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 19 #define TYPE_EMPTY_SLOT "empty_slot" 20 #define EMPTY_SLOT(obj) OBJECT_CHECK(EmptySlot, (obj), TYPE_EMPTY_SLOT) 21 22 typedef struct EmptySlot { 23 SysBusDevice parent_obj; 24 25 MemoryRegion iomem; 26 char *name; 27 uint64_t size; 28 } EmptySlot; 29 30 static uint64_t empty_slot_read(void *opaque, hwaddr addr, 31 unsigned size) 32 { 33 EmptySlot *s = EMPTY_SLOT(opaque); 34 35 trace_empty_slot_write(addr, size << 1, 0, size, s->name); 36 37 return 0; 38 } 39 40 static void empty_slot_write(void *opaque, hwaddr addr, 41 uint64_t val, unsigned size) 42 { 43 EmptySlot *s = EMPTY_SLOT(opaque); 44 45 trace_empty_slot_write(addr, size << 1, val, size, s->name); 46 } 47 48 static const MemoryRegionOps empty_slot_ops = { 49 .read = empty_slot_read, 50 .write = empty_slot_write, 51 .endianness = DEVICE_NATIVE_ENDIAN, 52 }; 53 54 void empty_slot_init(const char *name, hwaddr addr, uint64_t slot_size) 55 { 56 if (slot_size > 0) { 57 /* Only empty slots larger than 0 byte need handling. */ 58 DeviceState *dev; 59 60 dev = qdev_new(TYPE_EMPTY_SLOT); 61 62 qdev_prop_set_uint64(dev, "size", slot_size); 63 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); 64 65 sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, addr, -10000); 66 } 67 } 68 69 static void empty_slot_realize(DeviceState *dev, Error **errp) 70 { 71 EmptySlot *s = EMPTY_SLOT(dev); 72 73 if (s->name == NULL) { 74 s->name = g_strdup("empty-slot"); 75 } 76 memory_region_init_io(&s->iomem, OBJECT(s), &empty_slot_ops, s, 77 s->name, s->size); 78 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); 79 } 80 81 static Property empty_slot_properties[] = { 82 DEFINE_PROP_UINT64("size", EmptySlot, size, 0), 83 DEFINE_PROP_STRING("name", EmptySlot, name), 84 DEFINE_PROP_END_OF_LIST(), 85 }; 86 87 static void empty_slot_class_init(ObjectClass *klass, void *data) 88 { 89 DeviceClass *dc = DEVICE_CLASS(klass); 90 91 dc->realize = empty_slot_realize; 92 device_class_set_props(dc, empty_slot_properties); 93 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 94 } 95 96 static const TypeInfo empty_slot_info = { 97 .name = TYPE_EMPTY_SLOT, 98 .parent = TYPE_SYS_BUS_DEVICE, 99 .instance_size = sizeof(EmptySlot), 100 .class_init = empty_slot_class_init, 101 }; 102 103 static void empty_slot_register_types(void) 104 { 105 type_register_static(&empty_slot_info); 106 } 107 108 type_init(empty_slot_register_types) 109