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1.1 root 1: //
2: // nono
3: // Copyright (C) 2023 nono project
4: // Licensed under nono-license.txt
5: //
6:
7: //
8: // X68030 勝手に拡張メモリ
9: //
10: // 拡張メモリは TS-6BE16 互換か 060turbo 互換のいずれか。
11: // TS-6BE16 互換だと $0100'0000 〜 $01ff'ffff の 16MB。
12: // 060turbo 互換だと $1000'0000 〜 $17ff'ffff の 128MB、
13: // $1000'0000 〜 $1fff'ffff の 256MB。
14: //
15:
16: // 拡張 RAM はロングワード単位でホストバイトオーダ配置なので、
17: // バイトアクセス、ワードアクセス時は HLB(), HLW() マクロを使用のこと。
18:
19: #include "extram.h"
20: #include "config.h"
21:
22: // コンストラクタ
23: ExtRAMDevice::ExtRAMDevice()
24: : inherited(OBJ_EXTRAM)
25: {
26: }
27:
28: // デストラクタ
29: ExtRAMDevice::~ExtRAMDevice()
30: {
31: }
32:
33: // 初期化
34: bool
35: ExtRAMDevice::Init()
36: {
37: if (inherited::Init() == false) {
38: return false;
39: }
40:
41: const ConfigItem& item = gConfig->Find("extram-size");
42: uint32 extram_size_MB = item.AsInt();
43: if (extram_size_MB <= 0) {
44: return true;
45: }
46: switch (extram_size_MB) {
47: case 16:
48: ram_addr = 0x01'000000;
49: break;
50: case 128:
51: case 256:
52: ram_addr = 0x10'000000;
53: break;
54: default:
1.1.1.2 ! root 55: item.Err("Valid size is 16, 128, or 256 for now");
1.1 root 56: return false;
57: }
58:
59: ram_size = extram_size_MB * 1024 * 1024;
60: ram.reset(new uint8[ram_size]);
61:
62: return true;
63: }
64:
65: // 電源オン/リセット
66: void
67: ExtRAMDevice::ResetHard(bool poweron)
68: {
69: if (poweron) {
70: // ノイズで埋めたいがとりあえず。
71: memset(&ram[0], 0, ram_size);
72: }
73: }
74:
75: inline uint32
76: ExtRAMDevice::Decoder(uint32 addr) const
77: {
78: return (addr - ram_addr);
79: }
80:
81: uint64
82: ExtRAMDevice::Read8(uint32 addr)
83: {
84: uint32 offset = Decoder(addr);
85: uint32 data = ram[HLB(offset)];
86: putlog(4, "$%08x.B -> $%02x", addr, data);
87: return data;
88: }
89:
90: uint64
91: ExtRAMDevice::Read16(uint32 addr)
92: {
93: uint32 offset = Decoder(addr);
94: uint32 data = *(uint16 *)&ram[HLW(offset)];
95: putlog(4, "$%08x.W -> $%04x", addr, data);
96: return data;
97: }
98:
99: uint64
100: ExtRAMDevice::Read32(uint32 addr)
101: {
102: uint32 offset = Decoder(addr);
103: uint32 data = *(uint32 *)&ram[offset];
104: putlog(4, "$%08x.L -> $%08x", addr, data);
105: return data;
106: }
107:
108: uint64
109: ExtRAMDevice::Write8(uint32 addr, uint32 data)
110: {
111: uint32 offset = Decoder(addr);
112: ram[HLB(offset)] = data;
113: putlog(3, "$%08x.B <- $%02x", addr, data);
114: return 0;
115: }
116:
117: uint64
118: ExtRAMDevice::Write16(uint32 addr, uint32 data)
119: {
120: uint32 offset = Decoder(addr);
121: *(uint16 *)&ram[HLW(offset)] = data;
122: putlog(3, "$%08x.W <- $%04x", addr, data);
123: return 0;
124: }
125:
126: uint64
127: ExtRAMDevice::Write32(uint32 addr, uint32 data)
128: {
129: uint32 offset = Decoder(addr);
130: *(uint32 *)&ram[offset] = data;
131: putlog(3, "$%08x.L <- $%08x", addr, data);
132: return 0;
133: }
134:
135: uint64
136: ExtRAMDevice::Peek8(uint32 addr)
137: {
138: uint32 offset = Decoder(addr);
139: return ram[HLB(offset)];
140: }
141:
142: uint64
143: ExtRAMDevice::Poke8(uint32 addr, uint32 data)
144: {
145: if ((int32)data >= 0) {
146: uint32 offset = Decoder(addr);
147: ram[HLB(offset)] = data;
148: }
149: return 0;
150: }
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