1 | /* |
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2 | * outch.c - This file contains code for displaying characters |
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3 | * on the console uisng information that should be |
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4 | * maintained by the BIOS in its data Area. |
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5 | * |
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6 | * Copyright (C) 1998 Eric Valette (valette@crf.canon.fr) |
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7 | * Canon Centre Recherche France. |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | |
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17 | #include <bsp.h> |
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18 | |
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19 | #include <stdlib.h> |
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20 | #include <string.h> |
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21 | |
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22 | #include <crt.h> |
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23 | |
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24 | extern void wr_cursor(int, unsigned short); |
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25 | |
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26 | #define TAB_SPACE 4 |
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27 | static unsigned short *bitMapBaseAddr; |
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28 | static unsigned short ioCrtBaseAddr; |
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29 | static unsigned short maxCol; |
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30 | static unsigned short maxRow; |
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31 | static unsigned char row; |
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32 | static unsigned char column; |
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33 | static unsigned short attribute; |
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34 | static unsigned int nLines; |
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35 | |
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36 | static void |
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37 | scroll(void) |
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38 | { |
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39 | int i, j; /* Counters */ |
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40 | unsigned short *pt_scroll, *pt_bitmap; /* Pointers on the bit-map */ |
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41 | |
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42 | pt_bitmap = bitMapBaseAddr; |
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43 | j = 0; |
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44 | pt_bitmap = pt_bitmap + j; |
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45 | pt_scroll = pt_bitmap + maxCol; |
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46 | for (i = j; i < (maxRow - 1) * maxCol; i++) { |
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47 | *pt_bitmap++ = *pt_scroll++; |
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48 | } |
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49 | |
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50 | /* |
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51 | * Blank characters are displayed on the last line. |
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52 | */ |
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53 | for (i = 0; i < maxCol; i++) { |
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54 | *pt_bitmap++ = (short) (' ' | attribute); |
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55 | } |
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56 | } |
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57 | |
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58 | static void |
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59 | endColumn(void) |
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60 | { |
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61 | if (++row == maxRow) { |
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62 | scroll(); /* Scroll the screen now */ |
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63 | row = maxRow - 1; |
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64 | } |
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65 | column = 0; |
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66 | nLines++; |
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67 | /* Move cursor on the next location */ |
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68 | wr_cursor(row * maxCol + column, ioCrtBaseAddr); |
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69 | } |
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70 | |
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71 | |
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72 | |
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73 | static void |
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74 | videoPutChar(char car) |
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75 | { |
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76 | unsigned short *pt_bitmap = bitMapBaseAddr + row * maxCol; |
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77 | |
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78 | switch (car) { |
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79 | case '\b': { |
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80 | if (column) column--; |
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81 | /* Move cursor on the previous location */ |
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82 | wr_cursor(row * maxCol + column, ioCrtBaseAddr); |
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83 | return; |
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84 | } |
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85 | case '\t': { |
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86 | int i; |
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87 | |
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88 | i = TAB_SPACE - (column & (TAB_SPACE - 1)); |
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89 | pt_bitmap += column; |
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90 | column += i; |
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91 | if (column >= maxCol) { |
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92 | endColumn(); |
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93 | return; |
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94 | } |
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95 | while (i--) *pt_bitmap++ = ' ' | attribute; |
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96 | wr_cursor(row * maxCol + column, ioCrtBaseAddr); |
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97 | return; |
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98 | } |
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99 | case '\n': { |
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100 | endColumn(); |
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101 | return; |
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102 | } |
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103 | case 7: { /* Bell code must be inserted here */ |
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104 | return; |
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105 | } |
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106 | case '\r' : { /* Already handled via \n */ |
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107 | return; |
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108 | } |
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109 | default: { |
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110 | pt_bitmap += column; |
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111 | *pt_bitmap = car | attribute; |
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112 | if (++column == maxCol) endColumn(); |
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113 | else wr_cursor(row * maxCol + column, |
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114 | ioCrtBaseAddr); |
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115 | return; |
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116 | } |
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117 | } |
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118 | } |
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119 | |
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120 | void |
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121 | clear_screen(void) |
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122 | { |
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123 | int i,j; |
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124 | |
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125 | for (j = 0; j <= maxRow; j++) { |
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126 | for (i = 0; i <= maxCol; i++) { |
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127 | videoPutChar(' '); |
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128 | } |
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129 | } |
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130 | column = 0; |
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131 | row = 0; |
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132 | } |
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133 | |
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134 | /*-------------------------------------------------------------------------+ |
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135 | | Function: _IBMPC_outch |
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136 | | Description: Higher level (console) interface to consPutc. |
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137 | | Global Variables: None. |
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138 | | Arguments: c - character to write to console. |
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139 | | Returns: Nothing. |
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140 | +--------------------------------------------------------------------------*/ |
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141 | void |
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142 | _IBMPC_outch(char c) |
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143 | { |
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144 | videoPutChar(c); |
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145 | } /* _IBMPC_outch */ |
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146 | |
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147 | |
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148 | /*-------------------------------------------------------------------------+ |
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149 | | Function: _IBMPC_initVideo |
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150 | | Description: Video system initialization. Hook for any early setup. |
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151 | | Global Variables: bitMapBaseAddr, ioCrtBaseAddr, maxCol, maxRow, row |
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152 | | column, attribute, nLines; |
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153 | | Arguments: None. |
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154 | | Returns: Nothing. |
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155 | +--------------------------------------------------------------------------*/ |
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156 | void |
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157 | _IBMPC_initVideo(void) |
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158 | { |
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159 | unsigned char* pt = (unsigned char*) (VIDEO_MODE_ADDR); |
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160 | |
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161 | if (*pt == VGAMODE7) { |
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162 | bitMapBaseAddr = (unsigned short*) V_MONO; |
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163 | } |
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164 | else { |
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165 | bitMapBaseAddr = (unsigned short*) V_COLOR; |
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166 | } |
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167 | ioCrtBaseAddr = *(unsigned short*) DISPLAY_CRT_BASE_IO_ADDR; |
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168 | maxCol = * (unsigned short*) NB_MAX_COL_ADDR; |
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169 | maxRow = * (unsigned char*) NB_MAX_ROW_ADDR; |
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170 | column = 0; |
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171 | row = 0; |
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172 | attribute = ((BLACK << 4) | WHITE)<<8; |
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173 | nLines = 0; |
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174 | clear_screen(); |
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175 | #ifdef DEBUG_EARLY_STAGE |
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176 | printk("bitMapBaseAddr = %X, display controller base IO = %X\n", |
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177 | (unsigned) bitMapBaseAddr, |
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178 | (unsigned) ioCrtBaseAddr); |
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179 | videoPrintf("maxCol = %d, maxRow = %d\n", (unsigned) maxCol, (unsigned) maxRow); |
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180 | #endif |
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181 | } /* _IBMPC_initVideo */ |
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182 | |
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183 | |
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184 | /* for old DOS compatibility n-curses type of applications */ |
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185 | void gotoxy( int x, int y ) |
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186 | { |
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187 | row = x; |
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188 | column = y; |
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189 | wr_cursor(row * maxCol + column, ioCrtBaseAddr); |
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190 | } |
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191 | |
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192 | |
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193 | int whereX( void ) |
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194 | { |
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195 | return row; |
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196 | } |
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197 | |
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198 | int whereY( void ) |
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199 | { |
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200 | return column; |
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201 | } |
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202 | |
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