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
40static gdb_probe_f bvm_dbg_probe;
41static gdb_init_f bvm_dbg_init;
42static gdb_term_f bvm_dbg_term;
43static gdb_getc_f bvm_dbg_getc;
44static gdb_putc_f bvm_dbg_putc;
45
46GDB_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
50static int bvm_dbg_port = BVM_DBG_PORT;
51
52#define BVM_DBG_SIG	('B' << 8 | 'V')
53
54static int
55bvm_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
78static void
79bvm_dbg_init(void)
80{
81}
82
83static void
84bvm_dbg_term(void)
85{
86}
87
88static void
89bvm_dbg_putc(int c)
90{
91
92	outl(bvm_dbg_port, c);
93}
94
95static int
96bvm_dbg_getc(void)
97{
98
99	return (inl(bvm_dbg_port));
100}
101