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1 : : // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 : : /******************************************************************************
3 : : *
4 : : * Module Name: utosi - Support for the _OSI predefined control method
5 : : *
6 : : * Copyright (C) 2000 - 2020, Intel Corp.
7 : : *
8 : : *****************************************************************************/
9 : :
10 : : #include <acpi/acpi.h>
11 : : #include "accommon.h"
12 : :
13 : : #define _COMPONENT ACPI_UTILITIES
14 : : ACPI_MODULE_NAME("utosi")
15 : :
16 : : /******************************************************************************
17 : : *
18 : : * ACPICA policy for new _OSI strings:
19 : : *
20 : : * It is the stated policy of ACPICA that new _OSI strings will be integrated
21 : : * into this module as soon as possible after they are defined. It is strongly
22 : : * recommended that all ACPICA hosts mirror this policy and integrate any
23 : : * changes to this module as soon as possible. There are several historical
24 : : * reasons behind this policy:
25 : : *
26 : : * 1) New BIOSs tend to test only the case where the host responds TRUE to
27 : : * the latest version of Windows, which would respond to the latest/newest
28 : : * _OSI string. Not responding TRUE to the latest version of Windows will
29 : : * risk executing untested code paths throughout the DSDT and SSDTs.
30 : : *
31 : : * 2) If a new _OSI string is recognized only after a significant delay, this
32 : : * has the potential to cause problems on existing working machines because
33 : : * of the possibility that a new and different path through the ASL code
34 : : * will be executed.
35 : : *
36 : : * 3) New _OSI strings are tending to come out about once per year. A delay
37 : : * in recognizing a new string for a significant amount of time risks the
38 : : * release of another string which only compounds the initial problem.
39 : : *
40 : : *****************************************************************************/
41 : : /*
42 : : * Strings supported by the _OSI predefined control method (which is
43 : : * implemented internally within this module.)
44 : : *
45 : : * March 2009: Removed "Linux" as this host no longer wants to respond true
46 : : * for this string. Basically, the only safe OS strings are windows-related
47 : : * and in many or most cases represent the only test path within the
48 : : * BIOS-provided ASL code.
49 : : *
50 : : * The last element of each entry is used to track the newest version of
51 : : * Windows that the BIOS has requested.
52 : : */
53 : : static struct acpi_interface_info acpi_default_supported_interfaces[] = {
54 : : /* Operating System Vendor Strings */
55 : :
56 : : {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000}, /* Windows 2000 */
57 : : {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP}, /* Windows XP */
58 : : {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1}, /* Windows XP SP1 */
59 : : {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003}, /* Windows Server 2003 */
60 : : {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2}, /* Windows XP SP2 */
61 : : {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1}, /* Windows Server 2003 SP1 - Added 03/2006 */
62 : : {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA}, /* Windows vista - Added 03/2006 */
63 : : {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008}, /* Windows Server 2008 - Added 09/2009 */
64 : : {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1}, /* Windows Vista SP1 - Added 09/2009 */
65 : : {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2}, /* Windows Vista SP2 - Added 09/2010 */
66 : : {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7}, /* Windows 7 and Server 2008 R2 - Added 09/2009 */
67 : : {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8}, /* Windows 8 and Server 2012 - Added 08/2012 */
68 : : {"Windows 2013", NULL, 0, ACPI_OSI_WIN_8_1}, /* Windows 8.1 and Server 2012 R2 - Added 01/2014 */
69 : : {"Windows 2015", NULL, 0, ACPI_OSI_WIN_10}, /* Windows 10 - Added 03/2015 */
70 : : {"Windows 2016", NULL, 0, ACPI_OSI_WIN_10_RS1}, /* Windows 10 version 1607 - Added 12/2017 */
71 : : {"Windows 2017", NULL, 0, ACPI_OSI_WIN_10_RS2}, /* Windows 10 version 1703 - Added 12/2017 */
72 : : {"Windows 2017.2", NULL, 0, ACPI_OSI_WIN_10_RS3}, /* Windows 10 version 1709 - Added 02/2018 */
73 : : {"Windows 2018", NULL, 0, ACPI_OSI_WIN_10_RS4}, /* Windows 10 version 1803 - Added 11/2018 */
74 : : {"Windows 2018.2", NULL, 0, ACPI_OSI_WIN_10_RS5}, /* Windows 10 version 1809 - Added 11/2018 */
75 : : {"Windows 2019", NULL, 0, ACPI_OSI_WIN_10_19H1}, /* Windows 10 version 1903 - Added 08/2019 */
76 : :
77 : : /* Feature Group Strings */
78 : :
79 : : {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
80 : :
81 : : /*
82 : : * All "optional" feature group strings (features that are implemented
83 : : * by the host) should be dynamically modified to VALID by the host via
84 : : * acpi_install_interface or acpi_update_interfaces. Such optional feature
85 : : * group strings are set as INVALID by default here.
86 : : */
87 : :
88 : : {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
89 : : {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
90 : : {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
91 : : {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
92 : : {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
93 : : };
94 : :
95 : : /*******************************************************************************
96 : : *
97 : : * FUNCTION: acpi_ut_initialize_interfaces
98 : : *
99 : : * PARAMETERS: None
100 : : *
101 : : * RETURN: Status
102 : : *
103 : : * DESCRIPTION: Initialize the global _OSI supported interfaces list
104 : : *
105 : : ******************************************************************************/
106 : :
107 : 3 : acpi_status acpi_ut_initialize_interfaces(void)
108 : : {
109 : 3 : acpi_status status;
110 : 3 : u32 i;
111 : :
112 : 3 : status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
113 [ + - ]: 3 : if (ACPI_FAILURE(status)) {
114 : : return (status);
115 : : }
116 : :
117 : 3 : acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
118 : :
119 : : /* Link the static list of supported interfaces */
120 : :
121 : 3 : for (i = 0;
122 [ + + ]: 78 : i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
123 : 75 : i++) {
124 : 75 : acpi_default_supported_interfaces[i].next =
125 : 75 : &acpi_default_supported_interfaces[(acpi_size)i + 1];
126 : : }
127 : :
128 : 3 : acpi_os_release_mutex(acpi_gbl_osi_mutex);
129 : 3 : return (AE_OK);
130 : : }
131 : :
132 : : /*******************************************************************************
133 : : *
134 : : * FUNCTION: acpi_ut_interface_terminate
135 : : *
136 : : * PARAMETERS: None
137 : : *
138 : : * RETURN: Status
139 : : *
140 : : * DESCRIPTION: Delete all interfaces in the global list. Sets
141 : : * acpi_gbl_supported_interfaces to NULL.
142 : : *
143 : : ******************************************************************************/
144 : :
145 : 0 : acpi_status acpi_ut_interface_terminate(void)
146 : : {
147 : 0 : acpi_status status;
148 : 0 : struct acpi_interface_info *next_interface;
149 : :
150 : 0 : status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
151 [ # # ]: 0 : if (ACPI_FAILURE(status)) {
152 : : return (status);
153 : : }
154 : :
155 : 0 : next_interface = acpi_gbl_supported_interfaces;
156 [ # # ]: 0 : while (next_interface) {
157 : 0 : acpi_gbl_supported_interfaces = next_interface->next;
158 : :
159 [ # # ]: 0 : if (next_interface->flags & ACPI_OSI_DYNAMIC) {
160 : :
161 : : /* Only interfaces added at runtime can be freed */
162 : :
163 : 0 : ACPI_FREE(next_interface->name);
164 : 0 : ACPI_FREE(next_interface);
165 : : } else {
166 : : /* Interface is in static list. Reset it to invalid or valid. */
167 : :
168 [ # # ]: 0 : if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {
169 : 0 : next_interface->flags |= ACPI_OSI_INVALID;
170 : : } else {
171 : 0 : next_interface->flags &= ~ACPI_OSI_INVALID;
172 : : }
173 : : }
174 : :
175 : 0 : next_interface = acpi_gbl_supported_interfaces;
176 : : }
177 : :
178 : 0 : acpi_os_release_mutex(acpi_gbl_osi_mutex);
179 : 0 : return (AE_OK);
180 : : }
181 : :
182 : : /*******************************************************************************
183 : : *
184 : : * FUNCTION: acpi_ut_install_interface
185 : : *
186 : : * PARAMETERS: interface_name - The interface to install
187 : : *
188 : : * RETURN: Status
189 : : *
190 : : * DESCRIPTION: Install the interface into the global interface list.
191 : : * Caller MUST hold acpi_gbl_osi_mutex
192 : : *
193 : : ******************************************************************************/
194 : :
195 : 9 : acpi_status acpi_ut_install_interface(acpi_string interface_name)
196 : : {
197 : 9 : struct acpi_interface_info *interface_info;
198 : :
199 : : /* Allocate info block and space for the name string */
200 : :
201 : 9 : interface_info =
202 : 9 : ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
203 [ + - ]: 9 : if (!interface_info) {
204 : : return (AE_NO_MEMORY);
205 : : }
206 : :
207 : 9 : interface_info->name = ACPI_ALLOCATE_ZEROED(strlen(interface_name) + 1);
208 [ - + ]: 9 : if (!interface_info->name) {
209 : 0 : ACPI_FREE(interface_info);
210 : 0 : return (AE_NO_MEMORY);
211 : : }
212 : :
213 : : /* Initialize new info and insert at the head of the global list */
214 : :
215 : 9 : strcpy(interface_info->name, interface_name);
216 : 9 : interface_info->flags = ACPI_OSI_DYNAMIC;
217 : 9 : interface_info->next = acpi_gbl_supported_interfaces;
218 : :
219 : 9 : acpi_gbl_supported_interfaces = interface_info;
220 : 9 : return (AE_OK);
221 : : }
222 : :
223 : : /*******************************************************************************
224 : : *
225 : : * FUNCTION: acpi_ut_remove_interface
226 : : *
227 : : * PARAMETERS: interface_name - The interface to remove
228 : : *
229 : : * RETURN: Status
230 : : *
231 : : * DESCRIPTION: Remove the interface from the global interface list.
232 : : * Caller MUST hold acpi_gbl_osi_mutex
233 : : *
234 : : ******************************************************************************/
235 : :
236 : 0 : acpi_status acpi_ut_remove_interface(acpi_string interface_name)
237 : : {
238 : 0 : struct acpi_interface_info *previous_interface;
239 : 0 : struct acpi_interface_info *next_interface;
240 : :
241 : 0 : previous_interface = next_interface = acpi_gbl_supported_interfaces;
242 [ # # ]: 0 : while (next_interface) {
243 [ # # ]: 0 : if (!strcmp(interface_name, next_interface->name)) {
244 : : /*
245 : : * Found: name is in either the static list
246 : : * or was added at runtime
247 : : */
248 [ # # ]: 0 : if (next_interface->flags & ACPI_OSI_DYNAMIC) {
249 : :
250 : : /* Interface was added dynamically, remove and free it */
251 : :
252 [ # # ]: 0 : if (previous_interface == next_interface) {
253 : 0 : acpi_gbl_supported_interfaces =
254 : 0 : next_interface->next;
255 : : } else {
256 : 0 : previous_interface->next =
257 : 0 : next_interface->next;
258 : : }
259 : :
260 : 0 : ACPI_FREE(next_interface->name);
261 : 0 : ACPI_FREE(next_interface);
262 : : } else {
263 : : /*
264 : : * Interface is in static list. If marked invalid, then
265 : : * it does not actually exist. Else, mark it invalid.
266 : : */
267 [ # # ]: 0 : if (next_interface->flags & ACPI_OSI_INVALID) {
268 : : return (AE_NOT_EXIST);
269 : : }
270 : :
271 : 0 : next_interface->flags |= ACPI_OSI_INVALID;
272 : : }
273 : :
274 : 0 : return (AE_OK);
275 : : }
276 : :
277 : 0 : previous_interface = next_interface;
278 : 0 : next_interface = next_interface->next;
279 : : }
280 : :
281 : : /* Interface was not found */
282 : :
283 : : return (AE_NOT_EXIST);
284 : : }
285 : :
286 : : /*******************************************************************************
287 : : *
288 : : * FUNCTION: acpi_ut_update_interfaces
289 : : *
290 : : * PARAMETERS: action - Actions to be performed during the
291 : : * update
292 : : *
293 : : * RETURN: Status
294 : : *
295 : : * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
296 : : * strings or/and feature group strings.
297 : : * Caller MUST hold acpi_gbl_osi_mutex
298 : : *
299 : : ******************************************************************************/
300 : :
301 : 0 : acpi_status acpi_ut_update_interfaces(u8 action)
302 : : {
303 : 0 : struct acpi_interface_info *next_interface;
304 : :
305 : 0 : next_interface = acpi_gbl_supported_interfaces;
306 [ # # ]: 0 : while (next_interface) {
307 [ # # # # ]: 0 : if (((next_interface->flags & ACPI_OSI_FEATURE) &&
308 [ # # ]: 0 : (action & ACPI_FEATURE_STRINGS)) ||
309 [ # # ]: 0 : (!(next_interface->flags & ACPI_OSI_FEATURE) &&
310 : : (action & ACPI_VENDOR_STRINGS))) {
311 [ # # ]: 0 : if (action & ACPI_DISABLE_INTERFACES) {
312 : :
313 : : /* Mark the interfaces as invalid */
314 : :
315 : 0 : next_interface->flags |= ACPI_OSI_INVALID;
316 : : } else {
317 : : /* Mark the interfaces as valid */
318 : :
319 : 0 : next_interface->flags &= ~ACPI_OSI_INVALID;
320 : : }
321 : : }
322 : :
323 : 0 : next_interface = next_interface->next;
324 : : }
325 : :
326 : 0 : return (AE_OK);
327 : : }
328 : :
329 : : /*******************************************************************************
330 : : *
331 : : * FUNCTION: acpi_ut_get_interface
332 : : *
333 : : * PARAMETERS: interface_name - The interface to find
334 : : *
335 : : * RETURN: struct acpi_interface_info if found. NULL if not found.
336 : : *
337 : : * DESCRIPTION: Search for the specified interface name in the global list.
338 : : * Caller MUST hold acpi_gbl_osi_mutex
339 : : *
340 : : ******************************************************************************/
341 : :
342 : 21 : struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
343 : : {
344 : 21 : struct acpi_interface_info *next_interface;
345 : :
346 : 21 : next_interface = acpi_gbl_supported_interfaces;
347 [ + + ]: 540 : while (next_interface) {
348 [ + + ]: 531 : if (!strcmp(interface_name, next_interface->name)) {
349 : 12 : return (next_interface);
350 : : }
351 : :
352 : 519 : next_interface = next_interface->next;
353 : : }
354 : :
355 : : return (NULL);
356 : : }
357 : :
358 : : /*******************************************************************************
359 : : *
360 : : * FUNCTION: acpi_ut_osi_implementation
361 : : *
362 : : * PARAMETERS: walk_state - Current walk state
363 : : *
364 : : * RETURN: Status
365 : : * Integer: TRUE (0) if input string is matched
366 : : * FALSE (-1) if string is not matched
367 : : *
368 : : * DESCRIPTION: Implementation of the _OSI predefined control method. When
369 : : * an invocation of _OSI is encountered in the system AML,
370 : : * control is transferred to this function.
371 : : *
372 : : * (August 2016)
373 : : * Note: _OSI is now defined to return "Ones" to indicate a match, for
374 : : * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones
375 : : * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF
376 : : * (ACPI_UINT64_MAX).
377 : : *
378 : : * This function always returns ACPI_UINT64_MAX for TRUE, and later code
379 : : * will truncate this to 32 bits if necessary.
380 : : *
381 : : ******************************************************************************/
382 : :
383 : 0 : acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
384 : : {
385 : 0 : union acpi_operand_object *string_desc;
386 : 0 : union acpi_operand_object *return_desc;
387 : 0 : struct acpi_interface_info *interface_info;
388 : 0 : acpi_interface_handler interface_handler;
389 : 0 : acpi_status status;
390 : 0 : u64 return_value;
391 : :
392 : 0 : ACPI_FUNCTION_TRACE(ut_osi_implementation);
393 : :
394 : : /* Validate the string input argument (from the AML caller) */
395 : :
396 : 0 : string_desc = walk_state->arguments[0].object;
397 [ # # # # ]: 0 : if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
398 : : return_ACPI_STATUS(AE_TYPE);
399 : : }
400 : :
401 : : /* Create a return object */
402 : :
403 : 0 : return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
404 [ # # ]: 0 : if (!return_desc) {
405 : : return_ACPI_STATUS(AE_NO_MEMORY);
406 : : }
407 : :
408 : : /* Default return value is 0, NOT SUPPORTED */
409 : :
410 : 0 : return_value = 0;
411 : 0 : status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
412 [ # # ]: 0 : if (ACPI_FAILURE(status)) {
413 : 0 : acpi_ut_remove_reference(return_desc);
414 : 0 : return_ACPI_STATUS(status);
415 : : }
416 : :
417 : : /* Lookup the interface in the global _OSI list */
418 : :
419 : 0 : interface_info = acpi_ut_get_interface(string_desc->string.pointer);
420 [ # # # # ]: 0 : if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
421 : : /*
422 : : * The interface is supported.
423 : : * Update the osi_data if necessary. We keep track of the latest
424 : : * version of Windows that has been requested by the BIOS.
425 : : */
426 [ # # ]: 0 : if (interface_info->value > acpi_gbl_osi_data) {
427 : 0 : acpi_gbl_osi_data = interface_info->value;
428 : : }
429 : :
430 : : return_value = ACPI_UINT64_MAX;
431 : : }
432 : :
433 : 0 : acpi_os_release_mutex(acpi_gbl_osi_mutex);
434 : :
435 : : /*
436 : : * Invoke an optional _OSI interface handler. The host OS may wish
437 : : * to do some interface-specific handling. For example, warn about
438 : : * certain interfaces or override the true/false support value.
439 : : */
440 : 0 : interface_handler = acpi_gbl_interface_handler;
441 [ # # ]: 0 : if (interface_handler) {
442 [ # # ]: 0 : if (interface_handler
443 : : (string_desc->string.pointer, (u32)return_value)) {
444 : 0 : return_value = ACPI_UINT64_MAX;
445 : : }
446 : : }
447 : :
448 : : ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
449 : : "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
450 : : string_desc->string.pointer,
451 : 0 : return_value == 0 ? "not " : ""));
452 : :
453 : : /* Complete the return object */
454 : :
455 : 0 : return_desc->integer.value = return_value;
456 : 0 : walk_state->return_desc = return_desc;
457 : 0 : return_ACPI_STATUS(AE_OK);
458 : : }
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