diff options
Diffstat (limited to 'resources/utilities/ich9deblob')
| -rw-r--r-- | resources/utilities/ich9deblob/ich9deblob.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/resources/utilities/ich9deblob/ich9deblob.c b/resources/utilities/ich9deblob/ich9deblob.c index 5c49358..750477d 100644 --- a/resources/utilities/ich9deblob/ich9deblob.c +++ b/resources/utilities/ich9deblob/ich9deblob.c @@ -60,8 +60,8 @@ int main(int argc, char *argv[]) { // descriptor region. Will have actual descriptor mapped to it (from the factory.rom dump) - struct DESCRIPTORREGIONRECORD descriptorRegion; - unsigned int descriptorRegionStructSize = sizeof(descriptorRegion); + struct DESCRIPTORREGIONRECORD factoryDescriptorStruct; + unsigned int descriptorRegionStructSize = sizeof(factoryDescriptorStruct); // check compiler bit-packs in a compatible way basically, it is expected that this code will be used on x86 if (DESCRIPTORREGIONSIZE != descriptorRegionStructSize){ printf("\nerror: compiler incompatibility: descriptor struct length is %i bytes (should be %i)\n", descriptorRegionStructSize, DESCRIPTORREGIONSIZE); @@ -100,12 +100,12 @@ int main(int argc, char *argv[]) } printf("\ndescriptor region read successfully\n"); // copy descriptor buffer into descriptor struct memory - // descriptorRegion is an instance of a struct that actually + // factoryDescriptorStruct is an instance of a struct that actually // defines the locations of all these variables in the descriptor, // as defined in the datasheets. This allows us to map the extracted // descriptor over the struct so that it can then be modified // for libreboot's purpose - memcpy(&descriptorRegion, &descriptorBuffer, DESCRIPTORREGIONSIZE); + memcpy(&factoryDescriptorStruct, &descriptorBuffer, DESCRIPTORREGIONSIZE); // ----------------------------------------------------------------------------------------------- @@ -116,7 +116,7 @@ int main(int argc, char *argv[]) unsigned int flRegionBitShift = 12;// bits 12-24 are represented. // note for example, gbeRegionLocation is set to <<12 of actual address (in C). this is how the addresses // are stored in the descriptor. - unsigned int gbeRegionLocation = descriptorRegion.regionSection.flReg3.BASE << flRegionBitShift; + unsigned int gbeRegionLocation = factoryDescriptorStruct.regionSection.flReg3.BASE << flRegionBitShift; // Set offset so that we can read the data from // the gbe region @@ -145,10 +145,10 @@ int main(int argc, char *argv[]) // ----------------------------------------------------------------------------------------------- // debugging - 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); + printf("\nOriginal Descriptor start block: %08x ; Descriptor end block: %08x\n", factoryDescriptorStruct.regionSection.flReg0.BASE << flRegionBitShift, factoryDescriptorStruct.regionSection.flReg0.LIMIT << flRegionBitShift); + printf("Original BIOS start block: %08x ; BIOS end block: %08x\n", factoryDescriptorStruct.regionSection.flReg1.BASE << flRegionBitShift, factoryDescriptorStruct.regionSection.flReg1.LIMIT << flRegionBitShift); + printf("Original ME start block: %08x ; ME end block: %08x\n", factoryDescriptorStruct.regionSection.flReg2.BASE << flRegionBitShift, factoryDescriptorStruct.regionSection.flReg2.LIMIT << flRegionBitShift); + printf("Original GBe start block: %08x ; GBe end block: %08x\n", gbeRegionLocation, factoryDescriptorStruct.regionSection.flReg3.LIMIT << flRegionBitShift); // Now we need to modify the descriptor so that the ME can be excluded // from the final ROM image (libreboot one) after adding the modified @@ -156,18 +156,18 @@ int main(int argc, char *argv[]) // 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) - descriptorRegion.flMaps.flMap0.NR = 2; + factoryDescriptorStruct.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): - descriptorRegion.masterAccessSection.flMstr1.fdRegionWriteAccess = 1; + factoryDescriptorStruct.masterAccessSection.flMstr1.fdRegionWriteAccess = 1; // relocate BIOS region and increase size to fill image - descriptorRegion.regionSection.flReg1.BASE = 3; // 3<<12 is 12KiB, which is where BIOS region is to begin (after descriptor and gbe) - descriptorRegion.regionSection.flReg1.LIMIT = ((romSize >> flRegionBitShift) - 1); + factoryDescriptorStruct.regionSection.flReg1.BASE = 3; // 3<<12 is 12KiB, which is where BIOS region is to begin (after descriptor and gbe) + factoryDescriptorStruct.regionSection.flReg1.LIMIT = ((romSize >> flRegionBitShift) - 1); // ^ for example, 8MB ROM, that's 8388608 bytes. // ^ 8388608>>12 (or 8388608/4096) = 2048 bytes // 2048 - 1 = 2047 bytes. @@ -176,40 +176,40 @@ int main(int argc, char *argv[]) // (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 - descriptorRegion.regionSection.flReg2.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<12 is outside of the ROM image (8MB) size? + factoryDescriptorStruct.regionSection.flReg2.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<12 is outside of the ROM image (8MB) size? // ^ datasheet says to set this to 1FFF, but FFF was previously used and also worked. - descriptorRegion.regionSection.flReg2.LIMIT = 0; + factoryDescriptorStruct.regionSection.flReg2.LIMIT = 0; // ^ 0<<12=0, so basically, the size is 0, and the base (1FFF>>12) is well outside the higher 8MB range. // relocate Gbe region to begin at 4KiB (immediately after the flash descriptor) - descriptorRegion.regionSection.flReg3.BASE = 1; // 1<<12 is 4096, which is where the Gbe region is to begin (after the descriptor) - descriptorRegion.regionSection.flReg3.LIMIT = 2; + factoryDescriptorStruct.regionSection.flReg3.BASE = 1; // 1<<12 is 4096, which is where the Gbe region is to begin (after the descriptor) + factoryDescriptorStruct.regionSection.flReg3.LIMIT = 2; // ^ 2<<12=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 - descriptorRegion.regionSection.flReg4.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<12 is outside of the ROM image (8MB) size? + factoryDescriptorStruct.regionSection.flReg4.BASE = 0x1FFF; // setting 1FFF means setting size to 0. 1FFF<<12 is outside of the ROM image (8MB) size? // ^ datasheet says to set this to 1FFF, but FFF was previously used and also worked. - descriptorRegion.regionSection.flReg4.LIMIT = 0; + factoryDescriptorStruct.regionSection.flReg4.LIMIT = 0; // ^ 0<<12=0, so basically, the size is 0, and the base (1FFF>>12) is well outside the higher 8MB range. // disable ME in ICHSTRAP0 - the ME is a blob, we don't want it in libreboot - descriptorRegion.ichStraps.ichStrap0.meDisable = 1; + factoryDescriptorStruct.ichStraps.ichStrap0.meDisable = 1; // disable ME and TPM in MCHSTRAP0 - descriptorRegion.mchStraps.mchStrap0.meDisable = 1; // ME is a blob. not wanted in libreboot. - descriptorRegion.mchStraps.mchStrap0.tpmDisable = 1; // not wanted in libreboot + factoryDescriptorStruct.mchStraps.mchStrap0.meDisable = 1; // ME is a blob. not wanted in libreboot. + factoryDescriptorStruct.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) - // descriptorRegion.mchStraps.mchStrap0.meAlternateDisable = 1; + // factoryDescriptorStruct.mchStraps.mchStrap0.meAlternateDisable = 1; // debugging - 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); + printf("\nRelocated Descriptor start block: %08x ; Descriptor end block: %08x\n", factoryDescriptorStruct.regionSection.flReg0.BASE << flRegionBitShift, factoryDescriptorStruct.regionSection.flReg0.LIMIT << flRegionBitShift); + printf("Relocated BIOS start block: %08x ; BIOS end block: %08x\n", factoryDescriptorStruct.regionSection.flReg1.BASE << flRegionBitShift, factoryDescriptorStruct.regionSection.flReg1.LIMIT << flRegionBitShift); + printf("Relocated ME start block: %08x ; ME end block: %08x\n", factoryDescriptorStruct.regionSection.flReg2.BASE << flRegionBitShift, factoryDescriptorStruct.regionSection.flReg2.LIMIT << flRegionBitShift); + printf("Relocated GBe start block: %08x ; GBe end block: %08x\n", factoryDescriptorStruct.regionSection.flReg3.BASE << flRegionBitShift, factoryDescriptorStruct.regionSection.flReg3.LIMIT << flRegionBitShift); // ---------------------------------------------------------------------------------------------------------------- @@ -217,7 +217,7 @@ int main(int argc, char *argv[]) // can more easily be written to files: // deblobbed descriptor region char deblobbedDescriptorBuffer[DESCRIPTORREGIONSIZE]; - memcpy(&deblobbedDescriptorBuffer, &descriptorRegion, DESCRIPTORREGIONSIZE); + memcpy(&deblobbedDescriptorBuffer, &factoryDescriptorStruct, DESCRIPTORREGIONSIZE); // delete old file before continuing remove(deblobbedDescriptorFilename); |