snes9xgx/source/ngc/aram.cpp

/****************************************************************************
 * Snes9x 1.50 
 *
 * Nintendo Gamecube Audio RAM
 *
 * softdev July 2006
 ****************************************************************************/
#include <gccore.h>
#include <string.h>
#include "aram.h"

#define ARAM_READ				1
#define ARAM_WRITE				0

#define TEMPSIZE 32768
static char tempbuffer[TEMPSIZE] ATTRIBUTE_ALIGN (32);

/**
 * ARAMPut
 *
 * Move data from MAIN memory to ARAM
 */
void
ARAMPut (char *src, char *dst, int len)
{
  DCFlushRange (src, len);
  AR_StartDMA (ARAM_WRITE, (u32) src, (u32) dst, len);
  while (AR_GetDMAStatus());
}

/**
 * ARAMFetch
 *
 * This function will move data from ARAM to MAIN memory
 */
void
ARAMFetch (char *dst, char *src, int len)
{
  DCInvalidateRange (dst, len);
  AR_StartDMA (ARAM_READ, (u32) dst, (u32) src, len);
  while (AR_GetDMAStatus ());
}

/**
 * ARAMFetchSlow
 *
 * Required as SNES memory may NOT be 32-byte aligned
 */
void
ARAMFetchSlow (char *dst, char *src, int len)
{
  int t;

  if (len > TEMPSIZE)
    {
      t = 0;
      while (t < len)
	{
	  ARAMFetch (tempbuffer, src + t, TEMPSIZE);

	  if (t + TEMPSIZE > len)
	    {
	      memcpy (dst + t, tempbuffer, len - t);
	    }
	  else
	    memcpy (dst + t, tempbuffer, TEMPSIZE);

	  t += TEMPSIZE;
	}

    }
  else
    {
      ARAMFetch (tempbuffer, src, len);
      memcpy (dst, tempbuffer, len);
    }
}