source/mupen64plus-rsp-hle/src/cicx105.c

   1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
   2  *   Mupen64plus-rsp-hle - cicx105.c                                       *
   3  *   Mupen64Plus homepage: http://code.google.com/p/mupen64plus/           *
   4  *   Copyright (C) 2012 Bobby Smiles                                       *
   5  *   Copyright (C) 2009 Richard Goedeken                                   *
   6  *   Copyright (C) 2002 Hacktarux                                          *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
  22  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  23
  24 #include <string.h>
  25
  26 #include "hle.h"
  27
  28 /**
  29  * During IPL3 stage of CIC x105 games, the RSP performs some checks and transactions
  30  * necessary for booting the game.
  31  *
  32  * We only implement the needed DMA transactions for booting.
  33  *
  34  * Found in Banjo-Tooie, Zelda, Perfect Dark, ...)
  35  **/
  36 void cicx105_ucode()
  37 {
  38     // memcpy is okay to use because access constrains are met (alignment, size)
  39     unsigned int i;
  40     unsigned char * dst = rsp.RDRAM + 0x2fb1f0;
  41     unsigned char * src = rsp.IMEM + 0x120;
  42
  43     /* dma_read(0x1120, 0x1e8, 0x1e8) */
  44     memcpy(rsp.IMEM + 0x120, rsp.RDRAM + 0x1e8, 0x1f0);
  45
  46     /* dma_write(0x1120, 0x2fb1f0, 0xfe817000) */
  47     for (i = 0; i < 24; ++i)
  48     {
  49         memcpy(dst, src, 8);
  50         dst += 0xff0;
  51         src += 0x8;
  52
  53     }
  54 }
  55