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1 /******************************************************************************
2  *
3  * Module Name: utosi - Support for the _OSI predefined control method
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2016, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43 
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 
47 #define _COMPONENT          ACPI_UTILITIES
48 ACPI_MODULE_NAME("utosi")
49 
50 /******************************************************************************
51  *
52  * ACPICA policy for new _OSI strings:
53  *
54  * It is the stated policy of ACPICA that new _OSI strings will be integrated
55  * into this module as soon as possible after they are defined. It is strongly
56  * recommended that all ACPICA hosts mirror this policy and integrate any
57  * changes to this module as soon as possible. There are several historical
58  * reasons behind this policy:
59  *
60  * 1) New BIOSs tend to test only the case where the host responds TRUE to
61  *    the latest version of Windows, which would respond to the latest/newest
62  *    _OSI string. Not responding TRUE to the latest version of Windows will
63  *    risk executing untested code paths throughout the DSDT and SSDTs.
64  *
65  * 2) If a new _OSI string is recognized only after a significant delay, this
66  *    has the potential to cause problems on existing working machines because
67  *    of the possibility that a new and different path through the ASL code
68  *    will be executed.
69  *
70  * 3) New _OSI strings are tending to come out about once per year. A delay
71  *    in recognizing a new string for a significant amount of time risks the
72  *    release of another string which only compounds the initial problem.
73  *
74  *****************************************************************************/
75 /*
76  * Strings supported by the _OSI predefined control method (which is
77  * implemented internally within this module.)
78  *
79  * March 2009: Removed "Linux" as this host no longer wants to respond true
80  * for this string. Basically, the only safe OS strings are windows-related
81  * and in many or most cases represent the only test path within the
82  * BIOS-provided ASL code.
83  *
84  * The last element of each entry is used to track the newest version of
85  * Windows that the BIOS has requested.
86  */
87 static struct acpi_interface_info acpi_default_supported_interfaces[] = {
88 	/* Operating System Vendor Strings */
89 
90 	{"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},	/* Windows 2000 */
91 	{"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},	/* Windows XP */
92 	{"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},	/* Windows XP SP1 */
93 	{"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},	/* Windows Server 2003 */
94 	{"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},	/* Windows XP SP2 */
95 	{"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},	/* Windows Server 2003 SP1 - Added 03/2006 */
96 	{"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},	/* Windows vista - Added 03/2006 */
97 	{"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},	/* Windows Server 2008 - Added 09/2009 */
98 	{"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},	/* Windows Vista SP1 - Added 09/2009 */
99 	{"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2},	/* Windows Vista SP2 - Added 09/2010 */
100 	{"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},	/* Windows 7 and Server 2008 R2 - Added 09/2009 */
101 	{"Windows 2012", NULL, 0, ACPI_OSI_WIN_8},	/* Windows 8 and Server 2012 - Added 08/2012 */
102 	{"Windows 2013", NULL, 0, ACPI_OSI_WIN_8},	/* Windows 8.1 and Server 2012 R2 - Added 01/2014 */
103 	{"Windows 2015", NULL, 0, ACPI_OSI_WIN_10},	/* Windows 10 - Added 03/2015 */
104 
105 	/* Feature Group Strings */
106 
107 	{"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
108 
109 	/*
110 	 * All "optional" feature group strings (features that are implemented
111 	 * by the host) should be dynamically modified to VALID by the host via
112 	 * acpi_install_interface or acpi_update_interfaces. Such optional feature
113 	 * group strings are set as INVALID by default here.
114 	 */
115 
116 	{"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
117 	{"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
118 	{"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
119 	{"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
120 	{"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
121 };
122 
123 /*******************************************************************************
124  *
125  * FUNCTION:    acpi_ut_initialize_interfaces
126  *
127  * PARAMETERS:  None
128  *
129  * RETURN:      Status
130  *
131  * DESCRIPTION: Initialize the global _OSI supported interfaces list
132  *
133  ******************************************************************************/
134 
acpi_ut_initialize_interfaces(void)135 acpi_status acpi_ut_initialize_interfaces(void)
136 {
137 	acpi_status status;
138 	u32 i;
139 
140 	status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
141 	if (ACPI_FAILURE(status)) {
142 		return (status);
143 	}
144 
145 	acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
146 
147 	/* Link the static list of supported interfaces */
148 
149 	for (i = 0;
150 	     i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
151 	     i++) {
152 		acpi_default_supported_interfaces[i].next =
153 		    &acpi_default_supported_interfaces[(acpi_size)i + 1];
154 	}
155 
156 	acpi_os_release_mutex(acpi_gbl_osi_mutex);
157 	return (AE_OK);
158 }
159 
160 /*******************************************************************************
161  *
162  * FUNCTION:    acpi_ut_interface_terminate
163  *
164  * PARAMETERS:  None
165  *
166  * RETURN:      Status
167  *
168  * DESCRIPTION: Delete all interfaces in the global list. Sets
169  *              acpi_gbl_supported_interfaces to NULL.
170  *
171  ******************************************************************************/
172 
acpi_ut_interface_terminate(void)173 acpi_status acpi_ut_interface_terminate(void)
174 {
175 	acpi_status status;
176 	struct acpi_interface_info *next_interface;
177 
178 	status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
179 	if (ACPI_FAILURE(status)) {
180 		return (status);
181 	}
182 
183 	next_interface = acpi_gbl_supported_interfaces;
184 	while (next_interface) {
185 		acpi_gbl_supported_interfaces = next_interface->next;
186 
187 		if (next_interface->flags & ACPI_OSI_DYNAMIC) {
188 
189 			/* Only interfaces added at runtime can be freed */
190 
191 			ACPI_FREE(next_interface->name);
192 			ACPI_FREE(next_interface);
193 		} else {
194 			/* Interface is in static list. Reset it to invalid or valid. */
195 
196 			if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {
197 				next_interface->flags |= ACPI_OSI_INVALID;
198 			} else {
199 				next_interface->flags &= ~ACPI_OSI_INVALID;
200 			}
201 		}
202 
203 		next_interface = acpi_gbl_supported_interfaces;
204 	}
205 
206 	acpi_os_release_mutex(acpi_gbl_osi_mutex);
207 	return (AE_OK);
208 }
209 
210 /*******************************************************************************
211  *
212  * FUNCTION:    acpi_ut_install_interface
213  *
214  * PARAMETERS:  interface_name      - The interface to install
215  *
216  * RETURN:      Status
217  *
218  * DESCRIPTION: Install the interface into the global interface list.
219  *              Caller MUST hold acpi_gbl_osi_mutex
220  *
221  ******************************************************************************/
222 
acpi_ut_install_interface(acpi_string interface_name)223 acpi_status acpi_ut_install_interface(acpi_string interface_name)
224 {
225 	struct acpi_interface_info *interface_info;
226 
227 	/* Allocate info block and space for the name string */
228 
229 	interface_info =
230 	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
231 	if (!interface_info) {
232 		return (AE_NO_MEMORY);
233 	}
234 
235 	interface_info->name = ACPI_ALLOCATE_ZEROED(strlen(interface_name) + 1);
236 	if (!interface_info->name) {
237 		ACPI_FREE(interface_info);
238 		return (AE_NO_MEMORY);
239 	}
240 
241 	/* Initialize new info and insert at the head of the global list */
242 
243 	strcpy(interface_info->name, interface_name);
244 	interface_info->flags = ACPI_OSI_DYNAMIC;
245 	interface_info->next = acpi_gbl_supported_interfaces;
246 
247 	acpi_gbl_supported_interfaces = interface_info;
248 	return (AE_OK);
249 }
250 
251 /*******************************************************************************
252  *
253  * FUNCTION:    acpi_ut_remove_interface
254  *
255  * PARAMETERS:  interface_name      - The interface to remove
256  *
257  * RETURN:      Status
258  *
259  * DESCRIPTION: Remove the interface from the global interface list.
260  *              Caller MUST hold acpi_gbl_osi_mutex
261  *
262  ******************************************************************************/
263 
acpi_ut_remove_interface(acpi_string interface_name)264 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
265 {
266 	struct acpi_interface_info *previous_interface;
267 	struct acpi_interface_info *next_interface;
268 
269 	previous_interface = next_interface = acpi_gbl_supported_interfaces;
270 	while (next_interface) {
271 		if (!strcmp(interface_name, next_interface->name)) {
272 			/*
273 			 * Found: name is in either the static list
274 			 * or was added at runtime
275 			 */
276 			if (next_interface->flags & ACPI_OSI_DYNAMIC) {
277 
278 				/* Interface was added dynamically, remove and free it */
279 
280 				if (previous_interface == next_interface) {
281 					acpi_gbl_supported_interfaces =
282 					    next_interface->next;
283 				} else {
284 					previous_interface->next =
285 					    next_interface->next;
286 				}
287 
288 				ACPI_FREE(next_interface->name);
289 				ACPI_FREE(next_interface);
290 			} else {
291 				/*
292 				 * Interface is in static list. If marked invalid, then
293 				 * it does not actually exist. Else, mark it invalid.
294 				 */
295 				if (next_interface->flags & ACPI_OSI_INVALID) {
296 					return (AE_NOT_EXIST);
297 				}
298 
299 				next_interface->flags |= ACPI_OSI_INVALID;
300 			}
301 
302 			return (AE_OK);
303 		}
304 
305 		previous_interface = next_interface;
306 		next_interface = next_interface->next;
307 	}
308 
309 	/* Interface was not found */
310 
311 	return (AE_NOT_EXIST);
312 }
313 
314 /*******************************************************************************
315  *
316  * FUNCTION:    acpi_ut_update_interfaces
317  *
318  * PARAMETERS:  action              - Actions to be performed during the
319  *                                    update
320  *
321  * RETURN:      Status
322  *
323  * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
324  *              strings or/and feature group strings.
325  *              Caller MUST hold acpi_gbl_osi_mutex
326  *
327  ******************************************************************************/
328 
acpi_ut_update_interfaces(u8 action)329 acpi_status acpi_ut_update_interfaces(u8 action)
330 {
331 	struct acpi_interface_info *next_interface;
332 
333 	next_interface = acpi_gbl_supported_interfaces;
334 	while (next_interface) {
335 		if (((next_interface->flags & ACPI_OSI_FEATURE) &&
336 		     (action & ACPI_FEATURE_STRINGS)) ||
337 		    (!(next_interface->flags & ACPI_OSI_FEATURE) &&
338 		     (action & ACPI_VENDOR_STRINGS))) {
339 			if (action & ACPI_DISABLE_INTERFACES) {
340 
341 				/* Mark the interfaces as invalid */
342 
343 				next_interface->flags |= ACPI_OSI_INVALID;
344 			} else {
345 				/* Mark the interfaces as valid */
346 
347 				next_interface->flags &= ~ACPI_OSI_INVALID;
348 			}
349 		}
350 
351 		next_interface = next_interface->next;
352 	}
353 
354 	return (AE_OK);
355 }
356 
357 /*******************************************************************************
358  *
359  * FUNCTION:    acpi_ut_get_interface
360  *
361  * PARAMETERS:  interface_name      - The interface to find
362  *
363  * RETURN:      struct acpi_interface_info if found. NULL if not found.
364  *
365  * DESCRIPTION: Search for the specified interface name in the global list.
366  *              Caller MUST hold acpi_gbl_osi_mutex
367  *
368  ******************************************************************************/
369 
acpi_ut_get_interface(acpi_string interface_name)370 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
371 {
372 	struct acpi_interface_info *next_interface;
373 
374 	next_interface = acpi_gbl_supported_interfaces;
375 	while (next_interface) {
376 		if (!strcmp(interface_name, next_interface->name)) {
377 			return (next_interface);
378 		}
379 
380 		next_interface = next_interface->next;
381 	}
382 
383 	return (NULL);
384 }
385 
386 /*******************************************************************************
387  *
388  * FUNCTION:    acpi_ut_osi_implementation
389  *
390  * PARAMETERS:  walk_state          - Current walk state
391  *
392  * RETURN:      Status
393  *              Integer: TRUE (0) if input string is matched
394  *                       FALSE (-1) if string is not matched
395  *
396  * DESCRIPTION: Implementation of the _OSI predefined control method. When
397  *              an invocation of _OSI is encountered in the system AML,
398  *              control is transferred to this function.
399  *
400  * (August 2016)
401  * Note:  _OSI is now defined to return "Ones" to indicate a match, for
402  * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones
403  * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF
404  * (ACPI_UINT64_MAX).
405  *
406  * This function always returns ACPI_UINT64_MAX for TRUE, and later code
407  * will truncate this to 32 bits if necessary.
408  *
409  ******************************************************************************/
410 
acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)411 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
412 {
413 	union acpi_operand_object *string_desc;
414 	union acpi_operand_object *return_desc;
415 	struct acpi_interface_info *interface_info;
416 	acpi_interface_handler interface_handler;
417 	acpi_status status;
418 	u64 return_value;
419 
420 	ACPI_FUNCTION_TRACE(ut_osi_implementation);
421 
422 	/* Validate the string input argument (from the AML caller) */
423 
424 	string_desc = walk_state->arguments[0].object;
425 	if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
426 		return_ACPI_STATUS(AE_TYPE);
427 	}
428 
429 	/* Create a return object */
430 
431 	return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
432 	if (!return_desc) {
433 		return_ACPI_STATUS(AE_NO_MEMORY);
434 	}
435 
436 	/* Default return value is 0, NOT SUPPORTED */
437 
438 	return_value = 0;
439 	status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
440 	if (ACPI_FAILURE(status)) {
441 		acpi_ut_remove_reference(return_desc);
442 		return_ACPI_STATUS(status);
443 	}
444 
445 	/* Lookup the interface in the global _OSI list */
446 
447 	interface_info = acpi_ut_get_interface(string_desc->string.pointer);
448 	if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
449 		/*
450 		 * The interface is supported.
451 		 * Update the osi_data if necessary. We keep track of the latest
452 		 * version of Windows that has been requested by the BIOS.
453 		 */
454 		if (interface_info->value > acpi_gbl_osi_data) {
455 			acpi_gbl_osi_data = interface_info->value;
456 		}
457 
458 		return_value = ACPI_UINT64_MAX;
459 	}
460 
461 	acpi_os_release_mutex(acpi_gbl_osi_mutex);
462 
463 	/*
464 	 * Invoke an optional _OSI interface handler. The host OS may wish
465 	 * to do some interface-specific handling. For example, warn about
466 	 * certain interfaces or override the true/false support value.
467 	 */
468 	interface_handler = acpi_gbl_interface_handler;
469 	if (interface_handler) {
470 		if (interface_handler
471 		    (string_desc->string.pointer, (u32)return_value)) {
472 			return_value = ACPI_UINT64_MAX;
473 		}
474 	}
475 
476 	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
477 			      "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
478 			      string_desc->string.pointer,
479 			      return_value == 0 ? "not " : ""));
480 
481 	/* Complete the return object */
482 
483 	return_desc->integer.value = return_value;
484 	walk_state->return_desc = return_desc;
485 	return_ACPI_STATUS(AE_OK);
486 }
487