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>
diff --git a/boot/Kconfig b/boot/Kconfig
index b8db8cd..e0f09e2 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -398,6 +398,16 @@
This provides a way to try out standard boot on an existing boot flow.
+config BOOTMETH_VBE
+ bool "Bootdev support for Verified Boot for Embedded"
+ depends on FIT
+ default y
+ select BOOTMETH_GLOBAL
+ help
+ Enables support for VBE boot. This is a standard boot method which
+ supports selection of various firmware components, seleciton of an OS to
+ boot as well as updating these using fwupd.
+
config BOOTMETH_SANDBOX
def_bool y
depends on SANDBOX
diff --git a/boot/Makefile b/boot/Makefile
index 854b391..c52c969 100644
--- a/boot/Makefile
+++ b/boot/Makefile
@@ -46,3 +46,5 @@
ifdef CONFIG_SPL_BUILD
obj-$(CONFIG_SPL_LOAD_FIT) += common_fit.o
endif
+
+obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_VBE) += vbe.o
diff --git a/boot/vbe.c b/boot/vbe.c
new file mode 100644
index 0000000..e6ee087
--- /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;
+}