On 19.06.2012, at 08:21, Benjamin Herrenschmidt wrote: > This adds a qemu-specific hypervisor call to the pseries machine > which allows to do what amounts to memmove, memcpy and xor over > regions of physical memory such as the framebuffer. > > This is the simplest way to get usable framebuffer speed from > SLOF since the framebuffer isn't mapped in the VRMA and so would > otherwise require an hcall per 8 bytes access. > > The performance is still not great but usable, and can be improved > with a more complex implementation of the hcall itself if needed. > > This also adds some documentation for the qemu-specific hypercalls > that we add to PAPR along with a new qemu,hypertas-functions property > that mirrors ibm,hypertas-functions and provides some discoverability > for the new calls. > > Note: I chose note to advertise H_RTAS to the guest via that mechanism. > This is done on purpose, the guest uses the normal RTAS interfaces > provided by qemu (including SLOF) which internally calls H_RTAS. > > We might in the future implement part (or even all) of RTAS inside the > guest like IBM's firmware does and replace H_RTAS with some finer grained > set of private hypercalls. > > Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Thanks, applied to ppc-next. Alex
