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