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Message-ID: <20110408220321.GA777@beardog.cce.hp.com> Date: Fri, 8 Apr 2011 17:03:21 -0500 From: brace@...rdog.cce.hp.com To: linux-kernel@...r.kernel.org Cc: brace@...rdog.cce.hp.com, scameron@...rdog.cce.hp.com Subject: How to create a kernel virtual mapping for physical addresses. Given a physical address and a length (which may span contiguous pages), how does one go about creating a virtual mapping for that address? That address may be in high memory (above 4GB) in a 32bit system. ioremap() wants a 32bit physical address on 32bit systems. kmap() and kmap_atomic() wants a struct page which I am not sure how to get from a physical address. If there already is a kernel mapping, then using the existing kernel mapping would be fine if I could figure out how to get it, but if there is not one, then I need to make one. I think setting the DMA mask to 32bit would mean that I do not have to deal with highmem addresses in my particular case, but I still do not know how to get a virtual address from a physical. Any suggestions? Don -- 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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