Provided by: kernel-doc-2.4.27_2.4.27-12_all bug

NAME

       probe_irq_mask -  scan a bitmap of interrupt lines

SYNOPSIS

       unsigned int probe_irq_mask (unsigned long val);

ARGUMENTS

       val              mask of interrupts to consider

DESCRIPTION

       Scan  the  ISA  bus  interrupt  lines  and  return  a  bitmap of active
       interrupts. The interrupt probe logic state is  then  returned  to  its
       previous value.

NOTE

        we  need to scan all the irq’s even though we will only return ISA irq
       numbers - just so that we reset them all to a known state.