diff options
Diffstat (limited to 'resources/utilities/ich9deblob/gbe')
| -rw-r--r-- | resources/utilities/ich9deblob/gbe/gbe.c | 124 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/gbe/gbe.h | 101 |
2 files changed, 0 insertions, 225 deletions
diff --git a/resources/utilities/ich9deblob/gbe/gbe.c b/resources/utilities/ich9deblob/gbe/gbe.c deleted file mode 100644 index 9eee828..0000000 --- a/resources/utilities/ich9deblob/gbe/gbe.c +++ /dev/null @@ -1,124 +0,0 @@ -/* - * gbe/gbe.c - * 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/>. - */ - -/* - * Provide gbe related functions. - */ - -/* structs describing the data from gbe region */ -#include "gbe.h" - -/* - * --------------------------------------------------------------------- - * Gbe functions: - * --------------------------------------------------------------------- - */ - -/* Read a 16-bit unsigned int from a supplied region buffer */ -unsigned short gbeGetRegionWordFrom8kBuffer(int index, char* regionData) -{ - return *((unsigned short*)(regionData + (index * 2))); -} - -/* - * gbe checksum calculation (algorithm based on datasheet) - */ -unsigned short gbeGetChecksumFrom8kBuffer(char* regionData, unsigned short desiredValue, int byteOffset) -{ - int i; - - /* - * byteOffset defines the byte address where the gbe begins in the buffer "regionData". - * However, this function works with 16-bit words. Shift the byte offset to the right for the word (16-bit) offset. - */ - int wordOffset = byteOffset >> 1; - - unsigned short regionWord; /* store words here for adding to checksum */ - unsigned short checksum = 0; /* this gbe's checksum */ - - for (i = 0; i < 0x3F; i++) { - regionWord = gbeGetRegionWordFrom8kBuffer(i+wordOffset, regionData); - checksum += regionWord; - } - checksum = desiredValue - checksum; - return checksum; -} - -/* checksum calculation for 4k gbe struct (algorithm based on datasheet) */ -unsigned short gbeGetChecksumFrom4kStruct(struct GBEREGIONRECORD_4K gbeStruct4k, unsigned short desiredValue) -{ - char gbeBuffer4k[GBEREGIONSIZE_4K]; - memcpy(&gbeBuffer4k, &gbeStruct4k, GBEREGIONSIZE_4K); - return gbeGetChecksumFrom8kBuffer(gbeBuffer4k, desiredValue, 0); -} - -/* modify the gbe region extracted from a factory.rom dump */ -struct GBEREGIONRECORD_8K deblobbedGbeStructFromFactory(struct GBEREGIONRECORD_8K factoryGbeStruct8k) -{ - /* - * Correct the main gbe region. By default, the X200 (as shipped from Lenovo) comes - * with a broken main gbe region, where the backup gbe region is used instead. Modify - * it so that the main region is usable. - */ - - struct GBEREGIONRECORD_8K deblobbedGbeStruct8k; - memcpy(&deblobbedGbeStruct8k, &factoryGbeStruct8k, GBEREGIONSIZE_8K); - - deblobbedGbeStruct8k.backup.checkSum = gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.backup, GBECHECKSUMTOTAL); - memcpy(&deblobbedGbeStruct8k.main, &deblobbedGbeStruct8k.backup, GBEREGIONSIZE_4K); - - return deblobbedGbeStruct8k; -} - -/* - * --------------------------------------------------------------------- - * Debugging functions: - * --------------------------------------------------------------------- - */ - -/* - * show debugging info: show calculated (correct) gbe checksum and what - * is actually stored, in a 4K gbe struct. Only for a single region. - */ -void printGbeChecksumDataFromStruct4k(struct GBEREGIONRECORD_4K gbeStruct4k, char* romName, char* regionName) -{ - printf( - "%s Gbe (%s): calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", - romName, - regionName, - gbeGetChecksumFrom4kStruct(gbeStruct4k, GBECHECKSUMTOTAL), - gbeStruct4k.checkSum - ); - - return; -} - -/* - * show debugging info: show calculated (correct) gbe checksum and what - * is actually stored, in a 8K gbe struct. Do so for main and backup regions. - */ -void printGbeChecksumDataFromStruct8k(struct GBEREGIONRECORD_8K gbeStruct8k, char* romName) -{ - printGbeChecksumDataFromStruct4k(gbeStruct8k.main, romName, "main"); - printGbeChecksumDataFromStruct4k(gbeStruct8k.backup, romName, "backup"); - - return; -} diff --git a/resources/utilities/ich9deblob/gbe/gbe.h b/resources/utilities/ich9deblob/gbe/gbe.h deleted file mode 100644 index bfcc002..0000000 --- a/resources/utilities/ich9deblob/gbe/gbe.h +++ /dev/null @@ -1,101 +0,0 @@ -/* - * 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 |