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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>
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#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);
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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
 
3994 decky 63
#define EMPTY_CHAR  0x0720
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575 palkovsky 65
chardev_t ega_console;
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1 jermar 67
/*
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 * This function takes care of scrolling.
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 */
452 decky 70
static void ega_check_cursor(void)
1 jermar 71
{
3940 decky 72
    if (ega_cursor < EGA_SCREEN)
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        return;
3994 decky 74
 
3940 decky 75
    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 79
    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 81
    ega_cursor = ega_cursor - EGA_COLS;
1 jermar 82
}
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3975 decky 84
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 92
static void ega_move_cursor(void)
1 jermar 93
{
3975 decky 94
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
3902 jermar 95
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
3975 decky 96
    pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
3940 decky 97
    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
3844 decky 98
}
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3975 decky 100
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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107
    ega_cursor = (hi << 8) | lo;
3994 decky 108
 
109
    if (ega_cursor >= EGA_SCREEN)
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        ega_cursor = 0;
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3975 decky 112
    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 115
    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 118
    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 123
static void ega_display_char(char ch, bool silent)
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{
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    backbuf[ega_cursor * 2] = ch;
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127
    if (!silent)
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        videoram[ega_cursor * 2] = ch;
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}
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3994 decky 131
static void ega_putchar(chardev_t *dev __attribute__((unused)), const char ch, bool silent)
3844 decky 132
{
413 jermar 133
    ipl_t ipl;
3844 decky 134
 
413 jermar 135
    ipl = interrupts_disable();
1 jermar 136
    spinlock_lock(&egalock);
3844 decky 137
 
1 jermar 138
    switch (ch) {
2065 jermar 139
    case '\n':
3940 decky 140
        ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
2065 jermar 141
        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 146
        if (ega_cursor % EGA_COLS)
2065 jermar 147
            ega_cursor--;
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        break;
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    default:
3844 decky 150
        ega_display_char(ch, silent);
2065 jermar 151
        ega_cursor++;
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        break;
1473 decky 153
    }
1 jermar 154
    ega_check_cursor();
3844 decky 155
 
156
    if (!silent)
157
        ega_move_cursor();
158
 
1 jermar 159
    spinlock_unlock(&egalock);
413 jermar 160
    interrupts_restore(ipl);
1 jermar 161
}
162
 
3844 decky 163
static chardev_operations_t ega_ops = {
164
    .write = ega_putchar
165
};
166
 
3930 jermar 167
void ega_init(ioport8_t *base, uintptr_t videoram_phys)
1 jermar 168
{
3940 decky 169
    /* Initialize the software structure. */
3844 decky 170
    ega_base = base;
171
 
3940 decky 172
    backbuf = (uint8_t *) malloc(EGA_VRAM_SIZE, 0);
3844 decky 173
    if (!backbuf)
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        panic("Unable to allocate backbuffer.");
175
 
3940 decky 176
    videoram = (uint8_t *) hw_map(videoram_phys, EGA_VRAM_SIZE);
3844 decky 177
 
3975 decky 178
    /* Synchronize the back buffer and cursor position. */
179
    memcpy(backbuf, videoram, EGA_VRAM_SIZE);
180
    ega_sync_cursor();
3844 decky 181
 
182
    chardev_initialize("ega_out", &ega_console, &ega_ops);
183
    stdout = &ega_console;
184
 
185
    sysinfo_set_item_val("fb", NULL, true);
186
    sysinfo_set_item_val("fb.kind", NULL, 2);
3940 decky 187
    sysinfo_set_item_val("fb.width", NULL, EGA_COLS);
188
    sysinfo_set_item_val("fb.height", NULL, EGA_ROWS);
3844 decky 189
    sysinfo_set_item_val("fb.blinking", NULL, true);
190
    sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
1 jermar 191
}
1702 cejka 192
 
3751 svoboda 193
void ega_redraw(void)
194
{
3940 decky 195
    memcpy(videoram, backbuf, EGA_VRAM_SIZE);
3751 svoboda 196
    ega_move_cursor();
3975 decky 197
    ega_show_cursor();
3751 svoboda 198
}
199
 
1754 jermar 200
/** @}
1702 cejka 201
 */