efi_loader: create root node

Currently we assign a lot of protocols to loaded images though
these protocols are not related to them. Instead they should be
installed on a separate handle. Via the device path it is the
parent to the devices like the network adapter.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 79 insertions, 0 deletions

diff --git a/lib/efi_loader/efi_root_node.c b/lib/efi_loader/efi_root_node.c
new file mode 100644
index 0000000000..b056ba3ee8
--- /dev/null
+++ b/lib/efi_loader/efi_root_node.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Root node for system services
+ *
+ *  Copyright (c) 2018 Heinrich Schuchardt
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <efi_loader.h>
+
+const efi_guid_t efi_u_boot_guid = U_BOOT_GUID;
+
+struct efi_root_dp {
+	struct efi_device_path_vendor vendor;
+	struct efi_device_path end;
+} __packed;
+
+/**
+ * efi_root_node_register() - create root node
+ *
+ * Create the root node on which we install all protocols that are
+ * not related to a loaded image or a driver.
+ *
+ * Return:	status code
+ */
+efi_status_t efi_root_node_register(void)
+{
+	efi_handle_t root;
+	efi_status_t ret;
+	struct efi_root_dp *dp;
+
+	/* Create handle */
+	ret = efi_create_handle(&root);
+	if (ret != EFI_SUCCESS)
+		return ret;
+
+	/* Install device path protocol */
+	dp = calloc(1, sizeof(*dp));
+	if (!dp)
+		return EFI_OUT_OF_RESOURCES;
+
+	/* Fill vendor node */
+	dp->vendor.dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
+	dp->vendor.dp.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR;
+	dp->vendor.dp.length = sizeof(struct efi_device_path_vendor);
+	dp->vendor.guid = efi_u_boot_guid;
+
+	/* Fill end node */
+	dp->end.type = DEVICE_PATH_TYPE_END;
+	dp->end.sub_type = DEVICE_PATH_SUB_TYPE_END;
+	dp->end.length = sizeof(struct efi_device_path);
+
+	/* Install device path protocol */
+	ret = efi_add_protocol(root, &efi_guid_device_path, dp);
+	if (ret != EFI_SUCCESS)
+		goto failure;
+
+	/* Install device path to text protocol */
+	ret = efi_add_protocol(root, &efi_guid_device_path_to_text_protocol,
+			       (void *)&efi_device_path_to_text);
+	if (ret != EFI_SUCCESS)
+		goto failure;
+
+	/* Install device path utilities protocol */
+	ret = efi_add_protocol(root, &efi_guid_device_path_utilities_protocol,
+			       (void *)&efi_device_path_utilities);
+	if (ret != EFI_SUCCESS)
+		goto failure;
+
+	/* Install Unicode collation protocol */
+	ret = efi_add_protocol(root, &efi_guid_unicode_collation_protocol,
+			       (void *)&efi_unicode_collation_protocol);
+	if (ret != EFI_SUCCESS)
+		goto failure;
+
+failure:
+	return ret;
+}