1 | /* |
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2 | * This file contains the TTY driver for VGA |
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3 | * |
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4 | * COPYRIGHT (c) 1998 by Radstone Technology |
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5 | * |
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6 | * |
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7 | * THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY |
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8 | * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE |
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9 | * IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK |
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10 | * AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU. |
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11 | * |
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12 | * You are hereby granted permission to use, copy, modify, and distribute |
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13 | * this file, provided that this notice, plus the above copyright notice |
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14 | * and disclaimer, appears in all copies. Radstone Technology will provide |
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15 | * no support for this code. |
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16 | * |
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17 | * This driver uses the termios pseudo driver. |
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18 | */ |
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19 | /*-------------------------------------------------------------------------+ |
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20 | | (C) Copyright 1997 - |
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21 | | - NavIST Group - Real-Time Distributed Systems and Industrial Automation |
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22 | | |
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23 | | http://pandora.ist.utl.pt |
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24 | | |
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25 | | Instituto Superior Tecnico * Lisboa * PORTUGAL |
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26 | +--------------------------------------------------------------------------+ |
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27 | | Disclaimer: |
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28 | | |
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29 | | This file is provided "AS IS" without warranty of any kind, either |
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30 | | expressed or implied. |
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31 | +--------------------------------------------------------------------------+ |
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32 | | This code is based on: |
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33 | | outch.c,v 1.4 1995/12/19 20:07:27 joel Exp - go32 BSP |
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34 | | With the following copyright notice: |
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35 | | ************************************************************************** |
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36 | | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. * |
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37 | | * On-Line Applications Research Corporation (OAR). * |
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38 | | ************************************************************************** |
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39 | +--------------------------------------------------------------------------*/ |
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40 | |
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41 | |
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42 | #include <bsp.h> |
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43 | |
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44 | #include <stdlib.h> |
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45 | #include <string.h> |
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46 | |
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47 | #include "vga_p.h" |
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48 | |
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49 | /*-------------------------------------------------------------------------+ |
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50 | | Constants |
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51 | +--------------------------------------------------------------------------*/ |
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52 | #define DISPLAY_CELL_COUNT (VGA_NUM_ROWS * VGA_NUM_COLS) |
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53 | /* Number of display cells. */ |
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54 | #define TABSIZE 4 /* Number of spaces for TAB (\t) char. */ |
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55 | #define WHITE 0x0007 /* White on Black background colour. */ |
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56 | #define BLANK (WHITE | (' '<<8)) /* Blank character. */ |
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57 | |
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58 | /* |
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59 | * This is imported from i8042.c to provide flow control |
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60 | */ |
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61 | extern volatile boolean bScrollLock; |
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62 | |
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63 | /*-------------------------------------------------------------------------+ |
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64 | | Global Variables |
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65 | +--------------------------------------------------------------------------*/ |
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66 | /* Physical address of start of video text memory. */ |
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67 | static unsigned16 *videoRam = (unsigned16 *)VGA_FB; |
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68 | /* Pointer for current output position in display. */ |
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69 | static unsigned16 *videoRamPtr = (unsigned16 *)VGA_FB; |
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70 | static unsigned8 videoRows = VGA_NUM_ROWS; /* Number of rows in display. */ |
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71 | static unsigned8 videoCols = VGA_NUM_COLS; /* Number of columns in display. */ |
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72 | static unsigned8 cursRow = 0; /* Current cursor row. */ |
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73 | static unsigned8 cursCol = 0; /* Current cursor column. */ |
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74 | |
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75 | |
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76 | /*-------------------------------------------------------------------------+ |
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77 | | Function: setHardwareCursorPos |
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78 | | Description: Set hardware video cursor at given offset into video RAM. |
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79 | | Global Variables: None. |
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80 | | Arguments: videoCursor - Offset into video memory. |
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81 | | Returns: Nothing. |
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82 | +--------------------------------------------------------------------------*/ |
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83 | static inline void |
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84 | setHardwareCursorPos(unsigned16 videoCursor) |
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85 | { |
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86 | VGA_WRITE_CRTC(0x0e, (videoCursor >> 8) & 0xff); |
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87 | VGA_WRITE_CRTC(0x0f, videoCursor & 0xff); |
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88 | } /* setHardwareCursorPos */ |
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89 | |
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90 | |
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91 | /*-------------------------------------------------------------------------+ |
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92 | | Function: updateVideoRamPtr |
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93 | | Description: Updates value of global variable "videoRamPtr" based on |
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94 | | current window's cursor position. |
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95 | | Global Variables: videoRamPtr, cursRow, cursCol. |
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96 | | Arguments: None. |
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97 | | Returns: Nothing. |
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98 | +--------------------------------------------------------------------------*/ |
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99 | static inline void |
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100 | updateVideoRamPtr(void) |
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101 | { |
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102 | videoRamPtr = videoRam + cursRow * videoCols + cursCol; |
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103 | } /* updateVideoRamPtr */ |
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104 | |
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105 | |
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106 | /*-------------------------------------------------------------------------+ |
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107 | | Function: scrollUp |
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108 | | Description: Scrolls display up n lines. |
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109 | | Global Variables: None. |
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110 | | Arguments: lines - number of lines to scroll. |
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111 | | Returns: Nothing. |
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112 | +--------------------------------------------------------------------------*/ |
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113 | static void |
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114 | scrollUp(unsigned8 lines) |
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115 | { |
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116 | /* Number of blank display cells on bottom of window. */ |
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117 | unsigned16 blankCount; |
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118 | |
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119 | /* Source and destination pointers for memory copy operations. */ |
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120 | unsigned16 *ptrDst, *ptrSrc; |
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121 | |
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122 | if(lines<videoRows) /* Move window's contents up. */ |
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123 | { |
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124 | /* |
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125 | * Number of non-blank cells on upper part |
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126 | * of display (total - blank). |
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127 | */ |
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128 | unsigned16 nonBlankCount; |
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129 | |
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130 | blankCount = lines * videoCols; |
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131 | nonBlankCount = DISPLAY_CELL_COUNT - blankCount; |
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132 | ptrSrc = videoRam + blankCount; |
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133 | ptrDst = videoRam; |
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134 | |
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135 | while(nonBlankCount--) |
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136 | { |
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137 | *ptrDst++ = *ptrSrc++; |
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138 | } |
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139 | } |
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140 | else |
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141 | { |
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142 | /* |
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143 | * Clear the whole display. |
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144 | */ |
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145 | blankCount = DISPLAY_CELL_COUNT; |
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146 | ptrDst = videoRam; |
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147 | } |
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148 | |
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149 | /* Fill bottom with blanks. */ |
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150 | while (blankCount-->0) |
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151 | { |
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152 | *ptrDst++ = BLANK; |
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153 | } |
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154 | } /* scrollUp */ |
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155 | |
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156 | |
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157 | /*-------------------------------------------------------------------------+ |
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158 | | Function: printCHAR |
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159 | | Description: Print printable character to display. |
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160 | | Global Variables: videoRamPtr, cursRow, cursCol. |
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161 | | Arguments: c - character to write to display. |
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162 | | Returns: Nothing. |
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163 | +--------------------------------------------------------------------------*/ |
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164 | static void |
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165 | printCHAR(char c) |
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166 | { |
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167 | *videoRamPtr++ = (c<<8) | WHITE; |
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168 | cursCol++; |
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169 | if(cursCol==videoCols) |
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170 | { |
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171 | cursCol = 0; |
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172 | cursRow++; |
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173 | if(cursRow==videoRows) |
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174 | { |
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175 | cursRow--; |
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176 | scrollUp(1); |
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177 | videoRamPtr -= videoCols; |
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178 | } |
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179 | } |
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180 | } /* printCHAR */ |
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181 | |
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182 | /*-------------------------------------------------------------------------+ |
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183 | | Function: printBS |
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184 | | Description: Print BS (BackSpace - '\b') character to display. |
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185 | | Global Variables: videoRamPtr, cursRow, cursCol. |
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186 | | Arguments: None. |
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187 | | Returns: Nothing. |
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188 | +--------------------------------------------------------------------------*/ |
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189 | static inline void |
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190 | printBS(void) |
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191 | { |
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192 | /* Move cursor back one cell. */ |
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193 | if(cursCol>0) |
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194 | { |
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195 | cursCol--; |
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196 | } |
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197 | else if(cursRow>0) |
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198 | { |
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199 | cursRow--; |
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200 | cursCol = videoCols - 1; |
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201 | } |
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202 | else |
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203 | { |
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204 | return; |
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205 | } |
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206 | |
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207 | /* Write a whitespace. */ |
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208 | *(--videoRamPtr) = BLANK; |
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209 | } /* printBS */ |
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210 | |
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211 | |
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212 | /*-------------------------------------------------------------------------+ |
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213 | | Function: printHT |
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214 | | Description: Print HT (Horizontal Tab - '\t') character to display. |
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215 | | Global Variables: cursCol. |
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216 | | Arguments: None. |
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217 | | Returns: Nothing. |
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218 | +--------------------------------------------------------------------------*/ |
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219 | static inline void |
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220 | printHT(void) |
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221 | { |
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222 | do |
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223 | { |
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224 | printCHAR(' '); |
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225 | } |
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226 | while (cursCol % TABSIZE); |
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227 | } /* printHT */ |
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228 | |
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229 | |
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230 | /*-------------------------------------------------------------------------+ |
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231 | | Function: printLF |
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232 | | Description: Print LF (Line Feed - '\n') character to display. |
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233 | | Global Variables: cursRow. |
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234 | | Arguments: None. |
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235 | | Returns: Nothing. |
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236 | +--------------------------------------------------------------------------*/ |
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237 | static inline void |
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238 | printLF(void) |
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239 | { |
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240 | cursRow++; |
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241 | if(cursRow==videoRows) |
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242 | { |
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243 | cursRow--; |
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244 | scrollUp(1); |
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245 | } |
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246 | updateVideoRamPtr(); |
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247 | } /* printLF */ |
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248 | |
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249 | |
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250 | /*-------------------------------------------------------------------------+ |
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251 | | Function: printCR |
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252 | | Description: Print CR (Carriage Return - '\r') to display. |
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253 | | Global Variables: cursCol. |
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254 | | Arguments: None. |
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255 | | Returns: Nothing. |
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256 | +--------------------------------------------------------------------------*/ |
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257 | static inline void |
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258 | printCR(void) |
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259 | { |
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260 | cursCol = 0; |
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261 | updateVideoRamPtr(); |
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262 | } /* printCR */ |
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263 | |
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264 | /* |
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265 | * Console Device Driver Entry Points |
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266 | */ |
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267 | void |
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268 | vga_write( |
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269 | int minor, |
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270 | char cChar) |
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271 | { |
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272 | switch (cChar) |
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273 | { |
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274 | case '\b': |
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275 | printBS(); |
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276 | break; |
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277 | case '\t': |
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278 | printHT(); |
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279 | break; |
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280 | case '\n': |
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281 | printLF(); |
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282 | break; |
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283 | case '\r': |
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284 | printCR(); |
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285 | break; |
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286 | default: |
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287 | printCHAR(cChar); |
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288 | break; |
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289 | } |
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290 | |
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291 | setHardwareCursorPos(videoRamPtr - videoRam); |
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292 | } /* vga_write */ |
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293 | |
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294 | /* |
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295 | * vga_write_support |
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296 | * |
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297 | * Console Termios output entry point. |
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298 | * |
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299 | */ |
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300 | int vga_write_support( |
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301 | int minor, |
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302 | const char *buf, |
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303 | int len |
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304 | ) |
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305 | { |
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306 | int nwrite = 0; |
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307 | |
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308 | while(bScrollLock) |
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309 | { |
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310 | /* |
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311 | * The Scroll lock on the keyboard is active |
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312 | */ |
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313 | /* |
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314 | * Yield while we wait |
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315 | */ |
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316 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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317 | } |
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318 | |
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319 | /* |
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320 | * Write each byte in the string to the display |
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321 | */ |
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322 | while (nwrite<len) |
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323 | { |
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324 | /* |
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325 | * transmit character |
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326 | */ |
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327 | vga_write(minor, *buf++); |
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328 | nwrite++; |
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329 | } |
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330 | |
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331 | /* |
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332 | * return the number of bytes written. |
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333 | */ |
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334 | return nwrite; |
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335 | } |
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336 | |
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337 | boolean vga_probe(int minor) |
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338 | { |
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339 | unsigned8 ucMiscIn; |
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340 | |
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341 | /* |
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342 | * Check for presence of VGA adaptor |
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343 | */ |
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344 | inport_byte(0x3cc, ucMiscIn); |
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345 | if(ucMiscIn!=0xff) |
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346 | { |
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347 | /* |
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348 | * VGA device is present |
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349 | */ |
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350 | return(TRUE); |
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351 | } |
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352 | return(FALSE); |
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353 | } |
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354 | |
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355 | void vga_init(int minor) |
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356 | { |
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357 | scrollUp(videoRows); /* Clear entire screen */ |
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358 | setHardwareCursorPos(0); /* Cursor at upper left corner */ |
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359 | /* |
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360 | * Enable the cursor |
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361 | */ |
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362 | VGA_WRITE_CRTC(0x0a, 0x0e); /* Crt cursor start */ |
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363 | } |
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