/*****************************************************************************************
 Copyright (c) 2002-2004 The UbixOS Project
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are
 permitted provided that the following conditions are met:

 Redistributions of source code must retain the above copyright notice, this list of
 conditions, the following disclaimer and the list of authors.  Redistributions in binary
 form must reproduce the above copyright notice, this list of conditions, the following
 disclaimer and the list of authors in the documentation and/or other materials provided
 with the distribution. Neither the name of the UbixOS Project nor the names of its
 contributors may be used to endorse or promote products derived from this software
 without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id$

*****************************************************************************************/

#include <sys/io.h>
#include <sys/video.h>
#include <ubixos/types.h>
#include <ubixos/spinlock.h>
#include <ubixos/tty.h>

static unsigned char  *videoBuffer = (char *)0xB8000;
int                    printColor = defaultColor;


void backSpace() {
  uInt32 bufferOffset = 0x0;
  outportByte(0x3d4, 0x0e);
  bufferOffset = inportByte(0x3d5);
  bufferOffset <<= 0x8; /* Shift Address Left 8 Bits */
  outportByte(0x3d4, 0x0f);
  bufferOffset += inportByte(0x3d5);
  bufferOffset <<= 0x1; /* Shift Address Left 1 Bits */
  videoBuffer[bufferOffset--] = 0x20;
  videoBuffer[bufferOffset--] = printColor;
  videoBuffer[bufferOffset]   = 0x20;
  bufferOffset >>= 0x1;
  tty_foreground->tty_x = (bufferOffset &  0xFF);
  tty_foreground->tty_y = (bufferOffset >> 0x8);
  outportByte(0x3D4, 0x0f);
  outportByte(0x3D5, tty_foreground->tty_x);
  outportByte(0x3D4, 0x0e);
  outportByte(0x3D5, tty_foreground->tty_y);
  return;
  }

void 
kprint(char *string)
{

  unsigned int    bufferOffset = 0x0, character = 0x0, i = 0x0;

  /* Short circuit if we're in tty mode */
  if (0 != tty_foreground)
  {
    //tty_print(string,tty_find(0));
    //return;
  }

  /* We Need To Get The Y Position */
  outportByte(0x3D4, 0x0e);
  bufferOffset = inportByte(0x3D5);
  bufferOffset <<= 8;		/* Shift Address Left 8 Bits */
  /* Then We Need To Add The X Position */
  outportByte(0x3D4, 0x0f);
  bufferOffset += inportByte(0x3D5);
  bufferOffset <<= 1;		/* Shift Address Left 1 Bits */

  while ((character = *string++)) {
    switch (character) {
    case '\n':
      bufferOffset = (bufferOffset / 160) * 160 + 160;
      break;
    default:
      videoBuffer[bufferOffset++] = character;
      videoBuffer[bufferOffset++] = printColor;
      break;
    }				/* switch */
    /* Check To See If We Are Out Of Bounds */
    if (bufferOffset >= 160 * 25) {
      for (i = 0; i < 160 * 24; i++) {
	videoBuffer[i] = videoBuffer[i + 160];
      }				/* for */
      for (i = 0; i < 80; i++) {
	videoBuffer[(160 * 24) + (i * 2)] = 0x20;
	videoBuffer[(160 * 24) + (i * 2) + 1] = printColor;
      }				/* for */
      bufferOffset -= 160;
    }				/* if */
  }				/* while */
  bufferOffset >>= 1;		/* Set the new cursor position  */
  outportByte(0x3D4, 0x0f);
  outportByte(0x3D5, ((bufferOffset & 0x0ff) & 0xFF));
  outportByte(0x3D4, 0x0e);
  outportByte(0x3D5, ((bufferOffset >> 8) & 0xFF));

  return;
}

/* Clears The Screen */
void clearScreen() {
  short i = 0x0;

  for (i = 0x0; i < (80 * 25); i++) {
    videoBuffer[i * 2] = 0x20;
    videoBuffer[i * 2 + 1] = defaultColor;
    }
  outportByte(0x3D4, 0x0f);
  outportByte(0x3D5, 0);
  outportByte(0x3D4, 0x0e);
  outportByte(0x3D5, 0);
  }

/***
 $Log$
 Revision 1.12  2004/09/07 22:00:20  apwillia
 Fix gcc 2.95 being retarded and not follwing the C99 specs

 Revision 1.11  2004/09/07 21:50:25  apwillia
 Make kprintf stay on tty0

 Revision 1.10  2004/09/06 21:39:21  reddawg
 Fixes: Changed the order in which tasks are deleted from the queues. Also fixed backspace to work in the virtual ttys....

 Revision 1.9  2004/08/06 22:32:16  reddawg
 Ubix Works Again

 Revision 1.7  2004/07/22 18:46:16  reddawg
 Fixed up exec.c

 Revision 1.6  2004/07/19 01:40:55  reddawg
 video: added spinLock protection

 Revision 1.5  2004/07/16 04:06:32  reddawg
 Tune ups this stuff should of been taken care of months ago

 Revision 1.4  2004/06/29 11:41:44  reddawg
 Fixed some global variables

 Revision 1.3  2004/06/15 12:10:31  reddawg
 Cleaned Up

 Revision 1.2  2004/04/29 19:49:04  reddawg
 Cleaned Out Old Code

 Revision 1.1.1.1  2004/04/15 12:07:18  reddawg
 UbixOS v1.0

 Revision 1.24  2004/04/13 16:36:34  reddawg
 Changed our copyright, it is all now under a BSD-Style license
 END
 ***/