1 /*
2 * Copyright (c) 2012-2013 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
29 #include <atm/atm_internal.h>
30 #include <machine/commpage.h>
31 #include <pexpert/pexpert.h>
32
33 /*
34 * Global that is set by diagnosticd and readable by userspace
35 * via the commpage.
36 */
37 static uint32_t atm_diagnostic_config;
38 static bool disable_atm;
39
40 /*
41 * Routine: atm_init
42 * Purpose: Initialize the atm subsystem.
43 * Returns: None.
44 */
45 void
atm_init(void)46 atm_init(void)
47 {
48 char temp_buf[20];
49
50 /* Disable atm if disable_atm present in device-tree properties or in boot-args */
51 if ((PE_get_default("kern.disable_atm", temp_buf, sizeof(temp_buf))) ||
52 (PE_parse_boot_argn("-disable_atm", temp_buf, sizeof(temp_buf)))) {
53 disable_atm = true;
54 }
55
56 if (!PE_parse_boot_argn("atm_diagnostic_config", &atm_diagnostic_config, sizeof(atm_diagnostic_config))) {
57 if (!PE_get_default("kern.atm_diagnostic_config", &atm_diagnostic_config, sizeof(atm_diagnostic_config))) {
58 atm_diagnostic_config = 0;
59 }
60 }
61
62 kprintf("ATM subsystem is initialized\n");
63 }
64
65 /*
66 * Routine: atm_reset
67 * Purpose: re-initialize the atm subsystem (e.g. for userspace reboot)
68 * Returns: None.
69 */
70 void
atm_reset(void)71 atm_reset(void)
72 {
73 atm_init();
74 commpage_update_atm_diagnostic_config(atm_diagnostic_config);
75 }
76
77 /*
78 * Routine: atm_set_diagnostic_config
79 * Purpose: Set global atm_diagnostic_config and update the commpage to reflect
80 * the new value.
81 * Returns: Error if ATM is disabled.
82 */
83 kern_return_t
atm_set_diagnostic_config(uint32_t diagnostic_config)84 atm_set_diagnostic_config(uint32_t diagnostic_config)
85 {
86 if (disable_atm) {
87 return KERN_NOT_SUPPORTED;
88 }
89
90 atm_diagnostic_config = diagnostic_config;
91 commpage_update_atm_diagnostic_config(atm_diagnostic_config);
92
93 return KERN_SUCCESS;
94 }
95
96 /*
97 * Routine: atm_get_diagnostic_config
98 * Purpose: Get global atm_diagnostic_config.
99 * Returns: Diagnostic value
100 */
101 uint32_t
atm_get_diagnostic_config(void)102 atm_get_diagnostic_config(void)
103 {
104 return atm_diagnostic_config;
105 }
106