diff options
Diffstat (limited to 'hw/nubus/nubus-bus.c')
| -rw-r--r-- | hw/nubus/nubus-bus.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/hw/nubus/nubus-bus.c b/hw/nubus/nubus-bus.c index 3cd7534..96ef027 100644 --- a/hw/nubus/nubus-bus.c +++ b/hw/nubus/nubus-bus.c @@ -96,11 +96,40 @@ static void nubus_init(Object *obj) NUBUS_SLOT_NB); } +static bool nubus_check_address(BusState *bus, DeviceState *dev, Error **errp) +{ + NubusDevice *nd = NUBUS_DEVICE(dev); + NubusBus *nubus = NUBUS_BUS(bus); + + if (nd->slot == -1) { + /* No slot specified, find first available free slot */ + int s = ctz32(nubus->slot_available_mask); + if (s != 32) { + nd->slot = s; + } else { + error_setg(errp, "Cannot register nubus card, no free slot " + "available"); + return false; + } + } else { + /* Slot specified, make sure the slot is available */ + if (!(nubus->slot_available_mask & BIT(nd->slot))) { + error_setg(errp, "Cannot register nubus card, slot %d is " + "unavailable or already occupied", nd->slot); + return false; + } + } + + nubus->slot_available_mask &= ~BIT(nd->slot); + return true; +} + static void nubus_class_init(ObjectClass *oc, void *data) { BusClass *bc = BUS_CLASS(oc); bc->realize = nubus_realize; + bc->check_address = nubus_check_address; } static const TypeInfo nubus_bus_info = { |