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[picodrive.git] / Pico / Sek.c
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1// This is part of Pico Library\r
2\r
3// (c) Copyright 2004 Dave, All rights reserved.\r
4// (c) Copyright 2006 notaz, All rights reserved.\r
5// Free for non-commercial use.\r
6\r
7// For commercial use, separate licencing terms must be obtained.\r
8\r
9\r
10#include "PicoInt.h"\r
11\r
12\r
13int SekCycleCnt=0; // cycles done in this frame\r
14int SekCycleAim=0; // cycle aim\r
15unsigned int SekCycleCntT=0;\r
16\r
17#ifdef EMU_C68K\r
18// ---------------------- Cyclone 68000 ----------------------\r
19struct Cyclone PicoCpu;\r
20#endif\r
21\r
22#ifdef EMU_M68K\r
23// ---------------------- MUSASHI 68000 ----------------------\r
24m68ki_cpu_core PicoM68kCPU; // MD's CPU\r
25#endif\r
26\r
27#ifdef EMU_A68K\r
28// ---------------------- A68K ----------------------\r
29\r
30void __cdecl M68000_RESET();\r
31int m68k_ICount=0;\r
32unsigned int mem_amask=0xffffff; // 24-bit bus\r
33unsigned int mame_debug=0,cur_mrhard=0,m68k_illegal_opcode=0,illegal_op=0,illegal_pc=0,opcode_entry=0; // filler\r
34\r
35static int IrqCallback(int i) { i; return -1; }\r
36static int DoReset() { return 0; }\r
37static int (*ResetCallback)()=DoReset;\r
38\r
39#pragma warning (disable:4152)\r
40#endif\r
41\r
42\r
43\r
44// interrupt acknowledgment\r
45#ifdef EMU_C68K\r
46static void SekIntAck(int level)\r
47{\r
48 // try to emulate VDP's reaction to 68000 int ack\r
49 if (level == 4) Pico.video.pending_ints = 0;\r
50 else if(level == 6) Pico.video.pending_ints &= ~0x20;\r
51 PicoCpu.irq = 0;\r
52}\r
53\r
54static void SekResetAck()\r
55{\r
56#if defined(__DEBUG_PRINT) || defined(WIN32)\r
57 dprintf("Reset encountered @ %06x", SekPc);\r
58#endif\r
59}\r
60\r
61static int SekUnrecognizedOpcode()\r
62{\r
63 unsigned int pc, op;\r
64 pc = SekPc;\r
65 op = PicoCpu.read16(pc);\r
66#if defined(__DEBUG_PRINT) || defined(WIN32)\r
67 dprintf("Unrecognized Opcode %04x @ %06x", op, pc);\r
68#endif\r
69 // see if we are not executing trash\r
70 if (pc < 0x200 || (pc > Pico.romsize+4 && (pc&0xe00000)!=0xe00000)) {\r
71 PicoCpu.cycles = 0;\r
72 PicoCpu.stopped = 1;\r
73 return 1;\r
74 }\r
75 //exit(1);\r
76 return 0;\r
77}\r
78#endif\r
79\r
80\r
81#ifdef EMU_M68K\r
82static int SekIntAckM68K(int level)\r
83{\r
84 if (level == 4) { Pico.video.pending_ints = 0; dprintf("hack: [%i|%i]", Pico.m.scanline, SekCyclesDone()); }\r
85 else if(level == 6) { Pico.video.pending_ints &= ~0x20; dprintf("vack: [%i|%i]", Pico.m.scanline, SekCyclesDone()); }\r
86 CPU_INT_LEVEL = 0;\r
87 return M68K_INT_ACK_AUTOVECTOR;\r
88}\r
89#endif\r
90\r
91\r
92\r
93int SekInit()\r
94{\r
95#ifdef EMU_C68K\r
96 CycloneInit();\r
97 memset(&PicoCpu,0,sizeof(PicoCpu));\r
98 PicoCpu.IrqCallback=SekIntAck;\r
99 PicoCpu.ResetCallback=SekResetAck;\r
100 PicoCpu.UnrecognizedCallback=SekUnrecognizedOpcode;\r
101#endif\r
102#ifdef EMU_A68K\r
103 memset(&M68000_regs,0,sizeof(M68000_regs));\r
104 M68000_regs.IrqCallback=IrqCallback;\r
105 M68000_regs.pResetCallback=ResetCallback;\r
106 M68000_RESET(); // Init cpu emulator\r
107#endif\r
108#ifdef EMU_M68K\r
109 {\r
110 void *oldcontext = m68ki_cpu_p;\r
111 m68k_set_context(&PicoM68kCPU);\r
112 m68k_set_cpu_type(M68K_CPU_TYPE_68000);\r
113 m68k_init();\r
114 m68k_set_int_ack_callback(SekIntAckM68K);\r
115 m68k_pulse_reset(); // Init cpu emulator\r
116 m68k_set_context(oldcontext);\r
117 }\r
118#endif\r
119\r
120 return 0;\r
121}\r
122\r
123// Reset the 68000:\r
124int SekReset()\r
125{\r
126 if (Pico.rom==NULL) return 1;\r
127\r
128#ifdef EMU_C68K\r
129 PicoCpu.stopped=0;\r
130 PicoCpu.osp=0;\r
131 PicoCpu.srh =0x27; // Supervisor mode\r
132 PicoCpu.flags=4; // Z set\r
133 PicoCpu.irq=0;\r
134 PicoCpu.a[7]=PicoCpu.read32(0); // Stack Pointer\r
135 PicoCpu.membase=0;\r
136 PicoCpu.pc=PicoCpu.checkpc(PicoCpu.read32(4)); // Program Counter\r
137#endif\r
138#ifdef EMU_A68K\r
139 // Reset CPU: fetch SP and PC\r
140 M68000_regs.srh=0x27; // Supervisor mode\r
141 M68000_regs.a[7]=PicoRead32(0);\r
142 M68000_regs.pc =PicoRead32(4);\r
143 PicoInitPc(M68000_regs.pc);\r
144#endif\r
145#ifdef EMU_M68K\r
146 {\r
147 void *oldcontext = m68ki_cpu_p;\r
148 m68k_set_context(&PicoM68kCPU);\r
149 m68k_pulse_reset();\r
150 m68k_set_context(oldcontext);\r
151 }\r
152#endif\r
153\r
154 return 0;\r
155}\r
156\r
157\r
158int SekInterrupt(int irq)\r
159{\r
160#ifdef EMU_C68K\r
161 PicoCpu.irq=irq;\r
162#endif\r
163#ifdef EMU_A68K\r
164 M68000_regs.irq=irq; // raise irq (gets lowered after taken)\r
165#endif\r
166#ifdef EMU_M68K\r
167 {\r
168 void *oldcontext = m68ki_cpu_p;\r
169 m68k_set_context(&PicoM68kCPU);\r
170 m68k_set_irq(irq); // raise irq (gets lowered after taken or must be done in ack)\r
171 m68k_set_context(oldcontext);\r
172 }\r
173#endif\r
174 return 0;\r
175}\r
176\r
177//int SekPc() { return PicoCpu.pc-PicoCpu.membase; }\r
178//int SekPc() { return M68000_regs.pc; }\r
179//int SekPc() { return m68k_get_reg(NULL, M68K_REG_PC); }\r
180\r
181void SekState(unsigned char *data)\r
182{\r
183#ifdef EMU_C68K\r
184 memcpy(data,PicoCpu.d,0x44);\r
185#elif defined(EMU_A68K)\r
186 memcpy(data, M68000_regs.d, 0x40);\r
187 memcpy(data+0x40,&M68000_regs.pc,0x04);\r
188#elif defined(EMU_M68K)\r
189 memcpy(data, PicoM68kCPU.dar,0x40);\r
190 memcpy(data+0x40,&PicoM68kCPU.pc, 0x04);\r
191#endif\r
192}\r