Segmentation fault with outb()

[Raja.Hayek@xxxxxxxxxxxxxx]

I am trying to to set up my ports for
IO with the low level inb() and outb() in the code below. However, as soon
as I write to the COM port, I get a segmentation fault. The hardware uses
a lava card with 8 COM ports available.

I know that similar code works in module
form, whereby I insmod the module, and set up my ports using in the init_module()
function. Here, however, I am trying to build it into a regular executable.
But is that the reason?

TIA.

Raja Hayek.


// some includes up here...

#define  COM3    0x100
               
               //
the address given to COM3 as per setserial

static const int BRDL   = 0;  
               
             // Baud
rate divisor register offset
static const int BRDH   = 1;
static const int IER    =
1;
static const int LCR    =
3;                
               //
line control register

static const int LCR_data = 0x03;  
               
     // 8 bits, no parity, 1 stop bit
static const int LCR_access_baudrate
= 0x80;        // allow access to the baud
rate divisor registers

static const int baud19200high  =
0;
static const int baud19200low  
= 6;

static const int IER_data   = 0;
               
       // disable all COM interrupts

int main()
{
        outb(LCR_access_baudrate,
COM3+LCR);        // COM3: this line causes
segmentation fault
        outb(baud19200low,
COM3+BRDL);                //
Setup the baud rate divisor
        outb(baud19200high,
COM3+BRDH);
        outb(LCR_data,
COM3+LCR);                
       // Access TX and RX data ports
        outb(IER_data,
COM3+IER);                
       // Setup interrupt masks

// more code down here...