Mercurial > lcfOS

annotate 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
rev   line source
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
1 #include "kernel.h"
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
2
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
3 #define VIDMEM 0xB8000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
5 #define NUM_COLS 80
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
6 #define NUM_ROWS 25
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
7 #define SCREEN_SIZE (NUM_COLS * NUM_ROWS)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
8
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
9 static int row, col;
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 18
diff changeset
10 uint8_t video_color = 0x1F;
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
11
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
12 void move_cursor()
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
13 {
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
14 uint16_t cursorLocation = row * 80 + col;
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
15 outb(0x3D4, 14);
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
16 outb(0x3D5, cursorLocation >> 8);
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
17 outb(0x3D4, 15);
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
18 outb(0x3D5, cursorLocation & 0xFF);
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
19 }
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
20
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
21 void
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
22 clear_screen()
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
23 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
24 unsigned char *vidmem = (unsigned char *) VIDMEM;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
25 int loop;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
26
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
27 for (loop = 0; loop < SCREEN_SIZE; loop++) {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
28 *vidmem++ = 0x20;
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 18
diff changeset
29 *vidmem++ = video_color;
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
30 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
31 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
32
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
33 void
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
34 init_screen()
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
35 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
36 row = col = 0;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
37 clear_screen();
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
38 move_cursor();
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
39 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
40
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
41
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
42 static void
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
43 scroll_screen()
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
44 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
45 unsigned short* v;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
46 int i;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
47 int n = SCREEN_SIZE;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
48
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
49 for (v = (unsigned short*) VIDMEM, i = 0; i < n; i++ ) {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
50 *v = *(v + NUM_COLS);
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
51 ++v;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
52 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
53
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
54 for (v = (unsigned short*) VIDMEM + n, i = 0; i < NUM_COLS; i++) {
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 18
diff changeset
55 *v++ = (video_color << 8) & 0x20;
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
56 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
57 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
58
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
59 static void
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
60 new_line()
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
61 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
62 ++row;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
63 col = 0;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
64 if (row == NUM_ROWS) {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
65 scroll_screen();
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
66 row = NUM_ROWS - 1;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
67 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
68 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
69
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
70 static void
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
71 clear_to_EOL()
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
72 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
73 int loop;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
74 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2));
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
75
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
76 for (loop = col; loop < NUM_COLS; loop++) {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
77 *v++ = ' ';
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 18
diff changeset
78 *v++ = video_color;
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
79 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
80 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
81
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
82 static void
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
83 print_char(int c)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
84 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
85 unsigned char *v = (unsigned char *) ((uint64_t)(VIDMEM + row * NUM_COLS * 2 + col * 2));
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
86
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
87 switch(c) {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
88 case '\n':
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
89 clear_to_EOL();
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
90 new_line();
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
91 break;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
92 default:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
93 *v++ = (unsigned char) c;
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 18
diff changeset
94 *v = video_color;
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
95
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
96 if (col < NUM_COLS - 1)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
97 ++col;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
98 else
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
99 new_line();
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
100 }
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 9
diff changeset
101 move_cursor();
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
102 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
103
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
104 void
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
105 print_string(const char *s)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
106 {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
107 while (*s != '\0') {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
108 print_char(*s++);
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
109 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
110 }
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
111