c8d1e9b6 |
1 | #include "pico_int.h" |
2 | #include "sound/sn76496.h" |
3 | |
4 | #define Z80_MEM_SHIFT 13 |
5 | |
6 | unsigned long z80_read_map [0x10000 >> Z80_MEM_SHIFT]; |
7 | unsigned long z80_write_map[0x10000 >> Z80_MEM_SHIFT]; |
8 | |
9 | void MEMH_FUNC z80_map_set(unsigned long *map, int start_addr, int end_addr, |
10 | void *func_or_mh, int is_func) |
11 | { |
12 | unsigned long addr = (unsigned long)func_or_mh; |
13 | int mask = (1 << Z80_MEM_SHIFT) - 1; |
14 | int i; |
15 | |
16 | if ((start_addr & mask) != 0 || (end_addr & mask) != mask) |
17 | elprintf(EL_STATUS|EL_ANOMALY, "z80_map_set: tried to map bad range: %04x-%04x", |
18 | start_addr, end_addr); |
19 | |
20 | if (addr & 1) { |
21 | elprintf(EL_STATUS|EL_ANOMALY, "z80_map_set: ptr is not aligned: %08lx", addr); |
22 | return; |
23 | } |
24 | |
25 | for (i = start_addr >> Z80_MEM_SHIFT; i <= end_addr >> Z80_MEM_SHIFT; i++) |
26 | if (is_func) |
27 | map[i] = (addr >> 1) | (1 << (sizeof(addr) * 8 - 1)); |
28 | else |
29 | map[i] = (addr - (i << Z80_MEM_SHIFT)) >> 1; |
30 | } |
31 | |
32 | #ifdef _USE_MZ80 |
33 | |
34 | // memhandlers for mz80 core |
35 | unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); } |
36 | void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); } |
37 | |
38 | // structures for mz80 core |
39 | static struct MemoryReadByte mz80_mem_read[]= |
40 | { |
41 | {0x0000,0xffff,mz80_read}, |
42 | {(UINT32) -1,(UINT32) -1,NULL} |
43 | }; |
44 | static struct MemoryWriteByte mz80_mem_write[]= |
45 | { |
46 | {0x0000,0xffff,mz80_write}, |
47 | {(UINT32) -1,(UINT32) -1,NULL} |
48 | }; |
49 | static struct z80PortRead mz80_io_read[] ={ |
50 | {(UINT16) -1,(UINT16) -1,NULL} |
51 | }; |
52 | static struct z80PortWrite mz80_io_write[]={ |
53 | {(UINT16) -1,(UINT16) -1,NULL} |
54 | }; |
55 | |
56 | int mz80_run(int cycles) |
57 | { |
58 | int ticks_pre = mz80GetElapsedTicks(0); |
59 | mz80exec(cycles); |
60 | return mz80GetElapsedTicks(0) - ticks_pre; |
61 | } |
62 | |
63 | #endif |
64 | |
65 | #ifdef _USE_DRZ80 |
66 | |
67 | struct DrZ80 drZ80; |
68 | |
69 | static unsigned int DrZ80_rebasePC(unsigned short a) |
70 | { |
71 | drZ80.Z80PC_BASE = (unsigned int) Pico.zram; |
72 | return drZ80.Z80PC_BASE + a; |
73 | } |
74 | |
75 | static unsigned int DrZ80_rebaseSP(unsigned short a) |
76 | { |
77 | drZ80.Z80SP_BASE = (unsigned int) Pico.zram; |
78 | return drZ80.Z80SP_BASE + a; |
79 | } |
80 | #endif |
81 | |
82 | |
83 | PICO_INTERNAL void z80_init(void) |
84 | { |
85 | #ifdef _USE_MZ80 |
86 | struct mz80context z80; |
87 | |
88 | // z80 |
89 | mz80init(); |
90 | // Modify the default context |
91 | mz80GetContext(&z80); |
92 | |
93 | // point mz80 stuff |
94 | z80.z80Base=Pico.zram; |
95 | z80.z80MemRead=mz80_mem_read; |
96 | z80.z80MemWrite=mz80_mem_write; |
97 | z80.z80IoRead=mz80_io_read; |
98 | z80.z80IoWrite=mz80_io_write; |
99 | |
100 | mz80SetContext(&z80); |
101 | #endif |
102 | #ifdef _USE_DRZ80 |
103 | memset(&drZ80, 0, sizeof(drZ80)); |
104 | drZ80.z80_rebasePC=DrZ80_rebasePC; |
105 | drZ80.z80_rebaseSP=DrZ80_rebaseSP; |
106 | drZ80.z80_read8 =(void *)z80_read_map; |
107 | drZ80.z80_read16 =NULL; |
108 | drZ80.z80_write8 =(void *)z80_write_map; |
109 | drZ80.z80_write16 =NULL; |
110 | drZ80.z80_irq_callback=NULL; |
111 | #endif |
112 | #ifdef _USE_CZ80 |
113 | memset(&CZ80, 0, sizeof(CZ80)); |
114 | Cz80_Init(&CZ80); |
115 | Cz80_Set_ReadB(&CZ80, NULL); // unused (hacked in) |
116 | Cz80_Set_WriteB(&CZ80, NULL); |
117 | #endif |
118 | } |
119 | |
120 | PICO_INTERNAL void z80_reset(void) |
121 | { |
122 | #ifdef _USE_MZ80 |
123 | mz80reset(); |
124 | #endif |
125 | #ifdef _USE_DRZ80 |
126 | memset(&drZ80, 0, 0x54); |
127 | drZ80.Z80F = (1<<2); // set ZFlag |
128 | drZ80.Z80F2 = (1<<2); // set ZFlag |
129 | drZ80.Z80IX = 0xFFFF << 16; |
130 | drZ80.Z80IY = 0xFFFF << 16; |
131 | drZ80.Z80IM = 0; // 1? |
132 | drZ80.z80irqvector = 0xff0000; // RST 38h |
133 | drZ80.Z80PC = drZ80.z80_rebasePC(0); |
134 | drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ? |
135 | #endif |
136 | #ifdef _USE_CZ80 |
137 | Cz80_Reset(&CZ80); |
138 | Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff); |
139 | Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff); |
140 | Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000); |
141 | #endif |
142 | Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled |
143 | } |
144 | |
145 | PICO_INTERNAL void z80_pack(unsigned char *data) |
146 | { |
147 | #if defined(_USE_MZ80) |
148 | struct mz80context mz80; |
149 | *(int *)data = 0x00005A6D; // "mZ" |
150 | mz80GetContext(&mz80); |
151 | memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers |
152 | #elif defined(_USE_DRZ80) |
153 | *(int *)data = 0x015A7244; // "DrZ" v1 |
154 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE); |
155 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE); |
156 | memcpy(data+4, &drZ80, 0x54); |
157 | #elif defined(_USE_CZ80) |
158 | *(int *)data = 0x00007a43; // "Cz" |
159 | *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC); |
160 | memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80); |
161 | #endif |
162 | } |
163 | |
164 | PICO_INTERNAL void z80_unpack(unsigned char *data) |
165 | { |
166 | #if defined(_USE_MZ80) |
167 | if (*(int *)data == 0x00005A6D) { // "mZ" save? |
168 | struct mz80context mz80; |
169 | mz80GetContext(&mz80); |
170 | memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4); |
171 | mz80SetContext(&mz80); |
172 | } else { |
173 | z80_reset(); |
174 | z80_int(); |
175 | } |
176 | #elif defined(_USE_DRZ80) |
177 | if (*(int *)data == 0x015A7244) { // "DrZ" v1 save? |
178 | memcpy(&drZ80, data+4, 0x54); |
179 | // update bases |
180 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE); |
181 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE); |
182 | } else { |
183 | z80_reset(); |
184 | drZ80.Z80IM = 1; |
185 | z80_int(); // try to goto int handler, maybe we won't execute trash there? |
186 | } |
187 | #elif defined(_USE_CZ80) |
188 | if (*(int *)data == 0x00007a43) { // "Cz" save? |
189 | memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80); |
190 | Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4)); |
191 | } else { |
192 | z80_reset(); |
193 | z80_int(); |
194 | } |
195 | #endif |
196 | } |
197 | |
198 | PICO_INTERNAL void z80_exit(void) |
199 | { |
200 | #if defined(_USE_MZ80) |
201 | mz80shutdown(); |
202 | #endif |
203 | } |
204 | |
205 | PICO_INTERNAL void z80_debug(char *dstr) |
206 | { |
207 | #if defined(_USE_DRZ80) |
208 | sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE); |
209 | #elif defined(_USE_CZ80) |
210 | sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W); |
211 | #endif |
212 | } |