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;
69 static unsigned int DrZ80_rebasePC(unsigned short a)
71 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
72 return drZ80.Z80PC_BASE + a;
75 static unsigned int DrZ80_rebaseSP(unsigned short a)
77 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
78 return drZ80.Z80SP_BASE + a;
83 PICO_INTERNAL void z80_init(void)
86 struct mz80context z80;
90 // Modify the default context
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;
100 mz80SetContext(&z80);
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;
113 memset(&CZ80, 0, sizeof(CZ80));
115 Cz80_Set_ReadB(&CZ80, NULL); // unused (hacked in)
116 Cz80_Set_WriteB(&CZ80, NULL);
120 PICO_INTERNAL void z80_reset(void)
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 ?
138 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
139 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
140 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
142 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
145 PICO_INTERNAL void z80_pack(unsigned char *data)
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);
164 PICO_INTERNAL void z80_unpack(unsigned char *data)
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);
176 #elif defined(_USE_DRZ80)
177 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
178 memcpy(&drZ80, data+4, 0x54);
180 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
181 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
185 z80_int(); // try to goto int handler, maybe we won't execute trash there?
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));
198 PICO_INTERNAL void z80_exit(void)
200 #if defined(_USE_MZ80)
205 PICO_INTERNAL void z80_debug(char *dstr)
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);