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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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3940 decky 29
/** @addtogroup genarch_drivers
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 * @{
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 */
1754 jermar 32
/**
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 * @file
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 * @brief EGA driver.
1702 cejka 35
 */
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3779 jermar 37
#include <genarch/drivers/ega/ega.h>
1 jermar 38
#include <putchar.h>
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#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>
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#include <arch/types.h>
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#include <arch/asm.h>
195 vana 46
#include <memstr.h>
575 palkovsky 47
#include <console/chardev.h>
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#include <console/console.h>
1473 decky 49
#include <sysinfo/sysinfo.h>
2015 jermar 50
#include <ddi/ddi.h>
1 jermar 51
 
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/*
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 * The EGA driver.
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 * Simple and short. Function for displaying characters and "scrolling".
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 */
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623 jermar 57
SPINLOCK_INITIALIZE(egalock);
1780 jermar 58
static uint32_t ega_cursor;
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static uint8_t *videoram;
3751 svoboda 60
static uint8_t *backbuf;
3930 jermar 61
static ioport8_t *ega_base;
1 jermar 62
 
4093 decky 63
#define SPACE  0x20
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#define STYLE  0x07
3994 decky 65
 
4093 decky 66
#define EMPTY_CHAR  (STYLE << 8 | SPACE)
575 palkovsky 67
 
1 jermar 68
/*
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 * This function takes care of scrolling.
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 */
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),
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        (EGA_SCREEN - EGA_COLS) * 2);
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    memmove((void *) backbuf, (void *) (backbuf + EGA_COLS * 2),
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        (EGA_SCREEN - EGA_COLS) * 2);
3994 decky 80
    memsetw(videoram + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, EMPTY_CHAR);
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    memsetw(backbuf + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, EMPTY_CHAR);
3940 decky 82
    ega_cursor = ega_cursor - EGA_COLS;
1 jermar 83
}
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3975 decky 85
static void ega_show_cursor(void)
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{
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    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
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    uint8_t stat = pio_read_8(ega_base + EGA_DATA_REG);
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    pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
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    pio_write_8(ega_base + EGA_DATA_REG, stat & (~(1 << 5)));
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}
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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
}
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3975 decky 101
static void ega_sync_cursor(void)
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{
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    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
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    uint8_t hi = pio_read_8(ega_base + EGA_DATA_REG);
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    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
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    uint8_t lo = pio_read_8(ega_base + EGA_DATA_REG);
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    ega_cursor = (hi << 8) | lo;
3994 decky 109
 
110
    if (ega_cursor >= EGA_SCREEN)
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        ega_cursor = 0;
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3975 decky 113
    if ((ega_cursor % EGA_COLS) != 0)
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        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
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3994 decky 116
    memsetw(videoram + ega_cursor * 2, EGA_SCREEN - ega_cursor, EMPTY_CHAR);
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    memsetw(backbuf + ega_cursor * 2, EGA_SCREEN - ega_cursor, EMPTY_CHAR);
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3975 decky 119
    ega_check_cursor();
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    ega_move_cursor();
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    ega_show_cursor();
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}
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3844 decky 124
static void ega_display_char(char ch, bool silent)
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{
126
    backbuf[ega_cursor * 2] = ch;
4093 decky 127
    backbuf[ega_cursor * 2 + 1] = STYLE;
3844 decky 128
 
4093 decky 129
    if (!silent) {
3844 decky 130
        videoram[ega_cursor * 2] = ch;
4093 decky 131
        videoram[ega_cursor * 2 + 1] = STYLE;
132
    }
3844 decky 133
}
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4093 decky 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;
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    case '\t':
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        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
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        break;
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    case '\b':
3940 decky 150
        if (ega_cursor % EGA_COLS)
2065 jermar 151
            ega_cursor--;
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        break;
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    default:
3844 decky 154
        ega_display_char(ch, silent);
2065 jermar 155
        ega_cursor++;
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        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
 
4093 decky 167
static outdev_t ega_console;
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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
 
4093 decky 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);
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    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
 */