/* * 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(); }