Subversion Repositories HelenOS

Rev

Rev 2110 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2064 vana 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
2064 vana 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
/** @addtogroup ia32   
30
 * @{
31
 */
32
/**
33
 * @file
34
 * @brief EGA driver.
35
 */
36
 
37
#include <putchar.h>
38
#include <mm/page.h>
39
#include <mm/as.h>
40
#include <arch/mm/page.h>
41
#include <synch/spinlock.h>
42
#include <arch/types.h>
43
#include <arch/asm.h>
44
#include <memstr.h>
45
#include <console/chardev.h>
46
#include <console/console.h>
47
#include <sysinfo/sysinfo.h>
2110 jermar 48
#include <arch/drivers/ega.h>
2064 vana 49
 
50
/*
51
 * The EGA driver.
52
 * Simple and short. Function for displaying characters and "scrolling".
53
 */
54
 
55
SPINLOCK_INITIALIZE(egalock);
56
static uint32_t ega_cursor;
57
static uint8_t *videoram;
58
 
59
static void ega_putchar(chardev_t *d, const char ch);
60
 
61
chardev_t ega_console;
62
static chardev_operations_t ega_ops = {
63
    .write = ega_putchar
64
};
65
 
66
 
67
void ega_init(void)
68
{
69
    videoram = (uint8_t *) (VIDEORAM);
70
 
2110 jermar 71
    /*
72
     * Clear the screen.
73
     */
74
    _memsetw((uintptr_t) videoram, SCREEN, 0x0720);
75
 
2064 vana 76
    chardev_initialize("ega_out", &ega_console, &ega_ops);
77
    stdout = &ega_console;
78
 
79
    sysinfo_set_item_val("fb", NULL, true);
80
    sysinfo_set_item_val("fb.kind", NULL, 2);
81
    sysinfo_set_item_val("fb.width", NULL, ROW);
82
    sysinfo_set_item_val("fb.height", NULL, ROWS);
83
    sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
84
 
85
#ifndef CONFIG_FB
86
    putchar('\n');
87
#endif  
88
}
89
 
90
static void ega_display_char(char ch)
91
{
92
    videoram[ega_cursor * 2] = ch;
2110 jermar 93
    videoram[ega_cursor * 2 + 1] = 7;
2064 vana 94
}
95
 
96
/*
97
 * This function takes care of scrolling.
98
 */
99
static void ega_check_cursor(void)
100
{
101
    if (ega_cursor < SCREEN)
102
        return;
103
 
104
    memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
2110 jermar 105
    _memsetw((uintptr_t) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720);
2064 vana 106
    ega_cursor = ega_cursor - ROW;
107
}
108
 
109
void ega_putchar(chardev_t *d, const char ch)
110
{
111
    ipl_t ipl;
112
 
113
    ipl = interrupts_disable();
114
    spinlock_lock(&egalock);
115
 
116
    switch (ch) {
2065 jermar 117
    case '\n':
118
        ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
119
        break;
120
    case '\t':
121
        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
122
        break;
123
    case '\b':
124
        if (ega_cursor % ROW)
125
            ega_cursor--;
126
        break;
127
    default:
128
        ega_display_char(ch);
129
        ega_cursor++;
130
        break;
2064 vana 131
    }
132
    ega_check_cursor();
133
 
134
    spinlock_unlock(&egalock);
135
    interrupts_restore(ipl);
136
}
137
 
138
/** @}
139
 */