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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 | |
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9 | #include "../../PicoInt.h" |
10 | |
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11 | svp_t *svp = NULL; |
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12 | int PicoSVPCycles = 1000; // cycles/line |
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13 | |
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14 | /* save state stuff */ |
15 | typedef enum { |
16 | CHUNK_IRAM = CHUNK_CARTHW, |
17 | CHUNK_DRAM, |
18 | CHUNK_SSP |
19 | } chunk_name_e; |
20 | |
21 | static carthw_state_chunk svp_states[] = |
22 | { |
23 | { CHUNK_IRAM, 0x800, NULL }, |
24 | { CHUNK_DRAM, sizeof(svp->dram), NULL }, |
25 | { CHUNK_SSP, sizeof(svp->ssp1601), NULL }, |
26 | { 0, 0, NULL } |
27 | }; |
28 | |
29 | |
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30 | static void PicoSVPReset(void) |
31 | { |
32 | elprintf(EL_SVP, "SVP reset"); |
33 | |
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34 | memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800); |
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35 | ssp1601_reset(&svp->ssp1601); |
36 | } |
37 | |
38 | |
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39 | static void PicoSVPLine(int count) |
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40 | { |
41 | // ??? |
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42 | ssp1601_run(PicoSVPCycles * count); |
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43 | |
44 | // test mode |
45 | //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff; |
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46 | } |
47 | |
48 | |
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49 | static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) |
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50 | { |
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51 | if (source < Pico.romsize) // Rom |
52 | { |
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53 | source -= 2; |
54 | *srcp = (unsigned short *)(Pico.rom + (source&~1)); |
55 | *limitp = (unsigned short *)(Pico.rom + Pico.romsize); |
56 | return 1; |
57 | } |
58 | else if ((source & 0xfe0000) == 0x300000) |
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59 | { |
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60 | elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len); |
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61 | source &= 0x1fffe; |
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62 | source -= 2; |
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63 | *srcp = (unsigned short *)(svp->dram + source); |
64 | *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram)); |
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65 | return 1; |
66 | } |
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67 | else |
68 | elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len); |
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69 | |
70 | return 0; |
71 | } |
72 | |
73 | |
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74 | void PicoSVPInit(void) |
75 | { |
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76 | void *tmp; |
77 | |
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78 | elprintf(EL_SVP, "SVP init"); |
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79 | |
80 | tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp)); |
81 | if (tmp == NULL) |
82 | { |
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83 | elprintf(EL_STATUS|EL_SVP, "OOM for SVP data"); |
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84 | return; |
85 | } |
86 | |
87 | Pico.rom = tmp; |
88 | svp = (void *) ((char *)tmp + 0x200000); |
89 | memset(svp, 0, sizeof(*svp)); |
90 | |
91 | // init ok, setup hooks.. |
92 | PicoRead16Hook = PicoSVPRead16; |
93 | PicoWrite8Hook = PicoSVPWrite8; |
94 | PicoWrite16Hook = PicoSVPWrite16; |
95 | PicoDmaHook = PicoSVPDma; |
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96 | PicoResetHook = PicoSVPReset; |
97 | PicoLineHook = PicoSVPLine; |
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98 | |
99 | // save state stuff |
100 | svp_states[0].ptr = svp->iram_rom; |
101 | svp_states[1].ptr = svp->dram; |
102 | svp_states[2].ptr = &svp->ssp1601; |
103 | carthw_chunks = svp_states; |
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104 | } |
105 | |