video.c

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/*****************************************************************************************
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 All rights reserved.

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 permitted provided that the following conditions are met:

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 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
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 without specific prior written permission.

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 $Id: video_8c-source.html 88 2016-01-12 00:11:29Z reddawg $

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

#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 (NULL != 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);
  }

/***
 END
 ***/

---