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Bochs/bochs/bios/biossums.c
Volker Ruppert 70ea45b83d Moved and updated biossums.txt to the developer doc. 
Small fix in biossums.c.
2020-01-04 22:46:00 +00:00

590 lines
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/*
* $Id$
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* biossums.c --- written by Eike W. for the Bochs BIOS */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
typedef unsigned char byte;
void check( int value, char* message );
#define LEN_BIOS_DATA 0x10000
#define MAX_OFFSET (LEN_BIOS_DATA - 1)
#define BIOS_OFFSET 0xFFFF
long chksum_bios_get_offset( byte* data, long offset );
byte chksum_bios_calc_value( byte* data, long offset );
byte chksum_bios_get_value( byte* data, long offset );
void chksum_bios_set_value( byte* data, long offset, byte value );
#define _32__LEN 9
#define _32__CHKSUM 10
#define _32__MINHDR 16
long chksum__32__get_offset( byte* data, long offset );
byte chksum__32__calc_value( byte* data, long offset );
byte chksum__32__get_value( byte* data, long offset );
void chksum__32__set_value( byte* data, long offset, byte value );
#define _MP__LEN 8
#define _MP__CHKSUM 10
#define _MP__MINHDR 16
long chksum__mp__get_offset( byte* data, long offset );
byte chksum__mp__calc_value( byte* data, long offset );
byte chksum__mp__get_value( byte* data, long offset );
void chksum__mp__set_value( byte* data, long offset, byte value );
#define PCMP_BASELEN 4
#define PCMP_CHKSUM 7
#define PCMP_EXT_LEN 40
#define PCMP_EXT_CHKSUM 42
#define PCMP_MINHDR 42
long chksum_pcmp_get_offset( byte* data, long offset );
byte chksum_pcmp_calc_value( byte* data, long offset );
byte chksum_pcmp_get_value( byte* data, long offset );
void chksum_pcmp_set_value( byte* data, long offset, byte value );
#define _PIR_LEN 6
#define _PIR_CHKSUM 31
#define _PIR_MINHDR 32
long chksum__pir_get_offset( byte *data, long offset );
byte chksum__pir_calc_value( byte* data, long offset );
byte chksum__pir_get_value( byte* data, long offset );
void chksum__pir_set_value( byte* data, long offset, byte value );
#define _PNP_LEN 5
#define _PNP_CHKSUM 8
#define _PNP_MINHDR 32
long chksum__pnp_get_offset( byte *data, long offset );
byte chksum__pnp_calc_value( byte* data, long offset );
byte chksum__pnp_get_value( byte* data, long offset );
void chksum__pnp_set_value( byte* data, long offset, byte value );
byte bios_data[LEN_BIOS_DATA];
long bios_len;
int main(int argc, char* argv[]) {
FILE* stream;
long offset, tmp_offset;
byte cur_val = 0, new_val = 0;
int arg = 1, hits, pad = 0;
if ((argc == 3) && (!strcmp(argv[1], "-pad"))) {
pad = 1;
arg = 2;
} else if (argc != 2) {
printf("Error. Need a file-name as an argument.\n");
exit(EXIT_FAILURE);
}
memset(bios_data, 0xff, LEN_BIOS_DATA);
if ((stream = fopen(argv[arg], "rb")) == NULL) {
printf("Error opening %s for reading.\n", argv[arg]);
exit(EXIT_FAILURE);
}
bios_len = fread(bios_data, 1, LEN_BIOS_DATA, stream);
if ((bios_len < LEN_BIOS_DATA) && (pad == 0)) {
printf("Error reading 64KBytes from %s.\n", argv[arg]);
fclose(stream);
exit(EXIT_FAILURE);
}
fclose(stream);
if (pad == 1) goto write_bios;
hits = 0;
offset = 0L;
while( (tmp_offset = chksum__32__get_offset( bios_data, offset )) != -1L ) {
offset = tmp_offset;
cur_val = chksum__32__get_value( bios_data, offset );
new_val = chksum__32__calc_value( bios_data, offset );
printf( "\n\nPCI-Bios header at: 0x%4lX\n", offset );
printf( "Current checksum: 0x%02X\n", cur_val );
printf( "Calculated checksum: 0x%02X ", new_val );
hits++;
}
if( hits == 1 && cur_val != new_val ) {
printf( "Setting checksum." );
chksum__32__set_value( bios_data, offset, new_val );
}
if( hits >= 2 ) {
printf( "Multiple PCI headers! No checksum set." );
}
if( hits ) {
printf( "\n" );
}
hits = 0;
offset = 0L;
while( (tmp_offset = chksum__mp__get_offset( bios_data, offset )) != -1L ) {
offset = tmp_offset;
cur_val = chksum__mp__get_value( bios_data, offset );
new_val = chksum__mp__calc_value( bios_data, offset );
printf( "\n\nMP header at: 0x%4lX\n", offset );
printf( "Current checksum: 0x%02X\n", cur_val );
printf( "Calculated checksum: 0x%02X ", new_val );
hits++;
}
if( hits == 1 && cur_val != new_val ) {
printf( "Setting checksum." );
chksum__mp__set_value( bios_data, offset, new_val );
}
if( hits >= 2 ) {
printf( "Warning! Multiple MP headers. No checksum set." );
}
if( hits ) {
printf( "\n" );
}
hits = 0;
offset = 0L;
while( (tmp_offset = chksum_pcmp_get_offset( bios_data, offset )) != -1L ) {
offset = tmp_offset;
cur_val = chksum_pcmp_get_value( bios_data, offset );
new_val = chksum_pcmp_calc_value( bios_data, offset );
printf( "\n\nPCMP header at: 0x%4lX\n", offset );
printf( "Current checksum: 0x%02X\n", cur_val );
printf( "Calculated checksum: 0x%02X ", new_val );
hits++;
}
if( hits == 1 && cur_val != new_val ) {
printf( "Setting checksum." );
chksum_pcmp_set_value( bios_data, offset, new_val );
}
if( hits >= 2 ) {
printf( "Warning! Multiple PCMP headers. No checksum set." );
}
if( hits ) {
printf( "\n" );
}
hits = 0;
offset = 0L;
while( (tmp_offset = chksum__pir_get_offset( bios_data, offset )) != -1L ) {
offset = tmp_offset;
cur_val = chksum__pir_get_value( bios_data, offset );
new_val = chksum__pir_calc_value( bios_data, offset );
printf( "\n\n$PIR header at: 0x%4lX\n", offset );
printf( "Current checksum: 0x%02X\n", cur_val );
printf( "Calculated checksum: 0x%02X ", new_val );
hits++;
}
if( hits == 1 && cur_val != new_val ) {
printf( "Setting checksum." );
chksum__pir_set_value( bios_data, offset, new_val );
}
if( hits >= 2 ) {
printf( "Warning! Multiple $PIR headers. No checksum set." );
}
if( hits ) {
printf( "\n" );
}
hits = 0;
offset = 0L;
while( (tmp_offset = chksum__pnp_get_offset( bios_data, offset )) != -1L ) {
offset = tmp_offset;
cur_val = chksum__pnp_get_value( bios_data, offset );
new_val = chksum__pnp_calc_value( bios_data, offset );
printf( "\n\n$PnP header at: 0x%4lX\n", offset );
printf( "Current checksum: 0x%02X\n", cur_val );
printf( "Calculated checksum: 0x%02X ", new_val );
hits++;
}
if( hits == 1 && cur_val != new_val ) {
printf( "Setting checksum." );
chksum__pnp_set_value( bios_data, offset, new_val );
}
if( hits >= 2 ) {
printf( "Warning! Multiple $PnP headers. No checksum set." );
}
if( hits ) {
printf( "\n" );
}
offset = 0L;
offset = chksum_bios_get_offset( bios_data, offset );
cur_val = chksum_bios_get_value( bios_data, offset );
new_val = chksum_bios_calc_value( bios_data, offset );
printf( "\n\nBios checksum at: 0x%4lX\n", offset );
printf( "Current checksum: 0x%02X\n", cur_val );
printf( "Calculated checksum: 0x%02X ", new_val );
if( cur_val != new_val ) {
printf( "Setting checksum." );
chksum_bios_set_value( bios_data, offset, new_val );
}
printf( "\n" );
write_bios:
if ((stream = fopen(argv[arg], "wb")) == NULL) {
printf("Error opening %s for writing.\n", argv[arg]);
exit(EXIT_FAILURE);
}
if (fwrite(bios_data, 1, LEN_BIOS_DATA, stream) < LEN_BIOS_DATA) {
printf("Error writing 64KBytes to %s.\n", argv[arg]);
fclose(stream);
exit(EXIT_FAILURE);
}
fclose(stream);
return(EXIT_SUCCESS);
}
void check(int okay, char* message) {
if (!okay) {
printf("\n\nError. %s.\n", message);
exit(EXIT_FAILURE);
}
}
long chksum_bios_get_offset( byte* data, long offset ) {
return( BIOS_OFFSET );
}
byte chksum_bios_calc_value( byte* data, long offset ) {
int i;
byte sum;
sum = 0;
for( i = 0; i < MAX_OFFSET; i++ ) {
sum = sum + *( data + i );
}
sum = -sum; /* iso ensures -s + s == 0 on unsigned types */
return( sum );
}
byte chksum_bios_get_value( byte* data, long offset ) {
return( *( data + BIOS_OFFSET ) );
}
void chksum_bios_set_value( byte* data, long offset, byte value ) {
*( data + BIOS_OFFSET ) = value;
}
byte chksum__32__calc_value( byte* data, long offset ) {
int i;
int len;
byte sum;
check( offset + _32__MINHDR <= MAX_OFFSET, "_32_ header out of bounds" );
len = *( data + offset + _32__LEN ) << 4;
check( offset + len <= MAX_OFFSET, "_32_ header-length out of bounds" );
sum = 0;
for( i = 0; i < len; i++ ) {
if( i != _32__CHKSUM ) {
sum = sum + *( data + offset + i );
}
}
sum = -sum;
return( sum );
}
long chksum__32__get_offset( byte* data, long offset ) {
long result = -1L;
offset = offset + 0x0F;
offset = offset & ~( 0x0F );
while( offset + 16 < MAX_OFFSET ) {
offset = offset + 16;
if( *( data + offset + 0 ) == '_' && \
*( data + offset + 1 ) == '3' && \
*( data + offset + 2 ) == '2' && \
*( data + offset + 3 ) == '_' ) {
result = offset;
break;
}
}
return( result );
}
byte chksum__32__get_value( byte* data, long offset ) {
check( offset + _32__CHKSUM <= MAX_OFFSET, "PCI-Bios checksum out of bounds" );
return( *( data + offset + _32__CHKSUM ) );
}
void chksum__32__set_value( byte* data, long offset, byte value ) {
check( offset + _32__CHKSUM <= MAX_OFFSET, "PCI-Bios checksum out of bounds" );
*( data + offset + _32__CHKSUM ) = value;
}
byte chksum__mp__calc_value( byte* data, long offset ) {
int i;
int len;
byte sum;
check( offset + _MP__MINHDR <= MAX_OFFSET, "_MP_ header out of bounds" );
len = *( data + offset + _MP__LEN ) << 4;
check( offset + len <= MAX_OFFSET, "_MP_ header-length out of bounds" );
sum = 0;
for( i = 0; i < len; i++ ) {
if( i != _MP__CHKSUM ) {
sum = sum + *( data + offset + i );
}
}
sum = -sum;
return( sum );
}
long chksum__mp__get_offset( byte* data, long offset ) {
long result = -1L;
offset = offset + 0x0F;
offset = offset & ~( 0x0F );
while( offset + 16 < MAX_OFFSET ) {
offset = offset + 16;
if( *( data + offset + 0 ) == '_' && \
*( data + offset + 1 ) == 'M' && \
*( data + offset + 2 ) == 'P' && \
*( data + offset + 3 ) == '_' ) {
result = offset;
break;
}
}
return( result );
}
byte chksum__mp__get_value( byte* data, long offset ) {
check( offset + _MP__CHKSUM <= MAX_OFFSET, "MP checksum out of bounds" );
return( *( data + offset + _MP__CHKSUM ) );
}
void chksum__mp__set_value( byte* data, long offset, byte value ) {
check( offset + _MP__CHKSUM <= MAX_OFFSET, "MP checksum out of bounds" );
*( data + offset + _MP__CHKSUM ) = value;
}
byte chksum_pcmp_calc_value( byte* data, long offset ) {
int i;
int len;
byte sum;
check( offset + PCMP_MINHDR <= MAX_OFFSET, "PCMP header out of bounds" );
len = *( data + offset + PCMP_BASELEN ) + \
( *( data + offset + PCMP_BASELEN + 1 ) << 8 );
check( offset + len <= MAX_OFFSET, "PCMP header-length out of bounds" );
if( *( data + offset + PCMP_EXT_LEN ) | \
*( data + offset + PCMP_EXT_LEN + 1 ) | \
*( data + offset + PCMP_EXT_CHKSUM ) ) {
check( 0, "PCMP header indicates extended tables (unsupported)" );
}
sum = 0;
for( i = 0; i < len; i++ ) {
if( i != PCMP_CHKSUM ) {
sum = sum + *( data + offset + i );
}
}
sum = -sum;
return( sum );
}
long chksum_pcmp_get_offset( byte* data, long offset ) {
long result = -1L;
offset = offset + 0x0F;
offset = offset & ~( 0x0F );
while( offset + 16 < MAX_OFFSET ) {
offset = offset + 16;
if( *( data + offset + 0 ) == 'P' && \
*( data + offset + 1 ) == 'C' && \
*( data + offset + 2 ) == 'M' && \
*( data + offset + 3 ) == 'P' ) {
result = offset;
break;
}
}
return( result );
}
byte chksum_pcmp_get_value( byte* data, long offset ) {
check( offset + PCMP_CHKSUM <= MAX_OFFSET, "PCMP checksum out of bounds" );
return( *( data + offset + PCMP_CHKSUM ) );
}
void chksum_pcmp_set_value( byte* data, long offset, byte value ) {
check( offset + PCMP_CHKSUM <= MAX_OFFSET, "PCMP checksum out of bounds" );
*( data + offset + PCMP_CHKSUM ) = value;
}
byte chksum__pir_calc_value( byte* data, long offset ) {
int i;
int len;
byte sum;
check( offset + _PIR_MINHDR <= MAX_OFFSET, "$PIR header out of bounds" );
len = *( data + offset + _PIR_LEN ) + \
( *( data + offset + _PIR_LEN + 1 ) << 8 );
check( offset + len <= MAX_OFFSET, "$PIR header-length out of bounds" );
sum = 0;
for( i = 0; i < len; i++ ) {
if( i != _PIR_CHKSUM ) {
sum = sum + *( data + offset + i );
}
}
sum = -sum;
return( sum );
}
long chksum__pir_get_offset( byte* data, long offset ) {
long result = -1L;
offset = offset + 0x0F;
offset = offset & ~( 0x0F );
while( offset + 16 < MAX_OFFSET ) {
offset = offset + 16;
if( *( data + offset + 0 ) == '$' && \
*( data + offset + 1 ) == 'P' && \
*( data + offset + 2 ) == 'I' && \
*( data + offset + 3 ) == 'R' ) {
result = offset;
break;
}
}
return( result );
}
byte chksum__pir_get_value( byte* data, long offset ) {
check( offset + _PIR_CHKSUM <= MAX_OFFSET, "$PIR checksum out of bounds" );
return( *( data + offset + _PIR_CHKSUM ) );
}
void chksum__pir_set_value( byte* data, long offset, byte value ) {
check( offset + _PIR_CHKSUM <= MAX_OFFSET, "$PIR checksum out of bounds" );
*( data + offset + _PIR_CHKSUM ) = value;
}
byte chksum__pnp_calc_value( byte* data, long offset ) {
int i;
int len;
byte sum;
check( offset + _PNP_MINHDR <= MAX_OFFSET, "$PnP header out of bounds" );
len = *( data + offset + _PNP_LEN );
check( offset + len <= MAX_OFFSET, "$PnP header-length out of bounds" );
sum = 0;
for( i = 0; i < len; i++ ) {
if( i != _PNP_CHKSUM ) {
sum = sum + *( data + offset + i );
}
}
sum = -sum;
return( sum );
}
long chksum__pnp_get_offset( byte* data, long offset ) {
long result = -1L;
offset = offset + 0x0F;
offset = offset & ~( 0x0F );
while( offset + 16 < MAX_OFFSET ) {
offset = offset + 16;
if( *( data + offset + 0 ) == '$' && \
*( data + offset + 1 ) == 'P' && \
*( data + offset + 2 ) == 'n' && \
*( data + offset + 3 ) == 'P' ) {
result = offset;
break;
}
}
return( result );
}
byte chksum__pnp_get_value( byte* data, long offset ) {
check( offset + _PNP_CHKSUM <= MAX_OFFSET, "$PnP checksum out of bounds" );
return( *( data + offset + _PNP_CHKSUM ) );
}
void chksum__pnp_set_value( byte* data, long offset, byte value ) {
check( offset + _PNP_CHKSUM <= MAX_OFFSET, "$PnP checksum out of bounds" );
*( data + offset + _PNP_CHKSUM ) = value;
}
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