libsidplayfp  2.2.2
SystemRAMBank.h
1 /*
2  * This file is part of libsidplayfp, a SID player engine.
3  *
4  * Copyright 2012-2021 Leandro Nini <drfiemost@users.sourceforge.net>
5  * Copyright 2010 Antti Lankila
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20  */
21 
22 #ifndef SYSTEMRAMBANK_H
23 #define SYSTEMRAMBANK_H
24 
25 #include <stdint.h>
26 #include <cstring>
27 
28 #include "Bank.h"
29 
30 #include "sidcxx11.h"
31 
32 namespace libsidplayfp
33 {
34 
38 class SystemRAMBank final : public Bank
39 {
40  friend class MMU;
41 
42 private:
44  uint8_t ram[0x10000];
45 
46 public:
58  void reset()
59  {
60  uint8_t byte = 0x00;
61  for (int j=0x0000; j<0x10000; j+=0x4000)
62  {
63  memset(ram+j, byte, 0x4000);
64  byte = ~byte;
65  for (int i = 0x02; i < 0x4000; i += 0x08)
66  {
67  memset(ram+j+i, byte, 0x04);
68  }
69  }
70  }
71 
72  uint8_t peek(uint_least16_t address) override
73  {
74  return ram[address];
75  }
76 
77  void poke(uint_least16_t address, uint8_t value) override
78  {
79  ram[address] = value;
80  }
81 };
82 
83 }
84 
85 #endif
Definition: Bank.h:36
Definition: mmu.h:50
Definition: SystemRAMBank.h:39
void reset()
Definition: SystemRAMBank.h:58
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