diff options
Diffstat (limited to 'resources/utilities/ich9deblob/x86compatibility.c')
| -rw-r--r-- | resources/utilities/ich9deblob/x86compatibility.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/resources/utilities/ich9deblob/x86compatibility.c b/resources/utilities/ich9deblob/x86compatibility.c new file mode 100644 index 0000000..80aa062 --- /dev/null +++ b/resources/utilities/ich9deblob/x86compatibility.c @@ -0,0 +1,141 @@ +#include <stdio.h> +#include <string.h> + +#include "ich9desc.h" // structs describing what's in the descriptor region +#include "ich9gbe.h" // structs describing what's in the gbe region + +// --------------------------------------------------------------------- +// x86 compatibility checking: +// --------------------------------------------------------------------- + +// Basically, this should only return true on non-x86 machines +int structSizesIncorrect(struct DESCRIPTORREGIONRECORD descriptorDummy, struct GBEREGIONRECORD_8K gbe8kDummy) { + unsigned int descriptorRegionStructSize = sizeof(descriptorDummy); + unsigned int gbeRegion8kStructSize = sizeof(gbe8kDummy); + // 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); + return 1; + } + if (GBEREGIONSIZE != gbeRegion8kStructSize){ + printf("\nerror: compiler incompatibility: gbe struct length is %i bytes (should be %i)\n", gbeRegion8kStructSize, GBEREGIONSIZE); + return 1; + } + return 0; +} + +int systemIsBigEndian() { + // endianness check. big endian forced to fail + unsigned short steak = 0xBEEF; + unsigned char *grill = (unsigned char*)&steak; + if (*grill==0xBE) { + printf("\nunsigned short 0xBEEF: first byte should be EF, but it's BE. Your system is big endian, and unsupported (only little endian is tested)\n"); + return 1; + } + return 0; +} + +// fail if members are presented in the wrong order +int structMembersWrongOrder() +{ + int i; + struct DESCRIPTORREGIONRECORD descriptorDummy; + unsigned char *meVsccTablePtr = (unsigned char*)&descriptorDummy.meVsccTable; + + // These do not use bitfields. + descriptorDummy.meVsccTable.jid0 = 0x01020304; // unsigned int 32-bit + descriptorDummy.meVsccTable.vscc0 = 0x10203040; // unsigned int 32-bit + descriptorDummy.meVsccTable.jid1 = 0x11223344; // unsigned int 32-bit + descriptorDummy.meVsccTable.vscc1 = 0x05060708; // unsigned int 32-bit + descriptorDummy.meVsccTable.jid2 = 0x50607080; // unsigned int 32-bit + descriptorDummy.meVsccTable.vscc2 = 0x55667788; // unsigned int 32-bit + descriptorDummy.meVsccTable.padding[0] = 0xAA; // unsigned char 8-bit + descriptorDummy.meVsccTable.padding[1] = 0xBB; // unsigned char 8-bit + descriptorDummy.meVsccTable.padding[2] = 0xCC; // unsigned char 8-bit + descriptorDummy.meVsccTable.padding[3] = 0xDD; // unsigned char 8-bit + + // Look from the top down, and concatenate the unsigned ints but + // with each unsigned in little endian order. + // Then, concatenate the unsigned chars in big endian order. (in the padding array) + + // combined, these should become: + // 01020304 10203040 11223344 05060708 50607080 55667788 AA BB CC DD (ignore this. big endian. just working it out manually:) + // 04030201 40302010 44332211 08070605 80706050 88776655 AA BB CC DD (ignore this. not byte-separated, just working it out:) + // 04 03 02 01 40 30 20 10 44 33 22 11 08 07 06 05 80 70 60 50 88 77 66 55 AA BB CC DD <-- it should match this + + printf("\nStruct member order check (descriptorDummy.meVsccTable) with junk/dummy data:"); + printf("\nShould be: 04 03 02 01 40 30 20 10 44 33 22 11 08 07 06 05 80 70 60 50 88 77 66 55 aa bb cc dd "); + printf("\nAnd it is: "); + + for (i = 0; i < 28; i++) { + printf("%02x ", *(meVsccTablePtr + i)); + } + printf("\n"); + + if ( + ! + ( + *meVsccTablePtr == 0x04 && *(meVsccTablePtr+1) == 0x03 && *(meVsccTablePtr+2) == 0x02 && *(meVsccTablePtr+3) == 0x01 + && *(meVsccTablePtr+4) == 0x40 && *(meVsccTablePtr+5) == 0x30 && *(meVsccTablePtr+6) == 0x20 && *(meVsccTablePtr+7) == 0x10 + && *(meVsccTablePtr+8) == 0x44 && *(meVsccTablePtr+9) == 0x33 && *(meVsccTablePtr+10) == 0x22 && *(meVsccTablePtr+11) == 0x11 + && *(meVsccTablePtr+12) == 0x08 && *(meVsccTablePtr+13) == 0x07 && *(meVsccTablePtr+14) == 0x06 && *(meVsccTablePtr+15) == 0x05 + && *(meVsccTablePtr+16) == 0x80 && *(meVsccTablePtr+17) == 0x70 && *(meVsccTablePtr+18) == 0x60 && *(meVsccTablePtr+19) == 0x50 + && *(meVsccTablePtr+20) == 0x88 && *(meVsccTablePtr+21) == 0x77 && *(meVsccTablePtr+22) == 0x66 && *(meVsccTablePtr+23) == 0x55 + && *(meVsccTablePtr+24) == 0xAA && *(meVsccTablePtr+25) == 0xBB && *(meVsccTablePtr+26) == 0xCC && *(meVsccTablePtr+27) == 0xDD + ) + ) { + printf("Incorrect order.\n"); + return 1; + } + printf("Correct order.\n"); + return 0; +} + +// fail if bit fields are presented in the wrong order +int structBitfieldWrongOrder() +{ + int i; + struct DESCRIPTORREGIONRECORD descriptorDummy; + unsigned char *flMap0Ptr = (unsigned char*)&descriptorDummy.flMaps.flMap0; + + descriptorDummy.flMaps.flMap0.FCBA = 0xA2; // :8 --> 10100010 + descriptorDummy.flMaps.flMap0.NC = 0x02; // :2 --> 10 + descriptorDummy.flMaps.flMap0.reserved1 = 0x38; // :6 --> 111000 + descriptorDummy.flMaps.flMap0.FRBA = 0xD2; // :8 --> 11010010 + descriptorDummy.flMaps.flMap0.NR = 0x05; // :3 --> 101 + descriptorDummy.flMaps.flMap0.reserved2 = 0x1C; // :5 --> 11100 + + // Look from the top bottom up, and concatenate the binary strings. + // Then, convert the 8-bit groups to hex and reverse the (8-bit)byte order + + // combined, these should become (in memory), in binary: + // 10100010 11100010 11010010 11100101 + // or in hex: + // A2 E2 D2 E5 + + printf("\nBitfield order check (descriptorDummy.flMaps.flMaps0) with junk/dummy data:"); + printf("\nShould be: a2 e2 d2 e5 "); + printf("\nAnd it is: "); + + for (i = 0; i < 4; i++) { + printf("%02x ", *(flMap0Ptr + i)); + } + printf("\n"); + + if (!(*flMap0Ptr == 0xA2 && *(flMap0Ptr+1) == 0xE2 && *(flMap0Ptr+2) == 0xD2 && *(flMap0Ptr+3) == 0xE5)) { + printf("Incorrect order.\n"); + return 1; + } + printf("Correct order.\n"); + return 0; +} + +// Compatibility checks. This version of ich9deblob is not yet porable. +int systemOrCompilerIncompatible(struct DESCRIPTORREGIONRECORD descriptorStruct, struct GBEREGIONRECORD_8K gbeStruct8k) +{ + if (structSizesIncorrect(descriptorStruct, gbeStruct8k)) return 1; + if (systemIsBigEndian()) return 1; + if (structBitfieldWrongOrder()) return 1; + if (structMembersWrongOrder()) return 1; + return 0; +} |