libsidplayfp  1.4.1
mmu.h
1 /*
2  * This file is part of libsidplayfp, a SID player engine.
3  *
4  * Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
5  * Copyright 2007-2010 Antti Lankila
6  * Copyright 2000 Simon White
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef MMU_H
24 #define MMU_H
25 
26 #include <stdint.h>
27 
28 #include "sidplayfp/event.h"
29 #include "sidplayfp/sidendian.h"
30 #include "sidplayfp/sidmemory.h"
31 
32 #include "Banks/Bank.h"
33 #include "Banks/SystemRAMBank.h"
34 #include "Banks/SystemROMBanks.h"
35 #include "Banks/ZeroRAMBank.h"
36 
37 #include <string.h>
38 
42 class MMU : public PLA, public sidmemory
43 {
44 private:
45  EventContext &context;
46 
48  bool loram, hiram, charen;
49 
51  Bank* cpuReadMap[16];
52 
54  Bank* cpuWriteMap[16];
55 
57  Bank* ioBank;
58 
60  KernalRomBank kernalRomBank;
61 
63  BasicRomBank basicRomBank;
64 
66  CharacterRomBank characterRomBank;
67 
69  SystemRAMBank ramBank;
70 
71  ZeroRAMBank zeroRAMBank;
72 
73 private:
74  void setCpuPort(int state);
75  void updateMappingPHI2();
76  uint8_t getLastReadByte() const { return 0; }
77  event_clock_t getPhi2Time() const { return context.getTime(EVENT_CLOCK_PHI2); }
78 
79 public:
80  MMU(EventContext *context, Bank* ioBank);
81  ~MMU () {}
82 
83  void reset();
84 
85  void setRoms(const uint8_t* kernal, const uint8_t* basic, const uint8_t* character)
86  {
87  kernalRomBank.set(kernal);
88  basicRomBank.set(basic);
89  characterRomBank.set(character);
90  }
91 
92  // RAM access methods
93  uint8_t readMemByte(uint_least16_t addr) { return ramBank.peek(addr); }
94  uint_least16_t readMemWord(uint_least16_t addr) { return endian_little16(ramBank.ram+addr); }
95 
96  void writeMemByte(uint_least16_t addr, uint8_t value) { ramBank.poke(addr, value); }
97  void writeMemWord(uint_least16_t addr, uint_least16_t value) { endian_little16(ramBank.ram+addr, value); }
98 
99  void fillRam(uint_least16_t start, uint8_t value, unsigned int size)
100  {
101  memset(ramBank.ram+start, value, size);
102  }
103  void fillRam(uint_least16_t start, const uint8_t* source, unsigned int size)
104  {
105  memcpy(ramBank.ram+start, source, size);
106  }
107 
108  // SID specific hacks
109  void installResetHook(uint_least16_t addr) { kernalRomBank.installResetHook(addr); }
110 
111  void installBasicTrap(uint_least16_t addr) { basicRomBank.installTrap(addr); }
112 
113  void setBasicSubtune(uint8_t tune) { basicRomBank.setSubtune(tune); }
114 
121  uint8_t cpuRead(uint_least16_t addr) const { return cpuReadMap[addr >> 12]->peek(addr); }
122 
129  void cpuWrite(uint_least16_t addr, uint8_t data) { cpuWriteMap[addr >> 12]->poke(addr, data); }
130 };
131 
132 #endif
uint8_t peek(uint_least16_t address)
Definition: SystemRAMBank.h:54
void writeMemWord(uint_least16_t addr, uint_least16_t value)
Definition: mmu.h:97
uint_least16_t readMemWord(uint_least16_t addr)
Definition: mmu.h:94
uint8_t cpuRead(uint_least16_t addr) const
Definition: mmu.h:121
void installTrap(uint_least16_t addr)
Definition: SystemROMBanks.h:205
Definition: SystemROMBanks.h:231
Definition: SystemROMBanks.h:175
void cpuWrite(uint_least16_t addr, uint8_t data)
Definition: mmu.h:129
virtual uint8_t peek(uint_least16_t address)=0
Definition: event.h:101
Definition: Bank.h:32
Definition: SystemRAMBank.h:35
Definition: ZeroRAMBank.h:34
void installResetHook(uint_least16_t addr)
Definition: mmu.h:109
void fillRam(uint_least16_t start, const uint8_t *source, unsigned int size)
Definition: mmu.h:103
void fillRam(uint_least16_t start, uint8_t value, unsigned int size)
Definition: mmu.h:99
Definition: mmu.h:42
void setBasicSubtune(uint8_t tune)
Definition: mmu.h:113
void set(const uint8_t *source)
Copy content from source buffer.
Definition: SystemROMBanks.h:54
void writeMemByte(uint_least16_t addr, uint8_t value)
Definition: mmu.h:96
void installResetHook(uint_least16_t addr)
Definition: SystemROMBanks.h:165
virtual event_clock_t getTime(event_phase_t phase) const =0
Definition: sidmemory.h:30
virtual void poke(uint_least16_t address, uint8_t value)=0
uint8_t readMemByte(uint_least16_t addr)
Definition: mmu.h:93
Definition: ZeroRAMBank.h:56
void installBasicTrap(uint_least16_t addr)
Definition: mmu.h:111
void poke(uint_least16_t address, uint8_t value)
Definition: SystemRAMBank.h:59
Definition: SystemROMBanks.h:65