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/*
* demefactory.c
* This file is part of the demefactory utility from the libreboot project
*
* Purpose: disable ME on GM45 factory firmware, but leave region intact
* enable read-write on all regions
*
* Copyright (C) 2014, 2015 Leah Rowe <info@minifree.org>
* Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org>
*
* 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/>.
*/
/*
* demfactory utility - main
*/
#include "demefactory.h"
int main()
{
struct DESCRIPTORREGIONRECORD descriptorStruct;
uint8_t* descriptorBuffer = (uint8_t*)&descriptorStruct;
struct GBEREGIONRECORD_8K gbeStruct8k; /* not needed, except for compatibility checking */
char* romFilename = "factory.rom";
char* descriptorFilename = "demefactory_4kdescriptor.bin";
unsigned int bufferLength;
unsigned int romSize;
/*
* ------------------------------------------------------------------
* Compatibility checks. This version of ich9deblob is not yet portable.
* ------------------------------------------------------------------
*/
if (systemOrCompilerIncompatible(descriptorStruct, gbeStruct8k)) return 1;
/* If true, fail with error message */
/*
* ------------------------------------------------------------------
* Extract the descriptor region from the factory.rom dump
* ------------------------------------------------------------------
*/
FILE* fp = NULL;
fp = fopen(romFilename, "rb"); /* open factory.rom */
if (NULL == fp)
{
printf("\nerror: could not open %s\n", romFilename);
fclose(fp);
return 1;
}
printf("\n%s opened successfully\n", romFilename);
/*
* Get the descriptor region dump from the factory.rom
* (goes in factoryDescriptorBuffer variable)
*/
bufferLength = fread(descriptorBuffer, 1, DESCRIPTORREGIONSIZE, fp);
if (DESCRIPTORREGIONSIZE != bufferLength) //
{
printf("\nerror: could not read descriptor from %s (%i) bytes read\n", romFilename, bufferLength);
fclose(fp);
return 1;
}
printf("\ndescriptor region read successfully\n");
/* ------------------------------------------------- */
fseek(fp, 0L, SEEK_END);
romSize = ftell(fp);
printf("\n%s size: [%i] bytes\n", romFilename, romSize);
/* -------------------------------------------------- */
fclose(fp);
/* Debugging (before modification) */
printDescriptorRegionLocations(descriptorStruct, "Original");
/*
* ------------------------------------------------------------------
* Modify the descriptor region, ready to go in the modified factory.rom
* ------------------------------------------------------------------
*/
// Disable the ME/TPM:
descriptorStruct = descriptorDisableMe(descriptorStruct);
descriptorStruct = descriptorDisableTpm(descriptorStruct);
/* Host/CPU is allowed to read/write all regions. */
descriptorStruct = descriptorHostRegionsUnlocked(descriptorStruct);
/* The ME is disallowed read-write access to all regions
* (this is probably redundant, since the ME is already removed from libreboot) */
descriptorStruct = descriptorMeRegionsForbidden(descriptorStruct);
/* Debugging (after modifying the descriptor region) */
printDescriptorRegionLocations(descriptorStruct, "Modified");
/*
* ------------------------------------------------------------------
* Create the file with the modified descriptor inside
* ------------------------------------------------------------------
*/
printf("\n");
if (notCreated4kDescriptorFile(descriptorStruct, descriptorFilename)) {
return 1;
}
/*
* ------------------------------------------------------------------
* Generate ich9gen data (C code that will recreate the deactivatedME descriptor from scratch)
* ------------------------------------------------------------------
*/
/* Code for generating the Descriptor struct */
/* mkdescriptor.h */
if (notCreatedHFileForDescriptorCFile("mkdescriptor.h", "mkdescriptor.c")) {
return 1;
} /* and now mkdescriptor.c */
if (notCreatedCFileFromDescriptorStruct(descriptorStruct, "mkdescriptor.c", "mkdescriptor.h")) {
return 1;
}
printf("The modified descriptor region has also been dumped as src files: mkdescriptor.c, mkdescriptor.h\n\n");
return 0;
}
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