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Date: Wed, 11 Jul 2007 12:00:50 +0200 From: Clemens Koller <clemens.koller@...gramm.de> To: Manu Abraham <abraham.manu@...il.com> CC: Nobin Mathew <nobin.mathew@...il.com>, "vraghavan3@...l.gatech.edu" <vraghavan3@...l.gatech.edu>, linux-kernel@...r.kernel.org Subject: Re: Reading a physical memory location Manu Abraham schrieb: > On 7/11/07, Nobin Mathew <nobin.mathew@...il.com> wrote: >> See this in the documentation >> >> The returned virtual address is a current CPU mapping for the memory >> address given. It is only valid to use this function on addresses that >> have a kernel mapping >> >> This function does not handle bus mappings for DMA transfers. In >> almost all conceivable cases a device driver should not be using this >> function >> > > To get a better idea, look here > http://tldp.org/LDP/khg/HyperNews/get/devices/addrxlate.html Very nice! I have two more questions: 1. Is the document up to date? 2. Can anybody give an example how to "map" lots of pages (which got filled by i.e. a scatter gather DMA chain) from a driver (kernel space) to userspace? Thanks -- Clemens Koller __________________________________ R&D Imaging Devices Anagramm GmbH Rupert-Mayer-Straße 45/1 Linhof Werksgelände D-81379 München Tel.089-741518-50 Fax 089-741518-19 http://www.anagramm-technology.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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