Subversion Repositories s80186

// Copyright Jamie Iles, 2017

//

// This file is part of s80x86.

//

// s80x86 is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// s80x86 is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with s80x86.  If not, see <http://www.gnu.org/licenses/>.

#include "bios.h"

#include "bda.h"

#include "io.h"

extern void video_putchar(char c);

#define UART_DATA_PORT 0xfffa

#define UART_STATUS_PORT 0xfffb

#define UART_TX_BUSY 0x02

#define UART_RX_READY 0x01

void putchar(unsigned char c)

{

#ifdef SERIAL_STDIO

    outb(UART_DATA_PORT, c);

    while (inb(UART_STATUS_PORT) & UART_TX_BUSY)

        continue;

#endif // SERIAL_STDIO

    video_putchar(c);

    if (c == '\n')

        putchar('\r');

}

void serial_putchar(unsigned char c)

{

    outb(UART_DATA_PORT, c);

    while (inb(UART_STATUS_PORT) & UART_TX_BUSY)

        continue;

    if (c == '\n')

        serial_putchar('\r');

}

extern void kbd_buffer_add(unsigned short key);

int serial_poll(void)

{

    int ready = inb(UART_STATUS_PORT) & UART_RX_READY;

    if (ready)

        kbd_buffer_add(inb(UART_DATA_PORT));

    return ready;

}

void putbyte(unsigned char b)

{

    static const char hexarr[] = "0123456789abcdef";

    putchar(hexarr[(b & 0xf0) >> 4]);

    putchar(hexarr[b & 0x0f]);

}

void putstr(const char *str)

{

    char p;

    for (p = *str; p != 0; ++str, p = *str)

        putchar(p);

}