This series introduces a new nubus-virtio-mmio device which can be plugged into the q800 machine to enable a 68k Classic MacOS guest to access virtio devices such as virtio-9p-device (host filesharing), virtio-gpu (extended framebuffer support) and virtio-tablet-device (absolute positioning).
Once the nubus-virtio-mmio device has been plugged into the q800 machine, virtio devices can be accessed by a Classic MacOS guest using the drivers from the classicvirtio project at https://github.com/elliotnunn/classicvirtio. The nubus-virtio-mmio device is purposefully designed to be similar to the virtio-mmio interface used by the existing 68k virt machine, making use of a similar memory layout and the goldfish PIC for simple interrupt management. The main difference is that only a single goldfish PIC is used, however that still allows up to 32 virtio devices to be connected using a single nubus card. Patch 1 fixes an alignment bug in the existing nubus-device Declaration ROM code whereby some ROM images could trigger an assert() in QEMU, patch 2 increases the maximum Declaration ROM size (to aid development), whilst patch 3 adds the nubus-virtio-mmio device itself. Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> [Patches still needing review: 2, 3] v3: - Rebase onto master - Update patch 1 alignment calculation to use intermediatery uint8_t rom_ptr variable, add Phil's R-B tag - Add patch 2 to increase maximum Declaration ROM size to 1MB v2: - Rebase onto master - Adjust comment in patch 1 as suggested by Phil Mark Cave-Ayland (3): nubus-device: round Declaration ROM memory region address to qemu_target_page_size() nubus.h: increase maximum Declaration ROM size from 128k to 1Mb nubus: add nubus-virtio-mmio device hw/nubus/meson.build | 1 + hw/nubus/nubus-device.c | 18 +++-- hw/nubus/nubus-virtio-mmio.c | 102 +++++++++++++++++++++++++++ include/hw/nubus/nubus-virtio-mmio.h | 36 ++++++++++ include/hw/nubus/nubus.h | 2 +- 5 files changed, 154 insertions(+), 5 deletions(-) create mode 100644 hw/nubus/nubus-virtio-mmio.c create mode 100644 include/hw/nubus/nubus-virtio-mmio.h -- 2.39.2
