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db_cpu.c revision 1.1 
      1 /*	$NetBSD: db_cpu.c,v 1.1 2009/03/07 22:02:17 ad 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 1.1 2009/03/07 22:02:17 ad Exp $");
     34 
     35 #include <ddb/ddb.h>
     36 
     37 #include <sys/param.h>
     38 #include <sys/cpu.h>
     39 #include <sys/proc.h>
     40 
     41 static struct cpu_info	*head;
     42 
     43 struct cpu_info *
     44 db_cpu_first(void)
     45 {
     46 
     47 	head = db_read_ptr("cpu_queue");
     48 	return head;
     49 }
     50 
     51 struct cpu_info *
     52 db_cpu_next(struct cpu_info *ci)
     53 {
     54 
     55 	db_read_bytes((db_addr_t)&ci->ci_data.cpu_qchain.cqe_next,
     56 	    sizeof(ci), (char *)&ci);
     57 	if (ci == head) {
     58 		ci = NULL;
     59 	}
     60 	return ci;
     61 }
     62