Re: User mode Virt -> Phys

Chris Wedgwood (cw@ix.net.nz)
Tue, 12 Jan 1999 16:33:27 +1300


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).

Userland doesn't (or shouldn't) need to know physical addresses
normally -- can you explain why you might need this?

(I'm not saying you don't, I've tested drivers from userland before,
so its conceivable there are uses for this)

-cw

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