1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 NetApp, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/bus.h>
37
38 #include <gdb/gdb.h>
39
40 #include <machine/cpufunc.h>
41
42 static gdb_probe_f bvm_dbg_probe;
43 static gdb_init_f bvm_dbg_init;
44 static gdb_term_f bvm_dbg_term;
45 static gdb_getc_f bvm_dbg_getc;
46 static gdb_putc_f bvm_dbg_putc;
47
48 GDB_DBGPORT(bvm, bvm_dbg_probe, bvm_dbg_init, bvm_dbg_term,
49 bvm_dbg_getc, bvm_dbg_putc);
50
51 #define BVM_DBG_PORT 0x224
52 static int bvm_dbg_port = BVM_DBG_PORT;
53
54 #define BVM_DBG_SIG ('B' << 8 | 'V')
55
56 static int
bvm_dbg_probe(void)57 bvm_dbg_probe(void)
58 {
59 int disabled, port;
60
61 disabled = 0;
62 resource_int_value("bvmdbg", 0, "disabled", &disabled);
63
64 if (!disabled) {
65 if (resource_int_value("bvmdbg", 0, "port", &port) == 0)
66 bvm_dbg_port = port;
67
68 if (inw(bvm_dbg_port) == BVM_DBG_SIG) {
69 /*
70 * Return a higher priority than 0 to override other
71 * gdb dbgport providers that may be present (e.g. uart)
72 */
73 return (1);
74 }
75 }
76
77 return (-1);
78 }
79
80 static void
bvm_dbg_init(void)81 bvm_dbg_init(void)
82 {
83 }
84
85 static void
bvm_dbg_term(void)86 bvm_dbg_term(void)
87 {
88 }
89
90 static void
bvm_dbg_putc(int c)91 bvm_dbg_putc(int c)
92 {
93
94 outl(bvm_dbg_port, c);
95 }
96
97 static int
bvm_dbg_getc(void)98 bvm_dbg_getc(void)
99 {
100
101 return (inl(bvm_dbg_port));
102 }
103