PPC: e500: msync is 440 only, e500 has real sync
[qemu.git] / hw / empty_slot.c
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 "hw.h"
13 #include "sysbus.h"
14 #include "empty_slot.h"
15
16 //#define DEBUG_EMPTY_SLOT
17
18 #ifdef DEBUG_EMPTY_SLOT
19 #define DPRINTF(fmt, ...) \
20 do { printf("empty_slot: " fmt , ## __VA_ARGS__); } while (0)
21 #else
22 #define DPRINTF(fmt, ...) do {} while (0)
23 #endif
24
25 typedef struct EmptySlot {
26 SysBusDevice busdev;
27 MemoryRegion iomem;
28 uint64_t size;
29 } EmptySlot;
30
31 static uint64_t empty_slot_read(void *opaque, target_phys_addr_t addr,
32 unsigned size)
33 {
34 DPRINTF("read from " TARGET_FMT_plx "\n", addr);
35 return 0;
36 }
37
38 static void empty_slot_write(void *opaque, target_phys_addr_t addr,
39 uint64_t val, unsigned size)
40 {
41 DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", (unsigned)val, addr);
42 }
43
44 static const MemoryRegionOps empty_slot_ops = {
45 .read = empty_slot_read,
46 .write = empty_slot_write,
47 .endianness = DEVICE_NATIVE_ENDIAN,
48 };
49
50 void empty_slot_init(target_phys_addr_t addr, uint64_t slot_size)
51 {
52 if (slot_size > 0) {
53 /* Only empty slots larger than 0 byte need handling. */
54 DeviceState *dev;
55 SysBusDevice *s;
56 EmptySlot *e;
57
58 dev = qdev_create(NULL, "empty_slot");
59 s = sysbus_from_qdev(dev);
60 e = FROM_SYSBUS(EmptySlot, s);
61 e->size = slot_size;
62
63 qdev_init_nofail(dev);
64
65 sysbus_mmio_map(s, 0, addr);
66 }
67 }
68
69 static int empty_slot_init1(SysBusDevice *dev)
70 {
71 EmptySlot *s = FROM_SYSBUS(EmptySlot, dev);
72
73 memory_region_init_io(&s->iomem, &empty_slot_ops, s,
74 "empty-slot", s->size);
75 sysbus_init_mmio(dev, &s->iomem);
76 return 0;
77 }
78
79 static void empty_slot_class_init(ObjectClass *klass, void *data)
80 {
81 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
82
83 k->init = empty_slot_init1;
84 }
85
86 static DeviceInfo empty_slot_info = {
87 .name = "empty_slot",
88 .size = sizeof(EmptySlot),
89 .class_init = empty_slot_class_init,
90 };
91
92 static void empty_slot_register_devices(void)
93 {
94 sysbus_register_withprop(&empty_slot_info);
95 }
96
97 device_init(empty_slot_register_devices);