On 06/04/2008, Anthony Liguori <[EMAIL PROTECTED]> wrote: > Blue Swirl wrote: > > To support Sparc IOMMU and DMA controller > > I need a way to call a series of different translation functions > > depending on the bus where we are. For the byte swapping case the > > memcpy functions must be dynamic as well. > > Does DMA really byte-swap? I know PCI controllers byte swap within the > configuration space but I didn't think they byte-swapped DMA transfers. I'm > not even sure how that would work.
As a note, the DMA controllers in the ARM system-on-chip's can byte-swap, do 90deg rotation of 2D arrays, transparency (probably intened for image blitting, but still available on any kind of transfers), etc., and most importantly issue interrupts on reaching different points of a transfer. It is not worth worrying about them in this API. I have been for some time wanting to make a separate api called soc_dma whose task would be using simply memcpy (or zero-copy) in the most basic case (interrupts off, no transparency, same-endianness endpoints), as these properties are common for DMA on the TI OMAPs, the Intel PXAs and the Samsung S3Cs (which otherwise have little in common). Cheers -- Please do not print this email unless absolutely necessary. Spread environmental awareness. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
