1/* 2 * Copyright (c) 2000-2005 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 * @OSF_COPYRIGHT@ 30 */ 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 */ 56/* 57 * xpr silent tracing circular buffer. 58 */ 59 60#include <mach/machine/vm_types.h> 61#include <kern/xpr.h> 62#include <kern/spl.h> 63#include <kern/cpu_number.h> 64#include <kern/misc_protos.h> 65#include <kern/thread.h> 66#include <vm/vm_kern.h> 67#include <string.h> 68 69/* 70 * After a spontaneous reboot, it is desirable to look 71 * at the old xpr buffer. Assuming xprbootstrap allocates 72 * the buffer in the same place in physical memory and 73 * the reboot doesn't clear memory, this should work. 74 * xprptr will be reset, but the saved value should be OK. 75 * Just set xprenable false so the buffer isn't overwritten. 76 */ 77 78decl_simple_lock_data(,xprlock) 79boolean_t xprenable = TRUE; /* Enable xpr tracing */ 80int nxprbufs = 0; /* Number of contiguous xprbufs allocated */ 81int xprflags = 0; /* Bit mask of xpr flags enabled */ 82struct xprbuf *xprbase; /* Pointer to circular buffer nxprbufs*sizeof(xprbuf)*/ 83struct xprbuf *xprptr; /* Currently allocated xprbuf */ 84struct xprbuf *xprlast; /* Pointer to end of circular buffer */ 85 86void 87xpr( 88 const char *msg, 89 long arg1, 90 long arg2, 91 long arg3, 92 long arg4, 93 long arg5) 94{ 95 spl_t s; 96 register struct xprbuf *x; 97 98 /* If we aren't initialized, ignore trace request */ 99 if (!xprenable || (xprptr == 0)) 100 return; 101 /* Guard against all interrupts and allocate next buffer. */ 102 103 s = splhigh(); 104 simple_lock(&xprlock); 105 x = xprptr++; 106 if (xprptr >= xprlast) { 107 /* wrap around */ 108 xprptr = xprbase; 109 } 110 /* Save xprptr in allocated memory. */ 111 *(struct xprbuf **)xprlast = xprptr; 112 simple_unlock(&xprlock); 113 x->timestamp = XPR_TIMESTAMP; 114 splx(s); 115 x->msg = msg; 116 x->arg1 = arg1; 117 x->arg2 = arg2; 118 x->arg3 = arg3; 119 x->arg4 = arg4; 120 x->arg5 = arg5; 121 mp_disable_preemption(); 122 x->cpuinfo = cpu_number(); 123 mp_enable_preemption(); 124} 125 126