From: Brian Gerst <bgerst@didntduck.org>
To: "Tomar, Nagendra" <nagendra_tomar@adaptec.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: How does ioremap() get non-cached mappings
Date: Fri, 16 Apr 2004 01:32:40 -0400 [thread overview]
Message-ID: <407F6FF8.1020904@quark.didntduck.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0404161037130.17679-100000@localhost.localdomain>
Nagendra Singh Tomar wrote:
> ioremap() function in x86 arch code does not seem to be setting _PAGE_PCD
> bit in the PTE. How then does it give non-cached mapping to MMIO mappings
> for memory on some interface card. I have gone thru some old threads on
> this, which have concluded that it does give non-cached mappings, and
> moerover ioremap seems to work fine whenever I have used to map any PCI
> card memory,
> Is it guaranteed thru the means of MTRR ?
>
ioremap_nocache()
--
Brian Gerst
next prev parent reply other threads:[~2004-04-16 5:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-16 5:11 Nagendra Singh Tomar
2004-04-16 5:32 ` Brian Gerst [this message]
2004-04-16 5:44 ` Nagendra Singh Tomar
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