diff options
Diffstat (limited to 'resources/utilities/ich9deblob')
| -rw-r--r-- | resources/utilities/ich9deblob/Makefile | 22 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/descriptor/descriptor.c | 128 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/descriptor/descriptor.h | 111 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/gbe/gbe.c | 107 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/gbe/gbe.h | 81 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/main.c (renamed from resources/utilities/ich9deblob/ich9deblob.c) | 6 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/x86compatibility.c | 3 | ||||
| -rw-r--r-- | resources/utilities/ich9deblob/x86compatibility.h | 33 |
8 files changed, 305 insertions, 186 deletions
diff --git a/resources/utilities/ich9deblob/Makefile b/resources/utilities/ich9deblob/Makefile index 0a69882..36a892c 100644 --- a/resources/utilities/ich9deblob/Makefile +++ b/resources/utilities/ich9deblob/Makefile @@ -18,10 +18,24 @@ # CC=gcc -CFLAGS=-I. +CFLAGS=-I. -Wall -g -ich9deblob: ich9deblob.c descriptor/descriptor.h gbe/gbe.h - $(CC) $(CFLAGS) ich9deblob.c descriptor/descriptor.h gbe/gbe.h -o ich9deblob +all: ich9deblob + +ich9deblob: main.o descriptor/descriptor.o gbe/gbe.o x86compatibility.o + $(CC) $(CFLAGS) main.o descriptor/descriptor.o gbe/gbe.o x86compatibility.o -o ich9deblob + +main.o: main.c + $(CC) $(CFLAGS) -c main.c -o main.o + +descriptor/descriptor.o: descriptor/descriptor.c + $(CC) $(CFLAGS) -c descriptor/descriptor.c -o descriptor/descriptor.o + +gbe/gbe.o: gbe/gbe.c + $(CC) $(CFLAGS) -c gbe/gbe.c -o gbe/gbe.o + +x86compatibility.o: x86compatibility.c + $(CC) $(CFLAGS) -c x86compatibility.c -o x86compatibility.o clean: - rm -f ich9deblob *.o + rm -f ich9deblob *.o */*.o diff --git a/resources/utilities/ich9deblob/descriptor/descriptor.c b/resources/utilities/ich9deblob/descriptor/descriptor.c new file mode 100644 index 0000000..0e7f2bf --- /dev/null +++ b/resources/utilities/ich9deblob/descriptor/descriptor.c @@ -0,0 +1,128 @@ +/* + * descriptor/descriptor.c + * This file is part of the ich9deblob utility from the libreboot project + * + * Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org> + * 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/>. + */ + +/* + * Provide descriptor related functions. + */ + +#include <stdio.h> +#include <string.h> + +/* structs describing the data in descriptor region */ +#include "descriptor.h" + +/* + * --------------------------------------------------------------------- + * Descriptor functions + * --------------------------------------------------------------------- + */ + +/* + * Modify the flash descriptor, to remove the ME/AMT, and disable all other regions + * Only Flash Descriptor, Gbe and BIOS regions (BIOS region fills factoryRomSize-12k) are left. + * Tested on ThinkPad X200 and X200S. X200T and other GM45 targets may also work. + * Also described in docs/hcl/x200_remove_me.html + */ +struct DESCRIPTORREGIONRECORD deblobbedDescriptorStructFromFactory(struct DESCRIPTORREGIONRECORD factoryDescriptorStruct, unsigned int factoryRomSize) +{ + struct DESCRIPTORREGIONRECORD deblobbedDescriptorStruct; + memcpy(&deblobbedDescriptorStruct, &factoryDescriptorStruct, DESCRIPTORREGIONSIZE); + + /* + * set number of regions from 4 -> 2 (0 based, so 4 means 5 and 2 + * means 3. We want 3 regions: descriptor, gbe and bios, in that order) + */ + deblobbedDescriptorStruct.flMaps.flMap0.NR = 2; + + /* + * make descriptor writable from OS. This is that the user can run: + * sudo ./flashrom -p internal:laptop=force_I_want_a_brick + * from the OS, without relying an an external SPI flasher, while + * being able to write to the descriptor region (locked by default, + * until making the change below): + */ + deblobbedDescriptorStruct.masterAccessSection.flMstr1.fdRegionWriteAccess = 1; + + /* relocate BIOS region and increase size to fill image */ + deblobbedDescriptorStruct.regionSection.flReg1.BASE = 3; // 3<<FLREGIONBITSHIFT is 12KiB, which is where BIOS region is to begin (after descriptor and gbe) + deblobbedDescriptorStruct.regionSection.flReg1.LIMIT = ((factoryRomSize >> FLREGIONBITSHIFT) - 1); + /* + * ^ for example, 8MB ROM, that's 8388608 bytes. + * ^ 8388608>>FLREGIONBITSHIFT (or 8388608/4096) = 2048 bytes + * 2048 - 1 = 2047 bytes. + * This defines where the final 0x1000 (4KiB) page starts in the flash chip, because the hardware does: + * 2047<<FLREGIONBITSHIFT (or 2047*4096) = 8384512 bytes, or 7FF000 bytes + * (it can't be 0x7FFFFF because of limited number of bits) + */ + + /* set ME region size to 0 - the ME is a blob, we don't want it in libreboot */ + deblobbedDescriptorStruct.regionSection.flReg2.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<FLREGIONBITSHIFT is outside of the ROM image (8MB) size? + /* ^ datasheet says to set this to 1FFF, but FFF was previously used and also worked. */ + deblobbedDescriptorStruct.regionSection.flReg2.LIMIT = 0; + /* + * ^ 0<<FLREGIONBITSHIFT=0, so basically, the size is 0, + * ^ and the base (1FFF>>FLREGIONBITSHIFT) is well outside the higher 8MB range. + */ + + /* relocate Gbe region to begin at 4KiB (immediately after the flash descriptor) */ + deblobbedDescriptorStruct.regionSection.flReg3.BASE = 1; // 1<<FLREGIONBITSHIFT is 4096, which is where the Gbe region is to begin (after the descriptor) + deblobbedDescriptorStruct.regionSection.flReg3.LIMIT = 2; + /* + * ^ 2<<FLREGIONBITSHIFT=8192 bytes. So we are set it to size 8KiB after the first 4KiB in the flash chip. + */ + + /* set Platform region size to 0 - another blob that we don't want */ + deblobbedDescriptorStruct.regionSection.flReg4.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<FLREGIONBITSHIFT is outside of the ROM image (8MB) size? + /* ^ datasheet says to set this to 1FFF, but FFF was previously used and also worked. */ + deblobbedDescriptorStruct.regionSection.flReg4.LIMIT = 0; + /* + * ^ 0<<FLREGIONBITSHIFT=0, so basically, the size is 0, + * and the base (1FFF>>FLREGIONBITSHIFT) is well outside the higher 8MB range. + */ + + /* disable ME in ICHSTRAP0 - the ME is a blob, we don't want it in libreboot */ + deblobbedDescriptorStruct.ichStraps.ichStrap0.meDisable = 1; + + /* disable ME and TPM in MCHSTRAP0 */ + deblobbedDescriptorStruct.mchStraps.mchStrap0.meDisable = 1; // ME is a blob. not wanted in libreboot. + deblobbedDescriptorStruct.mchStraps.mchStrap0.tpmDisable = 1; // not wanted in libreboot + + /* + * disable ME, apart from chipset bugfixes (ME region should first be re-enabled above) + * This is sort of like the CPU microcode updates, but for the chipset + * (commented out below here, since blobs go against libreboot's purpose, + * but may be interesting for others) + * deblobbedDescriptorStruct.mchStraps.mchStrap0.meAlternateDisable = 1; + */ + + /* debugging */ + printf("\nOriginal (factory.rom) Descriptor start block: %08x ; Descriptor end block: %08x\n", factoryDescriptorStruct.regionSection.flReg0.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg0.LIMIT << FLREGIONBITSHIFT); + printf("Original (factory.rom) BIOS start block: %08x ; BIOS end block: %08x\n", factoryDescriptorStruct.regionSection.flReg1.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg1.LIMIT << FLREGIONBITSHIFT); + printf("Original (factory.rom) ME start block: %08x ; ME end block: %08x\n", factoryDescriptorStruct.regionSection.flReg2.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg2.LIMIT << FLREGIONBITSHIFT); + printf("Original (factory.rom) GBe start block: %08x ; GBe end block: %08x\n", factoryDescriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg3.LIMIT << FLREGIONBITSHIFT); + + printf("\nRelocated (libreboot.rom) Descriptor start block: %08x ; Descriptor end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg0.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg0.LIMIT << FLREGIONBITSHIFT); + printf("Relocated (libreboot.rom) BIOS start block: %08x ; BIOS end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg1.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg1.LIMIT << FLREGIONBITSHIFT); + printf("Relocated (libreboot.rom) ME start block: %08x ; ME end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg2.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg2.LIMIT << FLREGIONBITSHIFT); + printf("Relocated (libreboot.rom) GBe start block: %08x ; GBe end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg3.LIMIT << FLREGIONBITSHIFT); + + return deblobbedDescriptorStruct; +} diff --git a/resources/utilities/ich9deblob/descriptor/descriptor.h b/resources/utilities/ich9deblob/descriptor/descriptor.h index 847daee..a3dd340 100644 --- a/resources/utilities/ich9deblob/descriptor/descriptor.h +++ b/resources/utilities/ich9deblob/descriptor/descriptor.h @@ -31,9 +31,6 @@ #ifndef DESCRIPTORSTRUCT_H #define DESCRIPTORSTRUCT_H -#include <stdio.h> -#include <string.h> - /* size of the descriptor in bytes */ #define DESCRIPTORREGIONSIZE 0x1000 @@ -45,6 +42,12 @@ */ #define FLREGIONBITSHIFT 0xC +/* + * --------------------------------------------------------------------- + * Descriptor struct representing the data + * --------------------------------------------------------------------- + */ + struct FLVALSIG { unsigned int signature; @@ -75,12 +78,6 @@ struct FLMAP0 */ }; -/* - * --------------------------------------------------------------------- - * Descriptor struct representing the data - * --------------------------------------------------------------------- - */ - struct FLMAP1 { unsigned char FMBA : 8; @@ -255,100 +252,10 @@ struct DESCRIPTORREGIONRECORD { /* * --------------------------------------------------------------------- - * Descriptor functions + * Function declarations (keep gcc/make happy. check them in descriptor.c) * --------------------------------------------------------------------- */ - -/* - * Modify the flash descriptor, to remove the ME/AMT, and disable all other regions - * Only Flash Descriptor, Gbe and BIOS regions (BIOS region fills factoryRomSize-12k) are left. - * Tested on ThinkPad X200 and X200S. X200T and other GM45 targets may also work. - * Also described in docs/hcl/x200_remove_me.html - */ -struct DESCRIPTORREGIONRECORD deblobbedDescriptorStructFromFactory(struct DESCRIPTORREGIONRECORD factoryDescriptorStruct, unsigned int factoryRomSize) -{ - struct DESCRIPTORREGIONRECORD deblobbedDescriptorStruct; - memcpy(&deblobbedDescriptorStruct, &factoryDescriptorStruct, DESCRIPTORREGIONSIZE); - - /* - * set number of regions from 4 -> 2 (0 based, so 4 means 5 and 2 - * means 3. We want 3 regions: descriptor, gbe and bios, in that order) - */ - deblobbedDescriptorStruct.flMaps.flMap0.NR = 2; - - /* - * make descriptor writable from OS. This is that the user can run: - * sudo ./flashrom -p internal:laptop=force_I_want_a_brick - * from the OS, without relying an an external SPI flasher, while - * being able to write to the descriptor region (locked by default, - * until making the change below): - */ - deblobbedDescriptorStruct.masterAccessSection.flMstr1.fdRegionWriteAccess = 1; - - /* relocate BIOS region and increase size to fill image */ - deblobbedDescriptorStruct.regionSection.flReg1.BASE = 3; // 3<<FLREGIONBITSHIFT is 12KiB, which is where BIOS region is to begin (after descriptor and gbe) - deblobbedDescriptorStruct.regionSection.flReg1.LIMIT = ((factoryRomSize >> FLREGIONBITSHIFT) - 1); - /* - * ^ for example, 8MB ROM, that's 8388608 bytes. - * ^ 8388608>>FLREGIONBITSHIFT (or 8388608/4096) = 2048 bytes - * 2048 - 1 = 2047 bytes. - * This defines where the final 0x1000 (4KiB) page starts in the flash chip, because the hardware does: - * 2047<<FLREGIONBITSHIFT (or 2047*4096) = 8384512 bytes, or 7FF000 bytes - * (it can't be 0x7FFFFF because of limited number of bits) - */ - - /* set ME region size to 0 - the ME is a blob, we don't want it in libreboot */ - deblobbedDescriptorStruct.regionSection.flReg2.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<FLREGIONBITSHIFT is outside of the ROM image (8MB) size? - /* ^ datasheet says to set this to 1FFF, but FFF was previously used and also worked. */ - deblobbedDescriptorStruct.regionSection.flReg2.LIMIT = 0; - /* - * ^ 0<<FLREGIONBITSHIFT=0, so basically, the size is 0, - * ^ and the base (1FFF>>FLREGIONBITSHIFT) is well outside the higher 8MB range. - */ - - /* relocate Gbe region to begin at 4KiB (immediately after the flash descriptor) */ - deblobbedDescriptorStruct.regionSection.flReg3.BASE = 1; // 1<<FLREGIONBITSHIFT is 4096, which is where the Gbe region is to begin (after the descriptor) - deblobbedDescriptorStruct.regionSection.flReg3.LIMIT = 2; - /* - * ^ 2<<FLREGIONBITSHIFT=8192 bytes. So we are set it to size 8KiB after the first 4KiB in the flash chip. - */ - - /* set Platform region size to 0 - another blob that we don't want */ - deblobbedDescriptorStruct.regionSection.flReg4.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<FLREGIONBITSHIFT is outside of the ROM image (8MB) size? - /* ^ datasheet says to set this to 1FFF, but FFF was previously used and also worked. */ - deblobbedDescriptorStruct.regionSection.flReg4.LIMIT = 0; - /* - * ^ 0<<FLREGIONBITSHIFT=0, so basically, the size is 0, - * and the base (1FFF>>FLREGIONBITSHIFT) is well outside the higher 8MB range. - */ - - /* disable ME in ICHSTRAP0 - the ME is a blob, we don't want it in libreboot */ - deblobbedDescriptorStruct.ichStraps.ichStrap0.meDisable = 1; - - /* disable ME and TPM in MCHSTRAP0 */ - deblobbedDescriptorStruct.mchStraps.mchStrap0.meDisable = 1; // ME is a blob. not wanted in libreboot. - deblobbedDescriptorStruct.mchStraps.mchStrap0.tpmDisable = 1; // not wanted in libreboot - - /* - * disable ME, apart from chipset bugfixes (ME region should first be re-enabled above) - * This is sort of like the CPU microcode updates, but for the chipset - * (commented out below here, since blobs go against libreboot's purpose, - * but may be interesting for others) - * deblobbedDescriptorStruct.mchStraps.mchStrap0.meAlternateDisable = 1; - */ - - /* debugging */ - printf("\nOriginal (factory.rom) Descriptor start block: %08x ; Descriptor end block: %08x\n", factoryDescriptorStruct.regionSection.flReg0.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg0.LIMIT << FLREGIONBITSHIFT); - printf("Original (factory.rom) BIOS start block: %08x ; BIOS end block: %08x\n", factoryDescriptorStruct.regionSection.flReg1.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg1.LIMIT << FLREGIONBITSHIFT); - printf("Original (factory.rom) ME start block: %08x ; ME end block: %08x\n", factoryDescriptorStruct.regionSection.flReg2.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg2.LIMIT << FLREGIONBITSHIFT); - printf("Original (factory.rom) GBe start block: %08x ; GBe end block: %08x\n", factoryDescriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT, factoryDescriptorStruct.regionSection.flReg3.LIMIT << FLREGIONBITSHIFT); - - printf("\nRelocated (libreboot.rom) Descriptor start block: %08x ; Descriptor end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg0.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg0.LIMIT << FLREGIONBITSHIFT); - printf("Relocated (libreboot.rom) BIOS start block: %08x ; BIOS end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg1.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg1.LIMIT << FLREGIONBITSHIFT); - printf("Relocated (libreboot.rom) ME start block: %08x ; ME end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg2.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg2.LIMIT << FLREGIONBITSHIFT); - printf("Relocated (libreboot.rom) GBe start block: %08x ; GBe end block: %08x\n", deblobbedDescriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT, deblobbedDescriptorStruct.regionSection.flReg3.LIMIT << FLREGIONBITSHIFT); - - return deblobbedDescriptorStruct; -} + +struct DESCRIPTORREGIONRECORD deblobbedDescriptorStructFromFactory(struct DESCRIPTORREGIONRECORD factoryDescriptorStruct, unsigned int factoryRomSize); #endif diff --git a/resources/utilities/ich9deblob/gbe/gbe.c b/resources/utilities/ich9deblob/gbe/gbe.c new file mode 100644 index 0000000..b1c55dd --- /dev/null +++ b/resources/utilities/ich9deblob/gbe/gbe.c @@ -0,0 +1,107 @@ +/* + * gbe/gbe.c + * This file is part of the ich9deblob utility from the libreboot project + * + * Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org> + * 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/>. + */ + +/* + * Provide gbe related functions. + */ + +#include <stdio.h> +#include <string.h> + +/* structs describing the data from gbe region */ +#include "gbe.h" + +/* + * --------------------------------------------------------------------- + * Gbe functions: + * --------------------------------------------------------------------- + */ + +/* Read a 16-bit unsigned int from a supplied region buffer */ +unsigned short gbeGetRegionWordFrom8kBuffer(int index, char* regionData) +{ + return *((unsigned short*)(regionData + (index * 2))); +} + +/* + * checksum calculation for 8k gbe region (algorithm based on datasheet) + * also works for 4k buffers, so long as isBackup remains false + */ +unsigned short gbeGetChecksumFrom8kBuffer(char* regionData, unsigned short desiredValue, char isBackup) +{ + int i; + + unsigned short regionWord; /* store words here for adding to checksum */ + unsigned short checksum = 0; /* this gbe's checksum */ + unsigned short offset = 0; /* in bytes, from the start of the gbe region. */ + + /* + * if isBackup is true, use 2nd gbe region ("backup" region) + * this function uses *word* not *byte* indexes, hence the bit shift. + */ + if (isBackup) offset = GBEREGIONSIZE_4K>>1; + + for (i = 0; i < 0x3F; i++) { + regionWord = gbeGetRegionWordFrom8kBuffer(i+offset, regionData); + checksum += regionWord; + } + checksum = desiredValue - checksum; + return checksum; +} + +/* checksum calculation for 4k gbe struct (algorithm based on datasheet) */ +unsigned short gbeGetChecksumFrom4kStruct(struct GBEREGIONRECORD_4K gbeStruct4k, unsigned short desiredValue) +{ + char gbeBuffer4k[GBEREGIONSIZE_4K]; + memcpy(&gbeBuffer4k, &gbeStruct4k, GBEREGIONSIZE_4K); + return gbeGetChecksumFrom8kBuffer(gbeBuffer4k, desiredValue, 0); +} + +/* modify the gbe region extracted from a factory.rom dump */ +struct GBEREGIONRECORD_8K deblobbedGbeStructFromFactory(struct GBEREGIONRECORD_8K factoryGbeStruct8k) +{ + /* + * Correct the main gbe region. By default, the X200 (as shipped from Lenovo) comes + * with a broken main gbe region, where the backup gbe region is used instead. Modify + * it so that the main region is usable. + */ + + struct GBEREGIONRECORD_8K deblobbedGbeStruct8k; + memcpy(&deblobbedGbeStruct8k, &factoryGbeStruct8k, GBEREGIONSIZE_8K); + + deblobbedGbeStruct8k.backup.checkSum = gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.backup, 0xBABA); + memcpy(&deblobbedGbeStruct8k.main, &deblobbedGbeStruct8k.backup, GBEREGIONSIZE_4K); + + /* + * Debugging: + * calculate the 0x3F'th 16-bit uint to make the desired final checksum for GBe + * observed checksum matches (from X200 factory.rom dumps) on main: 0x3ABA 0x34BA 0x40BA. spec defined as 0xBABA. + * X200 ships with a broken main gbe region by default (invalid checksum, and more) + * The "backup" gbe regions on these machines are correct, though, and is what the machines default to + * For libreboot's purpose, we can do much better than that by fixing the main one... below is only debugging + */ + printf("\nfactory Gbe (main): calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(factoryGbeStruct8k.main, 0xBABA), factoryGbeStruct8k.main.checkSum); + printf("factory Gbe (backup) calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(factoryGbeStruct8k.backup, 0xBABA), factoryGbeStruct8k.backup.checkSum); + printf("\ndeblobbed Gbe (main): calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.main, 0xBABA), deblobbedGbeStruct8k.main.checkSum); + printf("deblobbed Gbe (backup) calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.backup, 0xBABA), deblobbedGbeStruct8k.backup.checkSum); + + return deblobbedGbeStruct8k; +} diff --git a/resources/utilities/ich9deblob/gbe/gbe.h b/resources/utilities/ich9deblob/gbe/gbe.h index 0e3f059..9647d80 100644 --- a/resources/utilities/ich9deblob/gbe/gbe.h +++ b/resources/utilities/ich9deblob/gbe/gbe.h @@ -33,9 +33,6 @@ #ifndef GBESTRUCT_H #define GBESTRUCT_H -#include <stdio.h> -#include <string.h> - /* Size of the full gbe region in bytes */ #define GBEREGIONSIZE_8K 0x2000 /* @@ -80,79 +77,13 @@ struct GBEREGIONRECORD_8K { /* * --------------------------------------------------------------------- - * Gbe functions: + * Function declarations (keep gcc/make happy. check them in gbe.c) * --------------------------------------------------------------------- */ - -/* Read a 16-bit unsigned int from a supplied region buffer */ -unsigned short gbeGetRegionWordFrom8kBuffer(int index, char* regionData) -{ - return *((unsigned short*)(regionData + (index * 2))); -} - -/* - * checksum calculation for 8k gbe region (algorithm based on datasheet) - * also works for 4k buffers, so long as isBackup remains false - */ -unsigned short gbeGetChecksumFrom8kBuffer(char* regionData, unsigned short desiredValue, char isBackup) -{ - int i; - - unsigned short regionWord; /* store words here for adding to checksum */ - unsigned short checksum = 0; /* this gbe's checksum */ - unsigned short offset = 0; /* in bytes, from the start of the gbe region. */ - - /* - * if isBackup is true, use 2nd gbe region ("backup" region) - * this function uses *word* not *byte* indexes, hence the bit shift. - */ - if (isBackup) offset = GBEREGIONSIZE_4K>>1; - - for (i = 0; i < 0x3F; i++) { - regionWord = gbeGetRegionWordFrom8kBuffer(i+offset, regionData); - checksum += regionWord; - } - checksum = desiredValue - checksum; - return checksum; -} - -/* checksum calculation for 4k gbe struct (algorithm based on datasheet) */ -unsigned short gbeGetChecksumFrom4kStruct(struct GBEREGIONRECORD_4K gbeStruct4k, unsigned short desiredValue) -{ - char gbeBuffer4k[GBEREGIONSIZE_4K]; - memcpy(&gbeBuffer4k, &gbeStruct4k, GBEREGIONSIZE_4K); - return gbeGetChecksumFrom8kBuffer(gbeBuffer4k, desiredValue, 0); -} - -/* modify the gbe region extracted from a factory.rom dump */ -struct GBEREGIONRECORD_8K deblobbedGbeStructFromFactory(struct GBEREGIONRECORD_8K factoryGbeStruct8k) -{ - /* - * Correct the main gbe region. By default, the X200 (as shipped from Lenovo) comes - * with a broken main gbe region, where the backup gbe region is used instead. Modify - * it so that the main region is usable. - */ - - struct GBEREGIONRECORD_8K deblobbedGbeStruct8k; - memcpy(&deblobbedGbeStruct8k, &factoryGbeStruct8k, GBEREGIONSIZE_8K); - - deblobbedGbeStruct8k.backup.checkSum = gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.backup, 0xBABA); - memcpy(&deblobbedGbeStruct8k.main, &deblobbedGbeStruct8k.backup, GBEREGIONSIZE_4K); - - /* - * Debugging: - * calculate the 0x3F'th 16-bit uint to make the desired final checksum for GBe - * observed checksum matches (from X200 factory.rom dumps) on main: 0x3ABA 0x34BA 0x40BA. spec defined as 0xBABA. - * X200 ships with a broken main gbe region by default (invalid checksum, and more) - * The "backup" gbe regions on these machines are correct, though, and is what the machines default to - * For libreboot's purpose, we can do much better than that by fixing the main one... below is only debugging - */ - printf("\nfactory Gbe (main): calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(factoryGbeStruct8k.main, 0xBABA), factoryGbeStruct8k.main.checkSum); - printf("factory Gbe (backup) calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(factoryGbeStruct8k.backup, 0xBABA), factoryGbeStruct8k.backup.checkSum); - printf("\ndeblobbed Gbe (main): calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.main, 0xBABA), deblobbedGbeStruct8k.main.checkSum); - printf("deblobbed Gbe (backup) calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.backup, 0xBABA), deblobbedGbeStruct8k.backup.checkSum); - - return deblobbedGbeStruct8k; -} + +unsigned short gbeGetRegionWordFrom8kBuffer(int index, char* regionData); +unsigned short gbeGetChecksumFrom8kBuffer(char* regionData, unsigned short desiredValue, char isBackup); +unsigned short gbeGetChecksumFrom4kStruct(struct GBEREGIONRECORD_4K gbeStruct4k, unsigned short desiredValue); +struct GBEREGIONRECORD_8K deblobbedGbeStructFromFactory(struct GBEREGIONRECORD_8K factoryGbeStruct8k); #endif diff --git a/resources/utilities/ich9deblob/ich9deblob.c b/resources/utilities/ich9deblob/main.c index f223d44..f469f83 100644 --- a/resources/utilities/ich9deblob/ich9deblob.c +++ b/resources/utilities/ich9deblob/main.c @@ -1,5 +1,5 @@ /* - * ich9deblob.c + * main.c * This file is part of the ich9deblob utility from the libreboot project * * Purpose: disable and remove the ME from ich9m/gm45 machines in coreboot. @@ -47,8 +47,8 @@ #include <stdio.h> #include <string.h> #include "descriptor/descriptor.h" /* structs describing what's in the descriptor region */ -#include "gbe/gbe.h" /* structs describing what's in the gbe region, plus functions that use them */ -#include "x86compatibility.c" /* compatibility checks. this utility is not portable yet. */ +#include "gbe/gbe.h" /* structs describing what's in the gbe region */ +#include "x86compatibility.h" /* system/compiler compatibility checks. This code is not portable. */ int main(int argc, char *argv[]) { diff --git a/resources/utilities/ich9deblob/x86compatibility.c b/resources/utilities/ich9deblob/x86compatibility.c index fb0bb73..b37eed6 100644 --- a/resources/utilities/ich9deblob/x86compatibility.c +++ b/resources/utilities/ich9deblob/x86compatibility.c @@ -23,9 +23,8 @@ #include <stdio.h> #include <string.h> - #include "descriptor/descriptor.h" /* structs describing what's in the descriptor region */ -#include "gbe/gbe.h" /* structs describing what's in the gbe region, plus functions that use them */ +#include "gbe/gbe.h" /* structs describing what's in the gbe region */ /* * --------------------------------------------------------------------- diff --git a/resources/utilities/ich9deblob/x86compatibility.h b/resources/utilities/ich9deblob/x86compatibility.h new file mode 100644 index 0000000..bbbfda7 --- /dev/null +++ b/resources/utilities/ich9deblob/x86compatibility.h @@ -0,0 +1,33 @@ +/* + * x86compatibility.h + * This file is part of the ich9deblob utility from the libreboot project + * + * Purpose: keep gcc/make happy. no actual code here, just function definitions. + * + * Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org> + * 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/>. + */ + +#ifndef X86COMPATIBILITY_H +#define X86COMPATIBILITY_H + +int structSizesIncorrect(struct DESCRIPTORREGIONRECORD descriptorDummy, struct GBEREGIONRECORD_8K gbe8kDummy); +int systemIsBigEndian(); +int structMembersWrongOrder(); +int structBitfieldWrongOrder(); +int systemOrCompilerIncompatible(struct DESCRIPTORREGIONRECORD descriptorStruct, struct GBEREGIONRECORD_8K gbeStruct8k); + +#endif |