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Diffstat (limited to 'src/common/x86compatibility.c')
| -rw-r--r-- | src/common/x86compatibility.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/common/x86compatibility.c b/src/common/x86compatibility.c new file mode 100644 index 0000000..362c634 --- /dev/null +++ b/src/common/x86compatibility.c @@ -0,0 +1,161 @@ +/* + * x86compatibility.c + * This file is part of the ich9deblob utility from the libreboot project + * + * Purpose: compiler/cpu compatibility checks. ich9deblob is not portable, yet. + * + * Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org> + * Leah Rowe <info@minifree.org> + * + * 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/>. + */ + +#include "x86compatibility.h" + +/* + * --------------------------------------------------------------------- + * x86 compatibility checking: + * --------------------------------------------------------------------- + */ + +/* fail if struct size is incorrect */ +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_8K != gbeRegion8kStructSize){ + printf("\nerror: compiler incompatibility: gbe struct length is %i bytes (should be %i)\n", gbeRegion8kStructSize, GBEREGIONSIZE_8K); + return 1; + } + + return 0; +} + +/* fail if members are presented in the wrong order */ +int structMembersWrongOrder() +{ + int i; + struct DESCRIPTORREGIONRECORD descriptorDummy; + uint8_t *meVsccTablePtr = (uint8_t*)&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 + */ + + 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("\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("\nIncorrect order.\n"); + + return 1; + } + + return 0; +} + +/* fail if bit fields are presented in the wrong order */ +int structBitfieldWrongOrder() +{ + int i; + struct DESCRIPTORREGIONRECORD descriptorDummy; + uint8_t *flMap0Ptr = (uint8_t*)&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 + */ + + if (!(*flMap0Ptr == 0xA2 && *(flMap0Ptr+1) == 0xE2 && *(flMap0Ptr+2) == 0xD2 && *(flMap0Ptr+3) == 0xE5)) + { + 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("\nIncorrect order.\n"); + + return 1; + } + + 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 (IS_BIG_ENDIAN) { + printf("big endian not supported\n"); + return 1; + } + if (structBitfieldWrongOrder()) return 1; + if (structMembersWrongOrder()) return 1; + return 0; +} |