Date: Tue, 29 Dec 1998 08:04:51 -0800 From: Mike Smith <mike@smith.net.au> To: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> Cc: Mike Smith <mike@smith.net.au>, current@FreeBSD.ORG Subject: Re: future of syscons Message-ID: <199812291604.IAA00584@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 30 Dec 1998 00:58:06 %2B0900." <199812291558.AAA16643@zodiac.mech.utsunomiya-u.ac.jp>
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> >> It is true that IRQ 1 is always assigned to the keyboard controller on > >> the AT motherboard and no device can claim it because IRQ 1 line is > >> not available in expansion slots. > >> > >> The PS/2 mouse interrupt IRQ 12 is another story. IRQ 12 is available > >> to ISA and PCI bus slots and you can assign it to a device! We > >> shouldn't make the keyboard controller code to claim IRQ 12 when > >> either 1) a PS/2 mouse is not detected, or 2) another device is using > >> or going to use IRQ 12. > > > >Sure; by all means disable the interrupt handler if a ps/2 mouse is not > >found, > > I think that "disabling the interrupt handler" is not enough, the IRQ > 12 resource must be released and made available to other devices to claim. Poor choice of words on my part; indeed, if there is no chance of a mouse being connected, IRQ 12 is free for other uses. In most cases, there will be PnP information available to support this decision. > # The PS/2 mouse port is generally not designed for "hot plugging". > # Thus, in general it is very little use reserving the IRQ 12 if the mouse > # is not detected at boot time; the mouse won't be connected later. Ok; I get the impression that many systems don't support hot-plugged PS/2 mice, so we can probably go with the same. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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