1 /* 2 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29 #include <sys/cdefs.h> 30 31 typedef enum { 32 KDP_EVENT_ENTER, 33 KDP_EVENT_EXIT, 34 KDP_EVENT_PANICLOG 35 } kdp_event_t; 36 37 __BEGIN_DECLS 38 typedef void (*kdp_callout_fn_t)(void *arg, kdp_event_t event); 39 40 /* 41 * Register fn(arg, event) to be called at kdp entry/exit. 42 * The callouts are made in a single-threaded environment, interrupts are 43 * disabled and processors other than the callout processor quiesced. 44 * N.B. callouts are strictly limited in what they can do: they must execute 45 * with interrupts disabled and they can't call back into the kernel for any 46 * non-trivial service. 47 */ 48 extern void kdp_register_callout(kdp_callout_fn_t fn, void *arg); 49 50 __END_DECLS 51