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/* $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/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 = {
.c_name = "ofw",
.c_desc = "Open Firmware console",
.c_probe = ofw_cons_probe,
.c_init = ofw_cons_init,
.c_out = ofw_cons_putchar,
.c_in = ofw_cons_getchar,
.c_ready = 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(void)
{
unsigned char ch = '\0';
int l;
if (saved_char != -1) {
l = saved_char;
saved_char = -1;
return (l);
}
/* At least since version 4.0.0, QEMU became bug-compatible
* with PowerVM's vty, by inserting a \0 after every \r.
* As this confuses loader's interpreter and as a \0 coming
* from the console doesn't seem reasonable, it's filtered here. */
if (OF_read(stdin, &ch, 1) > 0 && ch != '\0')
return (ch);
return (-1);
}
int
ofw_cons_poll(void)
{
unsigned char ch;
if (saved_char != -1)
return (1);
if (OF_read(stdin, &ch, 1) > 0) {
saved_char = ch;
return (1);
}
return (0);
}
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