1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* QEMU Empty Slot
*
* The empty_slot device emulates known to a bus but not connected devices.
*
* Copyright (c) 2010 Artyom Tarasenko
*
* This code is licensed under the GNU GPL v2 or (at your option) any later
* version.
*/
#include "hw.h"
#include "sysbus.h"
#include "empty_slot.h"
//#define DEBUG_EMPTY_SLOT
#ifdef DEBUG_EMPTY_SLOT
#define DPRINTF(fmt, ...) \
do { printf("empty_slot: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
typedef struct EmptySlot {
SysBusDevice busdev;
MemoryRegion iomem;
uint64_t size;
} EmptySlot;
static uint64_t empty_slot_read(void *opaque, target_phys_addr_t addr,
unsigned size)
{
DPRINTF("read from " TARGET_FMT_plx "\n", addr);
return 0;
}
static void empty_slot_write(void *opaque, target_phys_addr_t addr,
uint64_t val, unsigned size)
{
DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", (unsigned)val, addr);
}
static const MemoryRegionOps empty_slot_ops = {
.read = empty_slot_read,
.write = empty_slot_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
void empty_slot_init(target_phys_addr_t addr, uint64_t slot_size)
{
if (slot_size > 0) {
/* Only empty slots larger than 0 byte need handling. */
DeviceState *dev;
SysBusDevice *s;
EmptySlot *e;
dev = qdev_create(NULL, "empty_slot");
s = sysbus_from_qdev(dev);
e = FROM_SYSBUS(EmptySlot, s);
e->size = slot_size;
qdev_init_nofail(dev);
sysbus_mmio_map(s, 0, addr);
}
}
static int empty_slot_init1(SysBusDevice *dev)
{
EmptySlot *s = FROM_SYSBUS(EmptySlot, dev);
memory_region_init_io(&s->iomem, &empty_slot_ops, s,
"empty-slot", s->size);
sysbus_init_mmio(dev, &s->iomem);
return 0;
}
static void empty_slot_class_init(ObjectClass *klass, void *data)
{
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = empty_slot_init1;
}
static DeviceInfo empty_slot_info = {
.name = "empty_slot",
.size = sizeof(EmptySlot),
.class_init = empty_slot_class_init,
};
static void empty_slot_register_devices(void)
{
sysbus_register_withprop(&empty_slot_info);
}
device_init(empty_slot_register_devices);
|
