Add flashmap (fmap) support to Flashrom

fmap.h

Index: fmap.h
diff --git a/fmap.h b/fmap.h
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+/*
+ * Copyright 2010, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *    * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This is ported from the flashmap utility: http://flashmap.googlecode.com
+ */
+
+#ifndef FLASHMAP_LIB_FMAP_H__
+#define FLASHMAP_LIB_FMAP_H__
+
+#include <inttypes.h>
+
+#define FMAP_SIGNATURE		"__FMAP__"
+#define FMAP_VER_MAJOR		1	/* this header's FMAP minor version */
+#define FMAP_VER_MINOR		1	/* this header's FMAP minor version */
+#define FMAP_STRLEN		32	/* maximum length for strings, */
+					/* including null-terminator */
+
+enum fmap_flags {
+	FMAP_AREA_STATIC	= 1 << 0,
+	FMAP_AREA_COMPRESSED	= 1 << 1,
+	FMAP_AREA_RO		= 1 << 2,
+};
+
+struct fmap_area {
+	uint32_t offset;		/* offset relative to base */
+	uint32_t size;			/* size in bytes */
+	uint8_t  name[FMAP_STRLEN];	/* descriptive name */
+	uint16_t flags;			/* flags for this area */
+}  __attribute__((packed));
+/* Mapping of volatile and static regions in firmware binary */
+struct fmap {
+	uint64_t signature;		/* "__FMAP__" (0x5F5F50414D465F5F) */
+	uint8_t  ver_major;		/* major version */
+	uint8_t  ver_minor;		/* minor version */
+	uint64_t base;			/* address of the firmware binary */
+	uint32_t size;			/* size of firmware binary in bytes */
+	uint8_t  name[FMAP_STRLEN];	/* name of this firmware binary */
+	uint16_t nareas;		/* number of areas described by
+					   fmap_areas[] below */
+	struct fmap_area areas[];
+} __attribute__((packed));
+
+/*
+ * fmap_find - find FMAP signature in a binary image and copy it to buffer
+ *
+ * @flash:	flash structure containing read function
+ * @buf:	unallocated buffer to store fmap struct
+ *
+ * This function allocates memory which the caller must free. It does no error
+ * checking. The caller is responsible for verifying that the contents are sane.
+ *
+ * returns size of fmap struct to indicate success
+ * returns <0 to indicate failure
+ */
+extern int fmap_find(struct flashchip *flash, uint8_t **buf);
+
+#endif	/* FLASHMAP_LIB_FMAP_H__*/