1 /* 2 * QEMU Macintosh Nubus 3 * 4 * Copyright (c) 2013-2018 Laurent Vivier <laurent@vivier.eu> 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 * 9 */ 10 11 #include "qemu/osdep.h" 12 #include "hw/nubus/nubus.h" 13 #include "hw/sysbus.h" 14 #include "qapi/error.h" 15 16 17 static NubusBus *nubus_find(void) 18 { 19 /* Returns NULL unless there is exactly one nubus device */ 20 return NUBUS_BUS(object_resolve_path_type("", TYPE_NUBUS_BUS, NULL)); 21 } 22 23 static void nubus_slot_write(void *opaque, hwaddr addr, uint64_t val, 24 unsigned int size) 25 { 26 /* read only */ 27 } 28 29 30 static uint64_t nubus_slot_read(void *opaque, hwaddr addr, 31 unsigned int size) 32 { 33 return 0; 34 } 35 36 static const MemoryRegionOps nubus_slot_ops = { 37 .read = nubus_slot_read, 38 .write = nubus_slot_write, 39 .endianness = DEVICE_BIG_ENDIAN, 40 .valid = { 41 .min_access_size = 1, 42 .max_access_size = 1, 43 }, 44 }; 45 46 static void nubus_super_slot_write(void *opaque, hwaddr addr, uint64_t val, 47 unsigned int size) 48 { 49 /* read only */ 50 } 51 52 static uint64_t nubus_super_slot_read(void *opaque, hwaddr addr, 53 unsigned int size) 54 { 55 return 0; 56 } 57 58 static const MemoryRegionOps nubus_super_slot_ops = { 59 .read = nubus_super_slot_read, 60 .write = nubus_super_slot_write, 61 .endianness = DEVICE_BIG_ENDIAN, 62 .valid = { 63 .min_access_size = 1, 64 .max_access_size = 1, 65 }, 66 }; 67 68 static void nubus_realize(BusState *bus, Error **errp) 69 { 70 if (!nubus_find()) { 71 error_setg(errp, "at most one %s device is permitted", TYPE_NUBUS_BUS); 72 return; 73 } 74 } 75 76 static void nubus_init(Object *obj) 77 { 78 NubusBus *nubus = NUBUS_BUS(obj); 79 80 memory_region_init_io(&nubus->super_slot_io, obj, &nubus_super_slot_ops, 81 nubus, "nubus-super-slots", 82 NUBUS_SUPER_SLOT_NB * NUBUS_SUPER_SLOT_SIZE); 83 84 memory_region_init_io(&nubus->slot_io, obj, &nubus_slot_ops, 85 nubus, "nubus-slots", 86 NUBUS_SLOT_NB * NUBUS_SLOT_SIZE); 87 88 nubus->current_slot = NUBUS_FIRST_SLOT; 89 } 90 91 static void nubus_class_init(ObjectClass *oc, void *data) 92 { 93 BusClass *bc = BUS_CLASS(oc); 94 95 bc->realize = nubus_realize; 96 } 97 98 static const TypeInfo nubus_bus_info = { 99 .name = TYPE_NUBUS_BUS, 100 .parent = TYPE_BUS, 101 .instance_size = sizeof(NubusBus), 102 .instance_init = nubus_init, 103 .class_init = nubus_class_init, 104 }; 105 106 static void nubus_register_types(void) 107 { 108 type_register_static(&nubus_bus_info); 109 } 110 111 type_init(nubus_register_types) 112