I was just reading up on mmap in Solaris drivers, and I'm afraid I may have a problem...:
I need to allocate and map into userspace a bunch of 128KB buffers. The buffers need to be physically contiguous in DMA space, and virtually contiguous in userspace. This has to run on amd64, so I can't use an IOMMU to make discontiguous 4KB pages contiguous. According to devmap_umemem_setup(9f), I'm supposed to use devmap_umem_setup() for kernel memory, and I need to pass a ddi_umem_cookie_t. The ddi_umem_cookie_t means (I think) that I must allocate the memory via ddi_umem_alloc(), and I don't think that will allocate anything larger than a single page physically contiguous. Is there any way I can use ddi_dma_alloc_mem_alloc() (or something else) to get 128KB physically contiguous and map that out? Or.... Is it still acceptable to supply a cb_mmap() and use the nice, simple, straightforward old way of returning a page frame number? Thanks, Drew _______________________________________________ driver-discuss mailing list driver-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/driver-discuss
