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Quellcode

dd if=/dev/mem bs=1k skip=768 count=256 2>/dev/null | strings -n 8
...
Memory parity
ECC memory error
 Type (S)hut off NMI,
Entering Setup    
Phoenix ROM BIOS PLUS Version 1.10 A01
www.dell.com
...
OptiPlex GX520
OptiPlex GX520Dell System GX520Dell System 
BIOS version 
...
cDELL  GX520  
DELL  GX520  
DELL  GX520  
... 

Quellcode

/* gcc  cmos-write-numlock.c  -o cmos-write-numlock  -Wall */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
//#include <asm/io.h> // ?? fuckin ubuntu 11.10 ??
#include <sys/io.h>
#define CMOS_PORT_ADDRESS 0x70
#define CMOS_PORT_DATA    0x71

char * char2bin(unsigned char c2bs);

// outb(val, prt)
int main(int argc, char *argv[])
{
unsigned char port0x71val, portsetval/*, bitmask=0xFF*/;
int turn_nl_on = 0;

   printf( "\nSET NUM LOCK IN DA BIOS\n-----------------------\n" );

   if (ioperm(CMOS_PORT_ADDRESS, 2, 1))  //  Port permission set 1    for ports 0x70 and 0x71
   {   perror("ioperm");  exit (1);
   } //outb(val, port)

    outb( 0x11,CMOS_PORT_ADDRESS );     port0x71val = inb( CMOS_PORT_DATA );
    printf( "offset 0x11 -%s- = 0x%02x\n" ,char2bin(port0x71val) , port0x71val );
    if( (port0x71val & (unsigned char)0x01) == (unsigned char)0x01 ) {  printf( "Numlock bios ON\n"  );  }
    if( (port0x71val & (unsigned char)0x01) == (unsigned char)0x00 ) {  printf( "Numlock bios OFF\n"  );  }


   if( (argv[1][0]=='o') && (argv[1][1]=='n') ){  printf("set ON\n");  turn_nl_on = 1;  }
   else{ if( (argv[1][0]=='o')&&(argv[1][1]=='f')&&(argv[1][2]=='f') ){  printf("set OFF\n");  turn_nl_on = 0;  }
         else{  printf("Usage :\n%s  on|off|testonly\n\n",argv[0]);  goto permission0;  }
   }    

   if(turn_nl_on == 1){   portsetval = port0x71val | 0x01; }  // set bit 0 to 1
   else{                  portsetval = port0x71val & 0xFE; }  // clr bit 0 to 0
       printf( "offset 0x11 -%s- = 0x%02x\n" ,char2bin(portsetval) , portsetval );
// NUMLOCK byte offset 11  bit 0
// value (bitmask) [*][*][*][*] [*][*][*][*][1|0]  =  AND 0xff 0xfe
  unsigned char porttmp =  inb(CMOS_PORT_ADDRESS);
//  printf( "inb[%x] = %02x\n" , CMOS_PORT_ADDRESS , porttmp );
  outb( (porttmp & 0x80) | (0x11 & 0x7F) , CMOS_PORT_ADDRESS ) ;
  outb( /*0x15*/portsetval, CMOS_PORT_DATA );
  printf( "inb[%x] = %02x\n" , CMOS_PORT_ADDRESS , porttmp );


permission0:
  if (ioperm(CMOS_PORT_ADDRESS, 2, 0))  // Port permission set 0
  {  perror("ioperm");  exit(1);  }
        //exit (0);
    return 0;
}  // main()



char * char2bin(unsigned char c2bs)
{  static char buffa[9];  int i;
   for(i=0;i<8;i++) {  if( ((c2bs>>(7-i))&1) == 1){ buffa[i]='1'; }else{ buffa[i]='0'; }   }
  return & buffa[0];
}