125 lines
2.4 KiB
C
125 lines
2.4 KiB
C
/* $FreeBSD$
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/* $NetBSD: prom.c,v 1.3 1997/09/06 14:03:58 drochner Exp $ */
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/*
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* Mach Operating System
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#include <sys/types.h>
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#include "bootstrap.h"
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#include "openfirm.h"
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int console;
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static void ofw_cons_probe(struct console *cp);
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static int ofw_cons_init(int);
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void ofw_cons_putchar(int);
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int ofw_cons_getchar(void);
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int ofw_cons_poll(void);
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static ihandle_t stdin;
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static ihandle_t stdout;
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struct console ofwconsole = {
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"ofw",
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"OpenFirmware console",
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0,
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ofw_cons_probe,
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ofw_cons_init,
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ofw_cons_putchar,
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ofw_cons_getchar,
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ofw_cons_poll,
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};
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static void
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ofw_cons_probe(struct console *cp)
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{
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phandle_t chosen;
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if ((chosen = OF_finddevice("/chosen")) == -1)
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OF_exit();
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OF_getprop(chosen, "stdin", &stdin, sizeof(stdin));
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OF_getprop(chosen, "stdout", &stdout, sizeof(stdout));
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cp->c_flags |= C_PRESENTIN|C_PRESENTOUT;
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}
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static int
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ofw_cons_init(int arg)
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{
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return 0;
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}
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void
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ofw_cons_putchar(int c)
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{
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char cbuf;
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if (c == '\n') {
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cbuf = '\r';
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OF_write(stdout, &cbuf, 1);
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}
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cbuf = c;
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OF_write(stdout, &cbuf, 1);
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}
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static int saved_char = -1;
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int
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ofw_cons_getchar()
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{
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unsigned char ch = '\0';
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int l;
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if (saved_char != -1) {
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l = saved_char;
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saved_char = -1;
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return l;
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}
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while ((l = OF_read(stdin, &ch, 1)) != 1)
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if (l != -2 && l != 0)
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return -1;
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return ch;
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}
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int
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ofw_cons_poll()
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{
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unsigned char ch;
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int l;
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if (saved_char != -1)
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return 1;
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if (OF_read(stdin, &ch, 1) > 0) {
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saved_char = ch;
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return 1;
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}
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return 0;
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}
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