From a8b13d23f29a08026eaa308b8b09be7e9d1ff5a6 Mon Sep 17 00:00:00 2001 From: Francis Rowe Date: Thu, 25 Dec 2014 16:25:49 -0500 Subject: ich9deblob: moved src to src/, .o files to obj/ --- (limited to 'resources/utilities/ich9deblob/src/ich9deblob.c') diff --git a/resources/utilities/ich9deblob/src/ich9deblob.c b/resources/utilities/ich9deblob/src/ich9deblob.c new file mode 100644 index 0000000..ee549d2 --- /dev/null +++ b/resources/utilities/ich9deblob/src/ich9deblob.c @@ -0,0 +1,223 @@ +/* + * ich9deblob.c + * This file is part of the ich9deblob utility from the libreboot project + * + * Purpose: disable and remove the ME from ich9m/gm45 machines in coreboot. + * + * Copyright (C) 2014 Steve Shenton + * Francis Rowe + * + * 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 . + */ + +/* Initially based on proof of concept by Steve Shenton. */ + +/* + * Read a factory.rom dump (ich9m/gm45 machines) and + * modify the flash descriptor to remove all regions except descriptor, + * Gbe and BIOS. Set BIOS region to full size of the ROM image (after + * the flash descriptor and gbe). Basically, deblob the descriptor. + * + * This will will generate a concatenated descriptor+gbe dump suitable + * for use in libreboot. Currently tested: ThinkPad X200 (coreboot/libreboot) + */ + +/* + * See docs/hcl/x200_remove_me.html for info plus links to datasheet (also linked below) + * + * Info about flash descriptor (read page 850 onwards): + * http://www.intel.co.uk/content/dam/doc/datasheet/io-controller-hub-9-datasheet.pdf + * + * Info about Gbe region (read whole datasheet): + * http://www.intel.co.uk/content/dam/doc/application-note/i-o-controller-hub-9m-82567lf-lm-v-nvm-map-appl-note.pdf + * https://communities.intel.com/community/wired/blog/2010/10/14/how-to-basic-eeprom-checksums + */ + +#include "ich9deblob.h" + +int main(int argc, char *argv[]) +{ + /* + * descriptor region. Will have an actual descriptor struct mapped to it (from the factory.rom dump) + * and then it will be modified (deblobbed) to remove the ME/AMT + */ + char factoryDescriptorBuffer[DESCRIPTORREGIONSIZE]; + struct DESCRIPTORREGIONRECORD factoryDescriptorStruct; + struct DESCRIPTORREGIONRECORD deblobbedDescriptorStruct; + + /* + * gbe region. Well have actual gbe buffer mapped to it (from the factory.rom dump) + * and then it will be modified to correct the main region + */ + char factoryGbeBuffer8k[GBEREGIONSIZE_8K]; + struct GBEREGIONRECORD_8K factoryGbeStruct8k; + struct GBEREGIONRECORD_8K deblobbedGbeStruct8k; + + /* + * Used to store the location of the Gbe + * region inside the factory.rom image. + */ + unsigned int factoryGbeRegionStart; + + /* names of the files that this utility will handle */ + char* factoryRomFilename = "factory.rom"; /* user-supplied factory.bin dump (original firmware) */ + char* deblobbedDescriptorFilename = "deblobbed_descriptor.bin"; /* descriptor+gbe: to be dd'd to beginning of a libreboot image */ + + /* Used when reading the factory.rom to extract descriptor/gbe regions */ + unsigned int bufferLength; + + /* For storing the size of the factory.rom dump in bytes */ + unsigned int factoryRomSize; + + /* + * ------------------------------------------------------------------ + * Compatibility checks. This version of ich9deblob is not yet portable. + * ------------------------------------------------------------------ + */ + + if (systemOrCompilerIncompatible(factoryDescriptorStruct, factoryGbeStruct8k)) return 1; + /* If true, fail with error message */ + + /* + * ------------------------------------------------------------------ + * Extract the descriptor and gbe regions from the factory.rom dump + * ------------------------------------------------------------------ + */ + FILE* fileStream = NULL; + fileStream = fopen(factoryRomFilename, "rb"); /* open factory.rom */ + if (NULL == fileStream) + { + printf("\nerror: could not open factory.rom\n"); + return 1; + } + printf("\nfactory.rom opened successfully\n"); + + /* + * Get the descriptor region dump from the factory.rom + * (goes in factoryDescriptorBuffer variable) + */ + bufferLength = fread(factoryDescriptorBuffer, sizeof(char), DESCRIPTORREGIONSIZE, fileStream); + if (DESCRIPTORREGIONSIZE != bufferLength) // + { + printf("\nerror: could not read descriptor from factory.rom (%i) bytes read\n", bufferLength); + return 1; + } + printf("\ndescriptor region read successfully\n"); + /* + * copy descriptor buffer into descriptor struct memory + * factoryDescriptorStruct is an instance of a struct that actually + * defines the locations of all these variables in the descriptor, + * as defined in the datasheets. This allows us to map the extracted + * descriptor over the struct so that it can then be modified + * for libreboot's purpose + */ + memcpy(&factoryDescriptorStruct, &factoryDescriptorBuffer, DESCRIPTORREGIONSIZE); + /* + * ^ the above is just for reference if needed. The modifications will be made here: + */ + memcpy(&deblobbedDescriptorStruct, &factoryDescriptorBuffer, DESCRIPTORREGIONSIZE); + + /* + * Get the gbe region dump from the factory.rom + */ + + /* + * get original GBe region location + * (it will be moved to the beginning of the flash, after the descriptor region) + * note for example, factoryGbeRegionStart is set to <