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/param.h>
33 #include <sys/kernel.h>
34 #include <sys/bus.h>
35
36 #include <gdb/gdb.h>
37
38 #include <machine/cpufunc.h>
39
40 static gdb_probe_f bvm_dbg_probe;
41 static gdb_init_f bvm_dbg_init;
42 static gdb_term_f bvm_dbg_term;
43 static gdb_getc_f bvm_dbg_getc;
44 static gdb_putc_f bvm_dbg_putc;
45
46 GDB_DBGPORT(bvm, bvm_dbg_probe, bvm_dbg_init, bvm_dbg_term,
47 bvm_dbg_getc, bvm_dbg_putc);
48
49 #define BVM_DBG_PORT 0x224
50 static int bvm_dbg_port = BVM_DBG_PORT;
51
52 #define BVM_DBG_SIG ('B' << 8 | 'V')
53
54 static int
bvm_dbg_probe(void)55 bvm_dbg_probe(void)
56 {
57 int disabled, port;
58
59 disabled = 0;
60 resource_int_value("bvmdbg", 0, "disabled", &disabled);
61
62 if (!disabled) {
63 if (resource_int_value("bvmdbg", 0, "port", &port) == 0)
64 bvm_dbg_port = port;
65
66 if (inw(bvm_dbg_port) == BVM_DBG_SIG) {
67 /*
68 * Return a higher priority than 0 to override other
69 * gdb dbgport providers that may be present (e.g. uart)
70 */
71 return (1);
72 }
73 }
74
75 return (-1);
76 }
77
78 static void
bvm_dbg_init(void)79 bvm_dbg_init(void)
80 {
81 }
82
83 static void
bvm_dbg_term(void)84 bvm_dbg_term(void)
85 {
86 }
87
88 static void
bvm_dbg_putc(int c)89 bvm_dbg_putc(int c)
90 {
91
92 outl(bvm_dbg_port, c);
93 }
94
95 static int
bvm_dbg_getc(void)96 bvm_dbg_getc(void)
97 {
98
99 return (inl(bvm_dbg_port));
100 }
101