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+/*
+ * gbe/gbe.h
+ * This file is part of the ich9deblob utility from the libreboot project
+ *
+ * Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org>
+ * Francis Rowe <info@gluglug.org.uk>
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Purpose: provide struct representing gbe region.
+ * Map actual buffers of this regions, directly to instances of these
+ * structs. This makes working with gbe really easy.
+ */
+
+/*
+ * bit fields used, corresponding to datasheet. See links to datasheets
+ * and documentation in ich9deblob.c
+ */
+
+#ifndef GBESTRUCT_H
+#define GBESTRUCT_H
+
+#include <stdio.h>
+#include <string.h>
+
+/* Size of the full gbe region in bytes */
+#define GBEREGIONSIZE_8K 0x2000
+/*
+ * Size of each sub-region in gbe.
+ * gbe contains two regions which
+ * can be identical: main and backup.
+ * These are each half the size of the full region
+ */
+#define GBEREGIONSIZE_4K 0x1000
+
+/*
+ * When adding up the first 0x3F 16-bit words
+ * in a 4KiB GBE region, it should be equal
+ * to 0xBABA
+ */
+#define GBECHECKSUMTOTAL 0xBABA
+
+/*
+ * These will have a modified descriptor+gbe based on what's in the factory.rom
+ * These will be joined into a single 12KiB buffer (descriptor, then gbe) and saved to a file
+ * NOTE: The GBE region of 8K is actually 2x 4K regions in a single region; both 4K blocks can be identical (and by default, are)
+ * The 2nd one is a "backup", but we don't know when it's used. perhaps it's used when the checksum on the first one does not match?
+ */
+
+/*
+ * ---------------------------------------------------------------------
+ * Gbe struct representing the data:
+ * ---------------------------------------------------------------------
+ */
+
+struct GBEREGIONRECORD_4K {
+ unsigned char macAddress[6]; /* 0x03 words, or 0x06 bytes */
+ unsigned char otherStuff[120]; /* 0x3c words, or 0x7E bytes */
+ unsigned short checkSum; /* when added to the sum of all words above, this should match GBECHECKSUMTOTAL */
+ unsigned char padding1[3968];
+};
+
+/* main and backup region in gbe */
+struct GBEREGIONRECORD_8K {
+ struct GBEREGIONRECORD_4K main;
+ struct GBEREGIONRECORD_4K backup;
+ /*
+ * Backup region:
+ * This is actually "main" on X200, since the real main has a bad checksum
+ * and other errors. You should do what you need on this one (if modifying
+ * lenovobios's gbe region) and then copy to main
+ */
+};
+
+/*
+ * ---------------------------------------------------------------------
+ * Function declarations (keep gcc/make happy. check them in gbe.c)
+ * ---------------------------------------------------------------------
+ */
+
+unsigned short gbeGetRegionWordFrom8kBuffer(int index, char* regionData);
+unsigned short gbeGetChecksumFrom8kBuffer(char* regionData, unsigned short desiredValue, int byteOffset);
+unsigned short gbeGetChecksumFrom4kStruct(struct GBEREGIONRECORD_4K gbeStruct4k, unsigned short desiredValue);
+struct GBEREGIONRECORD_8K deblobbedGbeStructFromFactory(struct GBEREGIONRECORD_8K factoryGbeStruct8k);
+void printGbeChecksumDataFromStruct4k(struct GBEREGIONRECORD_4K gbeStruct4k, char* romName, char* regionName);
+void printGbeChecksumDataFromStruct8k(struct GBEREGIONRECORD_8K gbeStruct8k, char* romName);
+
+#endif