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
|
#include "devices.h"
void bus_t::add_device(reg_t addr, abstract_device_t* dev)
{
// Searching devices via lower_bound/upper_bound
// implicitly relies on the underlying std::map
// container to sort the keys and provide ordered
// iteration over this sort, which it does. (python's
// SortedDict is a good analogy)
devices[addr] = dev;
}
bool bus_t::load(reg_t addr, size_t len, uint8_t* bytes)
{
// Find the device with the base address closest to but
// less than addr (price-is-right search)
auto it = devices.upper_bound(addr);
if (devices.empty() || it == devices.begin()) {
// Either the bus is empty, or there weren't
// any items with a base address <= addr
return false;
}
// Found at least one item with base address <= addr
// The iterator points to the device after this, so
// go back by one item.
it--;
return it->second->load(addr - it->first, len, bytes);
}
bool bus_t::store(reg_t addr, size_t len, const uint8_t* bytes)
{
// See comments in bus_t::load
auto it = devices.upper_bound(addr);
if (devices.empty() || it == devices.begin()) {
return false;
}
it--;
return it->second->store(addr - it->first, len, bytes);
}
std::pair<reg_t, abstract_device_t*> bus_t::find_device(reg_t addr)
{
// See comments in bus_t::load
auto it = devices.upper_bound(addr);
if (devices.empty() || it == devices.begin()) {
return std::make_pair((reg_t)0, (abstract_device_t*)NULL);
}
it--;
return std::make_pair(it->first, it->second);
}
// Type for holding all registered MMIO plugins by name.
using mmio_plugin_map_t = std::map<std::string, mmio_plugin_t>;
// Simple singleton instance of an mmio_plugin_map_t.
static mmio_plugin_map_t& mmio_plugin_map()
{
static mmio_plugin_map_t instance;
return instance;
}
void register_mmio_plugin(const char* name_cstr,
const mmio_plugin_t* mmio_plugin)
{
std::string name(name_cstr);
if (!mmio_plugin_map().emplace(name, *mmio_plugin).second) {
throw std::runtime_error("Plugin \"" + name + "\" already registered!");
}
}
mmio_plugin_device_t::mmio_plugin_device_t(const std::string& name,
const std::string& args)
: plugin(mmio_plugin_map().at(name)), user_data((*plugin.alloc)(args.c_str()))
{
}
mmio_plugin_device_t::~mmio_plugin_device_t()
{
(*plugin.dealloc)(user_data);
}
bool mmio_plugin_device_t::load(reg_t addr, size_t len, uint8_t* bytes)
{
return (*plugin.load)(user_data, addr, len, bytes);
}
bool mmio_plugin_device_t::store(reg_t addr, size_t len, const uint8_t* bytes)
{
return (*plugin.store)(user_data, addr, len, bytes);
}
|
