bvm_dbg.c revision 242194
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