root / hw / empty_slot.c @ d2d979c6
History | View | Annotate | Download (2.3 kB)
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 |
uint64_t size; |
28 |
} EmptySlot; |
29 |
|
30 |
static uint32_t empty_slot_readl(void *opaque, target_phys_addr_t addr) |
31 |
{ |
32 |
DPRINTF("read from " TARGET_FMT_plx "\n", addr); |
33 |
return 0; |
34 |
} |
35 |
|
36 |
static void empty_slot_writel(void *opaque, target_phys_addr_t addr, |
37 |
uint32_t val) |
38 |
{ |
39 |
DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", val, addr); |
40 |
} |
41 |
|
42 |
CPUReadMemoryFunc * const empty_slot_read[3] = { |
43 |
empty_slot_readl, |
44 |
empty_slot_readl, |
45 |
empty_slot_readl, |
46 |
}; |
47 |
|
48 |
static CPUWriteMemoryFunc * const empty_slot_write[3] = { |
49 |
empty_slot_writel, |
50 |
empty_slot_writel, |
51 |
empty_slot_writel, |
52 |
}; |
53 |
|
54 |
void empty_slot_init(target_phys_addr_t 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 |
SysBusDevice *s; |
60 |
EmptySlot *e; |
61 |
|
62 |
dev = qdev_create(NULL, "empty_slot"); |
63 |
s = sysbus_from_qdev(dev); |
64 |
e = FROM_SYSBUS(EmptySlot, s); |
65 |
e->size = slot_size; |
66 |
|
67 |
qdev_init_nofail(dev); |
68 |
|
69 |
sysbus_mmio_map(s, 0, addr);
|
70 |
} |
71 |
} |
72 |
|
73 |
static int empty_slot_init1(SysBusDevice *dev) |
74 |
{ |
75 |
EmptySlot *s = FROM_SYSBUS(EmptySlot, dev); |
76 |
ram_addr_t empty_slot_offset; |
77 |
|
78 |
empty_slot_offset = cpu_register_io_memory(empty_slot_read, |
79 |
empty_slot_write, s, |
80 |
DEVICE_NATIVE_ENDIAN); |
81 |
sysbus_init_mmio(dev, s->size, empty_slot_offset | IO_MEM_RAM); |
82 |
return 0; |
83 |
} |
84 |
|
85 |
static SysBusDeviceInfo empty_slot_info = {
|
86 |
.init = empty_slot_init1, |
87 |
.qdev.name = "empty_slot",
|
88 |
.qdev.size = sizeof(EmptySlot),
|
89 |
}; |
90 |
|
91 |
static void empty_slot_register_devices(void) |
92 |
{ |
93 |
sysbus_register_withprop(&empty_slot_info); |
94 |
} |
95 |
|
96 |
device_init(empty_slot_register_devices); |