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