misc: Use GCC builtins for byte-swap operations
[pcsx_rearmed.git] / plugins / dfsound / dma.c
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1/***************************************************************************\r
2 dma.c - description\r
3 -------------------\r
4 begin : Wed May 15 2002\r
5 copyright : (C) 2002 by Pete Bernert\r
6 email : BlackDove@addcom.de\r
7 ***************************************************************************/\r
8/***************************************************************************\r
9 * *\r
10 * This program is free software; you can redistribute it and/or modify *\r
11 * it under the terms of the GNU General Public License as published by *\r
12 * the Free Software Foundation; either version 2 of the License, or *\r
13 * (at your option) any later version. See also the license.txt file for *\r
14 * additional informations. *\r
15 * *\r
16 ***************************************************************************/\r
17\r
18#include "stdafx.h"\r
19\r
20#define _IN_DMA\r
21\r
22#include "externals.h"\r
23\r
24////////////////////////////////////////////////////////////////////////\r
25// READ DMA (one value)\r
26////////////////////////////////////////////////////////////////////////\r
27\r
28unsigned short CALLBACK SPUreadDMA(void)\r
29{\r
5514a050 30 unsigned short s = *(unsigned short *)(spu.spuMemC + spu.spuAddr);\r
31 spu.spuAddr += 2;\r
32 spu.spuAddr &= 0x7fffe;\r
ef79bbde 33\r
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34 return s;\r
35}\r
36\r
37////////////////////////////////////////////////////////////////////////\r
38// READ DMA (many values)\r
39////////////////////////////////////////////////////////////////////////\r
40\r
650adfd2 41void CALLBACK SPUreadDMAMem(unsigned short *pusPSXMem, int iSize,\r
42 unsigned int cycles)\r
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43{\r
44 int i;\r
45\r
63a4f6b6 46 do_samples_if_needed(cycles, 1);\r
650adfd2 47\r
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48 for(i=0;i<iSize;i++)\r
49 {\r
5514a050 50 *pusPSXMem++ = *(unsigned short *)(spu.spuMemC + spu.spuAddr);\r
51 spu.spuAddr += 2;\r
52 spu.spuAddr &= 0x7fffe;\r
ef79bbde 53 }\r
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54}\r
55\r
56////////////////////////////////////////////////////////////////////////\r
57////////////////////////////////////////////////////////////////////////\r
58////////////////////////////////////////////////////////////////////////\r
59\r
60// to investigate: do sound data updates by writedma affect spu\r
61// irqs? Will an irq be triggered, if new data is written to\r
62// the memory irq address?\r
63\r
64////////////////////////////////////////////////////////////////////////\r
65// WRITE DMA (one value)\r
66////////////////////////////////////////////////////////////////////////\r
67 \r
68void CALLBACK SPUwriteDMA(unsigned short val)\r
69{\r
5514a050 70 *(unsigned short *)(spu.spuMemC + spu.spuAddr) = val;\r
ef79bbde 71\r
5514a050 72 spu.spuAddr += 2;\r
73 spu.spuAddr &= 0x7fffe;\r
0c1151fe 74 spu.bMemDirty = 1;\r
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75}\r
76\r
77////////////////////////////////////////////////////////////////////////\r
78// WRITE DMA (many values)\r
79////////////////////////////////////////////////////////////////////////\r
80\r
650adfd2 81void CALLBACK SPUwriteDMAMem(unsigned short *pusPSXMem, int iSize,\r
82 unsigned int cycles)\r
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83{\r
84 int i;\r
fb552464 85 \r
63a4f6b6 86 do_samples_if_needed(cycles, 1);\r
0c1151fe 87 spu.bMemDirty = 1;\r
fb552464 88\r
3154bfab 89 if(spu.spuAddr + iSize*2 < 0x80000)\r
fb552464 90 {\r
5514a050 91 memcpy(spu.spuMemC + spu.spuAddr, pusPSXMem, iSize*2);\r
3154bfab 92 spu.spuAddr += iSize*2;\r
fb552464 93 return;\r
94 }\r
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95\r
96 for(i=0;i<iSize;i++)\r
97 {\r
5514a050 98 *(unsigned short *)(spu.spuMemC + spu.spuAddr) = *pusPSXMem++;\r
99 spu.spuAddr += 2;\r
100 spu.spuAddr &= 0x7fffe;\r
ef79bbde 101 }\r
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102}\r
103\r
104////////////////////////////////////////////////////////////////////////\r