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/*
* gbe/struct.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
#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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