libsidplayfp  1.8.7
mmu.h
1 /*
2  * This file is part of libsidplayfp, a SID player engine.
3  *
4  * Copyright 2011-2015 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 "sidendian.h"
30 #include "sidmemory.h"
31 
32 #include "Banks/Bank.h"
33 #include "Banks/IOBank.h"
34 #include "Banks/SystemRAMBank.h"
35 #include "Banks/SystemROMBanks.h"
36 #include "Banks/ZeroRAMBank.h"
37 
38 #include <string.h>
39 
43 class MMU : public PLA, public sidmemory
44 {
45 private:
46  EventContext &context;
47 
49  bool loram, hiram, charen;
50 
52  Bank* cpuReadMap[16];
53 
55  Bank* cpuWriteMap[16];
56 
58  IOBank* ioBank;
59 
61  KernalRomBank kernalRomBank;
62 
64  BasicRomBank basicRomBank;
65 
67  CharacterRomBank characterRomBank;
68 
70  SystemRAMBank ramBank;
71 
73  ZeroRAMBank zeroRAMBank;
74 
75 private:
76  void setCpuPort(int state);
77  void updateMappingPHI2();
78  uint8_t getLastReadByte() const { return 0; }
79  event_clock_t getPhi2Time() const { return context.getTime(EVENT_CLOCK_PHI2); }
80 
81 public:
82  MMU(EventContext *context, IOBank* ioBank);
83  ~MMU () {}
84 
85  void reset();
86 
87  void setRoms(const uint8_t* kernal, const uint8_t* basic, const uint8_t* character)
88  {
89  kernalRomBank.set(kernal);
90  basicRomBank.set(basic);
91  characterRomBank.set(character);
92  }
93 
94  // RAM access methods
95  uint8_t readMemByte(uint_least16_t addr) { return ramBank.peek(addr); }
96  uint_least16_t readMemWord(uint_least16_t addr) { return endian_little16(ramBank.ram+addr); }
97 
98  void writeMemByte(uint_least16_t addr, uint8_t value) { ramBank.poke(addr, value); }
99  void writeMemWord(uint_least16_t addr, uint_least16_t value) { endian_little16(ramBank.ram+addr, value); }
100 
101  void fillRam(uint_least16_t start, uint8_t value, unsigned int size)
102  {
103  memset(ramBank.ram+start, value, size);
104  }
105  void fillRam(uint_least16_t start, const uint8_t* source, unsigned int size)
106  {
107  memcpy(ramBank.ram+start, source, size);
108  }
109 
110  // SID specific hacks
111  void installResetHook(uint_least16_t addr) { kernalRomBank.installResetHook(addr); }
112 
113  void installBasicTrap(uint_least16_t addr) { basicRomBank.installTrap(addr); }
114 
115  void setBasicSubtune(uint8_t tune) { basicRomBank.setSubtune(tune); }
116 
123  uint8_t cpuRead(uint_least16_t addr) const { return cpuReadMap[addr >> 12]->peek(addr); }
124 
131  void cpuWrite(uint_least16_t addr, uint8_t data) { cpuWriteMap[addr >> 12]->poke(addr, data); }
132 };
133 
134 #endif
uint8_t peek(uint_least16_t address)
Definition: SystemRAMBank.h:56
void writeMemWord(uint_least16_t addr, uint_least16_t value)
Definition: mmu.h:99
uint_least16_t readMemWord(uint_least16_t addr)
Definition: mmu.h:96
void installTrap(uint_least16_t addr)
Definition: SystemROMBanks.h:219
Definition: SystemROMBanks.h:247
Definition: SystemROMBanks.h:189
void cpuWrite(uint_least16_t addr, uint8_t data)
Definition: mmu.h:131
virtual uint8_t peek(uint_least16_t address)=0
Definition: event.h:107
uint8_t cpuRead(uint_least16_t addr) const
Definition: mmu.h:123
Definition: Bank.h:32
Definition: SystemRAMBank.h:35
Definition: ZeroRAMBank.h:35
void installResetHook(uint_least16_t addr)
Definition: mmu.h:111
void fillRam(uint_least16_t start, const uint8_t *source, unsigned int size)
Definition: mmu.h:105
void fillRam(uint_least16_t start, uint8_t value, unsigned int size)
Definition: mmu.h:101
Definition: mmu.h:43
void setBasicSubtune(uint8_t tune)
Definition: mmu.h:115
void set(const uint8_t *source)
Definition: SystemROMBanks.h:62
void writeMemByte(uint_least16_t addr, uint8_t value)
Definition: mmu.h:98
void installResetHook(uint_least16_t addr)
Definition: SystemROMBanks.h:177
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:95
Definition: ZeroRAMBank.h:60
Definition: IOBank.h:36
void installBasicTrap(uint_least16_t addr)
Definition: mmu.h:113
void poke(uint_least16_t address, uint8_t value)
Definition: SystemRAMBank.h:61
Definition: SystemROMBanks.h:77