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
40static int
41get_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
64SYSCTL_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