Date: Tue, 5 May 1998 13:19:14 +0200 From: Eivind Eklund <eivind@yes.no> To: Terry Lambert <tlambert@primenet.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: ISA PnP / snd PnP developments? Message-ID: <19980505131914.35167@follo.net> In-Reply-To: <199805050739.AAA16950@usr02.primenet.com>; from Terry Lambert on Tue, May 05, 1998 at 07:39:23AM %2B0000 References: <199805032004.NAA01429@rah.star-gate.com> <199805050739.AAA16950@usr02.primenet.com>
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On Tue, May 05, 1998 at 07:39:23AM +0000, Terry Lambert wrote: > > We don't use bios calls for drivers however very recently someone checked in > > code to make bios calls which can come in handy for video adapters video > > modes. > > Making INT 10 calls is generally a bad idea. > > It requires taking down most of the outstanding operations manually > from the kernel side, in the expectation of CLI/STI/etc.. > > This is because it is common practice for video cards with DRAM, > and some with "VRAM" (dual ported RAM) that have inherited BIOS > code from a DRAM card, to disable all interrupts while doing any > INT 10 processing. So far, the plans are only to use the INT 10 calls to switch back the resultion when a panic() occur, to let an X user see the panic message. At that point, I hardly think disabling the interrupts matter :-) Eivind. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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