Embedded (VBE) access functions
+ *
+ * Copyright 2022 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <bootmeth.h>
+#include <bootstd.h>
+#include <dm.h>
+#include <image.h>
+#include <vbe.h>
+#include <dm/uclass-internal.h>
+
+/**
+ * is_vbe() - Check if a device is a VBE method
+ *
+ * @dev: Device to check
+ * @return true if this is a VBE bootmth device, else false
+ */
+static bool is_vbe(struct udevice *dev)
+{
+	return !strncmp("vbe", dev->driver->name, 3);
+}
+
+int vbe_find_next_device(struct udevice **devp)
+{
+	for (uclass_find_next_device(devp);
+	     *devp;
+	     uclass_find_next_device(devp)) {
+		if (is_vbe(*devp))
+			return 0;
+	}
+
+	return 0;
+}
+
+int vbe_find_first_device(struct udevice **devp)
+{
+	uclass_find_first_device(UCLASS_BOOTMETH, devp);
+	if (*devp && is_vbe(*devp))
+		return 0;
+
+	return vbe_find_next_device(devp);
+}
+
+int vbe_list(void)
+{
+	struct bootstd_priv *std;
+	struct udevice *dev;
+	int ret;
+
+	ret = bootstd_get_priv(&std);
+	if (ret)
+		return ret;
+
+	printf("%3s  %-3s  %-15s  %-15s %s\n", "#", "Sel", "Device", "Driver",
+	       "Description");
+	printf("%3s  %-3s  %-15s  %-15s %s\n", "---", "---", "--------------",
+	       "--------------", "-----------");
+	for (ret = vbe_find_first_device(&dev); dev;
+	     ret = vbe_find_next_device(&dev)) {
+		const struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
+
+		printf("%3d  %-3s  %-15s  %-15s %s\n", dev_seq(dev),
+		       std->vbe_bootmeth == dev ? "*" : "", dev->name,
+		       dev->driver->name, plat->desc);
+	}
+	printf("%3s  %-3s  %-15s  %-15s %s\n", "---", "---", "--------------",
+	       "--------------", "-----------");
+
+	return 0;
+}
+
+int vbe_select(struct udevice *dev)
+{
+	struct bootstd_priv *std;
+	int ret;
+
+	ret = bootstd_get_priv(&std);
+	if (ret)
+		return ret;
+	std->vbe_bootmeth = dev;
+
+	return 0;
+}
+
+int vbe_find_by_any(const char *name, struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret, seq;
+	char *endp;
+
+	seq = simple_strtol(name, &endp, 16);
+
+	/* Select by name */
+	if (*endp) {
+		ret = uclass_get_device_by_name(UCLASS_BOOTMETH, name, &dev);
+		if (ret) {
+			printf("Cannot probe VBE bootmeth '%s' (err=%d)\n", name,
+			       ret);
+			return ret;
+		}
+
+	/* select by number */
+	} else {
+		ret = uclass_get_device_by_seq(UCLASS_BOOTMETH, seq, &dev);
+		if (ret) {
+			printf("Cannot find '%s' (err=%d)\n", name, ret);
+			return ret;
+		}
+	}
+
+	*devp = dev;
+
+	return 0;
+}