2 #include "sound/sn76496.h"
4 #define Z80_MEM_SHIFT 13
6 unsigned long z80_read_map [0x10000 >> Z80_MEM_SHIFT];
7 unsigned long z80_write_map[0x10000 >> Z80_MEM_SHIFT];
9 void MEMH_FUNC z80_map_set(unsigned long *map, int start_addr, int end_addr,
10 void *func_or_mh, int is_func)
12 unsigned long addr = (unsigned long)func_or_mh;
13 int mask = (1 << Z80_MEM_SHIFT) - 1;
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);
21 elprintf(EL_STATUS|EL_ANOMALY, "z80_map_set: ptr is not aligned: %08lx", addr);
25 for (i = start_addr >> Z80_MEM_SHIFT; i <= end_addr >> Z80_MEM_SHIFT; i++)
27 map[i] = (addr >> 1) | (1 << (sizeof(addr) * 8 - 1));
29 map[i] = (addr - (i << Z80_MEM_SHIFT)) >> 1;
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); }
38 // structures for mz80 core
39 static struct MemoryReadByte mz80_mem_read[]=
41 {0x0000,0xffff,mz80_read},
42 {(UINT32) -1,(UINT32) -1,NULL}
44 static struct MemoryWriteByte mz80_mem_write[]=
46 {0x0000,0xffff,mz80_write},
47 {(UINT32) -1,(UINT32) -1,NULL}
49 static struct z80PortRead mz80_io_read[] ={
50 {(UINT16) -1,(UINT16) -1,NULL}
52 static struct z80PortWrite mz80_io_write[]={
53 {(UINT16) -1,(UINT16) -1,NULL}
56 int mz80_run(int cycles)
58 int ticks_pre = mz80GetElapsedTicks(0);
60 return mz80GetElapsedTicks(0) - ticks_pre;
70 PICO_INTERNAL void z80_init(void)
73 struct mz80context z80;
77 // Modify the default context
81 z80.z80Base=Pico.zram;
82 z80.z80MemRead=mz80_mem_read;
83 z80.z80MemWrite=mz80_mem_write;
84 z80.z80IoRead=mz80_io_read;
85 z80.z80IoWrite=mz80_io_write;
90 memset(&drZ80, 0, sizeof(drZ80));
91 drZ80.z80_rebasePC=NULL; // unused, handled by xmap
92 drZ80.z80_rebaseSP=NULL;
93 drZ80.z80_read8 =(void *)z80_read_map;
94 drZ80.z80_read16 =NULL;
95 drZ80.z80_write8 =(void *)z80_write_map;
96 drZ80.z80_write16 =NULL;
97 drZ80.z80_irq_callback=NULL;
100 memset(&CZ80, 0, sizeof(CZ80));
102 Cz80_Set_ReadB(&CZ80, NULL); // unused (hacked in)
103 Cz80_Set_WriteB(&CZ80, NULL);
107 PICO_INTERNAL void z80_reset(void)
113 memset(&drZ80, 0, 0x54);
114 drZ80.Z80F = (1<<2); // set ZFlag
115 drZ80.Z80F2 = (1<<2); // set ZFlag
116 drZ80.Z80IX = 0xFFFF << 16;
117 drZ80.Z80IY = 0xFFFF << 16;
118 drZ80.Z80IM = 0; // 1?
119 drZ80.z80irqvector = 0xff0000; // RST 38h
120 drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0] << 1;
121 // drZ80 is locked in single bank
122 drZ80.Z80SP_BASE = z80_read_map[0] << 1;
123 // drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
127 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
128 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
129 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
131 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
134 // XXX TODO: should better use universal z80 save format
135 PICO_INTERNAL void z80_pack(unsigned char *data)
137 #if defined(_USE_MZ80)
138 struct mz80context mz80;
139 *(int *)data = 0x00005A6D; // "mZ"
140 mz80GetContext(&mz80);
141 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
142 #elif defined(_USE_DRZ80)
143 *(int *)data = 0x015A7244; // "DrZ" v1
144 // drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
145 // drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
146 memcpy(data+4, &drZ80, 0x54);
147 #elif defined(_USE_CZ80)
148 *(int *)data = 0x00007a43; // "Cz"
149 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
150 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
154 PICO_INTERNAL void z80_unpack(unsigned char *data)
156 #if defined(_USE_MZ80)
157 if (*(int *)data == 0x00005A6D) { // "mZ" save?
158 struct mz80context mz80;
159 mz80GetContext(&mz80);
160 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
161 mz80SetContext(&mz80);
166 #elif defined(_USE_DRZ80)
167 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
169 memcpy(&drZ80, data+4, 0x54);
170 pc = (drZ80.Z80PC - drZ80.Z80PC_BASE) & 0xffff;
171 sp = (drZ80.Z80SP - drZ80.Z80SP_BASE) & 0xffff;
173 drZ80.Z80PC_BASE = z80_read_map[pc >> Z80_MEM_SHIFT];
174 if (drZ80.Z80PC & (1<<31)) {
175 elprintf(EL_STATUS|EL_ANOMALY, "bad PC in z80 save: %04x", pc);
176 drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0];
178 drZ80.Z80PC_BASE <<= 1;
179 drZ80.Z80PC = drZ80.Z80PC_BASE + pc;
181 drZ80.Z80SP_BASE = z80_read_map[sp >> Z80_MEM_SHIFT];
182 if (drZ80.Z80SP & (1<<31)) {
183 elprintf(EL_STATUS|EL_ANOMALY, "bad SP in z80 save: %04x", sp);
184 drZ80.Z80SP_BASE = z80_read_map[0];
185 drZ80.Z80SP = drZ80.Z80SP_BASE + (1 << Z80_MEM_SHIFT);
187 drZ80.Z80SP_BASE <<= 1;
188 drZ80.Z80SP = drZ80.Z80SP_BASE + sp;
193 z80_int(); // try to goto int handler, maybe we won't execute trash there?
195 #elif defined(_USE_CZ80)
196 if (*(int *)data == 0x00007a43) { // "Cz" save?
197 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
198 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
206 PICO_INTERNAL void z80_exit(void)
208 #if defined(_USE_MZ80)
213 PICO_INTERNAL void z80_debug(char *dstr)
215 #if defined(_USE_DRZ80)
216 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
217 #elif defined(_USE_CZ80)
218 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);