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1.1 root 1: //
2: // nono
3: // Copyright (C) 2020 nono project
4: // Licensed under nono-license.txt
5: //
6:
7: //
8: // サブメモリ
9: //
10:
11: // SubRAM はバイト配置とする。
12:
13: #include "subram.h"
14: #include "mainapp.h"
15:
16: //
17: // 共通クラス
18: //
19:
20: // コンストラクタ
21: SubRAMBaseDevice::SubRAMBaseDevice(int objid_, uint ramsize_kb)
22: : inherited(objid_)
23: {
24: ramsize = ramsize_kb * 1024;
25:
26: ram.reset(new uint8[ramsize]);
27: memset(&ram[0], 0, ramsize);
28: }
29:
30: // デストラクタ
31: SubRAMBaseDevice::~SubRAMBaseDevice()
32: {
33: }
34:
35: // リセット
36: void
37: SubRAMBaseDevice::ResetHard(bool poweron)
38: {
39: if (poweron) {
40: // 実際にはゼロ初期化ではなくゴミだと思うがとりあえず。
41: memset(&ram[0], 0, ramsize);
42: }
43: }
44:
45: // アドレスデコーダ
46: inline uint64
47: SubRAMBaseDevice::Decoder(uint32 addr) const
48: {
49: // たぶん 128KB というかサイズ分で折り返しイメージが見えるはず。要確認。
50: return addr % ramsize;
51: }
52:
53: uint64
54: SubRAMBaseDevice::Read8(uint32 addr)
55: {
56: uint32 offset = Decoder(addr);
57: uint32 data = ram[offset];
58: putlog(4, "$%08x.B -> $%02x", addr, data);
59: return data;
60: }
61:
62: uint64
63: SubRAMBaseDevice::Read16(uint32 addr)
64: {
65: uint32 offset = Decoder(addr);
66: uint32 data;
67: data = (uint32)ram[offset + 0] << 8;
68: data |= (uint32)ram[offset + 1];
69: putlog(4, "$%08x.W -> $%04x", addr, data);
70: return data;
71: }
72:
73: uint64
74: SubRAMBaseDevice::Read32(uint32 addr)
75: {
76: uint32 offset = Decoder(addr);
77: uint32 data;
78: data = (uint32)ram[offset + 0] << 24;
79: data |= (uint32)ram[offset + 1] << 16;
80: data |= (uint32)ram[offset + 2] << 8;
81: data |= (uint32)ram[offset + 3];
82: putlog(4, "$%08x.L -> $%08x", addr, data);
83: return data;
84: }
85:
86: uint64
87: SubRAMBaseDevice::Write8(uint32 addr, uint32 data)
88: {
89: putlog(3, "$%08x.B <- $%02x", addr, data);
90:
91: uint32 offset = Decoder(addr);
92: ram[offset] = data;
93: return 0;
94: }
95:
96: uint64
97: SubRAMBaseDevice::Write16(uint32 addr, uint32 data)
98: {
99: putlog(3, "$%08x.W <- $%04x", addr, data);
100:
101: uint32 offset = Decoder(addr);
102: ram[offset + 0] = (data >> 8) & 0xff;
103: ram[offset + 1] = data & 0xff;
104: return 0;
105: }
106:
107: uint64
108: SubRAMBaseDevice::Write32(uint32 addr, uint32 data)
109: {
110: putlog(3, "$%08x.L <- $%08x", addr, data);
111:
112: uint32 offset = Decoder(addr);
113: ram[offset + 0] = data >> 24;
114: ram[offset + 1] = (data >> 16) & 0xff;
115: ram[offset + 2] = (data >> 8) & 0xff;
116: ram[offset + 3] = data & 0xff;
117: return 0;
118: }
119:
120: uint64
121: SubRAMBaseDevice::Peek8(uint32 addr)
122: {
123: uint32 offset = Decoder(addr);
124: return ram[offset];
125: }
126:
127: uint64
128: SubRAMBaseDevice::Poke8(uint32 addr, uint32 data)
129: {
130: if ((int32)data >= 0) {
131: uint32 offset = Decoder(addr);
132: ram[offset] = data;
133: }
134: return 0;
135: }
136:
137:
138: //
139: // サブメモリ 1
140: //
141:
142: // コンストラクタ
143: SubRAMDevice::SubRAMDevice(int ramsize_kb)
144: : inherited(OBJ_SUBRAM, ramsize_kb)
145: {
146: }
147:
148: // デストラクタ
149: SubRAMDevice::~SubRAMDevice()
150: {
151: }
152:
153: // リセット
154: void
155: SubRAMDevice::ResetHard(bool poweron)
156: {
157: // 通常モードなら電源オンで初期化。
158: // MSXDOS モードなら MSXDOSDevice::Init() がすでにここに
159: // 書き込んでいるため、消してはいけない。
160: if (gMainApp.msxdos_mode == false) {
161: inherited::ResetHard(poweron);
162: }
163: }
164:
165:
166: //
167: // サブメモリ 2
168: //
169:
170: // コンストラクタ
171: SubRAM2Device::SubRAM2Device(int ramsize_kb)
172: : inherited(OBJ_SUBRAM2, ramsize_kb)
173: {
174: }
175:
176: // デストラクタ
177: SubRAM2Device::~SubRAM2Device()
178: {
179: }
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