firmware/buffer.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdio.h>
  22 #include "buffer.h"
  23
  24 #if (CONFIG_PLATFORM & PLATFORM_HOSTED)
  25 unsigned char audiobuffer[(MEM*1024-256)*1024];
  26 unsigned char *audiobufend = audiobuffer + sizeof(audiobuffer);
  27 #else
  28 /* defined in linker script */
  29 extern unsigned char audiobuffer[];
  30 #endif
  31
  32 unsigned char *audiobuf;
  33
  34 void buffer_init(void)
  35 {
  36     /* 32-bit aligned */
  37     audiobuf = (void *)(((unsigned long)audiobuffer + 3) & ~3);
  38 }
  39
  40 void *buffer_alloc(size_t size)
  41 {
  42     void *retval = audiobuf;
  43
  44     audiobuf += size;
  45     /* 32-bit aligned */
  46     audiobuf = (void *)(((unsigned long)audiobuf + 3) & ~3);
  47
  48     return retval;
  49 }
  50