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1 jermar 1 
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * 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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1754 jermar 29 
/** @addtogroup ia32   
1702 cejka 30 
 * @{
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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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1473 decky 37 
#include <arch/drivers/ega.h>
1 jermar 38 
#include <putchar.h>
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#include <mm/page.h>
755 jermar 40 
#include <mm/as.h>
167 jermar 41 
#include <arch/mm/page.h>
1 jermar 42 
#include <synch/spinlock.h>
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#include <arch/types.h>
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#include <arch/asm.h>
195 vana 45 
#include <memstr.h>
575 palkovsky 46 
#include <console/chardev.h>
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#include <console/console.h>
1473 decky 48 
#include <sysinfo/sysinfo.h>
1 jermar 49 
 
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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 55 
SPINLOCK_INITIALIZE(egalock);
1780 jermar 56 
static uint32_t ega_cursor;
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static uint8_t *videoram;
1 jermar 58 
 
575 palkovsky 59 
static void ega_putchar(chardev_t *d, const char ch);
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chardev_t ega_console;
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static chardev_operations_t ega_ops = {
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    .write = ega_putchar
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};
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1 jermar 66 
void ega_move_cursor(void);
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void ega_init(void)
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{
1780 jermar 70 
    uint8_t hi, lo;
1473 decky 71 
 
1780 jermar 72 
    videoram = (uint8_t *) hw_map(VIDEORAM, SCREEN * 2);
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    outb(0x3d4, 0xe);
1 jermar 74 
    hi = inb(0x3d5);
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    outb(0x3d4, 0xf);
1 jermar 76 
    lo = inb(0x3d5);
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    ega_cursor = (hi << 8) | lo;
575 palkovsky 78 
 
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    chardev_initialize("ega_out", &ega_console, &ega_ops);
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    stdout = &ega_console;
1473 decky 81 
 
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    sysinfo_set_item_val("fb", NULL, true);
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    sysinfo_set_item_val("fb.kind", NULL, 2);
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    sysinfo_set_item_val("fb.width", NULL, ROW);
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    sysinfo_set_item_val("fb.height", NULL, ROWS);
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    sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
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1296 vana 88 
#ifndef CONFIG_FB
575 palkovsky 89 
    putchar('\n');
1296 vana 90 
#endif 
1 jermar 91 
}
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452 decky 93 
static void ega_display_char(char ch)
1 jermar 94 
{
1473 decky 95 
    videoram[ega_cursor * 2] = ch;
1 jermar 96 
}
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/*
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 * This function takes care of scrolling.
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 */
452 decky 101 
static void ega_check_cursor(void)
1 jermar 102 
{
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    if (ega_cursor < SCREEN)
125 jermar 104 
        return;
1 jermar 105 
 
1473 decky 106 
    memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
1780 jermar 107 
    memsetw((uintptr_t) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720);
1 jermar 108 
    ega_cursor = ega_cursor - ROW;
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}
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575 palkovsky 111 
void ega_putchar(chardev_t *d, const char ch)
1 jermar 112 
{
413 jermar 113 
    ipl_t ipl;
1 jermar 114 
 
413 jermar 115 
    ipl = interrupts_disable();
1 jermar 116 
    spinlock_lock(&egalock);
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    switch (ch) {
1473 decky 119 
        case '\n':
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            ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
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            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':
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            if (ega_cursor % ROW)
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                ega_cursor--;
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            break;
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        default:
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            ega_display_char(ch);
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            ega_cursor++;
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            break;
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    }
1 jermar 134 
    ega_check_cursor();
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    ega_move_cursor();
125 jermar 136 
 
1 jermar 137 
    spinlock_unlock(&egalock);
413 jermar 138 
    interrupts_restore(ipl);
1 jermar 139 
}
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141 
void ega_move_cursor(void)
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{
1473 decky 143 
    outb(0x3d4, 0xe);
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    outb(0x3d5, (ega_cursor >> 8) & 0xff);
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    outb(0x3d4, 0xf);
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    outb(0x3d5, ega_cursor & 0xff);
1 jermar 147 
}
1702 cejka 148 
 
1754 jermar 149 
/** @}
1702 cejka 150 
 */