.TH "probe_irq_mask" 9 "probe_irq_mask" "25 May 1998" "Kernel Hacker's Manual" LINUX
.SH NAME
probe_irq_mask \-  scan a bitmap of interrupt lines
.SH SYNOPSIS
.B "unsigned int" probe_irq_mask
.BI "(unsigned long " val ");"
.SH ARGUMENTS
.IP "val" 12
	mask of interrupts to consider
.SH "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.
.SH "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.