On 03/13/2015 01:46 PM, Russell King - ARM Linux wrote: > On Fri, Mar 13, 2015 at 01:41:02PM -0400, Peter Hurley wrote: >> I think this would be much cleaner keeping the existing register index >> symbolic constants and using a remapping LUT with inline i/o accessors. >> >> Plus it has the advantage of disallowing certain indexes which are not >> mapped (rather than an accidental alias). >> >> I realize that was not the original model set forth but I don't think >> the original model contemplated a complete remap. > > In that case, we will want to ensure that we cache the data register > and flag register iomem pointer in loops, so we don't have to > constantly reload the base and offsets. > > This code gets run on some fairly slow ARM systems - including entirely > FPGA based systems. I would the think the compiler would factor ptr calculations outside any loop, but maybe not. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
