]> git.proxmox.com Git - mirror_qemu.git/blame - hw/empty_slot.c
isa: always use provided ISA bus when creating an isa device
[mirror_qemu.git] / hw / empty_slot.c
CommitLineData
da9fcfa5
AT
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
25typedef struct EmptySlot {
26 SysBusDevice busdev;
b0a941b0 27 MemoryRegion iomem;
da9fcfa5
AT
28 uint64_t size;
29} EmptySlot;
30
b0a941b0
AK
31static uint64_t empty_slot_read(void *opaque, target_phys_addr_t addr,
32 unsigned size)
da9fcfa5
AT
33{
34 DPRINTF("read from " TARGET_FMT_plx "\n", addr);
35 return 0;
36}
37
b0a941b0
AK
38static void empty_slot_write(void *opaque, target_phys_addr_t addr,
39 uint64_t val, unsigned size)
da9fcfa5 40{
b0a941b0 41 DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", (unsigned)val, addr);
da9fcfa5
AT
42}
43
b0a941b0
AK
44static const MemoryRegionOps empty_slot_ops = {
45 .read = empty_slot_read,
46 .write = empty_slot_write,
47 .endianness = DEVICE_NATIVE_ENDIAN,
da9fcfa5
AT
48};
49
50void empty_slot_init(target_phys_addr_t addr, uint64_t slot_size)
51{
1a00282a
SW
52 if (slot_size > 0) {
53 /* Only empty slots larger than 0 byte need handling. */
54 DeviceState *dev;
55 SysBusDevice *s;
56 EmptySlot *e;
da9fcfa5 57
1a00282a
SW
58 dev = qdev_create(NULL, "empty_slot");
59 s = sysbus_from_qdev(dev);
60 e = FROM_SYSBUS(EmptySlot, s);
61 e->size = slot_size;
da9fcfa5 62
1a00282a 63 qdev_init_nofail(dev);
da9fcfa5 64
1a00282a
SW
65 sysbus_mmio_map(s, 0, addr);
66 }
da9fcfa5
AT
67}
68
69static int empty_slot_init1(SysBusDevice *dev)
70{
71 EmptySlot *s = FROM_SYSBUS(EmptySlot, dev);
da9fcfa5 72
b0a941b0
AK
73 memory_region_init_io(&s->iomem, &empty_slot_ops, s,
74 "empty-slot", s->size);
750ecd44 75 sysbus_init_mmio(dev, &s->iomem);
da9fcfa5
AT
76 return 0;
77}
78
79static SysBusDeviceInfo empty_slot_info = {
80 .init = empty_slot_init1,
81 .qdev.name = "empty_slot",
82 .qdev.size = sizeof(EmptySlot),
83};
84
85static void empty_slot_register_devices(void)
86{
87 sysbus_register_withprop(&empty_slot_info);
88}
89
90device_init(empty_slot_register_devices);