OXYGENHUB
◆ main openmsx / src / memory / MSXRam.cc
1.9 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
1 
#include "MSXRam.hh"
2
3 
#include "XMLElement.hh"
4 
#include "serialize.hh"
5
6 
#include "narrow.hh"
7
8 
#include <cassert>
9
10 
namespace openmsx {
11
12 
MSXRam::MSXRam(const DeviceConfig& config)
13 
	: MSXDevice(config)
14 
{
15 
	// Actual initialization is done in init() because <mem> tags
16 
	// are not yet processed.
17 
}
18
19 
void MSXRam::init()
20 
{
21 
	MSXDevice::init(); // parse mem regions
22
23 
	// by default get base/size from the (union of) the <mem> tag(s)
24 
	getVisibleMemRegion(base, size);
25 
	// but allow to override these two parameters
26 
	base = getDeviceConfig().getChildDataAsInt("base", narrow_cast<int>(base));
27 
	size = getDeviceConfig().getChildDataAsInt("size", narrow_cast<int>(size));
28 
	assert( base         <  0x10000);
29 
	assert((base + size) <= 0x10000);
30
31 
	checkedRam.emplace(getDeviceConfig2(), getName(), "ram", size);
32 
	powerUp(getCurrentTime());
33 
}
34
35 
void MSXRam::powerUp(EmuTime /*time*/)
36 
{
37 
	checkedRam->clear();
38 
}
39
40 
unsigned MSXRam::translate(unsigned address) const
41 
{
42 
	address -= base;
43 
	if (address >= size) address &= (size - 1);
44 
	return address;
45 
}
46
47 
byte MSXRam::peekMem(uint16_t address, EmuTime /*time*/) const
48 
{
49 
	return checkedRam->peek(translate(address));
50 
}
51
52 
byte MSXRam::readMem(uint16_t address, EmuTime /*time*/)
53 
{
54 
	return checkedRam->read(translate(address));
55 
}
56
57 
void MSXRam::writeMem(uint16_t address, byte value, EmuTime /*time*/)
58 
{
59 
	checkedRam->write(translate(address), value);
60 
}
61
62 
const byte* MSXRam::getReadCacheLine(uint16_t start) const
63 
{
64 
	return checkedRam->getReadCacheLine(translate(start));
65 
}
66
67 
byte* MSXRam::getWriteCacheLine(uint16_t start)
68 
{
69 
	return checkedRam->getWriteCacheLine(translate(start));
70 
}
71
72 
template<typename Archive>
73 
void MSXRam::serialize(Archive& ar, unsigned /*version*/)
74 
{
75 
	ar.template serializeBase<MSXDevice>(*this);
76 
	// TODO ar.serialize("checkedRam", checkedRam);
77 
	ar.serialize("ram", checkedRam->getUncheckedRam());
78 
}
79 
INSTANTIATE_SERIALIZE_METHODS(MSXRam);
80 
REGISTER_MSXDEVICE(MSXRam, "Ram");
81
82 
} // namespace openmsx