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db_cpu.c revision 1.3.6.2 
      1 /*	$NetBSD: db_cpu.c,v 1.3.6.2 2009/05/13 17:19:04 jym Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2009 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: db_cpu.c,v 1.3.6.2 2009/05/13 17:19:04 jym Exp $");
     34 
     35 #ifndef _KERNEL
     36 #include <stdbool.h>
     37 #endif
     38 
     39 #include <sys/param.h>
     40 #include <sys/cpu.h>
     41 #include <sys/proc.h>
     42 
     43 #include <ddb/ddb.h>
     44 
     45 static struct cpu_info	*head;
     46 
     47 struct cpu_info *
     48 db_cpu_first(void)
     49 {
     50 
     51 	head = db_read_ptr("cpu_queue");
     52 	return head;
     53 }
     54 
     55 struct cpu_info *
     56 db_cpu_next(struct cpu_info *ci)
     57 {
     58 
     59 	db_read_bytes((db_addr_t)&ci->ci_data.cpu_qchain.cqe_next,
     60 	    sizeof(ci), (char *)&ci);
     61 	if (ci == head) {
     62 		ci = NULL;
     63 	}
     64 	return ci;
     65 }
     66