> On Mon, Jan 11, 1999 at 12:18:57PM -0800, Terence Murphy wrote:
>
> > The linux kernel is full of calls to virt_to_phys. This function
> > seems only to work in kernel mode. Is there a way to convert a
> > physical address to a virtual address in user mode (from a regular
> > program)?
>
> No -- I don't think there presently is.
>
> I think Richard Gooch posted a patch so that this could be done ages
> ago (via ioctl or something).
Any idea on where I can find it? This sounds like it would be very
useful.
> Userland doesn't (or shouldn't) need to know physical addresses
> normally -- can you explain why you might need this?
Mainly because I want to set up cache types for different memory objects
in memory. I want a certain region to be WB, some to be WC, some to be
USWC, etc. To set the cache types (with MTRR's), I need the physical
address. (Note: this is for a highly specialized testing tool, not a
regular application).
-- Terry
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