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Up to [Isaki's NoNo m68k/m88k emulator] / nono / m680x0|
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1.1 root 1: //
2: // nono
3: // Copyright (C) 2024 nono project
4: // Licensed under nono-license.txt
5: //
6:
7: #pragma once
8:
9: struct m68040MMU
10: {
11: // 3 2 1 0
12: // 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
13: // +-------------------------------------+-+-+-+---+-+---+-+-+-+---+
14: // | Physical Address (4K/8K) : | |G|U10|S|CM |M|U|W|PDT|
15: // +-------------------------------------+-+-+-+---+-+---+-+-+-+---+
16: // ^ ^
17: // | |
18: // +-+-- UR (ユーザ用予約)
19: static const uint32 DESC_G = 0x00000400;
20: static const uint32 DESC_S = 0x00000080;
21: static const uint32 DESC_CM = 0x00000060;
22: static const uint32 DESC_M = 0x00000010;
23: static const uint32 DESC_U = 0x00000008;
24: static const uint32 DESC_W = 0x00000004;
25: static const uint32 DESC_DT = 0x00000003;
26:
27: // PDT は
28: // %00 無効
29: // %01 常駐
30: // %10 間接
31: // %11 常駐
32: static const uint32 PDT_INVALID = 0;
33: static const uint32 PDT_INDIRECT = 2;
34:
35: // UDT は
36: // %00 無効
37: // %01 無効
38: // %10 常駐
39: // %11 常駐
40: };
41:
42: class m68040RP
43: {
44: // SRP, URP
45: //
46: // 3 2 1 0
47: // 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
48: // +-------------------------------------------+-------------------+
49: // | Root Pointer | 0 |
50: // +-------------------------------------------+-------------------+
51:
52: public:
53: static const uint32 ADDR_MASK = 0xfffffc00;
54: };
55:
56: class m68040TT
57: {
58: // 3 2 1 0
59: // 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
60: // +---------------+---------------+-+-+-+-+-+-+---+-+-+-+-+-+-+-+-+
61: // |LogicalAddrBase|LogicalAddrMask|E| S | | U | |CM | |W| |
62: // +---------------+---------------+-+-+-+-+-+-+---+-+-+-+-+-+-+-+-+
63:
64: public:
65: static const uint32 MASK = 0xffffe364;
66: static const uint32 LBASE_MASK = 0xff000000;
67: static const uint32 LMASK_MASK = 0x00ff0000;
68: static const uint32 E = 0x00008000;
69: static const uint32 S_IGN = 0x00004000;
70: static const uint32 S_FC2 = 0x00002000;
71: static const uint32 U_MASK = 0x00000300;
72: static const uint32 U1 = 0x00000200;
73: static const uint32 U0 = 0x00000100;
74: static const uint32 CM = 0x00000060;
75: static const uint32 W = 0x00000004;
76:
77: m68040TT(const char *, uint32 *);
78: ~m68040TT();
79:
80: bool Match(busaddr addr) const;
81: const char *GetName() const { return name; }
82:
83: uint32 base {};
84: uint32 mask {};
85: bool e {};
86: bool s_ign {};
87: bool s_fc2 {};
88: uint32 u {};
89: uint8 cm {};
90: bool w {};
91:
92: uint32 *reg {}; // レジスタイメージ置き場 (®.*tt)
93: private:
94: const char *name {}; // 表示用のレジスタ名
95: };
96:
97: class m68040TC
98: {
99: // 1 0
100: // 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
101: // +-+-+---------------------------+
102: // |E|P| reserved |
103: // +-+-+---------------------------+
104:
105: public:
106: static const uint16 MASK = 0xc000;
107: static const uint16 E = 0x8000; // 有効
108: static const uint16 P = 0x4000; // ページサイズ(%1=8K)
109:
110: bool e {};
111: bool ps4k {}; // ページサイズが 4K なら true (ビット定義と逆)
112: uint32 table_mask {}; // ページテーブルアドレスのマスク
113: uint32 tic_shift {}; // 論理アドレス TIC 部の右シフト量
114: uint32 tic_mask {}; // 論理アドレス TIC 部のマスク
115: uint32 page_mask {}; // ページディスクリプタの物理アドレスマスク
116: };
117:
118: class m68040MMUSR
119: {
120: // 3 2 1 0
121: // 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
122: // +---------------------------------------+-+-+---+-+-+-+-+-+-+-+-+
123: // | Physical Address |B|G| U |S|CM |M| |W|T|R|
124: // +---------------------------------------+-+-+---+-+-+-+-+-+-+-+-+
125:
126: public:
127: static const uint32 ADDR_MASK = 0xfffff000; // 物理アドレス
128: static const uint32 B = 0x00000800; // バスエラー
129: static const uint32 G = 0x00000400; // グローバル
130: static const uint32 U_MASK = 0x00000300; // ユーザ領域
131: static const uint32 U1 = 0x00000200;
132: static const uint32 U0 = 0x00000100;
133: static const uint32 S = 0x00000080; // スーパーバイザ保護
134: static const uint32 CM = 0x00000060; // キャッシュモード
135: static const uint32 M = 0x00000010; // 修正済み
136: static const uint32 W = 0x00000004; // 書き込み保護
137: static const uint32 T = 0x00000002; // 透過変換がヒット
138: static const uint32 R = 0x00000001; // 常駐
139: };
140:
141: // ATC エントリ
142: class m68040ATCEntry
143: {
144: public:
145: // タグは無効なら最下位ビットを立てる。これでマッチしなくなる。
146: //
147: // 3 2 1 0
148: // 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
149: // +-----+-+---------------------------------------+-------------+--+
150: // | 0 |S| Logical Address (4K/8K) : | 0 |~V|
151: // +-----+-+---------------------------------------+-------------+--+
152: static const uint32 SUPER = 0x10000000;
153: static const uint32 INVALID = 0x00000001;
154: uint32 tag {};
155:
156: bool IsValid() const { return (tag & INVALID) == 0; }
157: bool IsSuper() const { return (tag & SUPER) != 0; }
158: void Invalidate() { tag |= INVALID; }
159:
160: // desc はページディスクリプタをそのまま持っておく。
161: // ページディスクリプタなので PDT(下位2bit) は %01 か %11 なら Resident。
162: //
163: // 3 2 1 0
164: // 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
165: // +-----------------------------------------+-+---+-+---+-+-+-+-+-+
166: // | (not used) |G|U10|S|CM |M|U|W|-|R|
167: // +-----------------------------------------+-+---+-+---+-+-+-+-+-+
168: uint32 paddr {};
169: uint32 desc {};
170:
171: bool IsGlobal() const { return (desc & m68040MMU::DESC_G); }
172: bool IsSuperProtected() const { return (desc & m68040MMU::DESC_S); }
173: bool IsWriteProtected() const { return (desc & m68040MMU::DESC_W); }
174: bool IsResident() const { return (desc & 0x0001); }
175:
176: bool MatchStatus(busaddr laddr) const;
177: };
178:
179: // ATC セット
180: class m68040ATCSet
181: {
182: public:
183: std::array<m68040ATCEntry, 4> entry {};
184: uint LRU {};
185:
186: int GetEntry() const;
187: };
188:
189: // ATC
190: class m68040ATC
191: {
192: public:
193: std::array<m68040ATCSet, 16> sets {};
194:
195: // アドレス (busaddr >> 4) からタグを作る際のマスク。
196: // PS が 4K か 8K かで長さが違うため。
197: uint32 tag_mask {};
198:
199: void Flush(bool s, bool global);
200: void Flush(busaddr addr, bool global);
201: };
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