nubus: move nubus to its own 32-bit address space
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>
diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c
index 5ba87f7..a07912b 100644
--- a/hw/m68k/q800.c
+++ b/hw/m68k/q800.c
@@ -67,9 +67,6 @@
#define ASC_BASE (IO_BASE + 0x14000)
#define SWIM_BASE (IO_BASE + 0x1E000)
-#define NUBUS_SUPER_SLOT_BASE 0x60000000
-#define NUBUS_SLOT_BASE 0xf0000000
-
#define SONIC_PROM_SIZE 0x1000
/*
@@ -396,8 +393,10 @@
dev = qdev_new(TYPE_MAC_NUBUS_BRIDGE);
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
- sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, NUBUS_SUPER_SLOT_BASE);
- sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1, NUBUS_SLOT_BASE);
+ sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0,
+ MAC_NUBUS_FIRST_SLOT * NUBUS_SUPER_SLOT_SIZE);
+ sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1, NUBUS_SLOT_BASE +
+ MAC_NUBUS_FIRST_SLOT * NUBUS_SLOT_SIZE);
nubus = MAC_NUBUS_BRIDGE(dev)->bus;
diff --git a/hw/nubus/mac-nubus-bridge.c b/hw/nubus/mac-nubus-bridge.c
index 3f07578..3af4f5d 100644
--- a/hw/nubus/mac-nubus-bridge.c
+++ b/hw/nubus/mac-nubus-bridge.c
@@ -22,8 +22,20 @@
s->bus->slot_available_mask = MAKE_64BIT_MASK(MAC_NUBUS_FIRST_SLOT,
MAC_NUBUS_SLOT_NB);
- sysbus_init_mmio(sbd, &s->bus->super_slot_io);
- sysbus_init_mmio(sbd, &s->bus->slot_io);
+ /* Aliases for slots 0x9 to 0xe */
+ memory_region_init_alias(&s->super_slot_alias, obj, "super-slot-alias",
+ &s->bus->nubus_mr,
+ MAC_NUBUS_FIRST_SLOT * NUBUS_SUPER_SLOT_SIZE,
+ MAC_NUBUS_SLOT_NB * NUBUS_SUPER_SLOT_SIZE);
+
+ memory_region_init_alias(&s->slot_alias, obj, "slot-alias",
+ &s->bus->nubus_mr,
+ NUBUS_SLOT_BASE +
+ MAC_NUBUS_FIRST_SLOT * NUBUS_SLOT_SIZE,
+ MAC_NUBUS_SLOT_NB * NUBUS_SLOT_SIZE);
+
+ sysbus_init_mmio(sbd, &s->super_slot_alias);
+ sysbus_init_mmio(sbd, &s->slot_alias);
}
static void mac_nubus_bridge_class_init(ObjectClass *klass, void *data)
diff --git a/hw/nubus/nubus-bus.c b/hw/nubus/nubus-bus.c
index 215fdb6..07c279b 100644
--- a/hw/nubus/nubus-bus.c
+++ b/hw/nubus/nubus-bus.c
@@ -78,25 +78,42 @@
},
};
+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 @@
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;
}
diff --git a/include/hw/nubus/mac-nubus-bridge.h b/include/hw/nubus/mac-nubus-bridge.h
index 118d672..04451d3 100644
--- a/include/hw/nubus/mac-nubus-bridge.h
+++ b/include/hw/nubus/mac-nubus-bridge.h
@@ -23,6 +23,8 @@
SysBusDevice sysbus_dev;
NubusBus *bus;
+ MemoryRegion super_slot_alias;
+ MemoryRegion slot_alias;
};
#endif
diff --git a/include/hw/nubus/nubus.h b/include/hw/nubus/nubus.h
index 343be95..9f9386a 100644
--- a/include/hw/nubus/nubus.h
+++ b/include/hw/nubus/nubus.h
@@ -17,6 +17,9 @@
#define NUBUS_SUPER_SLOT_SIZE 0x10000000U
#define NUBUS_SUPER_SLOT_NB 0xe
+#define NUBUS_SLOT_BASE (NUBUS_SUPER_SLOT_SIZE * \
+ (NUBUS_SUPER_SLOT_NB + 1))
+
#define NUBUS_SLOT_SIZE 0x01000000
#define NUBUS_FIRST_SLOT 0x0
#define NUBUS_LAST_SLOT 0xf
@@ -33,6 +36,9 @@
struct NubusBus {
BusState qbus;
+ AddressSpace nubus_as;
+ MemoryRegion nubus_mr;
+
MemoryRegion super_slot_io;
MemoryRegion slot_io;
