summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/tbutils.c
blob: 4337990127cc39930b50983d7e7eff05966fcfb6 (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
/******************************************************************************
 *
 * Module Name: tbutils - ACPI Table utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2015, Intel Corp.
 * 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 "accommon.h"
#include "actables.h"

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbutils")

/* Local prototypes */
static acpi_physical_address
acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);

#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_initialize_facs
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
 *              for accessing the Global Lock and Firmware Waking Vector
 *
 ******************************************************************************/

acpi_status acpi_tb_initialize_facs(void)
{
	struct acpi_table_facs *facs;

	/* If Hardware Reduced flag is set, there is no FACS */

	if (acpi_gbl_reduced_hardware) {
		acpi_gbl_FACS = NULL;
		return (AE_OK);
	} else if (acpi_gbl_FADT.Xfacs &&
		   (!acpi_gbl_FADT.facs
		    || !acpi_gbl_use32_bit_facs_addresses)) {
		(void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
					      ACPI_CAST_INDIRECT_PTR(struct
								     acpi_table_header,
								     &facs));
		acpi_gbl_FACS = facs;
	} else if (acpi_gbl_FADT.facs) {
		(void)acpi_get_table_by_index(acpi_gbl_facs_index,
					      ACPI_CAST_INDIRECT_PTR(struct
								     acpi_table_header,
								     &facs));
		acpi_gbl_FACS = facs;
	}

	/* If there is no FACS, just continue. There was already an error msg */

	return (AE_OK);
}
#endif				/* !ACPI_REDUCED_HARDWARE */

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_tables_loaded
 *
 * PARAMETERS:  None
 *
 * RETURN:      TRUE if required ACPI tables are loaded
 *
 * DESCRIPTION: Determine if the minimum required ACPI tables are present
 *              (FADT, FACS, DSDT)
 *
 ******************************************************************************/

u8 acpi_tb_tables_loaded(void)
{

	if (acpi_gbl_root_table_list.current_table_count >= 4) {
		return (TRUE);
	}

	return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_check_dsdt_header
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
 *              if the DSDT has been replaced from outside the OS and/or if
 *              the DSDT header has been corrupted.
 *
 ******************************************************************************/

void acpi_tb_check_dsdt_header(void)
{

	/* Compare original length and checksum to current values */

	if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
	    acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
		ACPI_BIOS_ERROR((AE_INFO,
				 "The DSDT has been corrupted or replaced - "
				 "old, new headers below"));
		acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
		acpi_tb_print_table_header(0, acpi_gbl_DSDT);

		ACPI_ERROR((AE_INFO,
			    "Please send DMI info to linux-acpi@vger.kernel.org\n"
			    "If system does not work as expected, please boot with acpi=copy_dsdt"));

		/* Disable further error messages */

		acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
		acpi_gbl_original_dsdt_header.checksum =
		    acpi_gbl_DSDT->checksum;
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_copy_dsdt
 *
 * PARAMETERS:  table_desc          - Installed table to copy
 *
 * RETURN:      None
 *
 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
 *              Some very bad BIOSs are known to either corrupt the DSDT or
 *              install a new, bad DSDT. This copy works around the problem.
 *
 ******************************************************************************/

struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
{
	struct acpi_table_header *new_table;
	struct acpi_table_desc *table_desc;

	table_desc = &acpi_gbl_root_table_list.tables[table_index];

	new_table = ACPI_ALLOCATE(table_desc->length);
	if (!new_table) {
		ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
			    table_desc->length));
		return (NULL);
	}

	memcpy(new_table, table_desc->pointer, table_desc->length);
	acpi_tb_uninstall_table(table_desc);

	acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
				      tables[acpi_gbl_dsdt_index],
				      ACPI_PTR_TO_PHYSADDR(new_table),
				      ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
				      new_table);

	ACPI_INFO((AE_INFO,
		   "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
		   new_table->length));

	return (new_table);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_root_table_entry
 *
 * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
 *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
 *
 * RETURN:      Physical address extracted from the root table
 *
 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
 *              both 32-bit and 64-bit platforms
 *
 * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
 *              64-bit platforms.
 *
 ******************************************************************************/

static acpi_physical_address
acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
{
	u64 address64;

	/*
	 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
	 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
	 */
	if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
		/*
		 * 32-bit platform, RSDT: Return 32-bit table entry
		 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
		 */
		return ((acpi_physical_address)
			(*ACPI_CAST_PTR(u32, table_entry)));
	} else {
		/*
		 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
		 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
		 *  return 64-bit
		 */
		ACPI_MOVE_64_TO_64(&address64, table_entry);

#if ACPI_MACHINE_WIDTH == 32
		if (address64 > ACPI_UINT32_MAX) {

			/* Will truncate 64-bit address to 32 bits, issue warning */

			ACPI_BIOS_WARNING((AE_INFO,
					   "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
					   " truncating",
					   ACPI_FORMAT_UINT64(address64)));
		}
#endif
		return ((acpi_physical_address) (address64));
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_parse_root_table
 *
 * PARAMETERS:  rsdp                    - Pointer to the RSDP
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to parse the Root System Description
 *              Table (RSDT or XSDT)
 *
 * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
 *              be mapped and cannot be copied because it contains the actual
 *              memory location of the ACPI Global Lock.
 *
 ******************************************************************************/

acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
{
	struct acpi_table_rsdp *rsdp;
	u32 table_entry_size;
	u32 i;
	u32 table_count;
	struct acpi_table_header *table;
	acpi_physical_address address;
	u32 length;
	u8 *table_entry;
	acpi_status status;
	u32 table_index;

	ACPI_FUNCTION_TRACE(tb_parse_root_table);

	/* Map the entire RSDP and extract the address of the RSDT or XSDT */

	rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
	if (!rsdp) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	acpi_tb_print_table_header(rsdp_address,
				   ACPI_CAST_PTR(struct acpi_table_header,
						 rsdp));

	/* Use XSDT if present and not overridden. Otherwise, use RSDT */

	if ((rsdp->revision > 1) &&
	    rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
		/*
		 * RSDP contains an XSDT (64-bit physical addresses). We must use
		 * the XSDT if the revision is > 1 and the XSDT pointer is present,
		 * as per the ACPI specification.
		 */
		address = (acpi_physical_address) rsdp->xsdt_physical_address;
		table_entry_size = ACPI_XSDT_ENTRY_SIZE;
	} else {
		/* Root table is an RSDT (32-bit physical addresses) */

		address = (acpi_physical_address) rsdp->rsdt_physical_address;
		table_entry_size = ACPI_RSDT_ENTRY_SIZE;
	}

	/*
	 * It is not possible to map more than one entry in some environments,
	 * so unmap the RSDP here before mapping other tables
	 */
	acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));

	/* Map the RSDT/XSDT table header to get the full table length */

	table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
	if (!table) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	acpi_tb_print_table_header(address, table);

	/*
	 * Validate length of the table, and map entire table.
	 * Minimum length table must contain at least one entry.
	 */
	length = table->length;
	acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));

	if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
		ACPI_BIOS_ERROR((AE_INFO,
				 "Invalid table length 0x%X in RSDT/XSDT",
				 length));
		return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
	}

	table = acpi_os_map_memory(address, length);
	if (!table) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Validate the root table checksum */

	status = acpi_tb_verify_checksum(table, length);
	if (ACPI_FAILURE(status)) {
		acpi_os_unmap_memory(table, length);
		return_ACPI_STATUS(status);
	}

	/* Get the number of entries and pointer to first entry */

	table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
			    table_entry_size);
	table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));

	/* Initialize the root table array from the RSDT/XSDT */

	for (i = 0; i < table_count; i++) {

		/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */

		address =
		    acpi_tb_get_root_table_entry(table_entry, table_entry_size);

		/* Skip NULL entries in RSDT/XSDT */

		if (!address) {
			goto next_table;
		}

		status = acpi_tb_install_standard_table(address,
							ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
							FALSE, TRUE,
							&table_index);

		if (ACPI_SUCCESS(status) &&
		    ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
				      tables[table_index].signature,
				      ACPI_SIG_FADT)) {
			acpi_tb_parse_fadt(table_index);
		}

next_table:

		table_entry += table_entry_size;
	}

	acpi_os_unmap_memory(table, length);

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_is_valid_signature
 *
 * PARAMETERS:  signature           - Sig string to be validated
 *
 * RETURN:      TRUE if signature is correct length and has valid characters
 *
 * DESCRIPTION: Validate an ACPI table signature.
 *
 ******************************************************************************/

u8 acpi_is_valid_signature(char *signature)
{
	u32 i;

	/* Validate the signature length */

	if (strlen(signature) != ACPI_NAME_SIZE) {
		return (FALSE);
	}

	/* Validate each character in the signature */

	for (i = 0; i < ACPI_NAME_SIZE; i++) {
		if (!acpi_ut_valid_acpi_char(signature[i], i)) {
			return (FALSE);
		}
	}

	return (TRUE);
}