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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
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