[apple/xnu.git] / osfmk / kern / xpr.c

/*
 * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 * xpr silent tracing circular buffer.
 */

#include <mach/machine/vm_types.h>
#include <kern/xpr.h>
#include <kern/lock.h>
#include <kern/spl.h>
#include <kern/cpu_number.h>
#include <kern/misc_protos.h>
#include <kern/thread.h>
#include <vm/vm_kern.h>
#include <string.h>

/*
 *	After a spontaneous reboot, it is desirable to look
 *	at the old xpr buffer.  Assuming xprbootstrap allocates
 *	the buffer in the same place in physical memory and
 *	the reboot doesn't clear memory, this should work.
 *	xprptr will be reset, but the saved value should be OK.
 *	Just set xprenable false so the buffer isn't overwritten.
 */

decl_simple_lock_data(,xprlock)
boolean_t xprenable = TRUE;	/* Enable xpr tracing */
int nxprbufs = 0;	/* Number of contiguous xprbufs allocated */
int xprflags = 0;	/* Bit mask of xpr flags enabled */
struct xprbuf *xprbase;	/* Pointer to circular buffer nxprbufs*sizeof(xprbuf)*/
struct xprbuf *xprptr;	/* Currently allocated xprbuf */
struct xprbuf *xprlast;	/* Pointer to end of circular buffer */

void
xpr(
	const char	*msg,
	long		arg1,
	long		arg2,
	long		arg3,
	long		arg4,
	long		arg5)
{
	spl_t s;
	register struct xprbuf *x;

	/* If we aren't initialized, ignore trace request */
	if (!xprenable || (xprptr == 0))
		return;
	/* Guard against all interrupts and allocate next buffer. */

	s = splhigh();
	simple_lock(&xprlock);
	x = xprptr++;
	if (xprptr >= xprlast) {
		/* wrap around */
		xprptr = xprbase;
	}
	/* Save xprptr in allocated memory. */
	*(struct xprbuf **)xprlast = xprptr;
	simple_unlock(&xprlock);
	x->timestamp = XPR_TIMESTAMP;
	splx(s);
	x->msg = msg;
	x->arg1 = arg1;
	x->arg2 = arg2;
	x->arg3 = arg3;
	x->arg4 = arg4;
	x->arg5 = arg5;
	mp_disable_preemption();
	x->cpuinfo = cpu_number();
	mp_enable_preemption();
}
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
1c79356b	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
8f6c56a5	5	*
2d21ac55 A	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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	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.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
1c79356b A	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
1c79356b A	56	/*
	57	* xpr silent tracing circular buffer.
	58	*/
	59
1c79356b A	60	#include <mach/machine/vm_types.h>
	61	#include <kern/xpr.h>
	62	#include <kern/lock.h>
	63	#include <kern/spl.h>
	64	#include <kern/cpu_number.h>
	65	#include <kern/misc_protos.h>
	66	#include <kern/thread.h>
	67	#include <vm/vm_kern.h>
	68	#include <string.h>
	69
	70	/*
	71	* After a spontaneous reboot, it is desirable to look
	72	* at the old xpr buffer. Assuming xprbootstrap allocates
	73	* the buffer in the same place in physical memory and
	74	* the reboot doesn't clear memory, this should work.
	75	* xprptr will be reset, but the saved value should be OK.
	76	* Just set xprenable false so the buffer isn't overwritten.
	77	*/
	78
	79	decl_simple_lock_data(,xprlock)
	80	boolean_t xprenable = TRUE; /* Enable xpr tracing */
	81	int nxprbufs = 0; /* Number of contiguous xprbufs allocated */
	82	int xprflags = 0; /* Bit mask of xpr flags enabled */
	83	struct xprbuf xprbase; / Pointer to circular buffer nxprbufssizeof(xprbuf)/
	84	struct xprbuf xprptr; / Currently allocated xprbuf */
	85	struct xprbuf xprlast; / Pointer to end of circular buffer */
	86
	87	void
	88	xpr(
91447636 A	89	const char *msg,
	90	long arg1,
	91	long arg2,
	92	long arg3,
	93	long arg4,
	94	long arg5)
1c79356b A	95	{
	96	spl_t s;
	97	register struct xprbuf *x;
	98
	99	/* If we aren't initialized, ignore trace request */
	100	if (!xprenable \|\| (xprptr == 0))
	101	return;
	102	/* Guard against all interrupts and allocate next buffer. */
	103
	104	s = splhigh();
	105	simple_lock(&xprlock);
	106	x = xprptr++;
	107	if (xprptr >= xprlast) {
	108	/* wrap around */
	109	xprptr = xprbase;
	110	}
	111	/* Save xprptr in allocated memory. */
	112	(struct xprbuf *)xprlast = xprptr;
	113	simple_unlock(&xprlock);
	114	x->timestamp = XPR_TIMESTAMP;
	115	splx(s);
	116	x->msg = msg;
	117	x->arg1 = arg1;
	118	x->arg2 = arg2;
	119	x->arg3 = arg3;
	120	x->arg4 = arg4;
	121	x->arg5 = arg5;
	122	mp_disable_preemption();
	123	x->cpuinfo = cpu_number();
	124	mp_enable_preemption();
	125	}
	126