Date: Fri, 7 Dec 2001 00:32:02 -0600 From: Alfred Perlstein <bright@mu.org> To: David Xu <davidx@viasoft.com.cn> Cc: Nicolas Souchu <nsouch@fr.alcove.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: kld VM pager Message-ID: <20011207003202.K92148@elvis.mu.org> In-Reply-To: <3C105A26.9090005@viasoft.com.cn>; from davidx@viasoft.com.cn on Fri, Dec 07, 2001 at 01:56:54PM %2B0800 References: <20011206143022.H13566@cedar.alcove-fr> <3C10410E.9040805@viasoft.com.cn> <20011206231758.J92148@elvis.mu.org> <3C105A26.9090005@viasoft.com.cn>
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* David Xu <davidx@viasoft.com.cn> [011207 00:01] wrote:
> you mean we can use OBJT_PHYS? do we fully support it?
> althougth we have phys_pager, I suspect it is not enough, because
> along with fault handling, graphics driver will need other operations, for
> examples, unmap other pages and setup hardware registers,
> think about a frame buffer driver need to map 32K window into 1024K
> address space, when fault ocurrs in second 32K window, it should unmap
> first 32K address and activate second 32K address and setup graphics card
> registers to let later access to its internal second 32K memory bank.
> how can you handle such issue after vm_fault?
By setting the proper page protections.
--
-Alfred Perlstein [alfred@freebsd.org]
'Instead of asking why a piece of software is using "1970s technology,"
start asking why software is ignoring 30 years of accumulated wisdom.'
http://www.morons.org/rants/gpl-harmful.php3
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