ofw/libofw/ofw_console.c

	ofw_console.c revision 199767f8919635c4928607450d9e0abb932109ce
/* $NetBSD: prom.c,v 1.3 1997/09/06 14:03:58 drochner Exp $ */

/*-
 * Mach Operating System
 * Copyright (c) 1992 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>

#include "bootstrap.h"
#include "openfirm.h"

static void ofw_cons_probe(struct console *cp);
static int ofw_cons_init(int);
void ofw_cons_putchar(int);
int ofw_cons_getchar(void);
int ofw_cons_poll(void);

static ihandle_t stdin;
static ihandle_t stdout;

struct console ofwconsole = {
    "ofw",
    "Open Firmware console",
    0,
    ofw_cons_probe,
    ofw_cons_init,
    ofw_cons_putchar,
    ofw_cons_getchar,
    ofw_cons_poll,
};

static void
ofw_cons_probe(struct console *cp)
{

    OF_getprop(chosen, "stdin", &stdin, sizeof(stdin));
    OF_getprop(chosen, "stdout", &stdout, sizeof(stdout));
    cp->c_flags |= C_PRESENTIN|C_PRESENTOUT;
}

static int
ofw_cons_init(int arg)
{
    return 0;
}

void
ofw_cons_putchar(int c)
{
    char cbuf;

    if (c == '\n') {
        cbuf = '\r';
        OF_write(stdout, &cbuf, 1);
    }

    cbuf = c;
    OF_write(stdout, &cbuf, 1);
}

static int saved_char = -1;

int
ofw_cons_getchar()
{
    unsigned char ch = '\0';
    int l;

    if (saved_char != -1) {
        l = saved_char;
        saved_char = -1;
        return l;
    }

    if (OF_read(stdin, &ch, 1) > 0)
        return (ch);

    return (-1);
}

int
ofw_cons_poll()
{
    unsigned char ch;

    if (saved_char != -1)
        return 1;

    if (OF_read(stdin, &ch, 1) > 0) {
        saved_char = ch;
        return 1;
    }

    return 0;
}