coreboot: unify infrastructure for loading payloads

A payload can be loaded either from a vboot region or from cbfs.
Provide a common place for choosing where the payload is loaded
from. Additionally, place the logic in the 'loaders' directory
similarly to the ramstage loader infrastructure.

Change-Id: I6b0034ea5ebd04a3d058151819ac77a126a6bfe2
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5296
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/lib/loaders/cbfs_payload_loader.c b/src/lib/loaders/cbfs_payload_loader.c
new file mode 100644
index 0000000000..2c1d1796f2
--- /dev/null
+++ b/src/lib/loaders/cbfs_payload_loader.c
@@ -0,0 +1,44 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <cbfs.h>
+#include <payload_loader.h>
+
+static int cbfs_locate_payload(struct payload *payload)
+{
+	void *buffer;
+	size_t size;
+	const int type = CBFS_TYPE_PAYLOAD;
+
+	buffer = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, payload->name,
+					type, &size);
+
+	if (buffer == NULL)
+		return -1;
+
+	payload->backing_store.data = buffer;
+	payload->backing_store.size = size;
+
+	return 0;
+}
+
+const struct payload_loader_ops cbfs_payload_loader = {
+	.name = "CBFS",
+	.locate = cbfs_locate_payload,
+};