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 |
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(property_name: "kern.disable_atm" , property_ptr: temp_buf, max_property: sizeof(temp_buf))) || |
52 | (PE_parse_boot_argn(arg_string: "-disable_atm" , arg_ptr: temp_buf, max_arg: sizeof(temp_buf)))) { |
53 | disable_atm = true; |
54 | } |
55 | |
56 | if (!PE_parse_boot_argn(arg_string: "atm_diagnostic_config" , arg_ptr: &atm_diagnostic_config, max_arg: sizeof(atm_diagnostic_config))) { |
57 | if (!PE_get_default(property_name: "kern.atm_diagnostic_config" , property_ptr: &atm_diagnostic_config, max_property: sizeof(atm_diagnostic_config))) { |
58 | atm_diagnostic_config = 0; |
59 | } |
60 | } |
61 | |
62 | kprintf(fmt: "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 |
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 |
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 |
102 | atm_get_diagnostic_config(void) |
103 | { |
104 | return atm_diagnostic_config; |
105 | } |
106 | |