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Diffstat (limited to 'resources/utilities/ich9deblob/main.c')
| -rw-r--r-- | resources/utilities/ich9deblob/main.c | 248 |
1 files changed, 0 insertions, 248 deletions
diff --git a/resources/utilities/ich9deblob/main.c b/resources/utilities/ich9deblob/main.c deleted file mode 100644 index f469f83..0000000 --- a/resources/utilities/ich9deblob/main.c +++ /dev/null @@ -1,248 +0,0 @@ -/* - * main.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 <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/>. - */ - -/* 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 <stdio.h> -#include <string.h> -#include "descriptor/descriptor.h" /* structs describing what's in the descriptor region */ -#include "gbe/gbe.h" /* structs describing what's in the gbe region */ -#include "x86compatibility.h" /* system/compiler compatibility checks. This code is not portable. */ - -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; - char deblobbedDescriptorBuffer[DESCRIPTORREGIONSIZE]; - 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; - char deblobbedGbeBuffer8k[GBEREGIONSIZE_8K]; - 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 <<FLREGIONBITSHIFT of actual address (in C). this is how the addresses - * are stored in the descriptor. - */ - factoryGbeRegionStart = factoryDescriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT; - - /* - * Set offset so that we can read the data from - * the gbe region - */ - fseek(fileStream, factoryGbeRegionStart, SEEK_SET); - /* Read the gbe data from the factory.rom and put it in factoryGbeBuffer8k */ - bufferLength = fread(factoryGbeBuffer8k, sizeof(char), GBEREGIONSIZE_8K, fileStream); - if (GBEREGIONSIZE_8K != bufferLength) - { - printf("\nerror: could not read GBe region from factory.rom (%i) bytes read\n", bufferLength); - return 1; - } - printf("\ngbe (8KiB) region read successfully\n"); - /* - * copy gbe buffer into gbe struct memory - * factoryGbeStruct8k is an instance of a struct that actually - * defines the locations of all these variables in the gbe, - * as defined in the datasheets. This allows us to map the extracted - * gbe over the struct so that it can then be modified - * for libreboot's purpose - */ - memcpy(&factoryGbeStruct8k, &factoryGbeBuffer8k, GBEREGIONSIZE_8K); - /* - * the original factoryGbeStruct8k is only reference. Changes go here: - */ - memcpy(&deblobbedGbeStruct8k, &factoryGbeBuffer8k, GBEREGIONSIZE_8K); - - /* - * Get size of ROM image - * This is needed for relocating the BIOS region (per descriptor) - */ - fseek(fileStream, 0L, SEEK_END); - factoryRomSize = ftell(fileStream); - - printf("\nfactory.rom size: [%i] bytes\n", factoryRomSize); - - fclose(fileStream); - - /* - * ------------------------------------------------------------------ - * Modify the descriptor and gbe regions, ready to go in libreboot.rom - * ------------------------------------------------------------------ - */ - - /* - * Disable the ME and Platform regions. Put Gbe at the beginning (after descriptor). - * Also, extend the BIOS region to fill the ROM image (after descriptor+gbe). - */ - deblobbedDescriptorStruct = deblobbedDescriptorStructFromFactory(factoryDescriptorStruct, factoryRomSize); - - /* - * Modify the Gbe region (see function for details) - */ - deblobbedGbeStruct8k = deblobbedGbeStructFromFactory(factoryGbeStruct8k); - - /* - * ------------------------------------------------------------------ - * Create the file with the modified descriptor and gbe inside - * ------------------------------------------------------------------ - */ - - /* - * Convert the deblobbed descriptor and gbe back to byte arrays, so that they - * can more easily be written to files: - * deblobbed descriptor region - */ - memcpy(&deblobbedDescriptorBuffer, &deblobbedDescriptorStruct, DESCRIPTORREGIONSIZE); /* descriptor */ - memcpy(&deblobbedGbeBuffer8k, &deblobbedGbeStruct8k, GBEREGIONSIZE_8K); /* gbe */ - - /* delete old file before continuing */ - remove(deblobbedDescriptorFilename); - - /* open new file for writing the deblobbed descriptor+gbe */ - fileStream = fopen(deblobbedDescriptorFilename, "ab"); - - /* write the descriptor region into the first part */ - if (DESCRIPTORREGIONSIZE != fwrite(deblobbedDescriptorBuffer, sizeof(char), DESCRIPTORREGIONSIZE, fileStream)) - { - printf("\nerror: writing descriptor region failed\n"); - return 1; - } - - /* add gbe to the end of the file */ - if (GBEREGIONSIZE_8K != fwrite(deblobbedGbeBuffer8k, sizeof(char), GBEREGIONSIZE_8K, fileStream)) - { - printf("\nerror: writing GBe region failed\n"); - return 1; - } - - fclose(fileStream); - - printf("\ndeblobbed descriptor successfully created: deblobbed_descriptor.bin \n"); - - // ------------------------------------------------------------------------------------- - - printf("\nNow do: dd if=deblobbed_descriptor.bin of=libreboot.rom bs=1 count=12k conv=notrunc"); - printf("\n(in other words, add the modified descriptor+gbe to your ROM image)\n"); - - return 0; -} |