Date: Thu, 5 Jun 1997 05:51:02 +1000 From: Bruce Evans <bde@zeta.org.au> To: freebsd-hackers@FreeBSD.ORG, peb@george.lbl.gov Subject: Re: Virtual address question for VM guru's Message-ID: <199706041951.FAA14842@godzilla.zeta.org.au>
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>I am working on a project where I need to access the address space of a >process when the process is not necessarily the current process. I am >working on a device driver which requires that I copy data directly into >any writable region in the processes address space. The user informs the >kernel of the address range which is then verified and wired before any >such transfers take place. This _almost_ all works, if the process is not >active at the time the device driver attempts to write to the buffer the >virtual address is giberish. The corresponding problem for DMA is handled by physio(). This is mostly transparent to drivers. Bruce
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