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 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 81 bvm_dbg_init(void) 82 { 83 } 84 85 static void 86 bvm_dbg_term(void) 87 { 88 } 89 90 static void 91 bvm_dbg_putc(int c) 92 { 93 94 outl(bvm_dbg_port, c); 95 } 96 97 static int 98 bvm_dbg_getc(void) 99 { 100 101 return (inl(bvm_dbg_port)); 102 } 103