Rev 106 | Rev 167 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
||
3 | * All rights reserved. |
||
4 | * |
||
5 | * Redistribution and use in source and binary forms, with or without |
||
6 | * modification, are permitted provided that the following conditions |
||
7 | * are met: |
||
8 | * |
||
9 | * - Redistributions of source code must retain the above copyright |
||
10 | * notice, this list of conditions and the following disclaimer. |
||
11 | * - Redistributions in binary form must reproduce the above copyright |
||
12 | * notice, this list of conditions and the following disclaimer in the |
||
13 | * documentation and/or other materials provided with the distribution. |
||
14 | * - The name of the author may not be used to endorse or promote products |
||
15 | * derived from this software without specific prior written permission. |
||
16 | * |
||
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
27 | */ |
||
28 | |||
29 | #include <arch/ega.h> |
||
30 | #include <putchar.h> |
||
31 | #include <mm/page.h> |
||
32 | #include <synch/spinlock.h> |
||
33 | #include <arch/types.h> |
||
34 | #include <arch/asm.h> |
||
35 | |||
36 | /* |
||
37 | * The EGA driver. |
||
38 | * Simple and short. Function for displaying characters and "scrolling". |
||
39 | */ |
||
40 | |||
41 | static spinlock_t egalock; |
||
42 | static __u32 ega_cursor; |
||
43 | |||
44 | void ega_move_cursor(void); |
||
45 | |||
46 | void ega_init(void) |
||
47 | { |
||
48 | __u8 hi, lo; |
||
49 | |||
106 | jermar | 50 | map_page_to_frame(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0); |
1 | jermar | 51 | outb(0x3d4,0xe); |
52 | hi = inb(0x3d5); |
||
53 | outb(0x3d4,0xf); |
||
54 | lo = inb(0x3d5); |
||
55 | ega_cursor = (hi<<8)|lo; |
||
56 | ega_putchar('\n'); |
||
57 | } |
||
58 | |||
59 | void ega_display_char(char ch) |
||
60 | { |
||
106 | jermar | 61 | __u8 *vram = (__u8 *) PA2KA(VIDEORAM); |
1 | jermar | 62 | |
63 | vram[ega_cursor*2] = ch; |
||
64 | } |
||
65 | |||
66 | /* |
||
67 | * This function takes care of scrolling. |
||
68 | */ |
||
69 | void ega_check_cursor(void) |
||
70 | { |
||
71 | if (ega_cursor < SCREEN) |
||
125 | jermar | 72 | return; |
1 | jermar | 73 | |
106 | jermar | 74 | memcopy(PA2KA(VIDEORAM) + ROW*2, PA2KA(VIDEORAM), (SCREEN - ROW)*2); |
75 | memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720); |
||
1 | jermar | 76 | ega_cursor = ega_cursor - ROW; |
77 | } |
||
78 | |||
63 | decky | 79 | void ega_putchar(const char ch) |
1 | jermar | 80 | { |
81 | pri_t pri; |
||
82 | |||
83 | pri = cpu_priority_high(); |
||
84 | spinlock_lock(&egalock); |
||
85 | |||
86 | switch (ch) { |
||
87 | case '\n': |
||
125 | jermar | 88 | ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
89 | break; |
||
1 | jermar | 90 | case '\t': |
125 | jermar | 91 | ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
92 | break; |
||
1 | jermar | 93 | default: |
125 | jermar | 94 | ega_display_char(ch); |
95 | ega_cursor++; |
||
96 | break; |
||
1 | jermar | 97 | } |
98 | ega_check_cursor(); |
||
99 | ega_move_cursor(); |
||
125 | jermar | 100 | |
1 | jermar | 101 | spinlock_unlock(&egalock); |
102 | cpu_priority_restore(pri); |
||
103 | } |
||
104 | |||
105 | void ega_move_cursor(void) |
||
106 | { |
||
107 | outb(0x3d4,0xe); |
||
108 | outb(0x3d5,(ega_cursor>>8)&0xff); |
||
109 | outb(0x3d4,0xf); |
||
110 | outb(0x3d5,ega_cursor&0xff); |
||
111 | } |
||
112 | |||
63 | decky | 113 | void putchar(const char ch) |
1 | jermar | 114 | { |
115 | ega_putchar(ch); |
||
116 | } |