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1 | // (c) Copyright 2006 notaz, All rights reserved. |
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2 | |
3 | |
4 | #include "../PicoInt.h" |
5 | |
6 | |
7 | int SekCycleCntS68k=0; // cycles done in this frame |
8 | int SekCycleAimS68k=0; // cycle aim |
9 | |
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10 | #ifdef EMU_C68K |
11 | // ---------------------- Cyclone 68000 ---------------------- |
12 | struct Cyclone PicoCpuS68k; |
13 | #endif |
14 | |
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15 | #ifdef EMU_M68K |
16 | // ---------------------- MUSASHI 68000 ---------------------- |
17 | m68ki_cpu_core PicoS68kCPU; // Mega CD's CPU |
18 | #endif |
19 | |
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20 | static int new_irq_level(int level) |
21 | { |
22 | int level_new = 0, irqs; |
23 | Pico_mcd->m.s68k_pend_ints &= ~(1 << level); |
24 | irqs = Pico_mcd->m.s68k_pend_ints; |
25 | irqs &= Pico_mcd->s68k_regs[0x33]; |
26 | while ((irqs >>= 1)) level_new++; |
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27 | |
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28 | return level_new; |
29 | } |
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30 | |
31 | #ifdef EMU_M68K |
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32 | static int SekIntAckS68k(int level) |
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33 | { |
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34 | int level_new = new_irq_level(level); |
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35 | dprintf("s68kACK %i -> %i", level, level_new); |
36 | CPU_INT_LEVEL = level_new << 8; |
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37 | return M68K_INT_ACK_AUTOVECTOR; |
38 | } |
39 | #endif |
40 | |
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41 | #ifdef EMU_C68K |
42 | // interrupt acknowledgment |
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43 | static void SekIntAckS68k(int level) |
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44 | { |
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45 | int level_new = new_irq_level(level); |
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46 | |
47 | dprintf("s68kACK %i -> %i", level, level_new); |
48 | PicoCpuS68k.irq = level_new; |
49 | } |
50 | |
51 | static void SekResetAck() |
52 | { |
53 | dprintf("s68k: Reset encountered @ %06x", SekPcS68k); |
54 | } |
55 | |
56 | static int SekUnrecognizedOpcode() |
57 | { |
58 | unsigned int pc, op; |
59 | pc = SekPcS68k; |
60 | op = PicoCpuS68k.read16(pc); |
61 | dprintf("Unrecognized Opcode %04x @ %06x", op, pc); |
62 | //exit(1); |
63 | return 0; |
64 | } |
65 | #endif |
66 | |
67 | |
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68 | |
69 | int SekInitS68k() |
70 | { |
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71 | #ifdef EMU_C68K |
72 | // CycloneInit(); |
73 | memset(&PicoCpuS68k,0,sizeof(PicoCpuS68k)); |
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74 | PicoCpuS68k.IrqCallback=SekIntAckS68k; |
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75 | PicoCpuS68k.ResetCallback=SekResetAck; |
76 | PicoCpuS68k.UnrecognizedCallback=SekUnrecognizedOpcode; |
77 | #endif |
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78 | #ifdef EMU_M68K |
79 | { |
80 | // Musashi is not very context friendly.. |
81 | void *oldcontext = m68ki_cpu_p; |
82 | m68k_set_context(&PicoS68kCPU); |
83 | m68k_set_cpu_type(M68K_CPU_TYPE_68000); |
84 | m68k_init(); |
85 | m68k_set_int_ack_callback(SekIntAckS68k); |
86 | // m68k_pulse_reset(); // not yet, memmap is not set up |
87 | m68k_set_context(oldcontext); |
88 | } |
89 | #endif |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | // Reset the 68000: |
95 | int SekResetS68k() |
96 | { |
97 | if (Pico.rom==NULL) return 1; |
98 | |
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99 | #ifdef EMU_C68K |
100 | PicoCpuS68k.stopped=0; |
101 | PicoCpuS68k.osp=0; |
102 | PicoCpuS68k.srh =0x27; // Supervisor mode |
103 | PicoCpuS68k.flags=4; // Z set |
104 | PicoCpuS68k.irq=0; |
105 | PicoCpuS68k.a[7]=PicoCpuS68k.read32(0); // Stack Pointer |
106 | PicoCpuS68k.membase=0; |
107 | PicoCpuS68k.pc=PicoCpuS68k.checkpc(PicoCpuS68k.read32(4)); // Program Counter |
108 | #endif |
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109 | #ifdef EMU_M68K |
110 | { |
111 | void *oldcontext = m68ki_cpu_p; |
112 | |
113 | m68k_set_context(&PicoS68kCPU); |
114 | m68k_pulse_reset(); |
115 | m68k_set_context(oldcontext); |
116 | } |
117 | #endif |
118 | |
119 | return 0; |
120 | } |
121 | |
122 | int SekInterruptS68k(int irq) |
123 | { |
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124 | int irqs, real_irq = 1; |
125 | Pico_mcd->m.s68k_pend_ints |= 1 << irq; |
126 | irqs = Pico_mcd->m.s68k_pend_ints >> 1; |
127 | while ((irqs >>= 1)) real_irq++; // this is probably only needed for Cyclone |
128 | |
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129 | #ifdef EMU_C68K |
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130 | PicoCpuS68k.irq=real_irq; |
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131 | #endif |
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132 | #ifdef EMU_M68K |
133 | void *oldcontext = m68ki_cpu_p; |
134 | m68k_set_context(&PicoS68kCPU); |
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135 | m68k_set_irq(real_irq); // raise irq (gets lowered after taken or must be done in ack) |
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136 | m68k_set_context(oldcontext); |
137 | #endif |
138 | return 0; |
139 | } |
140 | |