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author | Francis Rowe <info@gluglug.org.uk> | 2014-12-25 16:25:49 (EST) |
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committer | Francis Rowe <info@gluglug.org.uk> | 2014-12-25 16:25:49 (EST) |
commit | a8b13d23f29a08026eaa308b8b09be7e9d1ff5a6 (patch) | |
tree | 0cdc767b9b44b94ca4fbec16bf88496bc4656dd4 /resources/utilities/ich9deblob/gbe/gbe.c | |
parent | 655ac91c5db8818c7cef7e9e44febaf36459d394 (diff) | |
download | libreboot-a8b13d23f29a08026eaa308b8b09be7e9d1ff5a6.zip libreboot-a8b13d23f29a08026eaa308b8b09be7e9d1ff5a6.tar.gz libreboot-a8b13d23f29a08026eaa308b8b09be7e9d1ff5a6.tar.bz2 |
ich9deblob: moved src to src/, .o files to obj/
Diffstat (limited to 'resources/utilities/ich9deblob/gbe/gbe.c')
-rw-r--r-- | resources/utilities/ich9deblob/gbe/gbe.c | 124 |
1 files changed, 0 insertions, 124 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; -} |