From 137aee12fb6f8c2c682268c6894110d486c12caa Mon Sep 17 00:00:00 2001 From: Francis Rowe Date: Fri, 28 Nov 2014 05:07:04 -0500 Subject: ThinkPad X200 support added to libreboot --- (limited to 'resources/utilities/ich9deblob/ich9deblob.c') diff --git a/resources/utilities/ich9deblob/ich9deblob.c b/resources/utilities/ich9deblob/ich9deblob.c new file mode 100644 index 0000000..612c75d --- /dev/null +++ b/resources/utilities/ich9deblob/ich9deblob.c @@ -0,0 +1,187 @@ +/* + * ich9deblob.c + * + * gcc -o ich9deblob ich9deblob.c ich9desc.c -I. + * + * Copyright (C) 2014 Steve Shenton + * + * 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 . + */ + + +#include +#include +#include "ich9desc.c" + +#define DESCRIPTORREGIONSIZE 0x1000 +#define GBEREGIONSIZE 0x2000 + +unsigned short GetChecksum(char* buffer, unsigned short desiredValue); +unsigned short GetRegionWord(int i, char* buffer); + +int main(int argc, char *argv[]) +{ + // check compiler bit-packs in a compatible way + struct DESCRIPTORREGIONRECORD descriptorRegion; + unsigned int descriptorRegionStructSize = sizeof(descriptorRegion); + + if (DESCRIPTORREGIONSIZE != descriptorRegionStructSize){ + printf("\nerror: compiler incompatibility: descriptor struct length is %i bytes (should be %i)\n", descriptorRegionStructSize, DESCRIPTORREGIONSIZE); + return 1; + } + + char* factoryRomFilename = "factory.rom"; + char* deblobbedDescriptorFilename = "deblobbed_descriptor.bin"; + + FILE* fp = NULL; + fp = fopen(factoryRomFilename, "rb"); + + if (NULL == fp) + { + printf("\nerror: could not open factory.rom\n"); + return 1; + } + + printf("\nfactory.rom opened successfully\n"); + + char descriptorBuffer[DESCRIPTORREGIONSIZE]; + + unsigned int readLen; + readLen = fread(descriptorBuffer, sizeof(char), DESCRIPTORREGIONSIZE, fp); + if (DESCRIPTORREGIONSIZE != readLen) + { + printf("\nerror: could not read descriptor from factory.rom (%i) bytes read\n", readLen); + return 1; + } + + printf("\ndescriptor region read successfully\n"); + + // copy descriptor buffer into descriptor struct memory + memcpy(&descriptorRegion, &descriptorBuffer, DESCRIPTORREGIONSIZE); + + // get original GBe region location + unsigned int flRegionBitShift = 12; + unsigned int gbeRegionLocation = descriptorRegion.regionSection.flReg3.BASE << flRegionBitShift; + + fseek(fp, gbeRegionLocation, SEEK_SET); + + char gbeBuffer[GBEREGIONSIZE]; + + readLen = fread(gbeBuffer, sizeof(char), GBEREGIONSIZE, fp); + if (GBEREGIONSIZE != readLen) + { + printf("\nerror: could not read GBe region from factory.rom (%i) bytes read\n", readLen); + return 1; + } + + // get rom size + fseek(fp, 0L, SEEK_END); + int romSize = ftell(fp); + + printf("\nfactory.rom size: [%i] bytes\n", romSize); + + fclose(fp); + + printf("\nOriginal Descriptor start block: %08x ; Descriptor end block: %08x\n", descriptorRegion.regionSection.flReg0.BASE << flRegionBitShift, descriptorRegion.regionSection.flReg0.LIMIT << flRegionBitShift); + printf("Original BIOS start block: %08x ; BIOS end block: %08x\n", descriptorRegion.regionSection.flReg1.BASE << flRegionBitShift, descriptorRegion.regionSection.flReg1.LIMIT << flRegionBitShift); + printf("Original ME start block: %08x ; ME end block: %08x\n", descriptorRegion.regionSection.flReg2.BASE << flRegionBitShift, descriptorRegion.regionSection.flReg2.LIMIT << flRegionBitShift); + printf("Original GBe start block: %08x ; GBe end block: %08x\n", gbeRegionLocation, descriptorRegion.regionSection.flReg3.LIMIT << flRegionBitShift); + + // set number of regions from 4 -> 2 (0 based) + descriptorRegion.flMaps.flMap0.NR = 2; + + // make descriptor writable from OS. + descriptorRegion.masterAccessSection.flMstr1.fdRegionWriteAccess = 1; + + // relocate BIOS region and increase size to fill image + descriptorRegion.regionSection.flReg1.BASE = 3; + descriptorRegion.regionSection.flReg1.LIMIT = ((romSize / 0x1000) - 1); + + // set ME region size to 0 + descriptorRegion.regionSection.flReg2.BASE = 0xFFF; + descriptorRegion.regionSection.flReg2.LIMIT = 0; + + // relocate Gbe region + descriptorRegion.regionSection.flReg3.BASE = 1; + descriptorRegion.regionSection.flReg3.LIMIT = 2; + + // set Platform region size to 0 + descriptorRegion.regionSection.flReg4.BASE = 0xFFF; + descriptorRegion.regionSection.flReg4.LIMIT = 0; + + // disable ME in ICHSTRAP0 + descriptorRegion.ichStraps.ichStrap0.meDisable = 1; + + // disable ME and TPM in MCHSTRAP0 + descriptorRegion.mchStraps.mchStrap0.meDisable = 1; + descriptorRegion.mchStraps.mchStrap0.tpmDisable = 1; + + // disable ME, apart from chipset bugfixes (ME region still required) + //descriptorRegion.mchStraps.mchStrap0.meAlternateDisable = 1; + + + printf("\nRelocated Descriptor start block: %08x ; Descriptor end block: %08x\n", descriptorRegion.regionSection.flReg0.BASE << flRegionBitShift, descriptorRegion.regionSection.flReg0.LIMIT << flRegionBitShift); + printf("Relocated BIOS start block: %08x ; BIOS end block: %08x\n", descriptorRegion.regionSection.flReg1.BASE << flRegionBitShift, descriptorRegion.regionSection.flReg1.LIMIT << flRegionBitShift); + printf("Relocated ME start block: %08x ; ME end block: %08x\n", descriptorRegion.regionSection.flReg2.BASE << flRegionBitShift, descriptorRegion.regionSection.flReg2.LIMIT << flRegionBitShift); + printf("Relocated GBe start block: %08x ; GBe end block: %08x\n", descriptorRegion.regionSection.flReg3.BASE << flRegionBitShift, descriptorRegion.regionSection.flReg3.LIMIT << flRegionBitShift); + + + char deblobbedDescriptorBuffer[DESCRIPTORREGIONSIZE]; + memcpy(&deblobbedDescriptorBuffer, &descriptorRegion, DESCRIPTORREGIONSIZE); + + remove(deblobbedDescriptorFilename); + fp = fopen(deblobbedDescriptorFilename, "ab"); + + if (DESCRIPTORREGIONSIZE != fwrite(deblobbedDescriptorBuffer, sizeof(char), DESCRIPTORREGIONSIZE, fp)) + { + printf("\nerror: writing descriptor region failed\n"); + return 1; + } + + if (GBEREGIONSIZE != fwrite(gbeBuffer, sizeof(char), GBEREGIONSIZE, fp)) + { + printf("\nerror: writing GBe region failed\n"); + return 1; + } + + fclose(fp); + + printf("\ndeblobbed descriptor successfully created: deblobbed_descriptor.bin \n"); + + unsigned short gbeCalculatedChecksum = GetChecksum(gbeBuffer, 0xBABA); // observed values 0xBABA 0x3ABA 0x34BA. spec defined as 0xBABA. + unsigned short gbeChecksum = GetRegionWord(0x3F, gbeBuffer); + + printf("\ncalculated Gbe checksum: 0x%hx actual GBe checksum: 0x%hx\n", gbeCalculatedChecksum, gbeChecksum); + + return 0; +} + +unsigned short GetChecksum(char* regionData, unsigned short desiredValue) +{ + unsigned short regionWord; + unsigned short checksum = 0; + + int i; + for (i = 0; i < 0x3F; i++) { + regionWord = GetRegionWord(i, regionData); + checksum += regionWord; + } + checksum = desiredValue - checksum; + return checksum; +} + +unsigned short GetRegionWord(int index, char* regionData) +{ + return *((unsigned short*)(regionData + (index * 2))); +} -- cgit v0.9.1