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authorFrancis Rowe <info@gluglug.org.uk>2015-05-03 11:48:20 (EDT)
committer Francis Rowe <info@gluglug.org.uk>2015-05-03 11:48:20 (EDT)
commit438cc1fe58f4b65099d778596b93e8094594cb69 (patch)
tree64f15e7b5e970341799fae6f3de103301dfde452 /resources/utilities
parent2350f55533902f9f67b50a920fad2044daec03ac (diff)
downloadlibreboot-438cc1fe58f4b65099d778596b93e8094594cb69.zip
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demefactory (new utility): create GM45 factory.rom without the ME
Diffstat (limited to 'resources/utilities')
-rw-r--r--resources/utilities/ich9deblob/Makefile17
-rw-r--r--resources/utilities/ich9deblob/src/common/descriptor_gbe.c30
-rw-r--r--resources/utilities/ich9deblob/src/common/descriptor_gbe.h1
-rw-r--r--resources/utilities/ich9deblob/src/demefactory.c140
-rw-r--r--resources/utilities/ich9deblob/src/demefactory.h34
5 files changed, 220 insertions, 2 deletions
diff --git a/resources/utilities/ich9deblob/Makefile b/resources/utilities/ich9deblob/Makefile
index be4df85..2db8e84 100644
--- a/resources/utilities/ich9deblob/Makefile
+++ b/resources/utilities/ich9deblob/Makefile
@@ -22,7 +22,7 @@ FORCEC99=-std=c99
CFLAGS=-I. -Wall -Wextra -g $(FORCEC99)
NOLINKER=-c
-all: ich9deblob ich9gen
+all: ich9deblob ich9gen demefactory
ich9deblob: obj/ich9deblob.o obj/common/descriptor_gbe.o \
obj/descriptor/descriptor.o obj/gbe/gbe.o obj/common/x86compatibility.o
@@ -40,6 +40,19 @@ ich9gen: obj/ich9gen.o obj/ich9gen/mkdescriptor.o obj/ich9gen/mkgbe.o \
obj/common/x86compatibility.o obj/descriptor/descriptor.o obj/gbe/gbe.o \
-o ich9gen
+demefactory: obj/demefactory.o obj/common/descriptor_gbe.o \
+ obj/descriptor/descriptor.o obj/gbe/gbe.o obj/common/x86compatibility.o
+
+ $(CC) $(CFLAGS) obj/demefactory.o obj/common/descriptor_gbe.o \
+ obj/common/x86compatibility.o obj/descriptor/descriptor.o obj/gbe/gbe.o \
+ -o demefactory
+
+# for demefactory
+# ----------------------------------------------------------------------
+
+obj/demefactory.o:
+ $(CC) $(CFLAGS) $(NOLINKER) src/demefactory.c -o obj/demefactory.o
+
# for ich9deblob
# ----------------------------------------------------------------------
@@ -76,4 +89,4 @@ obj/gbe/gbe.o:
# make clean
# ----------------------------------------------------------------------
clean:
- rm -rf ich9deblob ich9gen obj/*.o obj/*/*.o
+ rm -rf ich9deblob ich9gen demefactory obj/*.o obj/*/*.o
diff --git a/resources/utilities/ich9deblob/src/common/descriptor_gbe.c b/resources/utilities/ich9deblob/src/common/descriptor_gbe.c
index 6a87452..31cca1b 100644
--- a/resources/utilities/ich9deblob/src/common/descriptor_gbe.c
+++ b/resources/utilities/ich9deblob/src/common/descriptor_gbe.c
@@ -58,3 +58,33 @@ int notCreatedDescriptorGbeFile(struct DESCRIPTORREGIONRECORD descriptorStruct,
return 0;
}
+
+/*
+ * create 4KiB file with descriptor
+ */
+int notCreated4kDescriptorFile(struct DESCRIPTORREGIONRECORD descriptorStruct, char* fileName)
+{
+ FILE* fileStream = NULL;
+
+ /* delete old file before continuing */
+ remove(fileName);
+
+ /* open new file for writing the descriptor+gbe */
+ fileStream = fopen(fileName, "ab");
+
+ /* write the descriptor region into the first part */
+ if (DESCRIPTORREGIONSIZE != fwrite((uint8_t*)&descriptorStruct, 1, sizeof(descriptorStruct), fileStream))
+ {
+ printf("\nerror: writing descriptor region failed\n");
+ return 1;
+ }
+
+
+ fclose(fileStream);
+
+ printf("descriptor successfully written to the file: %s\n", fileName);
+ printf("Now do: dd if=%s of=yourrom.rom bs=1 count=4k conv=notrunc\n", fileName);
+ printf("(in other words, add the modified descriptor to your ROM image)\n\n");
+
+ return 0;
+}
diff --git a/resources/utilities/ich9deblob/src/common/descriptor_gbe.h b/resources/utilities/ich9deblob/src/common/descriptor_gbe.h
index d3e8977..94d4a24 100644
--- a/resources/utilities/ich9deblob/src/common/descriptor_gbe.h
+++ b/resources/utilities/ich9deblob/src/common/descriptor_gbe.h
@@ -32,5 +32,6 @@
#include "../gbe/gbe.h" /* structs describing what's in the gbe region */
int notCreatedDescriptorGbeFile(struct DESCRIPTORREGIONRECORD descriptorStruct, struct GBEREGIONRECORD_8K gbeStruct8k, char* fileName);
+int notCreated4kDescriptorFile(struct DESCRIPTORREGIONRECORD descriptorStruct, char* fileName);
#endif
diff --git a/resources/utilities/ich9deblob/src/demefactory.c b/resources/utilities/ich9deblob/src/demefactory.c
new file mode 100644
index 0000000..1a48360
--- /dev/null
+++ b/resources/utilities/ich9deblob/src/demefactory.c
@@ -0,0 +1,140 @@
+/*
+ * 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) 2015 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/>.
+ */
+
+/*
+ * 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 and gbe regions 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 and remove the ME/Platform regions:
+ descriptorStruct = descriptorMePlatformRegionsRemoved(descriptorStruct);
+ descriptorStruct = descriptorDisableMeTpm(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 and gbe inside
+ * ------------------------------------------------------------------
+ */
+
+ printf("\n");
+ if (notCreated4kDescriptorFile(descriptorStruct, descriptorFilename)) {
+ return 1;
+ }
+
+ /*
+ * ------------------------------------------------------------------
+ * Generate ich9gen data (C code that will recreate the deblobbed descriptor+gbe 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;
+}
diff --git a/resources/utilities/ich9deblob/src/demefactory.h b/resources/utilities/ich9deblob/src/demefactory.h
new file mode 100644
index 0000000..767c547
--- /dev/null
+++ b/resources/utilities/ich9deblob/src/demefactory.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2015 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/>.
+ */
+
+/* Header file for demefactory.c */
+
+#ifndef DEMEFACTORY_H
+#define DEMEFACTORY_H
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "common/descriptor_gbe.h" /* common descriptor/gbe functions used by ich9deblob */
+#include "common/x86compatibility.h" /* system/compiler compatibility checks. This code is not portable. */
+#include "descriptor/descriptor.h" /* structs describing what's in the descriptor region */
+#include "gbe/gbe.h" /* structs describing what's in the gbe region */
+
+int main();
+
+#endif