From: Ivan Passos <lists@cyclades.com>
To: Linux Kernel Mailing list <linux-kernel@vger.rutgers.edu>
Cc: Linux MM mailing list <linux-mm@kvack.org>
Subject: Re: phys-to-virt kernel mapping and ioremap()
Date: Thu, 20 Jul 2000 12:12:39 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.10.10007201208210.11710-100000@main.cyclades.com> (raw)
In-Reply-To: <20000720183534Z156966-31297+1096@vger.rutgers.edu>
On Thu, 20 Jul 2000, Timur Tabi wrote:
>
> > Timur> 1) Doesn't this mapping break the phys_to_virt and virt_to_phys
> > Timur> macros?
> >
> > Those two macros are not defined on ioremap'ed regions so it is
> > irrelevant.
>
> In that case, how do I do virt-to-phys and phys-to-virt translations on the
> memory addresses for ioremap'ed regions?
Why would you wanna do that for a PCI MMIO region??
1) ioremap(PCI_addr) returns a virtual address.
2) Use read[bwl], write[bwl], memcpy_toio, memcpy_fromio, memset_io ...
with the obtained virtual address to access the MMIO region.
What else do you need?? Please let us know.
Regards,
Ivan
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next prev parent reply other threads:[~2000-07-20 19:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20000720174852Z156962-31297+1037@vger.rutgers.edu>
2000-07-20 18:41 ` Jes Sorensen
2000-07-20 18:53 ` Timur Tabi
[not found] ` <20000720183534Z156966-31297+1096@vger.rutgers.edu>
2000-07-20 19:06 ` Jes Sorensen
2000-07-20 19:12 ` Ivan Passos [this message]
2000-07-20 18:06 Timur Tabi
2000-07-21 13:49 ` Jeff Garzik
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