• Magnus Damm's avatar
    sh: trapped io support V2 · e7cc9a73
    Magnus Damm authored
    The idea is that we want to get rid of the in/out/readb/writeb callbacks from
    the machvec and replace that with simple inline read and write operations to
    memory. Fast and simple for most hardware devices (think pci).
    
    Some devices require special treatment though - like 16-bit only CF devices -
    so we need to have some method to hook in callbacks.
    
    This patch makes it possible to add a per-device trap generating filter. This
    way we can get maximum performance of sane hardware - which doesn't need this
    filter - and crappy hardware works but gets punished by a performance hit.
    
    V2 changes things around a bit and replaces io access callbacks with a
    simple minimum_bus_width value. In the future we can add stride as well.
    Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
    Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
    e7cc9a73
io_trapped.c 5.83 KB