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Date:      Mon, 19 Jun 2000 18:36:14 +0200
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        Warner Losh <imp@village.org>
Cc:        Mitsuru IWASAKI <iwasaki@jp.freebsd.org>, bfischer@Techfak.Uni-Bielefeld.DE, acpi-jp@jp.freebsd.org, dcs@newsguy.com, freebsd-current@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG
Subject:   Re: ACPI project progress report 
Message-ID:  <45525.961432574@critter.freebsd.dk>
In-Reply-To: Your message of "Mon, 19 Jun 2000 10:30:53 MDT." <200006191630.KAA60652@harmony.village.org> 

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In message <200006191630.KAA60652@harmony.village.org>, Warner Losh writes:
>In message <20000620003220R.iwasaki@jp.FreeBSD.org> Mitsuru IWASAKI writes:
>: Maybe I'm wrong because of lack of my understanding on crush dump and
>: loader.  Please help us :-)
>
>I think that you might be able to do this.  The real tricky part maybe
>saving hardware RAM that the drivers expect to be there when you
>wakeup.  I thinking of video ram and the X server's font cache, to
>name one example.

Drivers will need a "your hardware may have been zonked" entrypoint,
think about the i8254 counter or all the weird versions of write
only or "write here - read there" I/O registers in existence.

Obviously the video driver will need to send a signal or clue to the
Xserver saying "you own the device, you'd better do something"

--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD coreteam member | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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