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/*
* 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>
* Francis Rowe <info@gluglug.org.uk>
*
* 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 <stdio.h>
#include <string.h>
#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;
}
/* endianness check. big endian forced to fail */
int systemIsBigEndian()
{
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; /* you got the good half of the steak */
}
/* 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
*/
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;
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
*/
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 (systemIsBigEndian()) return 1;
if (structBitfieldWrongOrder()) return 1;
if (structMembersWrongOrder()) return 1;
return 0;
}
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