reactos/boot/freeldr/freeldr/video/video.c

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1998-2003  Brian Palmer  <brianp@sginet.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <freeldr.h>
  21 #include <video.h>
  22 #include <portio.h>
  23 #include <mm.h>
  24 #include <machine.h>
  25
  26
  27 PVOID   VideoOffScreenBuffer = NULL;
  28
  29 PVOID VideoAllocateOffScreenBuffer(VOID)
  30 {
  31         U32             BufferSize;
  32
  33         if (VideoOffScreenBuffer != NULL)
  34         {
  35                 MmFreeMemory(VideoOffScreenBuffer);
  36                 VideoOffScreenBuffer = NULL;
  37         }
  38
  39         BufferSize = MachVideoGetBufferSize();
  40
  41         VideoOffScreenBuffer = MmAllocateMemory(BufferSize);
  42
  43         return VideoOffScreenBuffer;
  44 }