root / hw / gusemu.h @ 6a90e308
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1 | 423d65f4 | balrog | /*
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2 | 423d65f4 | balrog | * GUSEMU32 - API
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3 | 423d65f4 | balrog | *
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4 | 423d65f4 | balrog | * Copyright (C) 2000-2007 Tibor "TS" Schütz
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5 | 423d65f4 | balrog | *
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6 | 423d65f4 | balrog | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 423d65f4 | balrog | * of this software and associated documentation files (the "Software"), to deal
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8 | 423d65f4 | balrog | * in the Software without restriction, including without limitation the rights
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9 | 423d65f4 | balrog | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 423d65f4 | balrog | * copies of the Software, and to permit persons to whom the Software is
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11 | 423d65f4 | balrog | * furnished to do so, subject to the following conditions:
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12 | 423d65f4 | balrog | *
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13 | 423d65f4 | balrog | * The above copyright notice and this permission notice shall be included in
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14 | 423d65f4 | balrog | * all copies or substantial portions of the Software.
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15 | 423d65f4 | balrog | *
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16 | 423d65f4 | balrog | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 423d65f4 | balrog | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 423d65f4 | balrog | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 423d65f4 | balrog | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 423d65f4 | balrog | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 423d65f4 | balrog | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 423d65f4 | balrog | * THE SOFTWARE.
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23 | 423d65f4 | balrog | */
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24 | 423d65f4 | balrog | |
25 | 423d65f4 | balrog | #ifndef GUSEMU_H
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26 | 423d65f4 | balrog | #define GUSEMU_H
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27 | 423d65f4 | balrog | |
28 | 423d65f4 | balrog | /* data types (need to be adjusted if neither a VC6 nor a C99 compatible compiler is used) */
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29 | 423d65f4 | balrog | |
30 | 423d65f4 | balrog | #if defined _WIN32 && defined _MSC_VER /* doesnt support other win32 compilers yet, do it yourself... */ |
31 | 423d65f4 | balrog | typedef unsigned char GUSbyte; |
32 | 423d65f4 | balrog | typedef unsigned short GUSword; |
33 | 423d65f4 | balrog | typedef unsigned int GUSdword; |
34 | 423d65f4 | balrog | typedef signed char GUSchar; |
35 | 731ba0ce | malc | typedef signed short GUSsample; |
36 | 423d65f4 | balrog | #else
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37 | 423d65f4 | balrog | #include <stdint.h> |
38 | 423d65f4 | balrog | typedef int8_t GUSchar;
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39 | 423d65f4 | balrog | typedef uint8_t GUSbyte;
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40 | 423d65f4 | balrog | typedef uint16_t GUSword;
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41 | 423d65f4 | balrog | typedef uint32_t GUSdword;
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42 | 731ba0ce | malc | typedef int16_t GUSsample;
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43 | 423d65f4 | balrog | #endif
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44 | 423d65f4 | balrog | |
45 | 423d65f4 | balrog | typedef struct _GUSEmuState |
46 | 423d65f4 | balrog | { |
47 | 423d65f4 | balrog | GUSbyte *himemaddr; /* 1024*1024 bytes used for storing uploaded samples (+32 additional bytes for read padding) */
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48 | 423d65f4 | balrog | GUSbyte *gusdatapos; /* (gusdataend-gusdata) bytes used for storing emulated GF1/mixer register states (32*32+4 bytes in initial GUSemu32 version) */
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49 | 9df34396 | Gerd Hoffmann | uint32_t gusirq; |
50 | 9df34396 | Gerd Hoffmann | uint32_t gusdma; |
51 | 423d65f4 | balrog | unsigned int timer1fraction; |
52 | 423d65f4 | balrog | unsigned int timer2fraction; |
53 | 423d65f4 | balrog | void *opaque;
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54 | 423d65f4 | balrog | } GUSEmuState; |
55 | 423d65f4 | balrog | |
56 | 423d65f4 | balrog | /* ** Callback functions needed: */
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57 | 423d65f4 | balrog | /* NMI is defined as hwirq=-1 (not supported (yet?)) */
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58 | 423d65f4 | balrog | /* GUS_irqrequest returns the number of IRQs actually scheduled into the virtual machine */
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59 | 423d65f4 | balrog | /* Level triggered IRQ simulations normally return 1 */
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60 | 423d65f4 | balrog | /* Event triggered IRQ simulation can safely ignore GUS_irqclear calls */
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61 | 423d65f4 | balrog | int GUS_irqrequest(GUSEmuState *state, int hwirq, int num);/* needed in both mixer and bus emulation functions. */ |
62 | 423d65f4 | balrog | void GUS_irqclear( GUSEmuState *state, int hwirq); /* used by gus_write() only - can be left empty for mixer functions */ |
63 | 423d65f4 | balrog | void GUS_dmarequest(GUSEmuState *state); /* used by gus_write() only - can be left empty for mixer functions */ |
64 | 423d65f4 | balrog | |
65 | 423d65f4 | balrog | /* ** ISA bus interface functions: */
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66 | 423d65f4 | balrog | |
67 | 423d65f4 | balrog | /* Port I/O handlers */
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68 | 423d65f4 | balrog | /* support the following ports: */
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69 | 423d65f4 | balrog | /* 2x0,2x6,2x8...2xF,3x0...3x7; */
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70 | 423d65f4 | balrog | /* optional: 388,389 (at least writes should be forwarded or some GUS detection algorithms will fail) */
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71 | 423d65f4 | balrog | /* data is passed in host byte order */
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72 | 423d65f4 | balrog | unsigned int gus_read( GUSEmuState *state, int port, int size); |
73 | 423d65f4 | balrog | void gus_write(GUSEmuState *state, int port, int size, unsigned int data); |
74 | 423d65f4 | balrog | /* size is given in bytes (1 for byte, 2 for word) */
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75 | 423d65f4 | balrog | |
76 | 423d65f4 | balrog | /* DMA data transfer function */
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77 | 423d65f4 | balrog | /* data pointed to is passed in native x86 order */
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78 | 423d65f4 | balrog | void gus_dma_transferdata(GUSEmuState *state, char *dma_addr, unsigned int count, int TC); |
79 | 423d65f4 | balrog | /* Called back by GUS_start_DMA as soon as the emulated DMA controller is ready for a transfer to or from GUS */
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80 | 423d65f4 | balrog | /* (might be immediately if the DMA controller was programmed first) */
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81 | 423d65f4 | balrog | /* dma_addr is an already translated address directly pointing to the beginning of the memory block */
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82 | 423d65f4 | balrog | /* do not forget to update DMA states after the call, including the DREQ and TC flags */
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83 | 423d65f4 | balrog | /* it is possible to break down a single transfer into multiple ones, but take care that: */
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84 | 423d65f4 | balrog | /* -dma_count is actually count-1 */
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85 | 423d65f4 | balrog | /* -before and during a transfer, DREQ is set and TC cleared */
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86 | 423d65f4 | balrog | /* -when calling gus_dma_transferdata(), TC is only set true for call transfering the last byte */
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87 | 423d65f4 | balrog | /* -after the last transfer, DREQ is cleared and TC is set */
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88 | 423d65f4 | balrog | |
89 | 423d65f4 | balrog | /* ** GF1 mixer emulation functions: */
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90 | 423d65f4 | balrog | /* Usually, gus_irqgen should be called directly after gus_mixvoices if you can meet the recommended ranges. */
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91 | 423d65f4 | balrog | /* If the interrupts are executed immediately (i.e., are synchronous), it may be useful to break this */
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92 | 423d65f4 | balrog | /* down into a sequence of gus_mixvoice();gus_irqgen(); calls while mixing an audio block. */
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93 | 423d65f4 | balrog | /* If the interrupts are asynchronous, it may be needed to use a separate thread mixing into a temporary */
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94 | 423d65f4 | balrog | /* audio buffer in order to avoid quality loss caused by large numsamples and elapsed_time values. */
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95 | 423d65f4 | balrog | |
96 | 731ba0ce | malc | void gus_mixvoices(GUSEmuState *state, unsigned int playback_freq, unsigned int numsamples, GUSsample *bufferpos); |
97 | 423d65f4 | balrog | /* recommended range: 10 < numsamples < 100 */
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98 | 423d65f4 | balrog | /* lower values may result in increased rounding error, higher values often cause audible timing delays */
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99 | 423d65f4 | balrog | |
100 | 423d65f4 | balrog | void gus_irqgen(GUSEmuState *state, unsigned int elapsed_time); |
101 | 423d65f4 | balrog | /* recommended range: 80us < elapsed_time < max(1000us, numsamples/playback_freq) */
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102 | 423d65f4 | balrog | /* lower values won´t provide any benefit at all, higher values can cause audible timing delays */
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103 | 423d65f4 | balrog | /* note: masked timers are also calculated by this function, thus it might be needed even without any IRQs in use! */
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104 | 423d65f4 | balrog | |
105 | 423d65f4 | balrog | #endif /* gusemu.h */ |