mirror of https://gitee.com/openkylin/qemu.git
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/*
|
|
* QEMU Macintosh Nubus
|
|
*
|
|
* Copyright (c) 2013-2018 Laurent Vivier <laurent@vivier.eu>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "hw/nubus/nubus.h"
|
|
#include "hw/sysbus.h"
|
|
#include "qapi/error.h"
|
|
|
|
|
|
static NubusBus *nubus_find(void)
|
|
{
|
|
/* Returns NULL unless there is exactly one nubus device */
|
|
return NUBUS_BUS(object_resolve_path_type("", TYPE_NUBUS_BUS, NULL));
|
|
}
|
|
|
|
static void nubus_slot_write(void *opaque, hwaddr addr, uint64_t val,
|
|
unsigned int size)
|
|
{
|
|
/* read only */
|
|
}
|
|
|
|
|
|
static uint64_t nubus_slot_read(void *opaque, hwaddr addr,
|
|
unsigned int size)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const MemoryRegionOps nubus_slot_ops = {
|
|
.read = nubus_slot_read,
|
|
.write = nubus_slot_write,
|
|
.endianness = DEVICE_BIG_ENDIAN,
|
|
.valid = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 1,
|
|
},
|
|
};
|
|
|
|
static void nubus_super_slot_write(void *opaque, hwaddr addr, uint64_t val,
|
|
unsigned int size)
|
|
{
|
|
/* read only */
|
|
}
|
|
|
|
static uint64_t nubus_super_slot_read(void *opaque, hwaddr addr,
|
|
unsigned int size)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const MemoryRegionOps nubus_super_slot_ops = {
|
|
.read = nubus_super_slot_read,
|
|
.write = nubus_super_slot_write,
|
|
.endianness = DEVICE_BIG_ENDIAN,
|
|
.valid = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 1,
|
|
},
|
|
};
|
|
|
|
static void nubus_realize(BusState *bus, Error **errp)
|
|
{
|
|
if (!nubus_find()) {
|
|
error_setg(errp, "at most one %s device is permitted", TYPE_NUBUS_BUS);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void nubus_init(Object *obj)
|
|
{
|
|
NubusBus *nubus = NUBUS_BUS(obj);
|
|
|
|
memory_region_init_io(&nubus->super_slot_io, obj, &nubus_super_slot_ops,
|
|
nubus, "nubus-super-slots",
|
|
NUBUS_SUPER_SLOT_NB * NUBUS_SUPER_SLOT_SIZE);
|
|
|
|
memory_region_init_io(&nubus->slot_io, obj, &nubus_slot_ops,
|
|
nubus, "nubus-slots",
|
|
NUBUS_SLOT_NB * NUBUS_SLOT_SIZE);
|
|
|
|
nubus->current_slot = NUBUS_FIRST_SLOT;
|
|
}
|
|
|
|
static void nubus_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
BusClass *bc = BUS_CLASS(oc);
|
|
|
|
bc->realize = nubus_realize;
|
|
}
|
|
|
|
static const TypeInfo nubus_bus_info = {
|
|
.name = TYPE_NUBUS_BUS,
|
|
.parent = TYPE_BUS,
|
|
.instance_size = sizeof(NubusBus),
|
|
.instance_init = nubus_init,
|
|
.class_init = nubus_class_init,
|
|
};
|
|
|
|
static void nubus_register_types(void)
|
|
{
|
|
type_register_static(&nubus_bus_info);
|
|
}
|
|
|
|
type_init(nubus_register_types)
|