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1 | // This is part of Pico Library |
2 | |
3 | // (c) Copyright 2004 Dave, All rights reserved. |
4 | // (c) Copyright 2006 notaz, All rights reserved. |
5 | // Free for non-commercial use. |
6 | |
7 | // For commercial use, separate licencing terms must be obtained. |
8 | |
9 | |
10 | #include "../PicoInt.h" |
11 | |
12 | |
13 | int SekCycleCntS68k=0; // cycles done in this frame |
14 | int SekCycleAimS68k=0; // cycle aim |
15 | |
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16 | #ifdef EMU_C68K |
17 | // ---------------------- Cyclone 68000 ---------------------- |
18 | struct Cyclone PicoCpuS68k; |
19 | #endif |
20 | |
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21 | #ifdef EMU_M68K |
22 | // ---------------------- MUSASHI 68000 ---------------------- |
23 | m68ki_cpu_core PicoS68kCPU; // Mega CD's CPU |
24 | #endif |
25 | |
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26 | static int irqs = 0; // TODO: 2 context |
27 | |
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28 | |
29 | #ifdef EMU_M68K |
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30 | static int SekIntAckS68k(int level) |
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31 | { |
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32 | int level_new = 0; |
33 | irqs &= ~(1 << level); |
34 | irqs &= Pico_mcd->s68k_regs[0x33]; |
35 | if (irqs) { |
36 | level_new = 6; |
37 | while (level_new > 0) { if (irqs & (1 << level_new)) break; level_new--; } |
38 | } |
39 | |
40 | dprintf("s68kACK %i -> %i", level, level_new); |
41 | CPU_INT_LEVEL = level_new << 8; |
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42 | return M68K_INT_ACK_AUTOVECTOR; |
43 | } |
44 | #endif |
45 | |
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46 | #ifdef EMU_C68K |
47 | // interrupt acknowledgment |
48 | static void SekIntAck(int level) |
49 | { |
50 | int level_new = 0; |
51 | irqs &= ~(1 << level); |
52 | irqs &= Pico_mcd->s68k_regs[0x33]; |
53 | if (irqs) { |
54 | level_new = 6; |
55 | while (level_new > 0) { if (irqs & (1 << level_new)) break; level_new--; } |
56 | } |
57 | |
58 | dprintf("s68kACK %i -> %i", level, level_new); |
59 | PicoCpuS68k.irq = level_new; |
60 | } |
61 | |
62 | static void SekResetAck() |
63 | { |
64 | dprintf("s68k: Reset encountered @ %06x", SekPcS68k); |
65 | } |
66 | |
67 | static int SekUnrecognizedOpcode() |
68 | { |
69 | unsigned int pc, op; |
70 | pc = SekPcS68k; |
71 | op = PicoCpuS68k.read16(pc); |
72 | dprintf("Unrecognized Opcode %04x @ %06x", op, pc); |
73 | //exit(1); |
74 | return 0; |
75 | } |
76 | #endif |
77 | |
78 | |
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79 | |
80 | int SekInitS68k() |
81 | { |
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82 | #ifdef EMU_C68K |
83 | // CycloneInit(); |
84 | memset(&PicoCpuS68k,0,sizeof(PicoCpuS68k)); |
85 | PicoCpuS68k.IrqCallback=SekIntAck; |
86 | PicoCpuS68k.ResetCallback=SekResetAck; |
87 | PicoCpuS68k.UnrecognizedCallback=SekUnrecognizedOpcode; |
88 | #endif |
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89 | #ifdef EMU_M68K |
90 | { |
91 | // Musashi is not very context friendly.. |
92 | void *oldcontext = m68ki_cpu_p; |
93 | m68k_set_context(&PicoS68kCPU); |
94 | m68k_set_cpu_type(M68K_CPU_TYPE_68000); |
95 | m68k_init(); |
96 | m68k_set_int_ack_callback(SekIntAckS68k); |
97 | // m68k_pulse_reset(); // not yet, memmap is not set up |
98 | m68k_set_context(oldcontext); |
99 | } |
100 | #endif |
101 | |
102 | return 0; |
103 | } |
104 | |
105 | // Reset the 68000: |
106 | int SekResetS68k() |
107 | { |
108 | if (Pico.rom==NULL) return 1; |
109 | |
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110 | #ifdef EMU_C68K |
111 | PicoCpuS68k.stopped=0; |
112 | PicoCpuS68k.osp=0; |
113 | PicoCpuS68k.srh =0x27; // Supervisor mode |
114 | PicoCpuS68k.flags=4; // Z set |
115 | PicoCpuS68k.irq=0; |
116 | PicoCpuS68k.a[7]=PicoCpuS68k.read32(0); // Stack Pointer |
117 | PicoCpuS68k.membase=0; |
118 | PicoCpuS68k.pc=PicoCpuS68k.checkpc(PicoCpuS68k.read32(4)); // Program Counter |
119 | #endif |
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120 | #ifdef EMU_M68K |
121 | { |
122 | void *oldcontext = m68ki_cpu_p; |
123 | |
124 | m68k_set_context(&PicoS68kCPU); |
125 | m68k_pulse_reset(); |
126 | m68k_set_context(oldcontext); |
127 | } |
128 | #endif |
129 | |
130 | return 0; |
131 | } |
132 | |
133 | int SekInterruptS68k(int irq) |
134 | { |
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135 | irqs |= 1 << irq; |
136 | #ifdef EMU_C68K |
137 | PicoCpuS68k.irq=irq; |
138 | #endif |
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139 | #ifdef EMU_M68K |
140 | void *oldcontext = m68ki_cpu_p; |
141 | m68k_set_context(&PicoS68kCPU); |
142 | m68k_set_irq(irq); // raise irq (gets lowered after taken or must be done in ack) |
143 | m68k_set_context(oldcontext); |
144 | #endif |
145 | return 0; |
146 | } |
147 | |