1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*
27 * PROM I/O backend
28 */
29
30#include <sys/param.h>
31#include <sys/types.h>
32#include <sys/obpdefs.h>
33#include <string.h>
34#include <errno.h>
35#include <ctype.h>
36
37#include <mdb/mdb_modapi.h>
38#include <mdb/mdb_io_impl.h>
39#include <kmdb/kmdb_promif.h>
40#include <kmdb/kmdb_io.h>
41#include <mdb/mdb_debug.h>
42#include <mdb/mdb_err.h>
43#include <mdb/mdb.h>
44
45#define	PIO_FL_TIO_READ	0x001
46
47typedef struct pio_data {
48	char		pio_name[MAXPATHLEN];
49	ihandle_t	pio_fd;
50	uint_t		pio_flags;
51	struct termios	pio_ti;
52} pio_data_t;
53
54static pid_t pio_pgrp;
55
56static ssize_t
57pio_read(mdb_io_t *io, void *buf, size_t nbytes)
58{
59	pio_data_t *pdp = io->io_data;
60
61	if (io->io_next == NULL)
62		return (kmdb_prom_read(buf, nbytes, &pdp->pio_ti));
63
64	return (IOP_READ(io->io_next, buf, nbytes));
65}
66
67static ssize_t
68pio_write(mdb_io_t *io, const void *buf, size_t nbytes)
69{
70	pio_data_t *pdp = io->io_data;
71
72	if (io->io_next == NULL)
73		return (kmdb_prom_write(buf, nbytes, &pdp->pio_ti));
74
75	return (IOP_WRITE(io->io_next, buf, nbytes));
76}
77
78static off64_t
79pio_seek(mdb_io_t *io, off64_t offset, int whence)
80{
81	if (io->io_next == NULL)
82		return (set_errno(ENOTSUP));
83
84	return (IOP_SEEK(io->io_next, offset, whence));
85}
86
87static int
88pio_ctl(mdb_io_t *io, int req, void *arg)
89{
90	pio_data_t *pdp = io->io_data;
91
92	if (io->io_next != NULL)
93		return (IOP_CTL(io->io_next, req, arg));
94
95	switch (req) {
96	case TIOCGWINSZ:
97		return (kmdb_prom_term_ctl(TIOCGWINSZ, arg));
98
99	case TCGETS: {
100		struct termios *ti = arg;
101
102		if (!(pdp->pio_flags & PIO_FL_TIO_READ)) {
103			(void) kmdb_prom_term_ctl(TCGETS, &pdp->pio_ti);
104			pdp->pio_flags |= PIO_FL_TIO_READ;
105		}
106
107		bcopy(&pdp->pio_ti, ti, sizeof (struct termios));
108
109		mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: gets: i: 0%o o: 0%o c: "
110		    "0%o l: 0%o\n", ti->c_iflag, ti->c_oflag, ti->c_cflag,
111		    ti->c_lflag);
112		return (0);
113	}
114
115	case TCSETSW: {
116		struct termios *ti = arg;
117
118		mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: setsw: i: 0%o o: 0%o c: "
119		    "0%o l: 0%o\n", ti->c_iflag, ti->c_oflag, ti->c_cflag,
120		    ti->c_lflag);
121
122		bcopy(ti, &pdp->pio_ti, sizeof (struct termios));
123
124		return (0);
125	}
126
127	case TIOCSPGRP:
128		pio_pgrp = *(pid_t *)arg;
129		mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: spgrp: %ld\n",
130		    (long)pio_pgrp);
131		return (0);
132
133	case TIOCGPGRP:
134		mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: gpgrp: %ld\n",
135		    (long)pio_pgrp);
136		*(pid_t *)arg = pio_pgrp;
137		return (0);
138
139	case MDB_IOC_CTTY:
140		mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: ignoring MDB_IOC_CTTY\n");
141		return (0);
142
143	case MDB_IOC_GETFD:
144		return (set_errno(ENOTSUP));
145
146	default:
147		warn("Unknown ioctl %d\n", req);
148		return (set_errno(EINVAL));
149	}
150}
151
152void
153pio_close(mdb_io_t *io)
154{
155	pio_data_t *pdp = io->io_data;
156
157	mdb_free(pdp, sizeof (pio_data_t));
158}
159
160static const char *
161pio_name(mdb_io_t *io)
162{
163	pio_data_t *pdp = io->io_data;
164
165	if (io->io_next == NULL)
166		return (pdp->pio_name);
167
168	return (IOP_NAME(io->io_next));
169}
170
171static const mdb_io_ops_t promio_ops = {
172	pio_read,
173	pio_write,
174	pio_seek,
175	pio_ctl,
176	pio_close,
177	pio_name,
178	no_io_link,
179	no_io_unlink,
180	no_io_setattr,
181	no_io_suspend,
182	no_io_resume
183};
184
185mdb_io_t *
186kmdb_promio_create(char *name)
187{
188	mdb_io_t *io;
189	pio_data_t *pdp;
190	ihandle_t hdl = kmdb_prom_get_handle(name);
191
192	if (hdl == -1)
193		return (NULL);
194
195	io = mdb_zalloc(sizeof (mdb_io_t), UM_SLEEP);
196	pdp = mdb_zalloc(sizeof (pio_data_t), UM_SLEEP);
197
198	(void) strlcpy(pdp->pio_name, name, MAXPATHLEN);
199	pdp->pio_fd = hdl;
200
201#ifdef __sparc
202	pdp->pio_ti.c_oflag |= ONLCR;
203	pdp->pio_ti.c_iflag |= ICRNL;
204#endif
205	pdp->pio_ti.c_lflag |= ECHO;
206
207	io->io_data = pdp;
208	io->io_ops = &promio_ops;
209
210	return (io);
211}
212
213char
214kmdb_getchar(void)
215{
216	char c;
217
218	while (IOP_READ(mdb.m_term, &c, 1) != 1)
219		continue;
220	if (isprint(c) && c != '\n')
221		mdb_iob_printf(mdb.m_out, "%c", c);
222	mdb_iob_printf(mdb.m_out, "\n");
223
224	return (c);
225}
226