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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
42f47869 | 3 | * Module Name: tbutils - ACPI Table utilities |
1da177e4 LT |
4 | * |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
fbb7a2dc | 8 | * Copyright (C) 2000 - 2014, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "actables.h" | |
1da177e4 | 47 | |
1da177e4 | 48 | #define _COMPONENT ACPI_TABLES |
4be44fcd | 49 | ACPI_MODULE_NAME("tbutils") |
1da177e4 | 50 | |
44f6c012 | 51 | /* Local prototypes */ |
671cc68d LZ |
52 | static acpi_status acpi_tb_validate_xsdt(acpi_physical_address address); |
53 | ||
a4bbb810 | 54 | static acpi_physical_address |
67a119f9 BM |
55 | acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size); |
56 | ||
33620c54 | 57 | #if (!ACPI_REDUCED_HARDWARE) |
009c4cbe BM |
58 | /******************************************************************************* |
59 | * | |
60 | * FUNCTION: acpi_tb_initialize_facs | |
61 | * | |
62 | * PARAMETERS: None | |
63 | * | |
64 | * RETURN: Status | |
65 | * | |
66 | * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global | |
67 | * for accessing the Global Lock and Firmware Waking Vector | |
68 | * | |
69 | ******************************************************************************/ | |
70 | ||
71 | acpi_status acpi_tb_initialize_facs(void) | |
72 | { | |
73 | acpi_status status; | |
74 | ||
22e5b40a BM |
75 | /* If Hardware Reduced flag is set, there is no FACS */ |
76 | ||
77 | if (acpi_gbl_reduced_hardware) { | |
78 | acpi_gbl_FACS = NULL; | |
79 | return (AE_OK); | |
80 | } | |
81 | ||
009c4cbe BM |
82 | status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, |
83 | ACPI_CAST_INDIRECT_PTR(struct | |
84 | acpi_table_header, | |
85 | &acpi_gbl_FACS)); | |
9c0d7939 | 86 | return (status); |
009c4cbe | 87 | } |
33620c54 | 88 | #endif /* !ACPI_REDUCED_HARDWARE */ |
009c4cbe | 89 | |
c857303a BM |
90 | /******************************************************************************* |
91 | * | |
92 | * FUNCTION: acpi_tb_tables_loaded | |
93 | * | |
94 | * PARAMETERS: None | |
95 | * | |
96 | * RETURN: TRUE if required ACPI tables are loaded | |
97 | * | |
98 | * DESCRIPTION: Determine if the minimum required ACPI tables are present | |
99 | * (FADT, FACS, DSDT) | |
100 | * | |
101 | ******************************************************************************/ | |
102 | ||
103 | u8 acpi_tb_tables_loaded(void) | |
104 | { | |
105 | ||
b9ee2043 | 106 | if (acpi_gbl_root_table_list.current_table_count >= 3) { |
c857303a BM |
107 | return (TRUE); |
108 | } | |
109 | ||
110 | return (FALSE); | |
111 | } | |
112 | ||
729df0f8 LM |
113 | /******************************************************************************* |
114 | * | |
115 | * FUNCTION: acpi_tb_check_dsdt_header | |
116 | * | |
117 | * PARAMETERS: None | |
118 | * | |
119 | * RETURN: None | |
120 | * | |
121 | * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect | |
122 | * if the DSDT has been replaced from outside the OS and/or if | |
123 | * the DSDT header has been corrupted. | |
124 | * | |
125 | ******************************************************************************/ | |
126 | ||
127 | void acpi_tb_check_dsdt_header(void) | |
128 | { | |
129 | ||
130 | /* Compare original length and checksum to current values */ | |
131 | ||
43323cb4 BM |
132 | if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length || |
133 | acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) { | |
3b3ea775 BM |
134 | ACPI_BIOS_ERROR((AE_INFO, |
135 | "The DSDT has been corrupted or replaced - " | |
136 | "old, new headers below")); | |
729df0f8 | 137 | acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header); |
43323cb4 | 138 | acpi_tb_print_table_header(0, acpi_gbl_DSDT); |
729df0f8 | 139 | |
aa2110cb LM |
140 | ACPI_ERROR((AE_INFO, |
141 | "Please send DMI info to linux-acpi@vger.kernel.org\n" | |
142 | "If system does not work as expected, please boot with acpi=copy_dsdt")); | |
143 | ||
729df0f8 LM |
144 | /* Disable further error messages */ |
145 | ||
43323cb4 | 146 | acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length; |
729df0f8 | 147 | acpi_gbl_original_dsdt_header.checksum = |
43323cb4 | 148 | acpi_gbl_DSDT->checksum; |
729df0f8 LM |
149 | } |
150 | } | |
151 | ||
69ec87ef LM |
152 | /******************************************************************************* |
153 | * | |
154 | * FUNCTION: acpi_tb_copy_dsdt | |
155 | * | |
156 | * PARAMETERS: table_desc - Installed table to copy | |
157 | * | |
158 | * RETURN: None | |
159 | * | |
160 | * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. | |
161 | * Some very bad BIOSs are known to either corrupt the DSDT or | |
162 | * install a new, bad DSDT. This copy works around the problem. | |
163 | * | |
164 | ******************************************************************************/ | |
165 | ||
43323cb4 | 166 | struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) |
69ec87ef LM |
167 | { |
168 | struct acpi_table_header *new_table; | |
43323cb4 BM |
169 | struct acpi_table_desc *table_desc; |
170 | ||
171 | table_desc = &acpi_gbl_root_table_list.tables[table_index]; | |
69ec87ef LM |
172 | |
173 | new_table = ACPI_ALLOCATE(table_desc->length); | |
174 | if (!new_table) { | |
175 | ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X", | |
176 | table_desc->length)); | |
43323cb4 | 177 | return (NULL); |
69ec87ef LM |
178 | } |
179 | ||
180 | ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length); | |
181 | acpi_tb_delete_table(table_desc); | |
dc156adf | 182 | table_desc->address = ACPI_PTR_TO_PHYSADDR(new_table); |
69ec87ef LM |
183 | table_desc->pointer = new_table; |
184 | table_desc->flags = ACPI_TABLE_ORIGIN_ALLOCATED; | |
185 | ||
186 | ACPI_INFO((AE_INFO, | |
187 | "Forced DSDT copy: length 0x%05X copied locally, original unmapped", | |
188 | new_table->length)); | |
43323cb4 BM |
189 | |
190 | return (new_table); | |
69ec87ef LM |
191 | } |
192 | ||
1da177e4 LT |
193 | /******************************************************************************* |
194 | * | |
c5fc42ac | 195 | * FUNCTION: acpi_tb_install_table |
1da177e4 | 196 | * |
ba494bee BM |
197 | * PARAMETERS: address - Physical address of DSDT or FACS |
198 | * signature - Table signature, NULL if no need to | |
c5fc42ac BM |
199 | * match |
200 | * table_index - Index into root table array | |
1da177e4 | 201 | * |
c5fc42ac | 202 | * RETURN: None |
1da177e4 | 203 | * |
ac5f98db | 204 | * DESCRIPTION: Install an ACPI table into the global data structure. The |
f7b004a1 | 205 | * table override mechanism is called to allow the host |
ac5f98db BM |
206 | * OS to replace any table before it is installed in the root |
207 | * table array. | |
1da177e4 LT |
208 | * |
209 | ******************************************************************************/ | |
210 | ||
765ec201 | 211 | void |
c5fc42ac | 212 | acpi_tb_install_table(acpi_physical_address address, |
97cbb7d1 | 213 | char *signature, u32 table_index) |
1da177e4 | 214 | { |
f7b004a1 BM |
215 | struct acpi_table_header *table; |
216 | struct acpi_table_header *final_table; | |
217 | struct acpi_table_desc *table_desc; | |
f3d2e786 | 218 | |
c5fc42ac BM |
219 | if (!address) { |
220 | ACPI_ERROR((AE_INFO, | |
221 | "Null physical address for ACPI table [%s]", | |
222 | signature)); | |
223 | return; | |
f3d2e786 BM |
224 | } |
225 | ||
c5fc42ac BM |
226 | /* Map just the table header */ |
227 | ||
f7b004a1 BM |
228 | table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); |
229 | if (!table) { | |
230 | ACPI_ERROR((AE_INFO, | |
231 | "Could not map memory for table [%s] at %p", | |
232 | signature, ACPI_CAST_PTR(void, address))); | |
c5fc42ac BM |
233 | return; |
234 | } | |
235 | ||
ac5f98db | 236 | /* If a particular signature is expected (DSDT/FACS), it must match */ |
c5fc42ac | 237 | |
f7b004a1 | 238 | if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) { |
3b3ea775 BM |
239 | ACPI_BIOS_ERROR((AE_INFO, |
240 | "Invalid signature 0x%X for ACPI table, expected [%s]", | |
241 | *ACPI_CAST_PTR(u32, table->signature), | |
242 | signature)); | |
c5fc42ac | 243 | goto unmap_and_exit; |
f3d2e786 BM |
244 | } |
245 | ||
f7b004a1 BM |
246 | /* |
247 | * Initialize the table entry. Set the pointer to NULL, since the | |
248 | * table is not fully mapped at this time. | |
249 | */ | |
250 | table_desc = &acpi_gbl_root_table_list.tables[table_index]; | |
251 | ||
252 | table_desc->address = address; | |
253 | table_desc->pointer = NULL; | |
254 | table_desc->length = table->length; | |
255 | table_desc->flags = ACPI_TABLE_ORIGIN_MAPPED; | |
256 | ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature); | |
257 | ||
ac5f98db BM |
258 | /* |
259 | * ACPI Table Override: | |
260 | * | |
261 | * Before we install the table, let the host OS override it with a new | |
262 | * one if desired. Any table within the RSDT/XSDT can be replaced, | |
263 | * including the DSDT which is pointed to by the FADT. | |
f7b004a1 BM |
264 | * |
265 | * NOTE: If the table is overridden, then final_table will contain a | |
266 | * mapped pointer to the full new table. If the table is not overridden, | |
267 | * or if there has been a physical override, then the table will be | |
268 | * fully mapped later (in verify table). In any case, we must | |
269 | * unmap the header that was mapped above. | |
ac5f98db | 270 | */ |
f7b004a1 BM |
271 | final_table = acpi_tb_table_override(table, table_desc); |
272 | if (!final_table) { | |
273 | final_table = table; /* There was no override */ | |
ac5f98db BM |
274 | } |
275 | ||
f7b004a1 | 276 | acpi_tb_print_table_header(table_desc->address, final_table); |
c5fc42ac | 277 | |
f7b004a1 | 278 | /* Set the global integer width (based upon revision of the DSDT) */ |
f3d2e786 | 279 | |
c5fc42ac | 280 | if (table_index == ACPI_TABLE_INDEX_DSDT) { |
f7b004a1 BM |
281 | acpi_ut_set_integer_width(final_table->revision); |
282 | } | |
f3d2e786 | 283 | |
f7b004a1 BM |
284 | /* |
285 | * If we have a physical override during this early loading of the ACPI | |
286 | * tables, unmap the table for now. It will be mapped again later when | |
287 | * it is actually used. This supports very early loading of ACPI tables, | |
288 | * before virtual memory is fully initialized and running within the | |
289 | * host OS. Note: A logical override has the ACPI_TABLE_ORIGIN_OVERRIDE | |
290 | * flag set and will not be deleted below. | |
291 | */ | |
292 | if (final_table != table) { | |
293 | acpi_tb_delete_table(table_desc); | |
c5fc42ac BM |
294 | } |
295 | ||
10622bf8 | 296 | unmap_and_exit: |
f7b004a1 BM |
297 | |
298 | /* Always unmap the table header that we mapped above */ | |
299 | ||
300 | acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); | |
c5fc42ac | 301 | } |
f3d2e786 | 302 | |
a4bbb810 BM |
303 | /******************************************************************************* |
304 | * | |
305 | * FUNCTION: acpi_tb_get_root_table_entry | |
306 | * | |
307 | * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry | |
308 | * table_entry_size - sizeof 32 or 64 (RSDT or XSDT) | |
309 | * | |
310 | * RETURN: Physical address extracted from the root table | |
311 | * | |
312 | * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on | |
313 | * both 32-bit and 64-bit platforms | |
314 | * | |
315 | * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on | |
316 | * 64-bit platforms. | |
317 | * | |
318 | ******************************************************************************/ | |
319 | ||
320 | static acpi_physical_address | |
67a119f9 | 321 | acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) |
a4bbb810 BM |
322 | { |
323 | u64 address64; | |
324 | ||
325 | /* | |
326 | * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): | |
327 | * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT | |
328 | */ | |
671cc68d | 329 | if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) { |
a4bbb810 BM |
330 | /* |
331 | * 32-bit platform, RSDT: Return 32-bit table entry | |
332 | * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return | |
333 | */ | |
334 | return ((acpi_physical_address) | |
335 | (*ACPI_CAST_PTR(u32, table_entry))); | |
336 | } else { | |
337 | /* | |
338 | * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return | |
ec41f193 BM |
339 | * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, |
340 | * return 64-bit | |
a4bbb810 BM |
341 | */ |
342 | ACPI_MOVE_64_TO_64(&address64, table_entry); | |
343 | ||
344 | #if ACPI_MACHINE_WIDTH == 32 | |
345 | if (address64 > ACPI_UINT32_MAX) { | |
346 | ||
ea5d8ebc | 347 | /* Will truncate 64-bit address to 32 bits, issue warning */ |
a4bbb810 | 348 | |
3b3ea775 BM |
349 | ACPI_BIOS_WARNING((AE_INFO, |
350 | "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," | |
351 | " truncating", | |
352 | ACPI_FORMAT_UINT64(address64))); | |
a4bbb810 BM |
353 | } |
354 | #endif | |
355 | return ((acpi_physical_address) (address64)); | |
356 | } | |
357 | } | |
358 | ||
671cc68d LZ |
359 | /******************************************************************************* |
360 | * | |
361 | * FUNCTION: acpi_tb_validate_xsdt | |
362 | * | |
363 | * PARAMETERS: address - Physical address of the XSDT (from RSDP) | |
364 | * | |
365 | * RETURN: Status. AE_OK if the table appears to be valid. | |
366 | * | |
367 | * DESCRIPTION: Validate an XSDT to ensure that it is of minimum size and does | |
368 | * not contain any NULL entries. A problem that is seen in the | |
369 | * field is that the XSDT exists, but is actually useless because | |
370 | * of one or more (or all) NULL entries. | |
371 | * | |
372 | ******************************************************************************/ | |
373 | ||
374 | static acpi_status acpi_tb_validate_xsdt(acpi_physical_address xsdt_address) | |
375 | { | |
376 | struct acpi_table_header *table; | |
377 | u8 *next_entry; | |
378 | acpi_physical_address address; | |
379 | u32 length; | |
380 | u32 entry_count; | |
381 | acpi_status status; | |
382 | u32 i; | |
383 | ||
384 | /* Get the XSDT length */ | |
385 | ||
386 | table = | |
387 | acpi_os_map_memory(xsdt_address, sizeof(struct acpi_table_header)); | |
388 | if (!table) { | |
389 | return (AE_NO_MEMORY); | |
390 | } | |
391 | ||
392 | length = table->length; | |
393 | acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); | |
394 | ||
395 | /* | |
396 | * Minimum XSDT length is the size of the standard ACPI header | |
397 | * plus one physical address entry | |
398 | */ | |
399 | if (length < (sizeof(struct acpi_table_header) + ACPI_XSDT_ENTRY_SIZE)) { | |
400 | return (AE_INVALID_TABLE_LENGTH); | |
401 | } | |
402 | ||
403 | /* Map the entire XSDT */ | |
404 | ||
405 | table = acpi_os_map_memory(xsdt_address, length); | |
406 | if (!table) { | |
407 | return (AE_NO_MEMORY); | |
408 | } | |
409 | ||
410 | /* Get the number of entries and pointer to first entry */ | |
411 | ||
412 | status = AE_OK; | |
413 | next_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header)); | |
414 | entry_count = (u32)((table->length - sizeof(struct acpi_table_header)) / | |
415 | ACPI_XSDT_ENTRY_SIZE); | |
416 | ||
417 | /* Validate each entry (physical address) within the XSDT */ | |
418 | ||
419 | for (i = 0; i < entry_count; i++) { | |
420 | address = | |
421 | acpi_tb_get_root_table_entry(next_entry, | |
422 | ACPI_XSDT_ENTRY_SIZE); | |
423 | if (!address) { | |
424 | ||
425 | /* Detected a NULL entry, XSDT is invalid */ | |
426 | ||
427 | status = AE_NULL_ENTRY; | |
428 | break; | |
429 | } | |
430 | ||
431 | next_entry += ACPI_XSDT_ENTRY_SIZE; | |
432 | } | |
433 | ||
434 | /* Unmap table */ | |
435 | ||
436 | acpi_os_unmap_memory(table, length); | |
437 | return (status); | |
438 | } | |
439 | ||
793c2388 BM |
440 | /******************************************************************************* |
441 | * | |
f3d2e786 | 442 | * FUNCTION: acpi_tb_parse_root_table |
793c2388 | 443 | * |
ba494bee | 444 | * PARAMETERS: rsdp - Pointer to the RSDP |
f3d2e786 BM |
445 | * |
446 | * RETURN: Status | |
793c2388 | 447 | * |
f3d2e786 BM |
448 | * DESCRIPTION: This function is called to parse the Root System Description |
449 | * Table (RSDT or XSDT) | |
793c2388 | 450 | * |
f3d2e786 BM |
451 | * NOTE: Tables are mapped (not copied) for efficiency. The FACS must |
452 | * be mapped and cannot be copied because it contains the actual | |
453 | * memory location of the ACPI Global Lock. | |
793c2388 BM |
454 | * |
455 | ******************************************************************************/ | |
456 | ||
45c9f78b | 457 | acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address) |
793c2388 | 458 | { |
c5fc42ac | 459 | struct acpi_table_rsdp *rsdp; |
67a119f9 BM |
460 | u32 table_entry_size; |
461 | u32 i; | |
c5fc42ac | 462 | u32 table_count; |
f3d2e786 BM |
463 | struct acpi_table_header *table; |
464 | acpi_physical_address address; | |
465 | u32 length; | |
466 | u8 *table_entry; | |
f3d2e786 BM |
467 | acpi_status status; |
468 | ||
469 | ACPI_FUNCTION_TRACE(tb_parse_root_table); | |
470 | ||
671cc68d LZ |
471 | /* Map the entire RSDP and extract the address of the RSDT or XSDT */ |
472 | ||
c5fc42ac BM |
473 | rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp)); |
474 | if (!rsdp) { | |
475 | return_ACPI_STATUS(AE_NO_MEMORY); | |
476 | } | |
477 | ||
478 | acpi_tb_print_table_header(rsdp_address, | |
479 | ACPI_CAST_PTR(struct acpi_table_header, | |
480 | rsdp)); | |
481 | ||
fab46105 | 482 | /* Use XSDT if present and not overridden. Otherwise, use RSDT */ |
f3d2e786 | 483 | |
fab46105 LZ |
484 | if ((rsdp->revision > 1) && |
485 | rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) { | |
f3d2e786 | 486 | /* |
671cc68d LZ |
487 | * RSDP contains an XSDT (64-bit physical addresses). We must use |
488 | * the XSDT if the revision is > 1 and the XSDT pointer is present, | |
489 | * as per the ACPI specification. | |
f3d2e786 | 490 | */ |
c5fc42ac | 491 | address = (acpi_physical_address) rsdp->xsdt_physical_address; |
671cc68d | 492 | table_entry_size = ACPI_XSDT_ENTRY_SIZE; |
f3d2e786 BM |
493 | } else { |
494 | /* Root table is an RSDT (32-bit physical addresses) */ | |
495 | ||
c5fc42ac | 496 | address = (acpi_physical_address) rsdp->rsdt_physical_address; |
671cc68d | 497 | table_entry_size = ACPI_RSDT_ENTRY_SIZE; |
f3d2e786 | 498 | } |
793c2388 | 499 | |
c5fc42ac BM |
500 | /* |
501 | * It is not possible to map more than one entry in some environments, | |
502 | * so unmap the RSDP here before mapping other tables | |
503 | */ | |
504 | acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); | |
505 | ||
671cc68d | 506 | /* |
fab46105 LZ |
507 | * If it is present and used, validate the XSDT for access/size |
508 | * and ensure that all table entries are at least non-NULL | |
671cc68d LZ |
509 | */ |
510 | if (table_entry_size == ACPI_XSDT_ENTRY_SIZE) { | |
511 | status = acpi_tb_validate_xsdt(address); | |
512 | if (ACPI_FAILURE(status)) { | |
513 | ACPI_BIOS_WARNING((AE_INFO, | |
514 | "XSDT is invalid (%s), using RSDT", | |
515 | acpi_format_exception(status))); | |
516 | ||
517 | /* Fall back to the RSDT */ | |
518 | ||
519 | address = | |
520 | (acpi_physical_address) rsdp->rsdt_physical_address; | |
521 | table_entry_size = ACPI_RSDT_ENTRY_SIZE; | |
9f3119b7 ZY |
522 | } |
523 | } | |
671cc68d | 524 | |
c5fc42ac | 525 | /* Map the RSDT/XSDT table header to get the full table length */ |
793c2388 | 526 | |
f3d2e786 BM |
527 | table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); |
528 | if (!table) { | |
c5fc42ac | 529 | return_ACPI_STATUS(AE_NO_MEMORY); |
f3d2e786 BM |
530 | } |
531 | ||
c5fc42ac BM |
532 | acpi_tb_print_table_header(address, table); |
533 | ||
671cc68d LZ |
534 | /* |
535 | * Validate length of the table, and map entire table. | |
536 | * Minimum length table must contain at least one entry. | |
537 | */ | |
f3d2e786 BM |
538 | length = table->length; |
539 | acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); | |
540 | ||
671cc68d | 541 | if (length < (sizeof(struct acpi_table_header) + table_entry_size)) { |
3b3ea775 BM |
542 | ACPI_BIOS_ERROR((AE_INFO, |
543 | "Invalid table length 0x%X in RSDT/XSDT", | |
544 | length)); | |
c5fc42ac | 545 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
f3d2e786 BM |
546 | } |
547 | ||
548 | table = acpi_os_map_memory(address, length); | |
549 | if (!table) { | |
c5fc42ac | 550 | return_ACPI_STATUS(AE_NO_MEMORY); |
f3d2e786 BM |
551 | } |
552 | ||
553 | /* Validate the root table checksum */ | |
554 | ||
c5fc42ac BM |
555 | status = acpi_tb_verify_checksum(table, length); |
556 | if (ACPI_FAILURE(status)) { | |
f3d2e786 | 557 | acpi_os_unmap_memory(table, length); |
c5fc42ac | 558 | return_ACPI_STATUS(status); |
f3d2e786 | 559 | } |
f3d2e786 | 560 | |
671cc68d | 561 | /* Get the number of entries and pointer to first entry */ |
f3d2e786 | 562 | |
ec41f193 BM |
563 | table_count = (u32)((table->length - sizeof(struct acpi_table_header)) / |
564 | table_entry_size); | |
671cc68d LZ |
565 | table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header)); |
566 | ||
c5fc42ac | 567 | /* |
ec41f193 BM |
568 | * First two entries in the table array are reserved for the DSDT |
569 | * and FACS, which are not actually present in the RSDT/XSDT - they | |
570 | * come from the FADT | |
c5fc42ac | 571 | */ |
b9ee2043 | 572 | acpi_gbl_root_table_list.current_table_count = 2; |
1da177e4 | 573 | |
671cc68d LZ |
574 | /* Initialize the root table array from the RSDT/XSDT */ |
575 | ||
c5fc42ac | 576 | for (i = 0; i < table_count; i++) { |
b9ee2043 BM |
577 | if (acpi_gbl_root_table_list.current_table_count >= |
578 | acpi_gbl_root_table_list.max_table_count) { | |
c5fc42ac BM |
579 | |
580 | /* There is no more room in the root table array, attempt resize */ | |
581 | ||
f3d2e786 BM |
582 | status = acpi_tb_resize_root_table_list(); |
583 | if (ACPI_FAILURE(status)) { | |
584 | ACPI_WARNING((AE_INFO, | |
585 | "Truncating %u table entries!", | |
5582982d LZ |
586 | (unsigned)(table_count - |
587 | (acpi_gbl_root_table_list. | |
b9ee2043 BM |
588 | current_table_count - |
589 | 2)))); | |
f3d2e786 BM |
590 | break; |
591 | } | |
592 | } | |
593 | ||
a4bbb810 BM |
594 | /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ |
595 | ||
b9ee2043 BM |
596 | acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list. |
597 | current_table_count].address = | |
a4bbb810 | 598 | acpi_tb_get_root_table_entry(table_entry, table_entry_size); |
f3d2e786 | 599 | |
c5fc42ac | 600 | table_entry += table_entry_size; |
b9ee2043 | 601 | acpi_gbl_root_table_list.current_table_count++; |
1da177e4 | 602 | } |
793c2388 | 603 | |
f3d2e786 BM |
604 | /* |
605 | * It is not possible to map more than one entry in some environments, | |
606 | * so unmap the root table here before mapping other tables | |
607 | */ | |
608 | acpi_os_unmap_memory(table, length); | |
609 | ||
c5fc42ac BM |
610 | /* |
611 | * Complete the initialization of the root table array by examining | |
612 | * the header of each table | |
613 | */ | |
b9ee2043 | 614 | for (i = 2; i < acpi_gbl_root_table_list.current_table_count; i++) { |
c5fc42ac | 615 | acpi_tb_install_table(acpi_gbl_root_table_list.tables[i]. |
97cbb7d1 | 616 | address, NULL, i); |
f3d2e786 | 617 | |
671cc68d | 618 | /* Special case for FADT - validate it then get the DSDT and FACS */ |
f3d2e786 | 619 | |
c5fc42ac BM |
620 | if (ACPI_COMPARE_NAME |
621 | (&acpi_gbl_root_table_list.tables[i].signature, | |
622 | ACPI_SIG_FADT)) { | |
97cbb7d1 | 623 | acpi_tb_parse_fadt(i); |
f3d2e786 BM |
624 | } |
625 | } | |
626 | ||
627 | return_ACPI_STATUS(AE_OK); | |
1da177e4 | 628 | } |