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nubus: move nubus to its own 32-bit address space

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According to "Designing Cards and Drivers for the Macintosh Family" the Nubus
has its own 32-bit address space based upon physical slot addressing.

Move Nubus to its own 32-bit address space and then use memory region aliases
to map available slot and super slot ranges into the q800 system address
space via the Macintosh Nubus bridge.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210924073808.1041-13-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2021-09-24 08:38:00 +01:00 • committed by Laurent Vivier
parent 3616f424c9
commit 62437f90cf
5 changed files with 44 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

18
hw/nubus/nubus-bus.c
View file

@ -78,25 +78,42 @@ static const MemoryRegionOps nubus_super_slot_ops = {
},
};
static void nubus_unrealize(BusState *bus)
{
NubusBus *nubus = NUBUS_BUS(bus);
address_space_destroy(&nubus->nubus_as);
}
static void nubus_realize(BusState *bus, Error **errp)
{
NubusBus *nubus = NUBUS_BUS(bus);
if (!nubus_find()) {
error_setg(errp, "at most one %s device is permitted", TYPE_NUBUS_BUS);
return;
}
address_space_init(&nubus->nubus_as, &nubus->nubus_mr, "nubus");
}
static void nubus_init(Object *obj)
{
NubusBus *nubus = NUBUS_BUS(obj);
memory_region_init(&nubus->nubus_mr, obj, "nubus", 0x100000000);
memory_region_init_io(&nubus->super_slot_io, obj, &nubus_super_slot_ops,
nubus, "nubus-super-slots",
(NUBUS_SUPER_SLOT_NB + 1) * NUBUS_SUPER_SLOT_SIZE);
memory_region_add_subregion(&nubus->nubus_mr, 0x0, &nubus->super_slot_io);
memory_region_init_io(&nubus->slot_io, obj, &nubus_slot_ops,
nubus, "nubus-slots",
NUBUS_SLOT_NB * NUBUS_SLOT_SIZE);
memory_region_add_subregion(&nubus->nubus_mr,
(NUBUS_SUPER_SLOT_NB + 1) *
NUBUS_SUPER_SLOT_SIZE, &nubus->slot_io);
nubus->slot_available_mask = MAKE_64BIT_MASK(NUBUS_FIRST_SLOT,
NUBUS_SLOT_NB);
@ -150,6 +167,7 @@ static void nubus_class_init(ObjectClass *oc, void *data)
BusClass *bc = BUS_CLASS(oc);
bc->realize = nubus_realize;
bc->unrealize = nubus_unrealize;
bc->check_address = nubus_check_address;
bc->get_dev_path = nubus_get_dev_path;
}