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 - 2019, 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
acpi_ut_initialize_interfaces(void)107 acpi_status acpi_ut_initialize_interfaces(void)
108 {
109 acpi_status status;
110 u32 i;
111
112 status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
113 if (ACPI_FAILURE(status)) {
114 return (status);
115 }
116
117 acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
118
119 /* Link the static list of supported interfaces */
120
121 for (i = 0;
122 i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
123 i++) {
124 acpi_default_supported_interfaces[i].next =
125 &acpi_default_supported_interfaces[(acpi_size)i + 1];
126 }
127
128 acpi_os_release_mutex(acpi_gbl_osi_mutex);
129 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
acpi_ut_interface_terminate(void)145 acpi_status acpi_ut_interface_terminate(void)
146 {
147 acpi_status status;
148 struct acpi_interface_info *next_interface;
149
150 status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
151 if (ACPI_FAILURE(status)) {
152 return (status);
153 }
154
155 next_interface = acpi_gbl_supported_interfaces;
156 while (next_interface) {
157 acpi_gbl_supported_interfaces = next_interface->next;
158
159 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
160
161 /* Only interfaces added at runtime can be freed */
162
163 ACPI_FREE(next_interface->name);
164 ACPI_FREE(next_interface);
165 } else {
166 /* Interface is in static list. Reset it to invalid or valid. */
167
168 if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {
169 next_interface->flags |= ACPI_OSI_INVALID;
170 } else {
171 next_interface->flags &= ~ACPI_OSI_INVALID;
172 }
173 }
174
175 next_interface = acpi_gbl_supported_interfaces;
176 }
177
178 acpi_os_release_mutex(acpi_gbl_osi_mutex);
179 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
acpi_ut_install_interface(acpi_string interface_name)195 acpi_status acpi_ut_install_interface(acpi_string interface_name)
196 {
197 struct acpi_interface_info *interface_info;
198
199 /* Allocate info block and space for the name string */
200
201 interface_info =
202 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
203 if (!interface_info) {
204 return (AE_NO_MEMORY);
205 }
206
207 interface_info->name = ACPI_ALLOCATE_ZEROED(strlen(interface_name) + 1);
208 if (!interface_info->name) {
209 ACPI_FREE(interface_info);
210 return (AE_NO_MEMORY);
211 }
212
213 /* Initialize new info and insert at the head of the global list */
214
215 strcpy(interface_info->name, interface_name);
216 interface_info->flags = ACPI_OSI_DYNAMIC;
217 interface_info->next = acpi_gbl_supported_interfaces;
218
219 acpi_gbl_supported_interfaces = interface_info;
220 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
acpi_ut_remove_interface(acpi_string interface_name)236 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
237 {
238 struct acpi_interface_info *previous_interface;
239 struct acpi_interface_info *next_interface;
240
241 previous_interface = next_interface = acpi_gbl_supported_interfaces;
242 while (next_interface) {
243 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 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
249
250 /* Interface was added dynamically, remove and free it */
251
252 if (previous_interface == next_interface) {
253 acpi_gbl_supported_interfaces =
254 next_interface->next;
255 } else {
256 previous_interface->next =
257 next_interface->next;
258 }
259
260 ACPI_FREE(next_interface->name);
261 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 if (next_interface->flags & ACPI_OSI_INVALID) {
268 return (AE_NOT_EXIST);
269 }
270
271 next_interface->flags |= ACPI_OSI_INVALID;
272 }
273
274 return (AE_OK);
275 }
276
277 previous_interface = next_interface;
278 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
acpi_ut_update_interfaces(u8 action)301 acpi_status acpi_ut_update_interfaces(u8 action)
302 {
303 struct acpi_interface_info *next_interface;
304
305 next_interface = acpi_gbl_supported_interfaces;
306 while (next_interface) {
307 if (((next_interface->flags & ACPI_OSI_FEATURE) &&
308 (action & ACPI_FEATURE_STRINGS)) ||
309 (!(next_interface->flags & ACPI_OSI_FEATURE) &&
310 (action & ACPI_VENDOR_STRINGS))) {
311 if (action & ACPI_DISABLE_INTERFACES) {
312
313 /* Mark the interfaces as invalid */
314
315 next_interface->flags |= ACPI_OSI_INVALID;
316 } else {
317 /* Mark the interfaces as valid */
318
319 next_interface->flags &= ~ACPI_OSI_INVALID;
320 }
321 }
322
323 next_interface = next_interface->next;
324 }
325
326 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
acpi_ut_get_interface(acpi_string interface_name)342 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
343 {
344 struct acpi_interface_info *next_interface;
345
346 next_interface = acpi_gbl_supported_interfaces;
347 while (next_interface) {
348 if (!strcmp(interface_name, next_interface->name)) {
349 return (next_interface);
350 }
351
352 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
acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)383 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
384 {
385 union acpi_operand_object *string_desc;
386 union acpi_operand_object *return_desc;
387 struct acpi_interface_info *interface_info;
388 acpi_interface_handler interface_handler;
389 acpi_status status;
390 u64 return_value;
391
392 ACPI_FUNCTION_TRACE(ut_osi_implementation);
393
394 /* Validate the string input argument (from the AML caller) */
395
396 string_desc = walk_state->arguments[0].object;
397 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 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
404 if (!return_desc) {
405 return_ACPI_STATUS(AE_NO_MEMORY);
406 }
407
408 /* Default return value is 0, NOT SUPPORTED */
409
410 return_value = 0;
411 status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
412 if (ACPI_FAILURE(status)) {
413 acpi_ut_remove_reference(return_desc);
414 return_ACPI_STATUS(status);
415 }
416
417 /* Lookup the interface in the global _OSI list */
418
419 interface_info = acpi_ut_get_interface(string_desc->string.pointer);
420 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 if (interface_info->value > acpi_gbl_osi_data) {
427 acpi_gbl_osi_data = interface_info->value;
428 }
429
430 return_value = ACPI_UINT64_MAX;
431 }
432
433 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 interface_handler = acpi_gbl_interface_handler;
441 if (interface_handler) {
442 if (interface_handler
443 (string_desc->string.pointer, (u32)return_value)) {
444 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 return_value == 0 ? "not " : ""));
452
453 /* Complete the return object */
454
455 return_desc->integer.value = return_value;
456 walk_state->return_desc = return_desc;
457 return_ACPI_STATUS(AE_OK);
458 }
459
