]> CyberLeo.Net >> Repos - FreeBSD/releng/10.2.git/blob - sys/dev/bvm/bvm_dbg.c
- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
[FreeBSD/releng/10.2.git] / sys / dev / bvm / bvm_dbg.c
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
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
79 bvm_dbg_init(void)
80 {
81 }
82
83 static void
84 bvm_dbg_term(void)
85 {
86 }
87
88 static void
89 bvm_dbg_putc(int c)
90 {
91
92         outl(bvm_dbg_port, c);
93 }
94
95 static int
96 bvm_dbg_getc(void)
97 {
98
99         return (inl(bvm_dbg_port));
100 }