Subversion Repositories HelenOS

Rev

Rev 4055 | Rev 4296 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 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
 
3940 decky 29
/** @addtogroup genarch_drivers
1702 cejka 30
 * @{
31
 */
1754 jermar 32
/**
33
 * @file
34
 * @brief EGA driver.
1702 cejka 35
 */
36
 
3779 jermar 37
#include <genarch/drivers/ega/ega.h>
1 jermar 38
#include <putchar.h>
39
#include <mm/page.h>
755 jermar 40
#include <mm/as.h>
3751 svoboda 41
#include <mm/slab.h>
167 jermar 42
#include <arch/mm/page.h>
1 jermar 43
#include <synch/spinlock.h>
44
#include <arch/types.h>
45
#include <arch/asm.h>
195 vana 46
#include <memstr.h>
575 palkovsky 47
#include <console/chardev.h>
48
#include <console/console.h>
1473 decky 49
#include <sysinfo/sysinfo.h>
2015 jermar 50
#include <ddi/ddi.h>
1 jermar 51
 
52
/*
53
 * The EGA driver.
54
 * Simple and short. Function for displaying characters and "scrolling".
55
 */
56
 
623 jermar 57
SPINLOCK_INITIALIZE(egalock);
1780 jermar 58
static uint32_t ega_cursor;
59
static uint8_t *videoram;
3751 svoboda 60
static uint8_t *backbuf;
3930 jermar 61
static ioport8_t *ega_base;
1 jermar 62
 
4156 trochtova 63
#define SPACE  0x20
64
#define STYLE  0x07
3994 decky 65
 
4156 trochtova 66
#define EMPTY_CHAR  (STYLE << 8 | SPACE)
575 palkovsky 67
 
1 jermar 68
/*
69
 * This function takes care of scrolling.
70
 */
452 decky 71
static void ega_check_cursor(void)
1 jermar 72
{
3940 decky 73
    if (ega_cursor < EGA_SCREEN)
125 jermar 74
        return;
3994 decky 75
 
3940 decky 76
    memmove((void *) videoram, (void *) (videoram + EGA_COLS * 2),
77
        (EGA_SCREEN - EGA_COLS) * 2);
78
    memmove((void *) backbuf, (void *) (backbuf + EGA_COLS * 2),
79
        (EGA_SCREEN - EGA_COLS) * 2);
3994 decky 80
    memsetw(videoram + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, EMPTY_CHAR);
81
    memsetw(backbuf + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, EMPTY_CHAR);
3940 decky 82
    ega_cursor = ega_cursor - EGA_COLS;
1 jermar 83
}
84
 
3975 decky 85
static void ega_show_cursor(void)
86
{
87
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
88
    uint8_t stat = pio_read_8(ega_base + EGA_DATA_REG);
89
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
90
    pio_write_8(ega_base + EGA_DATA_REG, stat & (~(1 << 5)));
91
}
92
 
3844 decky 93
static void ega_move_cursor(void)
1 jermar 94
{
3975 decky 95
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
3902 jermar 96
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
3975 decky 97
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
3940 decky 98
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
3844 decky 99
}
100
 
3975 decky 101
static void ega_sync_cursor(void)
102
{
103
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
104
    uint8_t hi = pio_read_8(ega_base + EGA_DATA_REG);
105
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
106
    uint8_t lo = pio_read_8(ega_base + EGA_DATA_REG);
107
 
108
    ega_cursor = (hi << 8) | lo;
3994 decky 109
 
110
    if (ega_cursor >= EGA_SCREEN)
111
        ega_cursor = 0;
112
 
3975 decky 113
    if ((ega_cursor % EGA_COLS) != 0)
114
        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
115
 
3994 decky 116
    memsetw(videoram + ega_cursor * 2, EGA_SCREEN - ega_cursor, EMPTY_CHAR);
117
    memsetw(backbuf + ega_cursor * 2, EGA_SCREEN - ega_cursor, EMPTY_CHAR);
118
 
3975 decky 119
    ega_check_cursor();
120
    ega_move_cursor();
121
    ega_show_cursor();
122
}
123
 
3844 decky 124
static void ega_display_char(char ch, bool silent)
125
{
126
    backbuf[ega_cursor * 2] = ch;
4156 trochtova 127
    backbuf[ega_cursor * 2 + 1] = STYLE;
3844 decky 128
 
4156 trochtova 129
    if (!silent) {
3844 decky 130
        videoram[ega_cursor * 2] = ch;
4156 trochtova 131
        videoram[ega_cursor * 2 + 1] = STYLE;
132
    }
3844 decky 133
}
134
 
4156 trochtova 135
static void ega_putchar(outdev_t *dev __attribute__((unused)), const char ch, bool silent)
3844 decky 136
{
413 jermar 137
    ipl_t ipl;
3844 decky 138
 
413 jermar 139
    ipl = interrupts_disable();
1 jermar 140
    spinlock_lock(&egalock);
3844 decky 141
 
1 jermar 142
    switch (ch) {
2065 jermar 143
    case '\n':
3940 decky 144
        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
2065 jermar 145
        break;
146
    case '\t':
147
        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
148
        break;
149
    case '\b':
3940 decky 150
        if (ega_cursor % EGA_COLS)
2065 jermar 151
            ega_cursor--;
152
        break;
153
    default:
3844 decky 154
        ega_display_char(ch, silent);
2065 jermar 155
        ega_cursor++;
156
        break;
1473 decky 157
    }
1 jermar 158
    ega_check_cursor();
3844 decky 159
 
160
    if (!silent)
161
        ega_move_cursor();
162
 
1 jermar 163
    spinlock_unlock(&egalock);
413 jermar 164
    interrupts_restore(ipl);
1 jermar 165
}
166
 
4156 trochtova 167
static outdev_t ega_console;
168
static outdev_operations_t ega_ops = {
3844 decky 169
    .write = ega_putchar
170
};
171
 
3930 jermar 172
void ega_init(ioport8_t *base, uintptr_t videoram_phys)
1 jermar 173
{
3940 decky 174
    /* Initialize the software structure. */
3844 decky 175
    ega_base = base;
176
 
3940 decky 177
    backbuf = (uint8_t *) malloc(EGA_VRAM_SIZE, 0);
3844 decky 178
    if (!backbuf)
179
        panic("Unable to allocate backbuffer.");
180
 
3940 decky 181
    videoram = (uint8_t *) hw_map(videoram_phys, EGA_VRAM_SIZE);
3844 decky 182
 
3975 decky 183
    /* Synchronize the back buffer and cursor position. */
184
    memcpy(backbuf, videoram, EGA_VRAM_SIZE);
185
    ega_sync_cursor();
3844 decky 186
 
4156 trochtova 187
    outdev_initialize("ega", &ega_console, &ega_ops);
3844 decky 188
    stdout = &ega_console;
189
 
190
    sysinfo_set_item_val("fb", NULL, true);
191
    sysinfo_set_item_val("fb.kind", NULL, 2);
3940 decky 192
    sysinfo_set_item_val("fb.width", NULL, EGA_COLS);
193
    sysinfo_set_item_val("fb.height", NULL, EGA_ROWS);
3844 decky 194
    sysinfo_set_item_val("fb.blinking", NULL, true);
195
    sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
1 jermar 196
}
1702 cejka 197
 
3751 svoboda 198
void ega_redraw(void)
199
{
3940 decky 200
    memcpy(videoram, backbuf, EGA_VRAM_SIZE);
3751 svoboda 201
    ega_move_cursor();
3975 decky 202
    ega_show_cursor();
3751 svoboda 203
}
204
 
1754 jermar 205
/** @}
1702 cejka 206
 */