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  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include <stdio.h>
  20 #include "buffer.h"
  21
  22 #ifdef SIMULATOR
  23 unsigned char audiobuffer[(MEM*1024-256)*1024];
  24 unsigned char *audiobufend = audiobuffer + sizeof(audiobuffer);
  25 #else
  26 /* defined in linker script */
  27 extern unsigned char audiobuffer[];
  28 #endif
  29
  30 unsigned char *audiobuf;
  31
  32 void buffer_init(void)
  33 {
  34     /* 32-bit aligned */
  35     audiobuf = (void *)(((unsigned long)audiobuffer + 3) & ~3);
  36 }
  37
  38 void *buffer_alloc(size_t size)
  39 {
  40     void *retval = audiobuf;
  41
  42     audiobuf += size;
  43     /* 32-bit aligned */
  44     audiobuf = (void *)(((unsigned long)audiobuf + 3) & ~3);
  45
  46     return retval;
  47 }
  48