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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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#include <arch/ega.h>
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#include <putchar.h>
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#include <mm/page.h>
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#include <mm/asid.h>
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#include <arch/mm/page.h>
1 jermar 34
#include <synch/spinlock.h>
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#include <arch/types.h>
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#include <arch/asm.h>
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#include <memstr.h>
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#include <console/chardev.h>
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#include <console/console.h>
1 jermar 40
 
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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 46
SPINLOCK_INITIALIZE(egalock);
1 jermar 47
static __u32 ega_cursor;
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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 56
void ega_move_cursor(void);
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void ega_init(void)
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{
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    __u8 hi, lo;
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687 jermar 62
    page_mapping_insert(PA2KA(VIDEORAM), ASID_KERNEL, VIDEORAM, PAGE_NOT_CACHEABLE, 0);
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    outb(0x3d4,0xe);
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    hi = inb(0x3d5);
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    outb(0x3d4,0xf);
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    lo = inb(0x3d5);
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    ega_cursor = (hi<<8)|lo;
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    chardev_initialize("ega_out", &ega_console, &ega_ops);
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    stdout = &ega_console;
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    putchar('\n');
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}
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452 decky 75
static void ega_display_char(char ch)
1 jermar 76
{
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    __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
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    vram[ega_cursor*2] = ch;
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}
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/*
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 * This function takes care of scrolling.
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 */
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static void ega_check_cursor(void)
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{
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    if (ega_cursor < SCREEN)
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        return;
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    memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
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    memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
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    ega_cursor = ega_cursor - ROW;
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}
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575 palkovsky 95
void ega_putchar(chardev_t *d, const char ch)
1 jermar 96
{
413 jermar 97
    ipl_t ipl;
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413 jermar 99
    ipl = interrupts_disable();
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    spinlock_lock(&egalock);
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    switch (ch) {
588 palkovsky 103
    case '\n':
125 jermar 104
        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:
125 jermar 114
        ega_display_char(ch);
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        ega_cursor++;
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        break;
1 jermar 117
        }
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    ega_check_cursor();
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    ega_move_cursor();
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1 jermar 121
    spinlock_unlock(&egalock);
413 jermar 122
    interrupts_restore(ipl);
1 jermar 123
}
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void ega_move_cursor(void)
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{
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    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);   
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}