The DBDMA engine really is running all the time, waiting for input. However
we don't want to waste cycles constantly polling.
So introduce a kick function that data providers can call to notify the
DBDMA controller of new input.
Signed-off-by: Alexander Graf <agraf@suse.de>
We usually keep struct and constant definitions in header files. Move
them there to stay consistent and to make access to fields easier.
Signed-off-by: Alexander Graf <agraf@suse.de>
The DBDMA controller can not change its command stream while it's
actively streaming data, true. But the fact that it's in RUN state
doesn't actually indicate anything. It could just as well be in
WAIT while in RUN. And then it's legal to change commands.
This fixes a real world issue I've encountered with Mac OS X.
Signed-off-by: Alexander Graf <agraf@suse.de>
There was a debug print that didn't compile for me because the format
and the arguments weren't in sync. Fix it up.
Signed-off-by: Alexander Graf <agraf@suse.de>
The macio code is basically undebuggable as it stands today, with no
debug prints anywhere whatsoever. DBDMA was better, but I needed a
few more to create reasonable logs that tell me where breakage is.
Add a DPRINTF macro in the macio source file and add a bunch of debug
prints that are all disabled by default of course.
Signed-off-by: Alexander Graf <agraf@suse.de>
On a real G3 Beige the secondary IDE bus lives on the mac-io chip, not
on some random PCI device. Move it there to become more compatible.
While at it, also clean up the IDE channel connection logic.
Signed-off-by: Alexander Graf <agraf@suse.de>
Mac OS X's debugging serial driver accesses the ESCC through a different
register layout, called "escc-legacy". This layout differs from the normal
escc register layout purely by the location of the respective registers.
This patch adds a memory alias region that takes normal escc registers and
maps them into the escc-legacy register space.
With this patch applied, a Mac OS X guest successfully emits debug output
on the serial port when run with debug parameters set, for example by running:
$ qemu-system-ppc -prom-env -'boot-args=-v debug=0x8 io=0xff serial=0x3' \
-cdrom 10.4.iso -boot d
Signed-off-by: Alexander Graf <agraf@suse.de>
cpu_physical_memory_read, cpu_physical_memory_write take any pointer
as 2nd argument without needing a type cast.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
