consport.c revision 221942 
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
45static struct termios tio_orig, tio_new;
46
47static void
48ttyclose(void)
49{
50	tcsetattr(STDIN_FILENO, TCSANOW, &tio_orig);
51}
52
53static void
54ttyopen(void)
55{
56	tcgetattr(STDIN_FILENO, &tio_orig);
57
58	cfmakeraw(&tio_new);
59	tcsetattr(STDIN_FILENO, TCSANOW, &tio_new);
60
61	atexit(ttyclose);
62}
63
64static bool
65tty_char_available(void)
66{
67        fd_set rfds;
68        struct timeval tv;
69
70        FD_ZERO(&rfds);
71        FD_SET(STDIN_FILENO, &rfds);
72        tv.tv_sec = 0;
73        tv.tv_usec = 0;
74        if (select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv) > 0) {
75		return (true);
76	} else {
77		return (false);
78	}
79}
80
81static int
82ttyread(void)
83{
84	char rb;
85
86	if (tty_char_available()) {
87		read(STDIN_FILENO, &rb, 1);
88		return (rb & 0xff);
89	} else {
90		return (-1);
91	}
92}
93
94static void
95ttywrite(unsigned char wb)
96{
97	(void) write(STDOUT_FILENO, &wb, 1);
98}
99
100static int
101console_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
102		uint32_t *eax, void *arg)
103{
104	static int opened;
105
106	if (bytes != 4)
107		return (-1);
108
109	if (!opened) {
110		ttyopen();
111		opened = 1;
112	}
113
114	if (in)
115		*eax = ttyread();
116	else
117		ttywrite(*eax);
118
119	return (0);
120}
121INOUT_PORT(console, BVM_CONSOLE_PORT, IOPORT_F_INOUT, console_handler);
122