libsidplayfp 2.7.1
mmu.h
1/*
2 * This file is part of libsidplayfp, a SID player engine.
3 *
4 * Copyright 2011-2021 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 "sidendian.h"
29#include "sidmemory.h"
30#include "EventScheduler.h"
31
32#include "Banks/pla.h"
33#include "Banks/SystemRAMBank.h"
34#include "Banks/SystemROMBanks.h"
35#include "Banks/ZeroRAMBank.h"
36
37#include "sidcxx11.h"
38
39#include <string.h>
40
41namespace libsidplayfp
42{
43
44class Bank;
45class IOBank;
46
50class MMU final : public PLA, public sidmemory
51{
52private:
53 EventScheduler &eventScheduler;
54
56 bool loram, hiram, charen;
57
59 Bank* cpuReadMap[16];
60
62 Bank* cpuWriteMap[16];
63
65 IOBank* ioBank;
66
68 KernalRomBank kernalRomBank;
69
71 BasicRomBank basicRomBank;
72
74 CharacterRomBank characterRomBank;
75
77 SystemRAMBank ramBank;
78
80 ZeroRAMBank zeroRAMBank;
81
83 mutable unsigned int seed;
84
85private:
86 void setCpuPort(uint8_t state) override;
87 uint8_t getLastReadByte() const override;
88 event_clock_t getPhi2Time() const override { return eventScheduler.getTime(EVENT_CLOCK_PHI2); }
89
90 void updateMappingPHI2();
91
92public:
93 MMU(EventScheduler &eventScheduler, IOBank* ioBank);
94
95 void reset();
96
97 // ROM banks methods
98 void setKernal(const uint8_t* rom) override { kernalRomBank.set(rom); }
99 void setBasic(const uint8_t* rom) override { basicRomBank.set(rom); }
100 void setChargen(const uint8_t* rom) override { characterRomBank.set(rom); }
101
102 // RAM access methods
103 uint8_t readMemByte(uint_least16_t addr) override { return ramBank.peek(addr); }
104 uint_least16_t readMemWord(uint_least16_t addr) override { return endian_little16(ramBank.ram+addr); }
105
106 void writeMemByte(uint_least16_t addr, uint8_t value) override { ramBank.poke(addr, value); }
107 void writeMemWord(uint_least16_t addr, uint_least16_t value) override { endian_little16(ramBank.ram+addr, value); }
108
109 void fillRam(uint_least16_t start, uint8_t value, unsigned int size) override
110 {
111 memset(ramBank.ram+start, value, size);
112 }
113 void fillRam(uint_least16_t start, const uint8_t* source, unsigned int size) override
114 {
115 memcpy(ramBank.ram+start, source, size);
116 }
117
118 // SID specific hacks
119 void installResetHook(uint_least16_t addr) override { kernalRomBank.installResetHook(addr); }
120
121 void installBasicTrap(uint_least16_t addr) override { basicRomBank.installTrap(addr); }
122
123 void setBasicSubtune(uint8_t tune) override { basicRomBank.setSubtune(tune); }
124
131 uint8_t cpuRead(uint_least16_t addr) const { return cpuReadMap[addr >> 12]->peek(addr); }
132
139 void cpuWrite(uint_least16_t addr, uint8_t data) { cpuWriteMap[addr >> 12]->poke(addr, data); }
140};
141
142}
143
144#endif
Definition Bank.h:36
virtual uint8_t peek(uint_least16_t address)=0
virtual void poke(uint_least16_t address, uint8_t value)=0
Definition SystemROMBanks.h:153
void installTrap(uint_least16_t addr)
Definition SystemROMBanks.h:182
Definition SystemROMBanks.h:210
Definition EventScheduler.h:62
event_clock_t getTime(event_phase_t phase) const
Definition EventScheduler.h:162
Definition IOBank.h:40
Definition SystemROMBanks.h:89
void installResetHook(uint_least16_t addr)
Definition SystemROMBanks.h:140
Definition mmu.h:51
void installBasicTrap(uint_least16_t addr) override
Definition mmu.h:121
void cpuWrite(uint_least16_t addr, uint8_t data)
Definition mmu.h:139
void installResetHook(uint_least16_t addr) override
Definition mmu.h:119
uint8_t readMemByte(uint_least16_t addr) override
Definition mmu.h:103
void writeMemWord(uint_least16_t addr, uint_least16_t value) override
Definition mmu.h:107
void setBasicSubtune(uint8_t tune) override
Definition mmu.h:123
void writeMemByte(uint_least16_t addr, uint8_t value) override
Definition mmu.h:106
void setKernal(const uint8_t *rom) override
Definition mmu.h:98
void fillRam(uint_least16_t start, uint8_t value, unsigned int size) override
Definition mmu.h:109
void fillRam(uint_least16_t start, const uint8_t *source, unsigned int size) override
Definition mmu.h:113
uint_least16_t readMemWord(uint_least16_t addr) override
Definition mmu.h:104
uint8_t cpuRead(uint_least16_t addr) const
Definition mmu.h:131
Definition pla.h:35
Definition SystemRAMBank.h:39
uint8_t peek(uint_least16_t address) override
Definition SystemRAMBank.h:72
void poke(uint_least16_t address, uint8_t value) override
Definition SystemRAMBank.h:77
Definition ZeroRAMBank.h:132
void set(const uint8_t *source)
Definition SystemROMBanks.h:70
Definition sidmemory.h:34