Date: Mon, 2 Jun 1997 05:53:16 +1000 From: Bruce Evans <bde@zeta.org.au> To: ache@nagual.pp.ru, bde@zeta.org.au Cc: current@FreeBSD.ORG, se@FreeBSD.ORG Subject: Re: Shared irq's broke sounddriver badly Message-ID: <199706011953.FAA32060@godzilla.zeta.org.au>
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>> >opl0 at 0x388-0x38b irq 31 on isa
>> > ^^^^^^
>>
>> What was it originally?
>
>There is no IRQ for this device at all (according to config line).
This is another old, previously unreported, bug. soundcard.c corrupts
no-IRQ to irq 31 via the following operations:
hw_config.irq = ipri_to_irq(dev->id_irq); /* in sndprobe() */
dev->id_irq = (1 << hw_config.irq); /* in sndattach() */
ipri_to_irq(0) = (unsigned short)-1 = 0xffff (assuming 16-bit unsigned shorts).
1 << 0xffff = 1 < (0xfffff) & 0x1f) = 1 << 31 (assuming a 386).
Bruce
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