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1 | // The SVP chip emulator |
2 | |
3 | // (c) Copyright 2008, Grazvydas "notaz" Ignotas |
4 | // Free for non-commercial use. |
5 | |
6 | // For commercial use, separate licencing terms must be obtained. |
7 | |
8 | |
efcba75f |
9 | #include "../../pico_int.h" |
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10 | #include "compiler.h" |
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11 | |
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12 | svp_t *svp = NULL; |
3d48ce71 |
13 | int PicoSVPCycles = 850; // cycles/line, just a guess |
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14 | static int svp_dyn_ready = 0; |
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15 | |
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16 | /* save state stuff */ |
17 | typedef enum { |
18 | CHUNK_IRAM = CHUNK_CARTHW, |
19 | CHUNK_DRAM, |
20 | CHUNK_SSP |
21 | } chunk_name_e; |
22 | |
23 | static carthw_state_chunk svp_states[] = |
24 | { |
25 | { CHUNK_IRAM, 0x800, NULL }, |
26 | { CHUNK_DRAM, sizeof(svp->dram), NULL }, |
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27 | { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL }, |
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28 | { 0, 0, NULL } |
29 | }; |
30 | |
31 | |
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32 | static void PicoSVPReset(void) |
33 | { |
34 | elprintf(EL_SVP, "SVP reset"); |
35 | |
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36 | memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800); |
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37 | ssp1601_reset(&svp->ssp1601); |
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38 | #ifndef PSP |
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39 | if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready) |
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40 | ssp1601_dyn_reset(&svp->ssp1601); |
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41 | #endif |
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42 | } |
43 | |
44 | |
e7aac062 |
45 | static void PicoSVPLine(void) |
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46 | { |
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47 | int count = 1; |
48 | #if defined(ARM) || defined(PSP) |
49 | // performance hack |
50 | static int delay_lines = 0; |
51 | delay_lines++; |
52 | if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311) |
53 | return; |
54 | count = delay_lines; |
55 | delay_lines = 0; |
56 | #endif |
57 | |
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58 | #ifndef PSP |
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59 | if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready) |
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60 | ssp1601_dyn_run(PicoSVPCycles * count); |
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61 | else |
62 | #endif |
63 | { |
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64 | ssp1601_run(PicoSVPCycles * count); |
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65 | svp_dyn_ready = 0; // just in case |
66 | } |
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67 | |
68 | // test mode |
69 | //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff; |
017512f2 |
70 | } |
71 | |
72 | |
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73 | static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) |
017512f2 |
74 | { |
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75 | if (source < Pico.romsize) // Rom |
76 | { |
50483b53 |
77 | source -= 2; |
78 | *srcp = (unsigned short *)(Pico.rom + (source&~1)); |
79 | *limitp = (unsigned short *)(Pico.rom + Pico.romsize); |
80 | return 1; |
81 | } |
82 | else if ((source & 0xfe0000) == 0x300000) |
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83 | { |
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84 | elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len); |
017512f2 |
85 | source &= 0x1fffe; |
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86 | source -= 2; |
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87 | *srcp = (unsigned short *)(svp->dram + source); |
88 | *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram)); |
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89 | return 1; |
90 | } |
d26dc685 |
91 | else |
92 | elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len); |
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93 | |
94 | return 0; |
95 | } |
96 | |
97 | |
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98 | void PicoSVPInit(void) |
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99 | { |
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100 | } |
101 | |
102 | |
103 | void PicoSVPStartup(void) |
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104 | { |
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105 | void *tmp; |
106 | |
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107 | elprintf(EL_STATUS, "SVP startup"); |
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108 | |
109 | tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp)); |
110 | if (tmp == NULL) |
111 | { |
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112 | elprintf(EL_STATUS|EL_SVP, "OOM for SVP data"); |
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113 | return; |
114 | } |
115 | |
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116 | //PicoOpt &= ~0x20000; |
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117 | Pico.rom = tmp; |
118 | svp = (void *) ((char *)tmp + 0x200000); |
119 | memset(svp, 0, sizeof(*svp)); |
120 | |
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121 | // init SVP compiler |
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122 | svp_dyn_ready = 0; |
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123 | #ifndef PSP |
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124 | if (PicoOpt & POPT_EN_SVP_DRC) { |
125 | if (ssp1601_dyn_startup()) |
126 | return; |
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127 | svp_dyn_ready = 1; |
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128 | } |
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129 | #endif |
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130 | |
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131 | // init ok, setup hooks.. |
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132 | PicoCartMemSetup = PicoSVPMemSetup; |
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133 | PicoDmaHook = PicoSVPDma; |
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134 | PicoResetHook = PicoSVPReset; |
135 | PicoLineHook = PicoSVPLine; |
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136 | |
137 | // save state stuff |
138 | svp_states[0].ptr = svp->iram_rom; |
139 | svp_states[1].ptr = svp->dram; |
140 | svp_states[2].ptr = &svp->ssp1601; |
141 | carthw_chunks = svp_states; |
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142 | PicoAHW |= PAHW_SVP; |
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143 | } |
144 | |
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145 | |