Date: Mon, 12 Dec 2011 09:52:52 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Alexander Yerenkow <yerenkow@gmail.com> Cc: arch@FreeBSD.org, FreeBSD current <freebsd-current@FreeBSD.org> Subject: Re: grabbing console (syscons) in kernel Message-ID: <4EE5B2D4.9050705@FreeBSD.org> In-Reply-To: <CAPJF9wkyCz1PVZoUA0xPTHTq%2BELZiQXsbgbh4AL3V8utjExFfg@mail.gmail.com> References: <4EE52469.3050201@FreeBSD.org> <CAPJF9wkyCz1PVZoUA0xPTHTq%2BELZiQXsbgbh4AL3V8utjExFfg@mail.gmail.com>
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on 12/12/2011 00:06 Alexander Yerenkow said the following: > > > 2011/12/11 Andriy Gapon <avg@freebsd.org <mailto:avg@freebsd.org>> > > > There are a few cases when the kernel needs to interact with a user via syscons. > This is the cases where the kernel not only spews some output but also expects > some input. Some examples are: > - asking for a root filesystem specification > - entering ddb > - asking to press a key for reboot > > In this cases the kernel implicitly grabs the console for its own use. > I'd like to make action more explicit. > > What do you think about the approach and implementation in the following > patches? > Thank you! > > https://gitorious.org/~avg/freebsd/avgbsd/commit/5248b49ebf84d98a0597fa5aa4d813a38f581acc > https://gitorious.org/~avg/freebsd/avgbsd/commit/a0849c52242378474bb2eaa41726376fbc4c5bf6 > https://gitorious.org/~avg/freebsd/avgbsd/commit/a67515cbd720b16f03ba435ed182966a8a338b15 > https://gitorious.org/~avg/freebsd/avgbsd/commit/b8864b68b4c0e26ece065a38301c305833be32eb > https://gitorious.org/~avg/freebsd/avgbsd/commit/1017ae425d8abecd7482bd6c6deaaf9f25f5c6cd > > P.S. one of the benefits is that a keyboard is put into and out of the polling > mode before getting all the required input and after that; not around each > character as it is done now in rather twisted way. > > > Does asking for geli password is such case too? Yes. > For example, I have mouse, which can disappear/reappear while laying still; and > when geli asks password, ums0 connect message can appear, which moves line > "Please enter geli password..." to top, and it can be missed; > This behavior somehow change? No. The patches do not contain user-visible changes. They make things easier for keyboard drivers and hopefully provide a more logical interface to kernel. Their primary target is the input path, they do not introduce any changes to the output path. -- Andriy Gapon
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