1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: utxfinit - External interfaces for ACPICA initialization
5 *
6 * Copyright (C) 2000 - 2025, Intel Corp.
7 *
8 *****************************************************************************/
9
10#define EXPORT_ACPI_INTERFACES
11
12#include <acpi/acpi.h>
13#include "accommon.h"
14#include "acevents.h"
15#include "acnamesp.h"
16#include "acdebug.h"
17#include "actables.h"
18
19#define _COMPONENT ACPI_UTILITIES
20ACPI_MODULE_NAME("utxfinit")
21
22/* For acpi_exec only */
23void ae_do_object_overrides(void);
24
25/*******************************************************************************
26 *
27 * FUNCTION: acpi_initialize_subsystem
28 *
29 * PARAMETERS: None
30 *
31 * RETURN: Status
32 *
33 * DESCRIPTION: Initializes all global variables. This is the first function
34 * called, so any early initialization belongs here.
35 *
36 ******************************************************************************/
37
38acpi_status ACPI_INIT_FUNCTION acpi_initialize_subsystem(void)
39{
40 acpi_status status;
41
42 ACPI_FUNCTION_TRACE(acpi_initialize_subsystem);
43
44 acpi_gbl_startup_flags = ACPI_SUBSYSTEM_INITIALIZE;
45 ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());
46
47 /* Initialize the OS-Dependent layer */
48
49 status = acpi_os_initialize();
50 if (ACPI_FAILURE(status)) {
51 ACPI_EXCEPTION((AE_INFO, status, "During OSL initialization"));
52 return_ACPI_STATUS(status);
53 }
54
55 /* Initialize all globals used by the subsystem */
56
57 status = acpi_ut_init_globals();
58 if (ACPI_FAILURE(status)) {
59 ACPI_EXCEPTION((AE_INFO, status,
60 "During initialization of globals"));
61 return_ACPI_STATUS(status);
62 }
63
64 /* Create the default mutex objects */
65
66 status = acpi_ut_mutex_initialize();
67 if (ACPI_FAILURE(status)) {
68 ACPI_EXCEPTION((AE_INFO, status,
69 "During Global Mutex creation"));
70 return_ACPI_STATUS(status);
71 }
72
73 /*
74 * Initialize the namespace manager and
75 * the root of the namespace tree
76 */
77 status = acpi_ns_root_initialize();
78 if (ACPI_FAILURE(status)) {
79 ACPI_EXCEPTION((AE_INFO, status,
80 "During Namespace initialization"));
81 return_ACPI_STATUS(status);
82 }
83
84 /* Initialize the global OSI interfaces list with the static names */
85
86 status = acpi_ut_initialize_interfaces();
87 if (ACPI_FAILURE(status)) {
88 ACPI_EXCEPTION((AE_INFO, status,
89 "During OSI interfaces initialization"));
90 return_ACPI_STATUS(status);
91 }
92
93 return_ACPI_STATUS(AE_OK);
94}
95
96ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_subsystem)
97
98/*******************************************************************************
99 *
100 * FUNCTION: acpi_enable_subsystem
101 *
102 * PARAMETERS: flags - Init/enable Options
103 *
104 * RETURN: Status
105 *
106 * DESCRIPTION: Completes the subsystem initialization including hardware.
107 * Puts system into ACPI mode if it isn't already.
108 *
109 ******************************************************************************/
110acpi_status ACPI_INIT_FUNCTION acpi_enable_subsystem(u32 flags)
111{
112 acpi_status status = AE_OK;
113
114 ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
115
116 /*
117 * The early initialization phase is complete. The namespace is loaded,
118 * and we can now support address spaces other than Memory, I/O, and
119 * PCI_Config.
120 */
121 acpi_gbl_early_initialization = FALSE;
122
123 /*
124 * Obtain a permanent mapping for the FACS. This is required for the
125 * Global Lock and the Firmware Waking Vector
126 */
127 if (!(flags & ACPI_NO_FACS_INIT)) {
128 status = acpi_tb_initialize_facs();
129 if (ACPI_FAILURE(status)) {
130 ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
131 return_ACPI_STATUS(status);
132 }
133 }
134
135#if (!ACPI_REDUCED_HARDWARE)
136
137 /* Enable ACPI mode */
138
139 if (!(flags & ACPI_NO_ACPI_ENABLE)) {
140 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
141 "[Init] Going into ACPI mode\n"));
142
143 acpi_gbl_original_mode = acpi_hw_get_mode();
144
145 status = acpi_enable();
146 if (ACPI_FAILURE(status)) {
147 ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
148 return_ACPI_STATUS(status);
149 }
150 }
151
152 /*
153 * Initialize ACPI Event handling (Fixed and General Purpose)
154 *
155 * Note1: We must have the hardware and events initialized before we can
156 * execute any control methods safely. Any control method can require
157 * ACPI hardware support, so the hardware must be fully initialized before
158 * any method execution!
159 *
160 * Note2: Fixed events are initialized and enabled here. GPEs are
161 * initialized, but cannot be enabled until after the hardware is
162 * completely initialized (SCI and global_lock activated) and the various
163 * initialization control methods are run (_REG, _STA, _INI) on the
164 * entire namespace.
165 */
166 if (!(flags & ACPI_NO_EVENT_INIT)) {
167 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
168 "[Init] Initializing ACPI events\n"));
169
170 status = acpi_ev_initialize_events();
171 if (ACPI_FAILURE(status)) {
172 return_ACPI_STATUS(status);
173 }
174 }
175
176 /*
177 * Install the SCI handler and Global Lock handler. This completes the
178 * hardware initialization.
179 */
180 if (!(flags & ACPI_NO_HANDLER_INIT)) {
181 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
182 "[Init] Installing SCI/GL handlers\n"));
183
184 status = acpi_ev_install_xrupt_handlers();
185 if (ACPI_FAILURE(status)) {
186 return_ACPI_STATUS(status);
187 }
188 }
189#endif /* !ACPI_REDUCED_HARDWARE */
190
191 return_ACPI_STATUS(status);
192}
193
194ACPI_EXPORT_SYMBOL_INIT(acpi_enable_subsystem)
195
196/*******************************************************************************
197 *
198 * FUNCTION: acpi_initialize_objects
199 *
200 * PARAMETERS: flags - Init/enable Options
201 *
202 * RETURN: Status
203 *
204 * DESCRIPTION: Completes namespace initialization by initializing device
205 * objects and executing AML code for Regions, buffers, etc.
206 *
207 ******************************************************************************/
208acpi_status ACPI_INIT_FUNCTION acpi_initialize_objects(u32 flags)
209{
210 acpi_status status = AE_OK;
211
212 ACPI_FUNCTION_TRACE(acpi_initialize_objects);
213
214#ifdef ACPI_OBSOLETE_BEHAVIOR
215 /*
216 * 05/2019: Removed, initialization now happens at both object
217 * creation and table load time
218 */
219
220 /*
221 * Initialize the objects that remain uninitialized. This
222 * runs the executable AML that may be part of the
223 * declaration of these objects: operation_regions, buffer_fields,
224 * bank_fields, Buffers, and Packages.
225 */
226 if (!(flags & ACPI_NO_OBJECT_INIT)) {
227 status = acpi_ns_initialize_objects();
228 if (ACPI_FAILURE(status)) {
229 return_ACPI_STATUS(status);
230 }
231 }
232#endif
233
234 /*
235 * Initialize all device/region objects in the namespace. This runs
236 * the device _STA and _INI methods and region _REG methods.
237 */
238 if (!(flags & (ACPI_NO_DEVICE_INIT | ACPI_NO_ADDRESS_SPACE_INIT))) {
239 status = acpi_ns_initialize_devices(flags);
240 if (ACPI_FAILURE(status)) {
241 return_ACPI_STATUS(status);
242 }
243 }
244
245 /*
246 * Empty the caches (delete the cached objects) on the assumption that
247 * the table load filled them up more than they will be at runtime --
248 * thus wasting non-paged memory.
249 */
250 status = acpi_purge_cached_objects();
251
252 acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
253 return_ACPI_STATUS(status);
254}
255
256ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_objects)
257