diff options
Diffstat (limited to 'resources/utilities/ich9deblob/src/gbe/gbe.c')
| -rw-r--r-- | resources/utilities/ich9deblob/src/gbe/gbe.c | 34 |
1 files changed, 7 insertions, 27 deletions
diff --git a/resources/utilities/ich9deblob/src/gbe/gbe.c b/resources/utilities/ich9deblob/src/gbe/gbe.c index 5f4cffc..9a7f44f 100644 --- a/resources/utilities/ich9deblob/src/gbe/gbe.c +++ b/resources/utilities/ich9deblob/src/gbe/gbe.c @@ -32,42 +32,22 @@ * --------------------------------------------------------------------- */ -/* Read a 16-bit unsigned int from a supplied region buffer */ -uint16_t gbeGetRegionWordFrom8kBuffer(int wordOffset, uint8_t* regionData) -{ - int byteOffset = wordOffset << 1; - - uint16_t* regionDataWordAddress = (uint16_t*)(regionData+byteOffset); - uint16_t regionWord = *regionDataWordAddress; - - return regionWord; -} - /* gbe checksum calculation (algorithm based on datasheet) */ -uint16_t gbeGetChecksumFrom8kBuffer(uint8_t* regionData, uint16_t desiredValue, int byteOffset) +uint16_t gbeGetChecksumFrom8kBuffer(uint16_t* regionData, uint16_t desiredValue, int gbeRegionBase) { - int i; - int wordOffset = byteOffset >> 1; - - uint16_t regionWord; /* store words here for adding to checksum */ - uint16_t checksum = 0; /* this gbe's checksum */ + int wordOffset; + uint16_t total = 0; - for (i = 0; i < 0x3F; i++) { - regionWord = gbeGetRegionWordFrom8kBuffer(i+wordOffset, regionData); - checksum += regionWord; - } - checksum = desiredValue - checksum; + for (wordOffset = 0; wordOffset < 0x3F; wordOffset++) + total += regionData[wordOffset + (gbeRegionBase>>1)]; - return checksum; + return desiredValue - total; } /* checksum calculation for 4k gbe struct (algorithm based on datasheet) */ uint16_t gbeGetChecksumFrom4kStruct(struct GBEREGIONRECORD_4K gbeStruct4k, uint16_t desiredValue) { - uint8_t gbeBuffer4k[GBEREGIONSIZE_4K]; - memcpy(&gbeBuffer4k, &gbeStruct4k, GBEREGIONSIZE_4K); - - return gbeGetChecksumFrom8kBuffer(gbeBuffer4k, desiredValue, 0); + return gbeGetChecksumFrom8kBuffer((uint16_t*)&gbeStruct4k, desiredValue, 0); } /* modify the gbe region extracted from a factory.rom dump */ |