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);
26 addr -= (start_addr >> Z80_MEM_SHIFT) << Z80_MEM_SHIFT;
28 for (i = start_addr >> Z80_MEM_SHIFT; i <= end_addr >> Z80_MEM_SHIFT; i++) {
31 map[i] |= 1 << (sizeof(addr) * 8 - 1);
37 // memhandlers for mz80 core
38 unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
39 void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
41 // structures for mz80 core
42 static struct MemoryReadByte mz80_mem_read[]=
44 {0x0000,0xffff,mz80_read},
45 {(UINT32) -1,(UINT32) -1,NULL}
47 static struct MemoryWriteByte mz80_mem_write[]=
49 {0x0000,0xffff,mz80_write},
50 {(UINT32) -1,(UINT32) -1,NULL}
52 static struct z80PortRead mz80_io_read[] ={
53 {(UINT16) -1,(UINT16) -1,NULL}
55 static struct z80PortWrite mz80_io_write[]={
56 {(UINT16) -1,(UINT16) -1,NULL}
59 int mz80_run(int cycles)
61 int ticks_pre = mz80GetElapsedTicks(0);
63 return mz80GetElapsedTicks(0) - ticks_pre;
73 PICO_INTERNAL void z80_init(void)
76 struct mz80context z80;
80 // Modify the default context
84 z80.z80Base=Pico.zram;
85 z80.z80MemRead=mz80_mem_read;
86 z80.z80MemWrite=mz80_mem_write;
87 z80.z80IoRead=mz80_io_read;
88 z80.z80IoWrite=mz80_io_write;
93 memset(&drZ80, 0, sizeof(drZ80));
94 drZ80.z80_rebasePC=NULL; // unused, handled by xmap
95 drZ80.z80_rebaseSP=NULL;
96 drZ80.z80_read8 =(void *)z80_read_map;
97 drZ80.z80_read16 =NULL;
98 drZ80.z80_write8 =(void *)z80_write_map;
99 drZ80.z80_write16 =NULL;
100 drZ80.z80_irq_callback=NULL;
103 memset(&CZ80, 0, sizeof(CZ80));
105 Cz80_Set_ReadB(&CZ80, NULL); // unused (hacked in)
106 Cz80_Set_WriteB(&CZ80, NULL);
110 PICO_INTERNAL void z80_reset(void)
116 memset(&drZ80, 0, 0x54);
117 drZ80.Z80F = (1<<2); // set ZFlag
118 drZ80.Z80F2 = (1<<2); // set ZFlag
119 drZ80.Z80IX = 0xFFFF << 16;
120 drZ80.Z80IY = 0xFFFF << 16;
121 drZ80.Z80IM = 0; // 1?
122 drZ80.z80irqvector = 0xff0000; // RST 38h
123 drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0] << 1;
124 // drZ80 is locked in single bank
125 drZ80.Z80SP_BASE = ((PicoAHW & PAHW_SMS) ?
126 z80_read_map[0xc000 >> Z80_MEM_SHIFT] : z80_read_map[0]) << 1;
127 // drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
131 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
132 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
133 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
135 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
138 // XXX TODO: should better use universal z80 save format
139 PICO_INTERNAL void z80_pack(unsigned char *data)
141 #if defined(_USE_MZ80)
142 struct mz80context mz80;
143 *(int *)data = 0x00005A6D; // "mZ"
144 mz80GetContext(&mz80);
145 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
146 #elif defined(_USE_DRZ80)
147 *(int *)data = 0x015A7244; // "DrZ" v1
148 // drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
149 // drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
150 memcpy(data+4, &drZ80, 0x54);
151 #elif defined(_USE_CZ80)
152 *(int *)data = 0x00007a43; // "Cz"
153 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
154 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
158 PICO_INTERNAL void z80_unpack(unsigned char *data)
160 #if defined(_USE_MZ80)
161 if (*(int *)data == 0x00005A6D) { // "mZ" save?
162 struct mz80context mz80;
163 mz80GetContext(&mz80);
164 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
165 mz80SetContext(&mz80);
170 #elif defined(_USE_DRZ80)
171 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
173 memcpy(&drZ80, data+4, 0x54);
174 pc = (drZ80.Z80PC - drZ80.Z80PC_BASE) & 0xffff;
175 sp = (drZ80.Z80SP - drZ80.Z80SP_BASE) & 0xffff;
177 drZ80.Z80PC_BASE = z80_read_map[pc >> Z80_MEM_SHIFT];
178 if (drZ80.Z80PC & (1<<31)) {
179 elprintf(EL_STATUS|EL_ANOMALY, "bad PC in z80 save: %04x", pc);
180 drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0];
182 drZ80.Z80PC_BASE <<= 1;
183 drZ80.Z80PC = drZ80.Z80PC_BASE + pc;
185 drZ80.Z80SP_BASE = z80_read_map[sp >> Z80_MEM_SHIFT];
186 if (drZ80.Z80SP & (1<<31)) {
187 elprintf(EL_STATUS|EL_ANOMALY, "bad SP in z80 save: %04x", sp);
188 drZ80.Z80SP_BASE = z80_read_map[0];
189 drZ80.Z80SP = drZ80.Z80SP_BASE + (1 << Z80_MEM_SHIFT);
191 drZ80.Z80SP_BASE <<= 1;
192 drZ80.Z80SP = drZ80.Z80SP_BASE + sp;
197 z80_int(); // try to goto int handler, maybe we won't execute trash there?
199 #elif defined(_USE_CZ80)
200 if (*(int *)data == 0x00007a43) { // "Cz" save?
201 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
202 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
210 PICO_INTERNAL void z80_exit(void)
212 #if defined(_USE_MZ80)
217 PICO_INTERNAL void z80_debug(char *dstr)
219 #if defined(_USE_DRZ80)
220 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
221 #elif defined(_USE_CZ80)
222 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);