1 /* 2 * QEMU Empty Slot 3 * 4 * The empty_slot device emulates known to a bus but not connected devices. 5 * 6 * Copyright (c) 2010 Artyom Tarasenko 7 * 8 * This code is licensed under the GNU GPL v2 or (at your option) any later 9 * version. 10 */ 11 12 #include "qemu/osdep.h" 13 #include "hw/sysbus.h" 14 #include "hw/qdev-properties.h" 15 #include "hw/misc/empty_slot.h" 16 #include "qapi/error.h" 17 #include "trace.h" 18 #include "qom/object.h" 19 20 #define TYPE_EMPTY_SLOT "empty_slot" 21 OBJECT_DECLARE_SIMPLE_TYPE(EmptySlot, EMPTY_SLOT) 22 23 struct EmptySlot { 24 SysBusDevice parent_obj; 25 26 MemoryRegion iomem; 27 char *name; 28 uint64_t size; 29 }; 30 31 static uint64_t empty_slot_read(void *opaque, hwaddr addr, 32 unsigned size) 33 { 34 EmptySlot *s = EMPTY_SLOT(opaque); 35 36 trace_empty_slot_write(addr, size << 1, 0, size, s->name); 37 38 return 0; 39 } 40 41 static void empty_slot_write(void *opaque, hwaddr addr, 42 uint64_t val, unsigned size) 43 { 44 EmptySlot *s = EMPTY_SLOT(opaque); 45 46 trace_empty_slot_write(addr, size << 1, val, size, s->name); 47 } 48 49 static const MemoryRegionOps empty_slot_ops = { 50 .read = empty_slot_read, 51 .write = empty_slot_write, 52 .endianness = DEVICE_NATIVE_ENDIAN, 53 }; 54 55 void empty_slot_init(const char *name, hwaddr addr, uint64_t slot_size) 56 { 57 if (slot_size > 0) { 58 /* Only empty slots larger than 0 byte need handling. */ 59 DeviceState *dev; 60 61 dev = qdev_new(TYPE_EMPTY_SLOT); 62 63 qdev_prop_set_uint64(dev, "size", slot_size); 64 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); 65 66 sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, addr, -10000); 67 } 68 } 69 70 static void empty_slot_realize(DeviceState *dev, Error **errp) 71 { 72 EmptySlot *s = EMPTY_SLOT(dev); 73 74 if (s->name == NULL) { 75 s->name = g_strdup("empty-slot"); 76 } 77 memory_region_init_io(&s->iomem, OBJECT(s), &empty_slot_ops, s, 78 s->name, s->size); 79 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); 80 } 81 82 static Property empty_slot_properties[] = { 83 DEFINE_PROP_UINT64("size", EmptySlot, size, 0), 84 DEFINE_PROP_STRING("name", EmptySlot, name), 85 DEFINE_PROP_END_OF_LIST(), 86 }; 87 88 static void empty_slot_class_init(ObjectClass *klass, void *data) 89 { 90 DeviceClass *dc = DEVICE_CLASS(klass); 91 92 dc->realize = empty_slot_realize; 93 device_class_set_props(dc, empty_slot_properties); 94 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 95 } 96 97 static const TypeInfo empty_slot_info = { 98 .name = TYPE_EMPTY_SLOT, 99 .parent = TYPE_SYS_BUS_DEVICE, 100 .instance_size = sizeof(EmptySlot), 101 .class_init = empty_slot_class_init, 102 }; 103 104 static void empty_slot_register_types(void) 105 { 106 type_register_static(&empty_slot_info); 107 } 108 109 type_init(empty_slot_register_types) 110