mac-io: Add escc-legacy memory alias region

Enterprise / Virtualization / QEMU - Alexander Graf [suse.de] - 30 June 2013 18:11 UTC

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

0d54a50 mac-io: Add escc-legacy memory alias region
hw/misc/macio/macio.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)

Upstream: git.qemu.org

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