openMSX
MusicalMemoryMapper.hh
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1 #ifndef MUSICALMEMORYMAPPER_HH
2 #define MUSICALMEMORYMAPPER_HH
3 
4 #include "MSXMemoryMapperBase.hh"
5 #include "SN76489.hh"
6 
7 namespace openmsx {
8 
14 {
15 public:
16  MusicalMemoryMapper(const DeviceConfig& config);
17 
18  void reset(EmuTime::param time) override;
19  [[nodiscard]] byte readIO(word port, EmuTime::param time) override;
20  [[nodiscard]] byte peekIO(word port, EmuTime::param time) const override;
21  void writeIO(word port, byte value, EmuTime::param time) override;
22  [[nodiscard]] byte peekMem(word address, EmuTime::param time) const override;
23  [[nodiscard]] byte readMem(word address, EmuTime::param time) override;
24  void writeMem(word address, byte value, EmuTime::param time) override;
25  [[nodiscard]] const byte* getReadCacheLine(word start) const override;
26  [[nodiscard]] byte* getWriteCacheLine(word start) const override;
27 
28  template<typename Archive>
29  void serialize(Archive& ar, unsigned version);
30 
31 private:
36  [[nodiscard]] int readReg(word address) const;
37 
41  [[nodiscard]] bool registerAccessAt(word address) const;
42 
46  [[nodiscard]] bool writeProtected(word address) const {
47  unsigned page = address >> 14;
48  return (controlReg & (1 << page)) != 0;
49  }
50 
51  void updateControlReg(byte value);
52 
53 private:
54  SN76489 sn76489;
55  byte controlReg;
56 };
57 
58 } // namespace openmsx
59 
60 #endif
Memory mapper which also controls an SN76489AN sound chip.
byte * getWriteCacheLine(word start) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
byte peekIO(word port, EmuTime::param time) const override
Read a byte from a given IO port.
byte readIO(word port, EmuTime::param time) override
Read a byte from an IO port at a certain time from this device.
void reset(EmuTime::param time) override
This method is called on reset.
const byte * getReadCacheLine(word start) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for reading.
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.
void serialize(Archive &ar, unsigned version)
void writeIO(word port, byte value, EmuTime::param time) override
Write a byte to a given IO port at a certain time to this device.
byte readMem(word address, EmuTime::param time) override
Read a byte from a location at a certain time from this device.
MusicalMemoryMapper(const DeviceConfig &config)
byte peekMem(word address, EmuTime::param time) const override
Read a byte from a given memory location.
This class implements the Texas Instruments SN76489 sound chip.
Definition: SN76489.hh:25
This file implemented 3 utility functions:
Definition: Autofire.cc:9
uint16_t word
16 bit unsigned integer
Definition: openmsx.hh:29