Date: Thu, 17 Jun 2004 08:19:58 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Roman Kurakin <rik@cronyx.ru> Cc: freebsd-current@freebsd.org Subject: Re: How to catch interrupt Message-ID: <20040617080547.F8883@gamplex.bde.org> In-Reply-To: <40D070B7.5000009@cronyx.ru> References: <40D070B7.5000009@cronyx.ru>
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On Wed, 16 Jun 2004, Roman Kurakin wrote: > How to catch interrupt for ISA device before registering handler for it? This cannot be done without duplicating lots of interrupt handler registration code. (Actually only a little for a quick MD hack: just setidt() to point to an interrupt handler, plus enabling the ICU^WPIC, plus changing the normal code to not un-enable the PIC. npx.c still does something like this in RELENG_4.) However, you may only need to test for pending interrupts. This can be done for isa interrupts using isa_irq_pending() to get a bitmap of pending irqs. See sio.c. On i386's there are also some newer harder to use even less portable interfaces for determining pending irqs. See i386/include/intr_machdep.h. Bruce
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