The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/bvm/bvm_dbg.c

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    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: releng/10.3/sys/dev/bvm/bvm_dbg.c 245678 2013-01-20 03:42:49Z neel $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/10.3/sys/dev/bvm/bvm_dbg.c 245678 2013-01-20 03:42:49Z neel $");
   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 }

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