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annotate cos/kernel/video.c @ 299:674789d9ff37

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Added a doc
author Windel Bouwman
date Sun, 01 Dec 2013 18:37:23 +0100
parents d8627924d40d
children
rev   line source
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1 #include "kernel.h"
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2
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3 #define VIDMEM 0xB8000
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4
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5 #define NUM_COLS 80
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6 #define NUM_ROWS 25
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7 #define SCREEN_SIZE (NUM_COLS * NUM_ROWS)
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8
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9 static int row, col;
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10 uint8_t video_color = 0x1F;
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11
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12 void move_cursor()
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13 {
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14 uint16_t cursorLocation = row * 80 + col;
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15 outb(0x3D4, 14);
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16 outb(0x3D5, cursorLocation >> 8);
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17 outb(0x3D4, 15);
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18 outb(0x3D5, cursorLocation & 0xFF);
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19 }
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20
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21 void set_cursor(int newrow, int newcol)
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22 {
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23 row = newrow;
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24 col = newcol;
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25 move_cursor();
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26 }
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27
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28 void get_cursor(int *therow, int *thecol)
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29 {
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30 *therow = row;
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31 *thecol = col;
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32 }
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33
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34 void set_color(int forecolor, int backcolor)
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35 {
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36 video_color = forecolor | (backcolor << 4);
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37 }
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38
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39 void clear_screen()
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40 {
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41 unsigned char *vidmem = (unsigned char *) VIDMEM;
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42 int loop;
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43
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44 for (loop = 0; loop < SCREEN_SIZE; loop++) {
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45 *vidmem++ = 0x20;
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46 *vidmem++ = video_color;
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47 }
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48 }
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49
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50 void init_screen()
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51 {
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52 clear_screen();
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53 set_cursor(0, 0);
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54 }
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55
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56 static void scroll_screen()
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57 {
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58 uint8_t* v;
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59 int i;
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60
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61 // Shift all lines one up:
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62 v = (uint8_t*)VIDMEM;
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63 for (i = 0; i < SCREEN_SIZE; i++ )
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64 {
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65 *v = *(v + NUM_COLS*2);
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66 ++v;
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67 *v = *(v + NUM_COLS*2);
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68 ++v;
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69 }
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70
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71 // Clear new line:
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72 v = (uint8_t*)VIDMEM + SCREEN_SIZE * 2 - NUM_COLS * 2;
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73 for (i = 0; i < NUM_COLS; i++)
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74 {
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75 *v++ = ' ';
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76 *v++ = video_color;
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77 }
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78 }
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79
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80 static void new_line()
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81 {
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82 ++row;
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83 col = 0;
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84 if (row == NUM_ROWS)
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85 {
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86 scroll_screen();
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87 row = NUM_ROWS - 1;
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88 }
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89 }
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90
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91 static void clear_to_EOL()
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92 {
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93 int loop;
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94 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2));
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96 for (loop = col; loop < NUM_COLS; loop++) {
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97 *v++ = ' ';
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98 *v++ = video_color;
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99 }
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100 }
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101
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102 static void print_char(int c)
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103 {
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104 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2));
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105
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106 switch(c) {
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107 case '\n':
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108 clear_to_EOL();
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109 new_line();
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110 break;
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111 default:
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112 *v++ = (unsigned char) c;
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113 *v = video_color;
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114
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115 if (col < NUM_COLS - 1)
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116 ++col;
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117 else
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118 new_line();
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119 }
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120 move_cursor();
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121 }
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122
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123 void print_string(const char *s)
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124 {
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125 while (*s != '\0')
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126 {
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127 print_char(*s++);
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128 }
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129 }
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130