Mercurial > lcfOS

comparison cos/kernel/video.c @ 23:5dd47d6eebac

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added ubersimple malloc algorithm
author windel
date Thu, 01 Dec 2011 21:42:59 +0100
parents 6129643f5c34
children d8627924d40d
comparison
equal deleted inserted replaced
22:69bc6d477b38 23:5dd47d6eebac
4 4
5 #define NUM_COLS 80 5 #define NUM_COLS 80
6 #define NUM_ROWS 25 6 #define NUM_ROWS 25
7 #define SCREEN_SIZE (NUM_COLS * NUM_ROWS) 7 #define SCREEN_SIZE (NUM_COLS * NUM_ROWS)
8 8
9 #define SCREEN_ATTR 0x0F
10
11 static int row, col; 9 static int row, col;
10 uint8_t video_color = 0x1F;
12 11
13 void move_cursor() 12 void move_cursor()
14 { 13 {
15 uint16_t cursorLocation = row * 80 + col; 14 uint16_t cursorLocation = row * 80 + col;
16 outb(0x3D4, 14); 15 outb(0x3D4, 14);
25 unsigned char *vidmem = (unsigned char *) VIDMEM; 24 unsigned char *vidmem = (unsigned char *) VIDMEM;
26 int loop; 25 int loop;
27 26
28 for (loop = 0; loop < SCREEN_SIZE; loop++) { 27 for (loop = 0; loop < SCREEN_SIZE; loop++) {
29 *vidmem++ = 0x20; 28 *vidmem++ = 0x20;
30 *vidmem++ = SCREEN_ATTR; 29 *vidmem++ = video_color;
31 } 30 }
32 } 31 }
33 32
34 void 33 void
35 init_screen() 34 init_screen()
51 *v = *(v + NUM_COLS); 50 *v = *(v + NUM_COLS);
52 ++v; 51 ++v;
53 } 52 }
54 53
55 for (v = (unsigned short*) VIDMEM + n, i = 0; i < NUM_COLS; i++) { 54 for (v = (unsigned short*) VIDMEM + n, i = 0; i < NUM_COLS; i++) {
56 *v++ = SCREEN_ATTR & (0x20 << 8); 55 *v++ = (video_color << 8) & 0x20;
57 } 56 }
58 } 57 }
59 58
60 static void 59 static void
61 new_line() 60 new_line()
74 int loop; 73 int loop;
75 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2)); 74 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2));
76 75
77 for (loop = col; loop < NUM_COLS; loop++) { 76 for (loop = col; loop < NUM_COLS; loop++) {
78 *v++ = ' '; 77 *v++ = ' ';
79 *v++ = SCREEN_ATTR; 78 *v++ = video_color;
80 } 79 }
81 } 80 }
82 81
83 static void 82 static void
84 print_char(int c) 83 print_char(int c)
90 clear_to_EOL(); 89 clear_to_EOL();
91 new_line(); 90 new_line();
92 break; 91 break;
93 default: 92 default:
94 *v++ = (unsigned char) c; 93 *v++ = (unsigned char) c;
95 *v = SCREEN_ATTR; 94 *v = video_color;
96 95
97 if (col < NUM_COLS - 1) 96 if (col < NUM_COLS - 1)
98 ++col; 97 ++col;
99 else 98 else
100 new_line(); 99 new_line();