Date: Tue, 31 Dec 2002 10:22:52 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: Perforce Change Reviews <perforce@FreeBSD.org> Subject: Re: PERFORCE change 22825 for review Message-ID: <XFMail.20021231102252.jhb@FreeBSD.org> In-Reply-To: <20021230201350.GA696@dhcp01.pn.xcllnt.net>
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On 30-Dec-2002 Marcel Moolenaar wrote: > On Mon, Dec 30, 2002 at 02:41:58PM -0500, John Baldwin wrote: >> >> > DANGER, WILL ROBINSON: this change hardcodes the trigger >> > mode and polarity for 3 interrupt vectors to be edge >> > sensitive active high. Do not use this code unless you >> > know it cannot harm. The kludge committed to get a serial >> > console on the HP box in the cluster until we have figured >> > where and how we can get information about interrupts and >> > specificly about trigger mode and polarity. >> >> How about reading the default value of the vector in the IO APIC >> vector entry? Or better yet, leave the polarity and trigger mode >> of those entries alone and only ever change the vector. > > Hmmm... Not a bad idea. But a bit scary. If the default settings are > level sensitive active low, then I'm willing to give it a shot. > > Another idea I'm playing with is to look at the bus on which the device > is attached. PCI is (AFAICT) always level sensitive active low. No need > to guess if the device is attached to a PCI bus. The hardcoding I did > is typically for devices attached to the ACPI bus. If ACPI defaults to > edge sensitive active high (= compatible with ISA), then this should > work. ACPI isn't a bus. However, you can probably (XXX) assume that if there is an ACPI device that isn't hung off of PCI, it's like an ISA device and thus use ISA-type properties. Ugly isn't it. :( >> However, try looking at the madt. Check out the diffs in jhb_madt >> to print out the contents of the MADT. The MADT can describe when >> certain pins are not normal. > > You mean the redirection/override entries? We don't have those. I > haven't found anything in the MADT that tells us what the polarity > and trigger mode should be. > > The override entries only apply to PIC IRQs 0-15 and this box does > not have any PICs. It does not support non-APIC interrupt schemes. > Hence, no need for overrides. > > Apparently everything is perceived to be normal from ACPI's point of > view, so there's nothing there... > > -- > Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe p4-projects" in the body of the message
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