misc: Use GCC builtins for byte-swap operations

[pcsx_rearmed.git] / plugins / dfsound / dma.c

/***************************************************************************\r
                            dma.c  -  description\r
                             -------------------\r
    begin                : Wed May 15 2002\r
    copyright            : (C) 2002 by Pete Bernert\r
    email                : BlackDove@addcom.de\r
 ***************************************************************************/\r
/***************************************************************************\r
 *                                                                         *\r
 *   This program is free software; you can redistribute it and/or modify  *\r
 *   it under the terms of the GNU General Public License as published by  *\r
 *   the Free Software Foundation; either version 2 of the License, or     *\r
 *   (at your option) any later version. See also the license.txt file for *\r
 *   additional informations.                                              *\r
 *                                                                         *\r
 ***************************************************************************/\r
\r
#include "stdafx.h"\r
\r
#define _IN_DMA\r
\r
#include "externals.h"\r
\r
////////////////////////////////////////////////////////////////////////\r
// READ DMA (one value)\r
////////////////////////////////////////////////////////////////////////\r
\r
unsigned short CALLBACK SPUreadDMA(void)\r
{\r
 unsigned short s = *(unsigned short *)(spu.spuMemC + spu.spuAddr);\r
 spu.spuAddr += 2;\r
 spu.spuAddr &= 0x7fffe;\r
\r
 return s;\r
}\r
\r
////////////////////////////////////////////////////////////////////////\r
// READ DMA (many values)\r
////////////////////////////////////////////////////////////////////////\r
\r
void CALLBACK SPUreadDMAMem(unsigned short *pusPSXMem, int iSize,\r
 unsigned int cycles)\r
{\r
 int i;\r
\r
 do_samples_if_needed(cycles, 1);\r
\r
 for(i=0;i<iSize;i++)\r
  {\r
   *pusPSXMem++ = *(unsigned short *)(spu.spuMemC + spu.spuAddr);\r
   spu.spuAddr += 2;\r
   spu.spuAddr &= 0x7fffe;\r
  }\r
}\r
\r
////////////////////////////////////////////////////////////////////////\r
////////////////////////////////////////////////////////////////////////\r
////////////////////////////////////////////////////////////////////////\r
\r
// to investigate: do sound data updates by writedma affect spu\r
// irqs? Will an irq be triggered, if new data is written to\r
// the memory irq address?\r
\r
////////////////////////////////////////////////////////////////////////\r
// WRITE DMA (one value)\r
////////////////////////////////////////////////////////////////////////\r
  \r
void CALLBACK SPUwriteDMA(unsigned short val)\r
{\r
 *(unsigned short *)(spu.spuMemC + spu.spuAddr) = val;\r
\r
 spu.spuAddr += 2;\r
 spu.spuAddr &= 0x7fffe;\r
 spu.bMemDirty = 1;\r
}\r
\r
////////////////////////////////////////////////////////////////////////\r
// WRITE DMA (many values)\r
////////////////////////////////////////////////////////////////////////\r
\r
void CALLBACK SPUwriteDMAMem(unsigned short *pusPSXMem, int iSize,\r
 unsigned int cycles)\r
{\r
 int i;\r
 \r
 do_samples_if_needed(cycles, 1);\r
 spu.bMemDirty = 1;\r
\r
 if(spu.spuAddr + iSize*2 < 0x80000)\r
  {\r
   memcpy(spu.spuMemC + spu.spuAddr, pusPSXMem, iSize*2);\r
   spu.spuAddr += iSize*2;\r
   return;\r
  }\r
\r
 for(i=0;i<iSize;i++)\r
  {\r
   *(unsigned short *)(spu.spuMemC + spu.spuAddr) = *pusPSXMem++;\r
   spu.spuAddr += 2;\r
   spu.spuAddr &= 0x7fffe;\r
  }\r
}\r
\r
////////////////////////////////////////////////////////////////////////\r