hw/sysbus: Add sysbus_mmio_get_region()

Add a sysbus_mmio_get_region() which allows users of sysbus
devices to turn a (SysBusDevice*, mmioidx) tuple into a
MemoryRegion*. This enables some useful simplifications of
devices which pass through another device's mmio region
(either directly or by implementing some kind of memory
controller device).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/hw/sysbus.h b/hw/sysbus.h
index b87c6c5aab..aa3d383277 100644
--- a/hw/sysbus.h
+++ b/hw/sysbus.h
@@ -50,6 +50,7 @@ void sysbus_init_mmio(SysBusDevice *dev, target_phys_addr_t size,
 void sysbus_init_mmio_cb2(SysBusDevice *dev,
                           mmio_mapfunc cb, mmio_mapfunc unmap);
 void sysbus_init_mmio_region(SysBusDevice *dev, MemoryRegion *memory);
+MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n);
 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p);
 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target);
 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size);