Date: Sat, 21 Aug 1999 12:02:23 +0200 (CEST) From: Nick Hibma <n_hibma@skylink.it> To: FreeBSD Hackers mailing list <hackers@freebsd.org> Subject: DMA-able memory Message-ID: <Pine.BSF.4.10.9908211154190.7595-100000@heidi.plazza.it>
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How do I allocate DMA-able memory? Or is all memory DMA-able? Like so: #include <machine/pmap.h> dma_addr = vtophys(addr); The UHCI (and OHCI) USB controllers use DMA to access the queues with the TransferDescriptors and QueueHeads. This is going to be loads of small (4 to 32 byte) memory blocks. Nick -- e-Mail: hibma@skylink.it To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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