Probing for (non-existing) memory?

[Michael Schmitz]

On Thu, 21 Oct 1999, Wolfgang Denk wrote:

> please excuse the silly question: is there a standard way to probe an
> address if it is readable/writable memory? Ideally something that  is
> portable across all architectures?

Look at what copy_to_user or copy_from_user does to set up a temporary
page fault handler, so to speak. m68k has hwreg_present() so I'd start by
translating that to ppc assembly. 

	Michael


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