osfmk/console/i386/video_scroll.c

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 #include <types.h>
  24 #include <console/video_console.h>
  25
  26 extern void bcopy(const void *, void *, size_t);
  27
  28 void video_scroll_up(unsigned long start,
  29                      unsigned long end,
  30                      unsigned long dest)
  31 {
  32     bcopy((void *) start, (void *) dest, (end - start) << 2);
  33 }
  34
  35 void video_scroll_down(unsigned long start,  /* HIGH addr */
  36                        unsigned long end,    /* LOW addr */
  37                        unsigned long dest)   /* HIGH addr */
  38 {
  39     bcopy((void *) end, (void *) dest, (start - end) << 2);
  40 }