1 files changed, 62 insertions, 0 deletions
diff --git a/src/include/region_file.h b/src/include/region_file.h
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+++ b/src/include/region_file.h
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+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 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.
+ */
+
+#ifndef REGION_FILE_H
+#define REGION_FILE_H
+
+#include <commonlib/region.h>
+#include <stdint.h>
+
+/*
+ * A region file is an abstraction to allow appending updates in a
+ * region_device where the data returned is the most recently written
+ * data. It is block based with a 16 byte granularity. So if you write
+ * 2 bytes into the file the data returned in the region_device would
+ * have 16 bytes allocated for the latest update. Additionally, the
+ * current maximum file size allowed is 1MiB - 48 bytes. See comments
+ * in C implementation file for further details.
+ */
+
+struct region_file;
+
+/*
+ * Initialize a region file associated with a provided region device.
+ * Returns < 0 on error, 0 on success.
+ */
+int region_file_init(struct region_file *f, const struct region_device *p);
+
+/*
+ * Initialize region device object associated with latest update of file data.
+ * Returns < 0 on error, 0 on success.
+ */
+int region_file_data(const struct region_file *f, struct region_device *rdev);
+
+/* Update region file with latest data. Returns < 0 on error, 0 on success. */
+int region_file_update_data(struct region_file *f, const void *buf,
+				size_t size);
+
+/* Declared here for easy object allocation. */
+struct region_file {
+	/* Region device covering file */
+	struct region_device rdev;
+	/* Metadata containing blocks of the data stream. */
+	struct region_device metadata;
+	/* Blocks forming data. */
+	uint16_t data_blocks[2];
+	/* Current slot in metadata marking end of data. */
+	int slot;
+};
+
+#endif /* REGION_FILE_H */