summaryrefslogtreecommitdiff
path: root/drivers/acpi/tables/tbget.c
blob: 896f3ddda62ed9b1d7806aa11339b6912ab49da2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/******************************************************************************
 *
 * Module Name: tbget - ACPI Table get* routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */


#include <acpi/acpi.h>
#include <acpi/actables.h>


#define _COMPONENT          ACPI_TABLES
	 ACPI_MODULE_NAME    ("tbget")


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              table_info          - Where table info is returned
 *
 * RETURN:      None
 *
 * DESCRIPTION: Get entire table of unknown size.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table (
	struct acpi_pointer             *address,
	struct acpi_table_desc          *table_info)
{
	acpi_status                     status;
	struct acpi_table_header        header;


	ACPI_FUNCTION_TRACE ("tb_get_table");


	/*
	 * Get the header in order to get signature and table size
	 */
	status = acpi_tb_get_table_header (address, &header);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Get the entire table */

	status = acpi_tb_get_table_body (address, &header, table_info);
	if (ACPI_FAILURE (status)) {
		ACPI_REPORT_ERROR (("Could not get ACPI table (size %X), %s\n",
			header.length, acpi_format_exception (status)));
		return_ACPI_STATUS (status);
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_header
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              return_header       - Where the table header is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an ACPI table header.  Works in both physical or virtual
 *              addressing mode.  Works with both physical or logical pointers.
 *              Table is either copied or mapped, depending on the pointer
 *              type and mode of the processor.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table_header (
	struct acpi_pointer             *address,
	struct acpi_table_header        *return_header)
{
	acpi_status                     status = AE_OK;
	struct acpi_table_header        *header = NULL;


	ACPI_FUNCTION_TRACE ("tb_get_table_header");


	/*
	 * Flags contains the current processor mode (Virtual or Physical addressing)
	 * The pointer_type is either Logical or Physical
	 */
	switch (address->pointer_type) {
	case ACPI_PHYSMODE_PHYSPTR:
	case ACPI_LOGMODE_LOGPTR:

		/* Pointer matches processor mode, copy the header */

		ACPI_MEMCPY (return_header, address->pointer.logical, sizeof (struct acpi_table_header));
		break;


	case ACPI_LOGMODE_PHYSPTR:

		/* Create a logical address for the physical pointer*/

		status = acpi_os_map_memory (address->pointer.physical, sizeof (struct acpi_table_header),
				  (void *) &header);
		if (ACPI_FAILURE (status)) {
			ACPI_REPORT_ERROR (("Could not map memory at %8.8X%8.8X for length %X\n",
				ACPI_FORMAT_UINT64 (address->pointer.physical),
				sizeof (struct acpi_table_header)));
			return_ACPI_STATUS (status);
		}

		/* Copy header and delete mapping */

		ACPI_MEMCPY (return_header, header, sizeof (struct acpi_table_header));
		acpi_os_unmap_memory (header, sizeof (struct acpi_table_header));
		break;


	default:

		ACPI_REPORT_ERROR (("Invalid address flags %X\n",
			address->pointer_type));
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Table Signature: [%4.4s]\n",
		return_header->signature));

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_body
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              Header              - Header of the table to retrieve
 *              table_info          - Where the table info is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an entire ACPI table with support to allow the host OS to
 *              replace the table with a newer version (table override.)
 *              Works in both physical or virtual
 *              addressing mode.  Works with both physical or logical pointers.
 *              Table is either copied or mapped, depending on the pointer
 *              type and mode of the processor.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table_body (
	struct acpi_pointer             *address,
	struct acpi_table_header        *header,
	struct acpi_table_desc          *table_info)
{
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("tb_get_table_body");


	if (!table_info || !address) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/*
	 * Attempt table override.
	 */
	status = acpi_tb_table_override (header, table_info);
	if (ACPI_SUCCESS (status)) {
		/* Table was overridden by the host OS */

		return_ACPI_STATUS (status);
	}

	/* No override, get the original table */

	status = acpi_tb_get_this_table (address, header, table_info);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_table_override
 *
 * PARAMETERS:  Header              - Pointer to table header
 *              table_info          - Return info if table is overridden
 *
 * RETURN:      None
 *
 * DESCRIPTION: Attempts override of current table with a new one if provided
 *              by the host OS.
 *
 ******************************************************************************/

acpi_status
acpi_tb_table_override (
	struct acpi_table_header        *header,
	struct acpi_table_desc          *table_info)
{
	struct acpi_table_header        *new_table;
	acpi_status                     status;
	struct acpi_pointer             address;


	ACPI_FUNCTION_TRACE ("tb_table_override");


	/*
	 * The OSL will examine the header and decide whether to override this
	 * table.  If it decides to override, a table will be returned in new_table,
	 * which we will then copy.
	 */
	status = acpi_os_table_override (header, &new_table);
	if (ACPI_FAILURE (status)) {
		/* Some severe error from the OSL, but we basically ignore it */

		ACPI_REPORT_ERROR (("Could not override ACPI table, %s\n",
			acpi_format_exception (status)));
		return_ACPI_STATUS (status);
	}

	if (!new_table) {
		/* No table override */

		return_ACPI_STATUS (AE_NO_ACPI_TABLES);
	}

	/*
	 * We have a new table to override the old one.  Get a copy of
	 * the new one.  We know that the new table has a logical pointer.
	 */
	address.pointer_type    = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
	address.pointer.logical = new_table;

	status = acpi_tb_get_this_table (&address, new_table, table_info);
	if (ACPI_FAILURE (status)) {
		ACPI_REPORT_ERROR (("Could not copy override ACPI table, %s\n",
			acpi_format_exception (status)));
		return_ACPI_STATUS (status);
	}

	/* Copy the table info */

	ACPI_REPORT_INFO (("Table [%4.4s] replaced by host OS\n",
		table_info->pointer->signature));

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_this_table
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              Header              - Header of the table to retrieve
 *              table_info          - Where the table info is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an entire ACPI table.  Works in both physical or virtual
 *              addressing mode.  Works with both physical or logical pointers.
 *              Table is either copied or mapped, depending on the pointer
 *              type and mode of the processor.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_this_table (
	struct acpi_pointer             *address,
	struct acpi_table_header        *header,
	struct acpi_table_desc          *table_info)
{
	struct acpi_table_header        *full_table = NULL;
	u8                              allocation;
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE ("tb_get_this_table");


	/*
	 * Flags contains the current processor mode (Virtual or Physical addressing)
	 * The pointer_type is either Logical or Physical
	 */
	switch (address->pointer_type) {
	case ACPI_PHYSMODE_PHYSPTR:
	case ACPI_LOGMODE_LOGPTR:

		/* Pointer matches processor mode, copy the table to a new buffer */

		full_table = ACPI_MEM_ALLOCATE (header->length);
		if (!full_table) {
			ACPI_REPORT_ERROR (("Could not allocate table memory for [%4.4s] length %X\n",
				header->signature, header->length));
			return_ACPI_STATUS (AE_NO_MEMORY);
		}

		/* Copy the entire table (including header) to the local buffer */

		ACPI_MEMCPY (full_table, address->pointer.logical, header->length);

		/* Save allocation type */

		allocation = ACPI_MEM_ALLOCATED;
		break;


	case ACPI_LOGMODE_PHYSPTR:

		/*
		 * Just map the table's physical memory
		 * into our address space.
		 */
		status = acpi_os_map_memory (address->pointer.physical, (acpi_size) header->length,
				  (void *) &full_table);
		if (ACPI_FAILURE (status)) {
			ACPI_REPORT_ERROR (("Could not map memory for table [%4.4s] at %8.8X%8.8X for length %X\n",
				header->signature,
				ACPI_FORMAT_UINT64 (address->pointer.physical), header->length));
			return (status);
		}

		/* Save allocation type */

		allocation = ACPI_MEM_MAPPED;
		break;


	default:

		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid address flags %X\n",
			address->pointer_type));
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/*
	 * Validate checksum for _most_ tables,
	 * even the ones whose signature we don't recognize
	 */
	if (table_info->type != ACPI_TABLE_FACS) {
		status = acpi_tb_verify_table_checksum (full_table);

#if (!ACPI_CHECKSUM_ABORT)
		if (ACPI_FAILURE (status)) {
			/* Ignore the error if configuration says so */

			status = AE_OK;
		}
#endif
	}

	/* Return values */

	table_info->pointer     = full_table;
	table_info->length      = (acpi_size) header->length;
	table_info->allocation  = allocation;

	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
		"Found table [%4.4s] at %8.8X%8.8X, mapped/copied to %p\n",
		full_table->signature,
		ACPI_FORMAT_UINT64 (address->pointer.physical), full_table));

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_ptr
 *
 * PARAMETERS:  table_type      - one of the defined table types
 *              Instance        - Which table of this type
 *              table_ptr_loc   - pointer to location to place the pointer for
 *                                return
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the pointer to an ACPI table.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table_ptr (
	acpi_table_type                 table_type,
	u32                             instance,
	struct acpi_table_header        **table_ptr_loc)
{
	struct acpi_table_desc          *table_desc;
	u32                             i;


	ACPI_FUNCTION_TRACE ("tb_get_table_ptr");


	if (!acpi_gbl_DSDT) {
		return_ACPI_STATUS (AE_NO_ACPI_TABLES);
	}

	if (table_type > ACPI_TABLE_MAX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/*
	 * For all table types (Single/Multiple), the first
	 * instance is always in the list head.
	 */
	if (instance == 1) {
		/* Get the first */

		*table_ptr_loc = NULL;
		if (acpi_gbl_table_lists[table_type].next) {
			*table_ptr_loc = acpi_gbl_table_lists[table_type].next->pointer;
		}
		return_ACPI_STATUS (AE_OK);
	}

	/*
	 * Check for instance out of range
	 */
	if (instance > acpi_gbl_table_lists[table_type].count) {
		return_ACPI_STATUS (AE_NOT_EXIST);
	}

	/* Walk the list to get the desired table
	 * Since the if (Instance == 1) check above checked for the
	 * first table, setting table_desc equal to the .Next member
	 * is actually pointing to the second table.  Therefore, we
	 * need to walk from the 2nd table until we reach the Instance
	 * that the user is looking for and return its table pointer.
	 */
	table_desc = acpi_gbl_table_lists[table_type].next;
	for (i = 2; i < instance; i++) {
		table_desc = table_desc->next;
	}

	/* We are now pointing to the requested table's descriptor */

	*table_ptr_loc = table_desc->pointer;

	return_ACPI_STATUS (AE_OK);
}