1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #include <go32.h> |
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6 | #include <bsp.h> |
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7 | |
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8 | #include <string.h> |
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9 | #include <unistd.h> |
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10 | |
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11 | #define MAX_COL 80 |
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12 | #define MAX_ROW 50 |
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13 | |
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14 | static unsigned nrow = 25; |
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15 | static unsigned ncol = 80; |
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16 | static unsigned short * tvram = TVRAM; |
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17 | static unsigned char current_col = 0; |
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18 | static unsigned char current_row = 0; |
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19 | static unsigned short screen_copy[ MAX_ROW*MAX_COL ]; |
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20 | |
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21 | static void init_cons( void ); |
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22 | |
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23 | /* |
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24 | * set_cursor_pos() |
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25 | * Set cursor position based on current absolute screen offset |
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26 | */ |
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27 | static void |
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28 | set_cursor_pos(void) |
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29 | { |
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30 | register unsigned short gdc_pos = current_row * ncol + current_col; |
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31 | outport_byte( GDC_REG_PORT, 0xe ); |
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32 | outport_byte( GDC_VAL_PORT, (gdc_pos >> 8) & 0xff ); |
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33 | outport_byte( GDC_REG_PORT, 0xf ); |
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34 | outport_byte( GDC_VAL_PORT, gdc_pos & 0xff ); |
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35 | } |
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36 | |
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37 | /* |
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38 | * scroll_up() |
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39 | * Scroll screen up one line |
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40 | */ |
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41 | static void |
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42 | scroll_up( unsigned short * tv, unsigned short * copy, unsigned int lines ) |
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43 | { |
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44 | if ( lines > nrow ) |
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45 | lines = nrow; |
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46 | |
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47 | /* move everything up */ |
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48 | memmove( copy, copy+ncol*lines, (nrow-lines)*ncol*sizeof copy[0] ); |
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49 | |
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50 | /* fill bottom with blanks */ |
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51 | { |
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52 | int loop = ncol*lines; |
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53 | unsigned short * ptr = copy + ncol*(nrow-lines); |
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54 | while ( --loop >= 0 ) |
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55 | *ptr++ = (WHITE<<8) | ' '; |
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56 | } |
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57 | |
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58 | /* copy new screen to video buffer */ |
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59 | dosmemput( copy, nrow*ncol*sizeof copy[0], (int)tv ); |
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60 | } |
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61 | |
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62 | |
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63 | /* |
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64 | * PUT() |
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65 | * Write character at current screen location |
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66 | */ |
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67 | inline static void PUT( char c ) |
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68 | { |
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69 | unsigned short loc = current_row*ncol+current_col; |
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70 | unsigned short val = (WHITE<<8) | c; |
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71 | screen_copy[loc] = val; |
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72 | dosmemput( &screen_copy[loc], sizeof screen_copy[0], (int)(tvram+loc) ); |
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73 | } |
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74 | |
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75 | /* |
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76 | * cons_putc() |
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77 | * Place a character on next screen position |
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78 | */ |
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79 | static void |
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80 | cons_putc( unsigned char c ) |
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81 | { |
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82 | static int first = 1; |
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83 | if ( first ) { |
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84 | init_cons(); |
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85 | first = 0; |
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86 | } |
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87 | |
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88 | switch (c) { |
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89 | case '\t': |
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90 | while ( current_row % 8 ) |
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91 | cons_putc(' '); |
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92 | break; |
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93 | case '\r': |
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94 | current_col = 0; |
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95 | break; |
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96 | case '\n': |
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97 | if ( ++current_row >= nrow ) { |
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98 | scroll_up( tvram, screen_copy, 1 ); |
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99 | current_row -= 1; |
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100 | } |
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101 | break; |
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102 | case '\b': |
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103 | if ( current_col > 0 ) { |
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104 | --current_col; |
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105 | PUT(' '); |
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106 | } |
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107 | break; |
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108 | default: |
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109 | PUT(c); |
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110 | current_col += 1; |
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111 | if ( current_col >= ncol ) { |
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112 | current_col = 0; |
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113 | current_row += 1; |
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114 | if ( current_row >= nrow ) { |
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115 | scroll_up( tvram, screen_copy, 1 ); |
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116 | current_row -= 1; |
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117 | } |
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118 | } |
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119 | }; |
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120 | set_cursor_pos(); |
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121 | } |
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122 | |
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123 | |
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124 | /* |
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125 | * init_cons() |
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126 | * Hook for any early setup |
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127 | */ |
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128 | static void |
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129 | init_cons( void ) |
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130 | { |
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131 | #if 0 |
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132 | /* Get a copy of original screen */ |
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133 | dosmemget( (int)tvram, nrow*ncol*sizeof *tvram, screen_copy ); |
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134 | #else |
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135 | /* Clear entire screen */ |
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136 | scroll_up( tvram, screen_copy, nrow ); |
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137 | #endif |
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138 | } |
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139 | |
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140 | |
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141 | |
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142 | void _IBMPC_outch( unsigned char ch ) |
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143 | { |
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144 | extern int _IBMPC_Use_Go32_IO; |
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145 | |
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146 | if ( _IBMPC_Use_Go32_IO ) { |
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147 | write( 1, &ch, 1 ); |
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148 | } else { |
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149 | cons_putc( ch ); |
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150 | } |
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151 | } |
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