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1 jermar 1
/*
2071 jermar 2
 * 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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/** @addtogroup genarch_drivers
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 * @{
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 */
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/**
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 * @file
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 * @brief EGA driver.
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 */
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#include <genarch/drivers/ega/ega.h>
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#include <putchar.h>
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#include <mm/page.h>
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#include <mm/as.h>
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#include <mm/slab.h>
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#include <arch/mm/page.h>
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#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>
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#include <sysinfo/sysinfo.h>
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#include <ddi/ddi.h>
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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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SPINLOCK_INITIALIZE(egalock);
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static uint32_t ega_cursor;
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static uint8_t *videoram;
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static uint8_t *backbuf;
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static ioport8_t *ega_base;
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575 palkovsky 63
chardev_t ega_console;
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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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3779 jermar 73
    memmove((void *) videoram, (void *) (videoram + ROW * 2),
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        (SCREEN - ROW) * 2);
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    memmove((void *) backbuf, (void *) (backbuf + ROW * 2),
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        (SCREEN - ROW) * 2);
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    memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
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    memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
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    ega_cursor = ega_cursor - ROW;
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}
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static void ega_move_cursor(void)
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{
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    pio_write_8(ega_base + EGA_INDEX_REG, 0xe);
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    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
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    pio_write_8(ega_base + EGA_INDEX_REG, 0xf);
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    pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));   
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}
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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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    if (!silent)
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        videoram[ega_cursor * 2] = ch;
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}
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static void ega_putchar(chardev_t *d __attribute__((unused)), const char ch, bool silent)
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{
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    ipl_t ipl;
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    ipl = interrupts_disable();
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    spinlock_lock(&egalock);
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    switch (ch) {
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    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, silent);
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        ega_cursor++;
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        break;
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    }
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    ega_check_cursor();
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    if (!silent)
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        ega_move_cursor();
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    spinlock_unlock(&egalock);
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    interrupts_restore(ipl);
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}
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3844 decky 130
static chardev_operations_t ega_ops = {
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    .write = ega_putchar
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};
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3930 jermar 134
void ega_init(ioport8_t *base, uintptr_t videoram_phys)
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{
3844 decky 136
    /* Initialize the software structure. */   
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    ega_base = base;
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    backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
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    if (!backbuf)
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        panic("Unable to allocate backbuffer.");
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    videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
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    /* Clear the screen and set the cursor position. */
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    memsetw(videoram, SCREEN, 0x0720);
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    memsetw(backbuf, SCREEN, 0x0720);
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    ega_move_cursor();
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    chardev_initialize("ega_out", &ega_console, &ega_ops);
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    stdout = &ega_console;
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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.blinking", NULL, true);
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    sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
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}
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3751 svoboda 161
void ega_redraw(void)
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{
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    memcpy(videoram, backbuf, SCREEN * 2);
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    ega_move_cursor();
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}
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1754 jermar 167
/** @}
1702 cejka 168
 */