From d8a878600cbda7d20e0775db62b3964d1e3fb228 Mon Sep 17 00:00:00 2001
From: Francis Rowe <info@gluglug.org.uk>
Date: Tue, 23 Dec 2014 08:16:18 -0500
Subject: ich9deblob: move ich9gbe.h to gbe/struct.h

---
(limited to 'resources/utilities/ich9deblob/gbe/struct.h')

diff --git a/resources/utilities/ich9deblob/gbe/struct.h b/resources/utilities/ich9deblob/gbe/struct.h
new file mode 100644
index 0000000..3b49789
--- /dev/null
+++ b/resources/utilities/ich9deblob/gbe/struct.h
@@ -0,0 +1,54 @@
+/*
+ *  gbe/struct.h
+ *  This file is part of the ich9deblob utility from the libreboot project
+ *
+ *  Copyright (C) 2014 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
+
+#define GBEREGIONSIZE 0x2000 // 8 KiB
+// 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?
+
+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 be 0xBABA
+	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
+};
+
+#endif
--
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