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annotate cos/kernel/video.c @ 9:92ace1ca50a8

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64 bits kernel without interrupts but with printf in C
author windel
date Sun, 13 Nov 2011 12:47:47 +0100
parents
children 6129643f5c34
rev   line source
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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1 #include "kernel.h"
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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2
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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3 #define VIDMEM 0xB8000
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4
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5 #define NUM_COLS 80
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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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
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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9 #define SCREEN_ATTR 0x0F
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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10
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11 static int row, col;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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12
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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13 void
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14 clear_screen()
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15 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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16 unsigned char *vidmem = (unsigned char *) VIDMEM;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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17 int loop;
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18
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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19 for (loop = 0; loop < SCREEN_SIZE; loop++) {
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20 *vidmem++ = 0x20;
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21 *vidmem++ = SCREEN_ATTR;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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22 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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23 }
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24
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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25 void
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26 init_screen()
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27 {
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28 row = col = 0;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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29 clear_screen();
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30 }
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31
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32
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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33 static void
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34 scroll_screen()
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35 {
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36 unsigned short* v;
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37 int i;
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38 int n = SCREEN_SIZE;
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39
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40 for (v = (unsigned short*) VIDMEM, i = 0; i < n; i++ ) {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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41 *v = *(v + NUM_COLS);
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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42 ++v;
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43 }
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44
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45 for (v = (unsigned short*) VIDMEM + n, i = 0; i < NUM_COLS; i++) {
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46 *v++ = SCREEN_ATTR & (0x20 << 8);
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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47 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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48 }
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49
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50 static void
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51 new_line()
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52 {
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53 ++row;
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54 col = 0;
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55 if (row == NUM_ROWS) {
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56 scroll_screen();
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57 row = NUM_ROWS - 1;
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58 }
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59 }
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60
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61 static void
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62 clear_to_EOL()
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63 {
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64 int loop;
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65 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2));
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66
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67 for (loop = col; loop < NUM_COLS; loop++) {
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68 *v++ = ' ';
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69 *v++ = SCREEN_ATTR;
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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 print_char(int c)
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75 {
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76 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2));
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77
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78 switch(c) {
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79 case '\n':
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80 clear_to_EOL();
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81 new_line();
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82 break;
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83 default:
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84 *v++ = (unsigned char) c;
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85 *v = SCREEN_ATTR;
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86
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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87 if (col < NUM_COLS - 1)
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88 ++col;
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89 else
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90 new_line();
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91 }
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92 }
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93
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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94 void
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95 print_string(const char *s)
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96 {
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97 while (*s != '\0') {
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98 print_char(*s++);
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99 }
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100 }
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101