openMSX
NowindInterface.cc
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1 #include "NowindInterface.hh"
2 #include "DiskChanger.hh"
3 #include "Clock.hh"
4 #include "MSXMotherBoard.hh"
5 #include "MSXException.hh"
6 #include "serialize.hh"
7 #include "serialize_stl.hh"
8 #include <cassert>
9 #include <functional>
10 #include <memory>
11 
12 namespace openmsx {
13 
15  : MSXDevice(config)
16  , rom(getName() + " ROM", "rom", config)
17  , flashConfig(rom.getSize() / 0x10000, {0x10000, false})
18  , flash(rom, flashConfig, 0x01A4,
20  , host(drives)
21  , basename("nowindX")
22 {
23  nowindsInUse = getMotherBoard().getSharedStuff<NowindsInUse>("nowindsInUse");
24 
25  unsigned i = 0;
26  while ((*nowindsInUse)[i]) {
27  if (++i == MAX_NOWINDS) {
28  throw MSXException("Too many nowind interfaces.");
29  }
30  }
31  (*nowindsInUse)[i] = true;
32  basename[6] = char('a' + i);
33 
34  command.emplace(basename, getCommandController(), *this);
35 
36  // start with one (empty) drive
37  auto drive = command->createDiskChanger(basename, 0, getMotherBoard());
38  drive->createCommand();
39  drives.push_back(std::move(drive));
40 
41  reset(EmuTime::dummy());
42 }
43 
45 {
46  unsigned i = basename[6] - 'a';
47  assert((*nowindsInUse)[i]);
48  (*nowindsInUse)[i] = false;
49 }
50 
51 void NowindInterface::reset(EmuTime::param /*time*/)
52 {
53  // version 1 didn't change the bank number
54  // version 2 (produced by Sunrise) does reset the bank number
55  bank = 0;
56 
57  // Flash state is NOT changed on reset
58  //flash.reset();
59 }
60 
61 byte NowindInterface::peekMem(word address, EmuTime::param /*time*/) const
62 {
63  if (((0x2000 <= address) && (address < 0x4000)) ||
64  ((0x8000 <= address) && (address < 0xA000))) {
65  return host.peek();
66  } else if ((0x4000 <= address) && (address < 0xC000)) {
67  // note: range 0x8000-0xA000 is already handled above
68  return flash.peek(bank * 0x4000 + (address & 0x3FFF));
69  } else {
70  return 0xFF;
71  }
72 }
73 
74 byte NowindInterface::readMem(word address, EmuTime::param /*time*/)
75 {
76  if (((0x2000 <= address) && (address < 0x4000)) ||
77  ((0x8000 <= address) && (address < 0xA000))) {
78  return host.read();
79  } else if ((0x4000 <= address) && (address < 0xC000)) {
80  // note: range 0x8000-0xA000 is already handled above
81  return flash.read(bank * 0x4000 + (address & 0x3FFF));
82  } else {
83  return 0xFF;
84  }
85 }
86 
87 const byte* NowindInterface::getReadCacheLine(word address) const
88 {
89  if (((0x2000 <= address) && (address < 0x4000)) ||
90  ((0x8000 <= address) && (address < 0xA000))) {
91  // nowind region, not cacheable
92  return nullptr;
93  } else if ((0x4000 <= address) && (address < 0xC000)) {
94  // note: range 0x8000-0xA000 is already handled above
95  return flash.getReadCacheLine(bank * 0x4000 + (address & 0x3FFF));
96  } else {
97  return unmappedRead;
98  }
99 }
100 
101 void NowindInterface::writeMem(word address, byte value, EmuTime::param time)
102 {
103  if (address < 0x4000) {
104  flash.write(bank * 0x4000 + address, value);
105  } else if (((0x4000 <= address) && (address < 0x6000)) ||
106  ((0x8000 <= address) && (address < 0xA000))) {
107  constexpr Clock<1000> clock(EmuTime::zero());
108  host.write(value, clock.getTicksTill(time));
109  } else if (((0x6000 <= address) && (address < 0x8000)) ||
110  ((0xA000 <= address) && (address < 0xC000))) {
111  byte max = rom.getSize() / (16 * 1024);
112  bank = (value < max) ? value : value & (max - 1);
113  invalidateDeviceRCache(0x4000, 0x4000);
114  invalidateDeviceRCache(0xA000, 0x2000);
115  }
116 }
117 
119 {
120  if (address < 0xC000) {
121  // not cacheable
122  return nullptr;
123  } else {
124  return unmappedWrite;
125  }
126 }
127 
128 
129 template<typename Archive>
130 void NowindInterface::serialize(Archive& ar, unsigned /*version*/)
131 {
132  ar.template serializeBase<MSXDevice>(*this);
133  ar.serialize("flash", flash);
134  ar.serializeWithID("drives", drives, std::ref(getMotherBoard()));
135  ar.serialize("nowindhost", host,
136  "bank", bank);
137 
138  // don't serialize command, rom, basename
139 }
142 
143 } // namespace openmsx
void write(unsigned address, byte value)
Definition: AmdFlash.cc:265
byte peek(unsigned address) const
Definition: AmdFlash.cc:212
byte read(unsigned address) const
Definition: AmdFlash.cc:248
const byte * getReadCacheLine(unsigned address) const
Definition: AmdFlash.cc:254
Represents a clock with a fixed frequency.
Definition: Clock.hh:19
An MSXDevice is an emulated hardware component connected to the bus of the emulated MSX.
Definition: MSXDevice.hh:33
MSXMotherBoard & getMotherBoard() const
Get the mother board this device belongs to.
Definition: MSXDevice.cc:71
void invalidateDeviceRCache()
Definition: MSXDevice.hh:210
static byte unmappedRead[0x10000]
Definition: MSXDevice.hh:301
static byte unmappedWrite[0x10000]
Definition: MSXDevice.hh:302
byte peek() const
Definition: NowindHost.cc:52
void write(byte data, unsigned time)
Definition: NowindHost.cc:70
const byte * getReadCacheLine(word address) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for reading.
byte * getWriteCacheLine(word address) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
void reset(EmuTime::param time) override
This method is called on reset.
byte peekMem(word address, EmuTime::param time) const override
Read a byte from a given memory location.
byte readMem(word address, EmuTime::param time) override
Read a byte from a location at a certain time from this device.
NowindInterface(const DeviceConfig &config)
void serialize(Archive &ar, unsigned version)
void writeMem(word address, byte value, EmuTime::param time) override
Write a given byte to a given location at a certain time to this device.
unsigned getSize() const
Definition: Rom.hh:34
constexpr vecN< N, T > max(const vecN< N, T > &x, const vecN< N, T > &y)
Definition: gl_vec.hh:287
std::string getName(KeyCode keyCode)
Translate key code to key name.
Definition: Keys.cc:741
This file implemented 3 utility functions:
Definition: Autofire.cc:9
REGISTER_MSXDEVICE(ChakkariCopy, "ChakkariCopy")
uint16_t word
16 bit unsigned integer
Definition: openmsx.hh:29
#define INSTANTIATE_SERIALIZE_METHODS(CLASS)
Definition: serialize.hh:998