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authorFrancis Rowe <info@gluglug.org.uk>2014-12-23 20:03:02 (EST)
committer Francis Rowe <info@gluglug.org.uk>2014-12-23 20:03:02 (EST)
commit692c63adc4c486a8b5ce01a5869c45d69d243e09 (patch)
treea4d529531318ac924d3bcacef2ae7916484e4638 /resources/utilities/ich9deblob/main.c
parent8ff050d3893f0115b8bd3f1feda5d032f89fbc32 (diff)
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ich9deblob: rename main.c back to ich9deblob.c
Diffstat (limited to 'resources/utilities/ich9deblob/main.c')
-rw-r--r--resources/utilities/ich9deblob/main.c248
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diff --git a/resources/utilities/ich9deblob/main.c b/resources/utilities/ich9deblob/main.c
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-/*
- * 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;
-}