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/*

 * outch.c  - This file contains code for displaying characters

 *            on the console uisng information that should be

 *            maintained by the BIOS in its data Area.

 *

 * Copyright (C) 1998  Eric Valette (valette@crf.canon.fr)

 *                     Canon Centre Recherche France.

 *

 *  The license and distribution terms for this file may be

 *  found in found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 * $Id: outch.c,v 1.2 2001-09-27 11:59:48 chris Exp $

 */

#include <bsp.h>

#include <stdlib.h>

#include <string.h>

#include <crt.h>

extern void wr_cursor(int, unsigned short);

#define TAB_SPACE 4

static unsigned short *bitMapBaseAddr;

static unsigned short ioCrtBaseAddr;

static unsigned short maxCol;

static unsigned short maxRow;

static unsigned char  row;

static unsigned char  column;

static unsigned short attribute;

static unsigned int   nLines;

static void

scroll(void)

{

    int i, j;                               /* Counters */

    unsigned short *pt_scroll, *pt_bitmap;  /* Pointers on the bit-map  */

    pt_bitmap = bitMapBaseAddr;

    j = 0;

    pt_bitmap = pt_bitmap + j;

    pt_scroll = pt_bitmap + maxCol;

    for (i = j; i < (maxRow - 1) * maxCol; i++) {

        *pt_bitmap++ = *pt_scroll++;

    }

    /*

     * Blank characters are displayed on the last line.

     */

    for (i = 0; i < maxCol; i++) {

        *pt_bitmap++ = (short) (' ' | attribute);

    }

}

static void

endColumn(void)

{

    if (++row == maxRow) {

        scroll();       /* Scroll the screen now */

        row = maxRow - 1;

    }

    column = 0;

    nLines++;

    /* Move cursor on the next location  */

    wr_cursor(row * maxCol + column, ioCrtBaseAddr);

}

static void

videoPutChar(char car)

{

    unsigned short *pt_bitmap = bitMapBaseAddr + row * maxCol;

    switch (car) {

        case '\b': {

            if (column) column--;

            /* Move cursor on the previous location  */

            wr_cursor(row * maxCol + column, ioCrtBaseAddr);

            return;

        }

        case '\t': {

            int i;

            i = TAB_SPACE - (column & (TAB_SPACE - 1));

            pt_bitmap += column;

            column += i;

            if (column >= maxCol) {

                endColumn();

                return;

            }

            while (i--) *pt_bitmap++ = ' ' | attribute;

            wr_cursor(row * maxCol + column, ioCrtBaseAddr);

            return;

        }

        case '\n': {

            endColumn();

            return;

        }

        case 7: {       /* Bell code must be inserted here */

            return;

        }

        case '\r' : {   /* Already handled via \n */

            return;

        }

        default: {

            pt_bitmap += column;

            *pt_bitmap = car | attribute;

            if (++column == maxCol) endColumn();

            else wr_cursor(row * maxCol + column,

                          ioCrtBaseAddr);

            return;

        }

    }

}

void

clear_screen(void)

{

    int i,j;

    for (j = 0; j <= maxRow; j++) {

      for (i = 0; i <= maxCol; i++) {

        videoPutChar(' ');

      }

    }

    column  = 0;

    row     = 0;

}

/*-------------------------------------------------------------------------+

|         Function: _IBMPC_outch

|      Description: Higher level (console) interface to consPutc.

| Global Variables: None.

|        Arguments: c - character to write to console.

|          Returns: Nothing.

+--------------------------------------------------------------------------*/

void

_IBMPC_outch(char c)

{

  videoPutChar(c);

} /* _IBMPC_outch */

/*-------------------------------------------------------------------------+

|         Function: _IBMPC_initVideo

|      Description: Video system initialization. Hook for any early setup.

| Global Variables: bitMapBaseAddr, ioCrtBaseAddr, maxCol, maxRow, row

|                   column, attribute, nLines;

|        Arguments: None.

|          Returns: Nothing.

+--------------------------------------------------------------------------*/

void

_IBMPC_initVideo(void)

{

    unsigned char* pt = (unsigned char*) (VIDEO_MODE_ADDR);

    if (*pt == VGAMODE7) {

      bitMapBaseAddr = (unsigned short*) V_MONO;

    }

    else {

      bitMapBaseAddr = (unsigned short*) V_COLOR;

    }

    ioCrtBaseAddr = *(unsigned short*) DISPLAY_CRT_BASE_IO_ADDR;

    maxCol  = * (unsigned short*) NB_MAX_COL_ADDR;

    maxRow  = * (unsigned char*)  NB_MAX_ROW_ADDR;

    column  = 0;

    row     = 0;

    attribute = ((BLACK << 4) | WHITE)<<8;

    nLines = 0;

    clear_screen();

#ifdef DEBUG_EARLY_STAGE    

    printk("bitMapBaseAddr = %X, display controller base IO = %X\n",

           (unsigned) bitMapBaseAddr,

           (unsigned) ioCrtBaseAddr);

    videoPrintf("maxCol = %d, maxRow = %d\n", (unsigned) maxCol, (unsigned) maxRow);

#endif

} /* _IBMPC_initVideo */