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 typedef struct EmptySlot EmptySlot; 22 DECLARE_INSTANCE_CHECKER(EmptySlot, EMPTY_SLOT, 23 TYPE_EMPTY_SLOT) 24 25 struct EmptySlot { 26 SysBusDevice parent_obj; 27 28 MemoryRegion iomem; 29 char *name; 30 uint64_t size; 31 }; 32 33 static uint64_t empty_slot_read(void *opaque, hwaddr addr, 34 unsigned size) 35 { 36 EmptySlot *s = EMPTY_SLOT(opaque); 37 38 trace_empty_slot_write(addr, size << 1, 0, size, s->name); 39 40 return 0; 41 } 42 43 static void empty_slot_write(void *opaque, hwaddr addr, 44 uint64_t val, unsigned size) 45 { 46 EmptySlot *s = EMPTY_SLOT(opaque); 47 48 trace_empty_slot_write(addr, size << 1, val, size, s->name); 49 } 50 51 static const MemoryRegionOps empty_slot_ops = { 52 .read = empty_slot_read, 53 .write = empty_slot_write, 54 .endianness = DEVICE_NATIVE_ENDIAN, 55 }; 56 57 void empty_slot_init(const char *name, hwaddr addr, uint64_t slot_size) 58 { 59 if (slot_size > 0) { 60 /* Only empty slots larger than 0 byte need handling. */ 61 DeviceState *dev; 62 63 dev = qdev_new(TYPE_EMPTY_SLOT); 64 65 qdev_prop_set_uint64(dev, "size", slot_size); 66 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); 67 68 sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, addr, -10000); 69 } 70 } 71 72 static void empty_slot_realize(DeviceState *dev, Error **errp) 73 { 74 EmptySlot *s = EMPTY_SLOT(dev); 75 76 if (s->name == NULL) { 77 s->name = g_strdup("empty-slot"); 78 } 79 memory_region_init_io(&s->iomem, OBJECT(s), &empty_slot_ops, s, 80 s->name, s->size); 81 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); 82 } 83 84 static Property empty_slot_properties[] = { 85 DEFINE_PROP_UINT64("size", EmptySlot, size, 0), 86 DEFINE_PROP_STRING("name", EmptySlot, name), 87 DEFINE_PROP_END_OF_LIST(), 88 }; 89 90 static void empty_slot_class_init(ObjectClass *klass, void *data) 91 { 92 DeviceClass *dc = DEVICE_CLASS(klass); 93 94 dc->realize = empty_slot_realize; 95 device_class_set_props(dc, empty_slot_properties); 96 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 97 } 98 99 static const TypeInfo empty_slot_info = { 100 .name = TYPE_EMPTY_SLOT, 101 .parent = TYPE_SYS_BUS_DEVICE, 102 .instance_size = sizeof(EmptySlot), 103 .class_init = empty_slot_class_init, 104 }; 105 106 static void empty_slot_register_types(void) 107 { 108 type_register_static(&empty_slot_info); 109 } 110 111 type_init(empty_slot_register_types) 112