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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #include <sys/param.h>
     27 
     28 /*
     29  * In-Kernel Logical Domain Channel (LDC) Functionality
     30  *
     31  * Provides a mechanism for LDC channels to be reset when entering
     32  * the prom or kmdb by invoking a callback before entry.
     33  */
     34 
     35 /*
     36  * Setting this to zero disables debug_enter/debug_exit callbacks
     37  * which may be useful when debugging LDC related issues.
     38  */
     39 static int kldc_callback_enabled = 1;
     40 
     41 /*
     42  * Callback function pointer.
     43  */
     44 static void (*kldc_debug_enter_cb)(void);
     45 
     46 void
     47 kldc_set_debug_cb(void (*debug_enter_cb)(void))
     48 {
     49 	kldc_debug_enter_cb = debug_enter_cb;
     50 }
     51 
     52 /*
     53  * Called just before entering the prom or kmdb but after all other CPUs
     54  * have entered the idle loop.
     55  */
     56 void
     57 kldc_debug_enter(void)
     58 {
     59 	if (kldc_callback_enabled != 0 && kldc_debug_enter_cb != NULL) {
     60 		(*kldc_debug_enter_cb)();
     61 	}
     62 }
     63