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-rw-r--r--util/ich9utils/src/demefactory.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/util/ich9utils/src/demefactory.c b/util/ich9utils/src/demefactory.c
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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;
+}