1 /*
2 * Copyright (c) 2013 Apple 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 #include <kern/debug.h>
29 #include <sys/param.h>
30 #include <sys/mman.h>
31 #include <sys/stat.h>
32 #include <sys/sysctl.h>
33 #include <sys/priv.h>
34 #include <mach/machine.h>
35 #include <libkern/libkern.h>
36 #include <kern/assert.h>
37 #include <pexpert/pexpert.h>
38 #include <kern/ecc.h>
39
40 static int
get_ecc_data_handler(__unused struct sysctl_oid * oidp,__unused void * arg1,__unused int arg2,struct sysctl_req * req)41 get_ecc_data_handler(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2,
42 struct sysctl_req *req)
43 {
44 struct ecc_event ev;
45 int changed, retval;
46
47 if (priv_check_cred(kauth_cred_get(), PRIV_HW_DEBUG_DATA, 0) != 0) {
48 return EPERM;
49 }
50
51 if (KERN_SUCCESS != ecc_log_get_next_event(&ev)) {
52 /*
53 * EAGAIN would be better, but sysctl infrastructure
54 * interprets that */
55 return EBUSY;
56 }
57
58 retval = sysctl_io_opaque(req, &ev, sizeof(ev), &changed);
59 assert(!changed);
60
61 return retval;
62 }
63
64 SYSCTL_PROC(_kern, OID_AUTO, next_ecc_event,
65 CTLFLAG_RD | CTLFLAG_ANYBODY | CTLFLAG_MASKED | CTLTYPE_STRUCT,
66 0, 0, get_ecc_data_handler,
67 "-", "");
68