[rtl] (Un)masking hardware interrupts

[Luis Balona <lab@da.saao.ac.za>]

I have been trying to use a custom-built timing card which uses IRQ5.  I
cannot enable IRQ5 interrupts, though I can see the timing pulses on the
bus.  This is a fragment of the code I use:

-------------------------------

#define MASTER 0x20
#define IRQ5 0xd

static int output = 0xffff ;

/* Test interrupt handler toggles all LPT ports */

void handler(void)
  {
  while ( 1 ) {
   outb(output, LPT_PORT) ;
   output = ~output ;
   }
  }



int init_module(void)
{
 unsigned char int_mask ;
.....


/* Replace IRQ5 vector with intrp() */
  free_RTirq(IRQ5) ;
  request_RTirq(IRQ5, handler ) ;

....

/* Unmask IRQ5 interrupts */
 
  int_mask = inb ( MASTER+1 ) ;    /* Read the current interrupt mask */
  outb ( int_mask & 0xdf, MASTER+1 ) ; /*  Unmask IRQ5 */

.....

  }


Does anyone have any ideas why this doesn't work?  I tried masking and
unmasking interrupts on the example "rtc_toggle.c" (in /parallel), with
inconsistent results.  Is it forbidden to mask/unmask interrupts in RTLinux?

Many thanks

Luis Balona                                     lab@saao.ac.za
South African Astronomical Observatory
Cape Town
South Africa

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