On 21 May 2012 19:08, Blue Swirl <blauwir...@gmail.com> wrote: > On Mon, May 21, 2012 at 10:36 AM, Peter Maydell > <peter.mayd...@linaro.org> wrote: >> I think it would be nice to have this in upstream qemu; however adding >> transaction properties to the IO interface would be quite tricky I >> suspect... > > This is limited to CPU and CPU local bus devices (not generic like > PCI), so there could be an out of band mechanism to get/set the > additional data.
What's your definition of "generic" here? AMBA isn't particularly limited to CPU local bus devices either, really (for instance the connection between a versatile express CPU daughterboard and the motherboard includes an AMBA AXI bus). > For example store in op_helper.c could use > cpu_set_amba_properties(...) before the store and afterwards > cpu_get_amba_reply(...). We really don't want to do two helper function calls for every load or store! If you're going to implement them at all then you need a more efficient implementation than that... -- PMM
