Subversion Repositories HelenOS

Rev

Rev 588 | Rev 687 | 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>
167 jermar 32
#include <arch/mm/page.h>
1 jermar 33
#include <synch/spinlock.h>
34
#include <arch/types.h>
35
#include <arch/asm.h>
195 vana 36
#include <memstr.h>
575 palkovsky 37
#include <console/chardev.h>
38
#include <console/console.h>
1 jermar 39
 
40
/*
41
 * The EGA driver.
42
 * Simple and short. Function for displaying characters and "scrolling".
43
 */
44
 
623 jermar 45
SPINLOCK_INITIALIZE(egalock);
1 jermar 46
static __u32 ega_cursor;
47
 
575 palkovsky 48
static void ega_putchar(chardev_t *d, const char ch);
49
 
50
chardev_t ega_console;
51
static chardev_operations_t ega_ops = {
52
    .write = ega_putchar
53
};
54
 
1 jermar 55
void ega_move_cursor(void);
56
 
57
void ega_init(void)
58
{
59
    __u8 hi, lo;
60
 
492 jermar 61
    page_mapping_insert(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0);
1 jermar 62
    outb(0x3d4,0xe);
63
    hi = inb(0x3d5);
64
    outb(0x3d4,0xf);
65
    lo = inb(0x3d5);
66
    ega_cursor = (hi<<8)|lo;
575 palkovsky 67
 
68
    chardev_initialize("ega_out", &ega_console, &ega_ops);
69
    stdout = &ega_console;
70
 
71
    putchar('\n');
1 jermar 72
}
73
 
452 decky 74
static void ega_display_char(char ch)
1 jermar 75
{
106 jermar 76
    __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
1 jermar 77
 
78
    vram[ega_cursor*2] = ch;
79
}
80
 
81
/*
82
 * This function takes care of scrolling.
83
 */
452 decky 84
static void ega_check_cursor(void)
1 jermar 85
{
86
    if (ega_cursor < SCREEN)
125 jermar 87
        return;
1 jermar 88
 
205 jermar 89
    memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
106 jermar 90
    memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
1 jermar 91
    ega_cursor = ega_cursor - ROW;
92
}
93
 
575 palkovsky 94
void ega_putchar(chardev_t *d, const char ch)
1 jermar 95
{
413 jermar 96
    ipl_t ipl;
1 jermar 97
 
413 jermar 98
    ipl = interrupts_disable();
1 jermar 99
    spinlock_lock(&egalock);
100
 
101
    switch (ch) {
588 palkovsky 102
    case '\n':
125 jermar 103
        ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
104
        break;
588 palkovsky 105
    case '\t':
125 jermar 106
        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
107
        break;
588 palkovsky 108
    case '\b':
109
        if (ega_cursor % ROW)
110
            ega_cursor--;
111
        break;
112
    default:
125 jermar 113
        ega_display_char(ch);
114
        ega_cursor++;
115
        break;
1 jermar 116
        }
117
    ega_check_cursor();
118
    ega_move_cursor();
125 jermar 119
 
1 jermar 120
    spinlock_unlock(&egalock);
413 jermar 121
    interrupts_restore(ipl);
1 jermar 122
}
123
 
124
void ega_move_cursor(void)
125
{
126
    outb(0x3d4,0xe);
127
    outb(0x3d5,(ega_cursor>>8)&0xff);
128
    outb(0x3d4,0xf);
129
    outb(0x3d5,ega_cursor&0xff);   
130
}