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);
}