Date: Thu, 2 Feb 2006 17:21:18 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: freebsd-current@www.freebsd.org Subject: mapping "random" physical memory into kernel Message-ID: <17378.34270.630897.473143@grasshopper.cs.duke.edu>
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Can somebody please remind me what the supported way to establish a kernel virtual address for a "random" chunk of physical memory is? I'm currently using pmap_mapdev() directly, but that just feels dirty... I need to twiddle the settings of an Nvidia NF4 bridge in extended PCI config space (offset 0x178). These offsets are not accessible via normal pci config space writes, but are doable when you use the 0xe000000 mapping. The problem is that this memory is not really associated with anything, so a normal bus_alloc_resource() allocation doesn't seem like it would work. Thanks, Drew
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