From eb9d06304049ca03e4d00c81b43fb996d8424a1f Mon Sep 17 00:00:00 2001 From: Leah Rowe Date: Sat, 8 Apr 2023 03:14:48 +0100 Subject: add ich9utils back to utils don't download it. keep it in lbmk. libreboot moved to codeberg for git hosting, and i didn't want to keep lugging around an extra git repo just for one tiny project. --- util/ich9utils/src/ich9show.c | 152 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) create mode 100644 util/ich9utils/src/ich9show.c (limited to 'util/ich9utils/src/ich9show.c') diff --git a/util/ich9utils/src/ich9show.c b/util/ich9utils/src/ich9show.c new file mode 100644 index 00000000..4d71dadf --- /dev/null +++ b/util/ich9utils/src/ich9show.c @@ -0,0 +1,152 @@ +/* + * ich9show.c + * Just a little hack by Leah to show the ICH9 region read/write status + * + * Purpose: disable and remove the ME from ich9m/gm45 systems in coreboot. + * + * Copyright (C) 2014 Steve Shenton + * Copyright (C) 2014,2015,2019 Leah Rowe + * + * 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 . + */ + +/* Initially based on proof of concept by Steve Shenton. */ +/* Original utility can be found at https://gitorious.org/ich9descriptortool */ + +/* + * Read a factory.rom dump (ich9m/gm45 systems) 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/hardware/x200_remove_me.html for info plus links to datasheet (also linked below) + * + * Info about flash descriptor (read page 845 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://web.archive.org/web/20150912070329/https://communities.intel.com/community/wired/blog/2010/10/14/how-to-basic-eeprom-checksums + */ + +#include "ich9show.h" + +int main(int argc, char *argv[]) +{ + if(argc!=2) { + printf("Incorrect number of arguments. Please specify *one* ROM path.\n"); + return 1; + } /* TODO: Make ich9show support dumping stats of multiple ROM images */ + + struct DESCRIPTORREGIONRECORD descriptorStruct; + uint8_t* descriptorBuffer = (uint8_t*)&descriptorStruct; + + struct GBEREGIONRECORD_8K gbeStruct8k; + uint8_t* gbeBuffer8k = (uint8_t*)&gbeStruct8k; + uint32_t gbeRegionStart; + + char* romFilename = argv[1]; + + 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"); + 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 the given 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"); + + if(!validDescriptor(descriptorStruct)) { + printf("Invalid input: incorrect signature in the given descriptor."); + fclose(fp); + return 1; + } + + if (descriptorDefinesGbeRegion(descriptorStruct)) + { + gbeRegionStart = descriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT; + + /* + * Set offset so that we can read the data from + * the gbe region + */ + fseek(fp, gbeRegionStart, SEEK_SET); + /* Read the gbe data from the given ROM and put it in factoryGbeBuffer8k */ + bufferLength = fread(gbeBuffer8k, 1, GBEREGIONSIZE_8K, fp); + if (GBEREGIONSIZE_8K != bufferLength) + { + printf("\nerror: could not read GBe region from %s (%i) bytes read\n", romFilename, bufferLength); + fclose(fp); + return 1; + } + printf("\ngbe (8KiB) region read successfully\n"); + } + + fseek(fp, 0L, SEEK_END); + romSize = ftell(fp); + printf("\n%s size: [%i] bytes\n", romFilename, romSize); + + fclose(fp); + + showDescriptorData(descriptorStruct); + + if (descriptorDefinesGbeRegion(descriptorStruct)) + { + printf("\nMain GbE region:\n\n"); + showGbeData(gbeStruct8k.main); + printf("\n"); + + printf("\nBackup GbE region:\n\n"); + showGbeData(gbeStruct8k.backup); + printf("\n"); + } + + return 0; +} -- cgit v1.2.1