site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Use IOBufferMemoryDescriptor. No, you cannot map arbitrary virtual addresses to physical, even for wired OSMalloc-ed buffers. If you are intending to use a buffer for DMA, use the appropriate APIs for allocating DMA-safe buffers. Shantonu On Aug 6, 2010, at 4:46 AM, Antoine Missout wrote:
grep xnu for ml_vtophys
However, it is not exported.
- Antoine
On 2010-08-05, at 2:10 PM, shailesh jain wrote:
Hello again! I have a kernel extension (which is not an IOKit driver) that uses OSMalloc_ KPI to allocate buffer. I pass in OSMT_DEFAULT so that buffers that it returns are wired to memory. I have a use case where in I would like to get physical address of the first byte of the buffer. I understand that buffer will not be contiguous in Physical memory and I am fine with that. Do we have such an interface ---
something like: physAddr = virt_to_phys(buffer); // Gives physical address of first byte of the buffer
-- Shailesh Jain _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/antoine.missout%40metak...
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