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Diffstat (limited to 'resources/utilities/ich9deblob/descriptor/descriptor.c')
| -rw-r--r-- | resources/utilities/ich9deblob/descriptor/descriptor.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/resources/utilities/ich9deblob/descriptor/descriptor.c b/resources/utilities/ich9deblob/descriptor/descriptor.c deleted file mode 100644 index aa3d84e..0000000 --- a/resources/utilities/ich9deblob/descriptor/descriptor.c +++ /dev/null @@ -1,170 +0,0 @@ -/* - * 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. - */ - -/* 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; - */ - - return deblobbedDescriptorStruct; -} - -/* - * --------------------------------------------------------------------- - * Debugging functions: - * --------------------------------------------------------------------- - */ - -/* - * show debugging info: descriptor region boundaries, in a 4KB struct. - */ -void printDescriptorRegionLocations(struct DESCRIPTORREGIONRECORD descriptorStruct, char* romName) -{ - printf("\n"); - - /* Descriptor region */ - printf( - "%s: Descriptor start block: %08x ; Descriptor end block: %08x\n", - romName, - descriptorStruct.regionSection.flReg0.BASE << FLREGIONBITSHIFT, - descriptorStruct.regionSection.flReg0.LIMIT << FLREGIONBITSHIFT - ); - - /* BIOS region */ - printf( - "%s: BIOS start block: %08x ; BIOS end block: %08x\n", - romName, - descriptorStruct.regionSection.flReg1.BASE << FLREGIONBITSHIFT, - descriptorStruct.regionSection.flReg1.LIMIT << FLREGIONBITSHIFT - ); - - /* ME region */ - printf( - "%s: ME start block: %08x ; ME end block: %08x\n", - romName, - descriptorStruct.regionSection.flReg2.BASE << FLREGIONBITSHIFT, - descriptorStruct.regionSection.flReg2.LIMIT << FLREGIONBITSHIFT - ); - - /* GBe region */ - printf( - "%s: GBe start block: %08x ; GBe end block: %08x\n", - romName, - descriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT, - descriptorStruct.regionSection.flReg3.LIMIT << FLREGIONBITSHIFT - ); - - /* Platform region */ - printf( - "%s: Platform start block: %08x ; GBe end block: %08x\n", - romName, - descriptorStruct.regionSection.flReg4.BASE << FLREGIONBITSHIFT, - descriptorStruct.regionSection.flReg4.LIMIT << FLREGIONBITSHIFT - ); - - return; -} |