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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 */ |
a4bbb810 | 52 | static acpi_physical_address |
67a119f9 BM |
53 | acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size); |
54 | ||
33620c54 | 55 | #if (!ACPI_REDUCED_HARDWARE) |
009c4cbe BM |
56 | /******************************************************************************* |
57 | * | |
58 | * FUNCTION: acpi_tb_initialize_facs | |
59 | * | |
60 | * PARAMETERS: None | |
61 | * | |
62 | * RETURN: Status | |
63 | * | |
64 | * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global | |
65 | * for accessing the Global Lock and Firmware Waking Vector | |
66 | * | |
67 | ******************************************************************************/ | |
68 | ||
69 | acpi_status acpi_tb_initialize_facs(void) | |
70 | { | |
71 | acpi_status status; | |
72 | ||
22e5b40a BM |
73 | /* If Hardware Reduced flag is set, there is no FACS */ |
74 | ||
75 | if (acpi_gbl_reduced_hardware) { | |
76 | acpi_gbl_FACS = NULL; | |
77 | return (AE_OK); | |
78 | } | |
79 | ||
009c4cbe BM |
80 | status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, |
81 | ACPI_CAST_INDIRECT_PTR(struct | |
82 | acpi_table_header, | |
83 | &acpi_gbl_FACS)); | |
9c0d7939 | 84 | return (status); |
009c4cbe | 85 | } |
33620c54 | 86 | #endif /* !ACPI_REDUCED_HARDWARE */ |
009c4cbe | 87 | |
c857303a BM |
88 | /******************************************************************************* |
89 | * | |
90 | * FUNCTION: acpi_tb_tables_loaded | |
91 | * | |
92 | * PARAMETERS: None | |
93 | * | |
94 | * RETURN: TRUE if required ACPI tables are loaded | |
95 | * | |
96 | * DESCRIPTION: Determine if the minimum required ACPI tables are present | |
97 | * (FADT, FACS, DSDT) | |
98 | * | |
99 | ******************************************************************************/ | |
100 | ||
101 | u8 acpi_tb_tables_loaded(void) | |
102 | { | |
103 | ||
b9ee2043 | 104 | if (acpi_gbl_root_table_list.current_table_count >= 3) { |
c857303a BM |
105 | return (TRUE); |
106 | } | |
107 | ||
108 | return (FALSE); | |
109 | } | |
110 | ||
729df0f8 LM |
111 | /******************************************************************************* |
112 | * | |
113 | * FUNCTION: acpi_tb_check_dsdt_header | |
114 | * | |
115 | * PARAMETERS: None | |
116 | * | |
117 | * RETURN: None | |
118 | * | |
119 | * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect | |
120 | * if the DSDT has been replaced from outside the OS and/or if | |
121 | * the DSDT header has been corrupted. | |
122 | * | |
123 | ******************************************************************************/ | |
124 | ||
125 | void acpi_tb_check_dsdt_header(void) | |
126 | { | |
127 | ||
128 | /* Compare original length and checksum to current values */ | |
129 | ||
43323cb4 BM |
130 | if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length || |
131 | acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) { | |
3b3ea775 BM |
132 | ACPI_BIOS_ERROR((AE_INFO, |
133 | "The DSDT has been corrupted or replaced - " | |
134 | "old, new headers below")); | |
729df0f8 | 135 | acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header); |
43323cb4 | 136 | acpi_tb_print_table_header(0, acpi_gbl_DSDT); |
729df0f8 | 137 | |
aa2110cb LM |
138 | ACPI_ERROR((AE_INFO, |
139 | "Please send DMI info to linux-acpi@vger.kernel.org\n" | |
140 | "If system does not work as expected, please boot with acpi=copy_dsdt")); | |
141 | ||
729df0f8 LM |
142 | /* Disable further error messages */ |
143 | ||
43323cb4 | 144 | acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length; |
729df0f8 | 145 | acpi_gbl_original_dsdt_header.checksum = |
43323cb4 | 146 | acpi_gbl_DSDT->checksum; |
729df0f8 LM |
147 | } |
148 | } | |
149 | ||
69ec87ef LM |
150 | /******************************************************************************* |
151 | * | |
152 | * FUNCTION: acpi_tb_copy_dsdt | |
153 | * | |
154 | * PARAMETERS: table_desc - Installed table to copy | |
155 | * | |
156 | * RETURN: None | |
157 | * | |
158 | * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. | |
159 | * Some very bad BIOSs are known to either corrupt the DSDT or | |
160 | * install a new, bad DSDT. This copy works around the problem. | |
161 | * | |
162 | ******************************************************************************/ | |
163 | ||
43323cb4 | 164 | struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) |
69ec87ef LM |
165 | { |
166 | struct acpi_table_header *new_table; | |
43323cb4 BM |
167 | struct acpi_table_desc *table_desc; |
168 | ||
169 | table_desc = &acpi_gbl_root_table_list.tables[table_index]; | |
69ec87ef LM |
170 | |
171 | new_table = ACPI_ALLOCATE(table_desc->length); | |
172 | if (!new_table) { | |
173 | ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X", | |
174 | table_desc->length)); | |
43323cb4 | 175 | return (NULL); |
69ec87ef LM |
176 | } |
177 | ||
178 | ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length); | |
7f9fc99c | 179 | acpi_tb_uninstall_table(table_desc); |
ed6f1d44 BM |
180 | |
181 | acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list. | |
182 | tables[ACPI_TABLE_INDEX_DSDT], | |
183 | ACPI_PTR_TO_PHYSADDR(new_table), | |
184 | ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, | |
185 | new_table); | |
69ec87ef LM |
186 | |
187 | ACPI_INFO((AE_INFO, | |
188 | "Forced DSDT copy: length 0x%05X copied locally, original unmapped", | |
189 | new_table->length)); | |
43323cb4 BM |
190 | |
191 | return (new_table); | |
69ec87ef LM |
192 | } |
193 | ||
a4bbb810 BM |
194 | /******************************************************************************* |
195 | * | |
196 | * FUNCTION: acpi_tb_get_root_table_entry | |
197 | * | |
198 | * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry | |
199 | * table_entry_size - sizeof 32 or 64 (RSDT or XSDT) | |
200 | * | |
201 | * RETURN: Physical address extracted from the root table | |
202 | * | |
203 | * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on | |
204 | * both 32-bit and 64-bit platforms | |
205 | * | |
206 | * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on | |
207 | * 64-bit platforms. | |
208 | * | |
209 | ******************************************************************************/ | |
210 | ||
211 | static acpi_physical_address | |
67a119f9 | 212 | acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) |
a4bbb810 BM |
213 | { |
214 | u64 address64; | |
215 | ||
216 | /* | |
217 | * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): | |
218 | * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT | |
219 | */ | |
671cc68d | 220 | if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) { |
a4bbb810 BM |
221 | /* |
222 | * 32-bit platform, RSDT: Return 32-bit table entry | |
223 | * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return | |
224 | */ | |
225 | return ((acpi_physical_address) | |
226 | (*ACPI_CAST_PTR(u32, table_entry))); | |
227 | } else { | |
228 | /* | |
229 | * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return | |
ec41f193 BM |
230 | * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, |
231 | * return 64-bit | |
a4bbb810 BM |
232 | */ |
233 | ACPI_MOVE_64_TO_64(&address64, table_entry); | |
234 | ||
235 | #if ACPI_MACHINE_WIDTH == 32 | |
236 | if (address64 > ACPI_UINT32_MAX) { | |
237 | ||
ea5d8ebc | 238 | /* Will truncate 64-bit address to 32 bits, issue warning */ |
a4bbb810 | 239 | |
3b3ea775 BM |
240 | ACPI_BIOS_WARNING((AE_INFO, |
241 | "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," | |
242 | " truncating", | |
243 | ACPI_FORMAT_UINT64(address64))); | |
a4bbb810 BM |
244 | } |
245 | #endif | |
246 | return ((acpi_physical_address) (address64)); | |
247 | } | |
248 | } | |
249 | ||
793c2388 BM |
250 | /******************************************************************************* |
251 | * | |
f3d2e786 | 252 | * FUNCTION: acpi_tb_parse_root_table |
793c2388 | 253 | * |
ba494bee | 254 | * PARAMETERS: rsdp - Pointer to the RSDP |
f3d2e786 BM |
255 | * |
256 | * RETURN: Status | |
793c2388 | 257 | * |
f3d2e786 BM |
258 | * DESCRIPTION: This function is called to parse the Root System Description |
259 | * Table (RSDT or XSDT) | |
793c2388 | 260 | * |
f3d2e786 BM |
261 | * NOTE: Tables are mapped (not copied) for efficiency. The FACS must |
262 | * be mapped and cannot be copied because it contains the actual | |
263 | * memory location of the ACPI Global Lock. | |
793c2388 BM |
264 | * |
265 | ******************************************************************************/ | |
266 | ||
45c9f78b | 267 | acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address) |
793c2388 | 268 | { |
c5fc42ac | 269 | struct acpi_table_rsdp *rsdp; |
67a119f9 BM |
270 | u32 table_entry_size; |
271 | u32 i; | |
c5fc42ac | 272 | u32 table_count; |
f3d2e786 BM |
273 | struct acpi_table_header *table; |
274 | acpi_physical_address address; | |
275 | u32 length; | |
276 | u8 *table_entry; | |
f3d2e786 | 277 | acpi_status status; |
86dfc6f3 | 278 | u32 table_index; |
f3d2e786 BM |
279 | |
280 | ACPI_FUNCTION_TRACE(tb_parse_root_table); | |
281 | ||
671cc68d LZ |
282 | /* Map the entire RSDP and extract the address of the RSDT or XSDT */ |
283 | ||
c5fc42ac BM |
284 | rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp)); |
285 | if (!rsdp) { | |
286 | return_ACPI_STATUS(AE_NO_MEMORY); | |
287 | } | |
288 | ||
289 | acpi_tb_print_table_header(rsdp_address, | |
290 | ACPI_CAST_PTR(struct acpi_table_header, | |
291 | rsdp)); | |
292 | ||
fab46105 | 293 | /* Use XSDT if present and not overridden. Otherwise, use RSDT */ |
f3d2e786 | 294 | |
fab46105 LZ |
295 | if ((rsdp->revision > 1) && |
296 | rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) { | |
f3d2e786 | 297 | /* |
671cc68d LZ |
298 | * RSDP contains an XSDT (64-bit physical addresses). We must use |
299 | * the XSDT if the revision is > 1 and the XSDT pointer is present, | |
300 | * as per the ACPI specification. | |
f3d2e786 | 301 | */ |
c5fc42ac | 302 | address = (acpi_physical_address) rsdp->xsdt_physical_address; |
671cc68d | 303 | table_entry_size = ACPI_XSDT_ENTRY_SIZE; |
f3d2e786 BM |
304 | } else { |
305 | /* Root table is an RSDT (32-bit physical addresses) */ | |
306 | ||
c5fc42ac | 307 | address = (acpi_physical_address) rsdp->rsdt_physical_address; |
671cc68d | 308 | table_entry_size = ACPI_RSDT_ENTRY_SIZE; |
f3d2e786 | 309 | } |
793c2388 | 310 | |
c5fc42ac BM |
311 | /* |
312 | * It is not possible to map more than one entry in some environments, | |
313 | * so unmap the RSDP here before mapping other tables | |
314 | */ | |
315 | acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); | |
316 | ||
317 | /* Map the RSDT/XSDT table header to get the full table length */ | |
793c2388 | 318 | |
f3d2e786 BM |
319 | table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); |
320 | if (!table) { | |
c5fc42ac | 321 | return_ACPI_STATUS(AE_NO_MEMORY); |
f3d2e786 BM |
322 | } |
323 | ||
c5fc42ac BM |
324 | acpi_tb_print_table_header(address, table); |
325 | ||
671cc68d LZ |
326 | /* |
327 | * Validate length of the table, and map entire table. | |
328 | * Minimum length table must contain at least one entry. | |
329 | */ | |
f3d2e786 BM |
330 | length = table->length; |
331 | acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); | |
332 | ||
671cc68d | 333 | if (length < (sizeof(struct acpi_table_header) + table_entry_size)) { |
3b3ea775 BM |
334 | ACPI_BIOS_ERROR((AE_INFO, |
335 | "Invalid table length 0x%X in RSDT/XSDT", | |
336 | length)); | |
c5fc42ac | 337 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
f3d2e786 BM |
338 | } |
339 | ||
340 | table = acpi_os_map_memory(address, length); | |
341 | if (!table) { | |
c5fc42ac | 342 | return_ACPI_STATUS(AE_NO_MEMORY); |
f3d2e786 BM |
343 | } |
344 | ||
345 | /* Validate the root table checksum */ | |
346 | ||
c5fc42ac BM |
347 | status = acpi_tb_verify_checksum(table, length); |
348 | if (ACPI_FAILURE(status)) { | |
f3d2e786 | 349 | acpi_os_unmap_memory(table, length); |
c5fc42ac | 350 | return_ACPI_STATUS(status); |
f3d2e786 | 351 | } |
f3d2e786 | 352 | |
671cc68d | 353 | /* Get the number of entries and pointer to first entry */ |
f3d2e786 | 354 | |
ec41f193 BM |
355 | table_count = (u32)((table->length - sizeof(struct acpi_table_header)) / |
356 | table_entry_size); | |
671cc68d LZ |
357 | table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header)); |
358 | ||
c5fc42ac | 359 | /* |
ec41f193 BM |
360 | * First two entries in the table array are reserved for the DSDT |
361 | * and FACS, which are not actually present in the RSDT/XSDT - they | |
362 | * come from the FADT | |
c5fc42ac | 363 | */ |
b9ee2043 | 364 | acpi_gbl_root_table_list.current_table_count = 2; |
1da177e4 | 365 | |
671cc68d LZ |
366 | /* Initialize the root table array from the RSDT/XSDT */ |
367 | ||
c5fc42ac | 368 | for (i = 0; i < table_count; i++) { |
f3d2e786 | 369 | |
a4bbb810 BM |
370 | /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ |
371 | ||
0f929fbf LZ |
372 | address = |
373 | acpi_tb_get_root_table_entry(table_entry, table_entry_size); | |
374 | ||
375 | /* Skip NULL entries in RSDT/XSDT */ | |
376 | ||
377 | if (!address) { | |
378 | goto next_table; | |
379 | } | |
380 | ||
381 | status = acpi_tb_install_standard_table(address, | |
382 | ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, | |
383 | FALSE, TRUE, | |
384 | &table_index); | |
86dfc6f3 LZ |
385 | |
386 | if (ACPI_SUCCESS(status) && | |
387 | ACPI_COMPARE_NAME(&acpi_gbl_root_table_list. | |
388 | tables[table_index].signature, | |
389 | ACPI_SIG_FADT)) { | |
390 | acpi_tb_parse_fadt(table_index); | |
391 | } | |
f3d2e786 | 392 | |
0f929fbf LZ |
393 | next_table: |
394 | ||
c5fc42ac | 395 | table_entry += table_entry_size; |
1da177e4 | 396 | } |
793c2388 | 397 | |
f3d2e786 BM |
398 | acpi_os_unmap_memory(table, length); |
399 | ||
f3d2e786 | 400 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 401 | } |