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
|
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
nvram.h
Generic non-volatile RAM.
***************************************************************************/
#ifndef MAME_MACHINE_NVRAM_H
#define MAME_MACHINE_NVRAM_H
#pragma once
class nvram_device : public device_t,
public device_nvram_interface
{
public:
// custom initialization for default state
typedef device_delegate<void (nvram_device &, void *, size_t)> init_delegate;
// values
enum default_value
{
DEFAULT_ALL_0,
DEFAULT_ALL_1,
DEFAULT_RANDOM,
DEFAULT_CUSTOM,
DEFAULT_NONE
};
// construction/destruction
nvram_device(const machine_config &mconfig, const char *tag, device_t *owner, default_value value)
: nvram_device(mconfig, tag, owner, 0)
{
set_default_value(value);
}
nvram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
// inline configuration helpers
void set_default_value(default_value value) { m_default_value = value; }
template <typename... T> void set_custom_handler(T &&... args)
{
m_default_value = DEFAULT_CUSTOM;
m_custom_handler.set(std::forward<T>(args)...);
}
// controls
void set_base(void *base, size_t length) { m_base = base; m_length = length; }
protected:
// device-level overrides
virtual void device_start() override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual void nvram_read(emu_file &file) override;
virtual void nvram_write(emu_file &file) override;
virtual bool nvram_can_write() override { return m_base && m_length; }
// internal helpers
void determine_final_base();
// configuration state
optional_memory_region m_region;
default_value m_default_value;
init_delegate m_custom_handler;
// runtime state
void * m_base;
size_t m_length;
};
DECLARE_DEVICE_TYPE(NVRAM, nvram_device)
#endif // MAME_DEVICES_MACHINE_NVRAM_H
|