diff options
Diffstat (limited to 'resources/utilities/ich9deblob/descriptor/descriptor.h')
| -rw-r--r-- | resources/utilities/ich9deblob/descriptor/descriptor.h | 111 |
1 files changed, 9 insertions, 102 deletions
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 |