1/*-
2 * Copyright (c) 2011 NetApp, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33#include <sys/select.h>
34
35#include <stdio.h>
36#include <stdlib.h>
37#include <termios.h>
38#include <unistd.h>
39#include <stdbool.h>
40
41#include "inout.h"
42
43#define	BVM_CONSOLE_PORT	0x220
44#define	BVM_CONS_SIG		('b' << 8 | 'v')
45
46static struct termios tio_orig, tio_new;
47
48static void
49ttyclose(void)
50{
51	tcsetattr(STDIN_FILENO, TCSANOW, &tio_orig);
52}
53
54static void
55ttyopen(void)
56{
57	tcgetattr(STDIN_FILENO, &tio_orig);
58
59	cfmakeraw(&tio_new);
60	tcsetattr(STDIN_FILENO, TCSANOW, &tio_new);
61
62	atexit(ttyclose);
63}
64
65static bool
66tty_char_available(void)
67{
68        fd_set rfds;
69        struct timeval tv;
70
71        FD_ZERO(&rfds);
72        FD_SET(STDIN_FILENO, &rfds);
73        tv.tv_sec = 0;
74        tv.tv_usec = 0;
75        if (select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv) > 0) {
76		return (true);
77	} else {
78		return (false);
79	}
80}
81
82static int
83ttyread(void)
84{
85	char rb;
86
87	if (tty_char_available()) {
88		read(STDIN_FILENO, &rb, 1);
89		return (rb & 0xff);
90	} else {
91		return (-1);
92	}
93}
94
95static void
96ttywrite(unsigned char wb)
97{
98	(void) write(STDOUT_FILENO, &wb, 1);
99}
100
101static int
102console_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
103		uint32_t *eax, void *arg)
104{
105	static int opened;
106
107	if (bytes == 2 && in) {
108		*eax = BVM_CONS_SIG;
109		return (0);
110	}
111
112	if (bytes != 4)
113		return (-1);
114
115	if (!opened) {
116		ttyopen();
117		opened = 1;
118	}
119
120	if (in)
121		*eax = ttyread();
122	else
123		ttywrite(*eax);
124
125	return (0);
126}
127
128static struct inout_port consport = {
129	"bvmcons",
130	BVM_CONSOLE_PORT,
131	1,
132	IOPORT_F_INOUT,
133	console_handler
134};
135
136void
137init_bvmcons(void)
138{
139
140	register_inout(&consport);
141}
142