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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
f3d2e786 | 3 | * Module Name: tbutils - table utilities |
1da177e4 LT |
4 | * |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
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 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/actables.h> | |
46 | ||
1da177e4 | 47 | #define _COMPONENT ACPI_TABLES |
4be44fcd | 48 | ACPI_MODULE_NAME("tbutils") |
1da177e4 | 49 | |
44f6c012 | 50 | /* Local prototypes */ |
a4bbb810 BM |
51 | static acpi_physical_address |
52 | acpi_tb_get_root_table_entry(u8 * table_entry, | |
53 | acpi_native_uint table_entry_size); | |
54 | ||
0c9938cc RM |
55 | /******************************************************************************* |
56 | * | |
f3d2e786 | 57 | * FUNCTION: acpi_tb_print_table_header |
0c9938cc | 58 | * |
f3d2e786 BM |
59 | * PARAMETERS: Address - Table physical address |
60 | * Header - Table header | |
0c9938cc | 61 | * |
f3d2e786 | 62 | * RETURN: None |
0c9938cc | 63 | * |
c5fc42ac | 64 | * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP. |
0c9938cc RM |
65 | * |
66 | ******************************************************************************/ | |
67 | ||
f3d2e786 BM |
68 | void |
69 | acpi_tb_print_table_header(acpi_physical_address address, | |
70 | struct acpi_table_header *header) | |
0c9938cc | 71 | { |
0c9938cc | 72 | |
c5fc42ac BM |
73 | if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) { |
74 | ||
75 | /* FACS only has signature and length fields of common table header */ | |
76 | ||
77 | ACPI_INFO((AE_INFO, "%4.4s @ 0x%p/0x%04X", | |
78 | header->signature, ACPI_CAST_PTR(void, address), | |
79 | header->length)); | |
80 | } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) { | |
81 | ||
82 | /* RSDP has no common fields */ | |
83 | ||
84 | ACPI_INFO((AE_INFO, "RSDP @ 0x%p/0x%04X (v%3.3d %6.6s)", | |
85 | ACPI_CAST_PTR(void, address), | |
a4bbb810 BM |
86 | (ACPI_CAST_PTR(struct acpi_table_rsdp, header)-> |
87 | revision > | |
88 | 0) ? ACPI_CAST_PTR(struct acpi_table_rsdp, | |
89 | header)->length : 20, | |
90 | ACPI_CAST_PTR(struct acpi_table_rsdp, | |
91 | header)->revision, | |
92 | ACPI_CAST_PTR(struct acpi_table_rsdp, | |
93 | header)->oem_id)); | |
c5fc42ac | 94 | } else { |
4bf27393 BM |
95 | /* Standard ACPI table with full common header */ |
96 | ||
c5fc42ac BM |
97 | ACPI_INFO((AE_INFO, |
98 | "%4.4s @ 0x%p/0x%04X (v%3.3d %6.6s %8.8s 0x%08X %4.4s 0x%08X)", | |
99 | header->signature, ACPI_CAST_PTR(void, address), | |
100 | header->length, header->revision, header->oem_id, | |
101 | header->oem_table_id, header->oem_revision, | |
102 | header->asl_compiler_id, | |
103 | header->asl_compiler_revision)); | |
104 | } | |
0c9938cc RM |
105 | } |
106 | ||
c5fc42ac BM |
107 | /******************************************************************************* |
108 | * | |
109 | * FUNCTION: acpi_tb_validate_checksum | |
110 | * | |
111 | * PARAMETERS: Table - ACPI table to verify | |
112 | * Length - Length of entire table | |
113 | * | |
114 | * RETURN: Status | |
115 | * | |
116 | * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns | |
117 | * exception on bad checksum. | |
118 | * | |
119 | ******************************************************************************/ | |
120 | ||
121 | acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length) | |
122 | { | |
123 | u8 checksum; | |
124 | ||
125 | /* Compute the checksum on the table */ | |
126 | ||
127 | checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length); | |
128 | ||
129 | /* Checksum ok? (should be zero) */ | |
130 | ||
131 | if (checksum) { | |
132 | ACPI_WARNING((AE_INFO, | |
133 | "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X", | |
134 | table->signature, table->checksum, | |
135 | (u8) (table->checksum - checksum))); | |
136 | ||
137 | #if (ACPI_CHECKSUM_ABORT) | |
138 | ||
139 | return (AE_BAD_CHECKSUM); | |
140 | #endif | |
141 | } | |
142 | ||
143 | return (AE_OK); | |
144 | } | |
145 | ||
1da177e4 LT |
146 | /******************************************************************************* |
147 | * | |
f3d2e786 | 148 | * FUNCTION: acpi_tb_checksum |
1da177e4 | 149 | * |
f3d2e786 BM |
150 | * PARAMETERS: Buffer - Pointer to memory region to be checked |
151 | * Length - Length of this memory region | |
1da177e4 | 152 | * |
f3d2e786 | 153 | * RETURN: Checksum (u8) |
1da177e4 | 154 | * |
f3d2e786 | 155 | * DESCRIPTION: Calculates circular checksum of memory region. |
1da177e4 LT |
156 | * |
157 | ******************************************************************************/ | |
158 | ||
f3d2e786 | 159 | u8 acpi_tb_checksum(u8 * buffer, acpi_native_uint length) |
793c2388 | 160 | { |
793c2388 | 161 | u8 sum = 0; |
f3d2e786 | 162 | u8 *end = buffer + length; |
793c2388 | 163 | |
f3d2e786 BM |
164 | while (buffer < end) { |
165 | sum = (u8) (sum + *(buffer++)); | |
793c2388 BM |
166 | } |
167 | ||
f3d2e786 | 168 | return sum; |
793c2388 BM |
169 | } |
170 | ||
1da177e4 LT |
171 | /******************************************************************************* |
172 | * | |
c5fc42ac | 173 | * FUNCTION: acpi_tb_install_table |
1da177e4 | 174 | * |
c5fc42ac BM |
175 | * PARAMETERS: Address - Physical address of DSDT or FACS |
176 | * Flags - Flags | |
177 | * Signature - Table signature, NULL if no need to | |
178 | * match | |
179 | * table_index - Index into root table array | |
1da177e4 | 180 | * |
c5fc42ac | 181 | * RETURN: None |
1da177e4 | 182 | * |
c5fc42ac | 183 | * DESCRIPTION: Install an ACPI table into the global data structure. |
1da177e4 LT |
184 | * |
185 | ******************************************************************************/ | |
186 | ||
765ec201 | 187 | void |
c5fc42ac BM |
188 | acpi_tb_install_table(acpi_physical_address address, |
189 | u8 flags, char *signature, acpi_native_uint table_index) | |
1da177e4 | 190 | { |
f3d2e786 BM |
191 | struct acpi_table_header *table; |
192 | ||
c5fc42ac BM |
193 | if (!address) { |
194 | ACPI_ERROR((AE_INFO, | |
195 | "Null physical address for ACPI table [%s]", | |
196 | signature)); | |
197 | return; | |
f3d2e786 BM |
198 | } |
199 | ||
c5fc42ac BM |
200 | /* Map just the table header */ |
201 | ||
202 | table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); | |
f3d2e786 | 203 | if (!table) { |
c5fc42ac BM |
204 | return; |
205 | } | |
206 | ||
207 | /* If a particular signature is expected, signature must match */ | |
208 | ||
209 | if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) { | |
210 | ACPI_ERROR((AE_INFO, | |
211 | "Invalid signature 0x%X for ACPI table [%s]", | |
212 | *ACPI_CAST_PTR(u32, table->signature), signature)); | |
213 | goto unmap_and_exit; | |
f3d2e786 BM |
214 | } |
215 | ||
c5fc42ac BM |
216 | /* Initialize the table entry */ |
217 | ||
218 | acpi_gbl_root_table_list.tables[table_index].address = address; | |
219 | acpi_gbl_root_table_list.tables[table_index].length = table->length; | |
220 | acpi_gbl_root_table_list.tables[table_index].flags = flags; | |
f3d2e786 BM |
221 | |
222 | ACPI_MOVE_32_TO_32(& | |
c5fc42ac BM |
223 | (acpi_gbl_root_table_list.tables[table_index]. |
224 | signature), table->signature); | |
f3d2e786 | 225 | |
c5fc42ac | 226 | acpi_tb_print_table_header(address, table); |
f3d2e786 | 227 | |
c5fc42ac | 228 | if (table_index == ACPI_TABLE_INDEX_DSDT) { |
f3d2e786 | 229 | |
c5fc42ac | 230 | /* Global integer width is based upon revision of the DSDT */ |
f3d2e786 | 231 | |
c5fc42ac BM |
232 | acpi_ut_set_integer_width(table->revision); |
233 | } | |
234 | ||
235 | unmap_and_exit: | |
f3d2e786 | 236 | acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); |
c5fc42ac | 237 | } |
f3d2e786 | 238 | |
a4bbb810 BM |
239 | /******************************************************************************* |
240 | * | |
241 | * FUNCTION: acpi_tb_get_root_table_entry | |
242 | * | |
243 | * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry | |
244 | * table_entry_size - sizeof 32 or 64 (RSDT or XSDT) | |
245 | * | |
246 | * RETURN: Physical address extracted from the root table | |
247 | * | |
248 | * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on | |
249 | * both 32-bit and 64-bit platforms | |
250 | * | |
251 | * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on | |
252 | * 64-bit platforms. | |
253 | * | |
254 | ******************************************************************************/ | |
255 | ||
256 | static acpi_physical_address | |
257 | acpi_tb_get_root_table_entry(u8 * table_entry, | |
258 | acpi_native_uint table_entry_size) | |
259 | { | |
260 | u64 address64; | |
261 | ||
262 | /* | |
263 | * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): | |
264 | * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT | |
265 | */ | |
266 | if (table_entry_size == sizeof(u32)) { | |
267 | /* | |
268 | * 32-bit platform, RSDT: Return 32-bit table entry | |
269 | * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return | |
270 | */ | |
271 | return ((acpi_physical_address) | |
272 | (*ACPI_CAST_PTR(u32, table_entry))); | |
273 | } else { | |
274 | /* | |
275 | * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return | |
276 | * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit | |
277 | */ | |
278 | ACPI_MOVE_64_TO_64(&address64, table_entry); | |
279 | ||
280 | #if ACPI_MACHINE_WIDTH == 32 | |
281 | if (address64 > ACPI_UINT32_MAX) { | |
282 | ||
283 | /* Will truncate 64-bit address to 32 bits */ | |
284 | ||
285 | ACPI_WARNING((AE_INFO, | |
286 | "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating", | |
287 | ACPI_FORMAT_UINT64(address64))); | |
288 | } | |
289 | #endif | |
290 | return ((acpi_physical_address) (address64)); | |
291 | } | |
292 | } | |
293 | ||
793c2388 BM |
294 | /******************************************************************************* |
295 | * | |
f3d2e786 | 296 | * FUNCTION: acpi_tb_parse_root_table |
793c2388 | 297 | * |
f3d2e786 BM |
298 | * PARAMETERS: Rsdp - Pointer to the RSDP |
299 | * Flags - Flags | |
300 | * | |
301 | * RETURN: Status | |
793c2388 | 302 | * |
f3d2e786 BM |
303 | * DESCRIPTION: This function is called to parse the Root System Description |
304 | * Table (RSDT or XSDT) | |
793c2388 | 305 | * |
f3d2e786 BM |
306 | * NOTE: Tables are mapped (not copied) for efficiency. The FACS must |
307 | * be mapped and cannot be copied because it contains the actual | |
308 | * memory location of the ACPI Global Lock. | |
793c2388 BM |
309 | * |
310 | ******************************************************************************/ | |
311 | ||
ad71860a | 312 | acpi_status __init |
c5fc42ac | 313 | acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags) |
793c2388 | 314 | { |
c5fc42ac BM |
315 | struct acpi_table_rsdp *rsdp; |
316 | acpi_native_uint table_entry_size; | |
317 | acpi_native_uint i; | |
318 | u32 table_count; | |
f3d2e786 BM |
319 | struct acpi_table_header *table; |
320 | acpi_physical_address address; | |
321 | u32 length; | |
322 | u8 *table_entry; | |
f3d2e786 BM |
323 | acpi_status status; |
324 | ||
325 | ACPI_FUNCTION_TRACE(tb_parse_root_table); | |
326 | ||
c5fc42ac BM |
327 | /* |
328 | * Map the entire RSDP and extract the address of the RSDT or XSDT | |
329 | */ | |
330 | rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp)); | |
331 | if (!rsdp) { | |
332 | return_ACPI_STATUS(AE_NO_MEMORY); | |
333 | } | |
334 | ||
335 | acpi_tb_print_table_header(rsdp_address, | |
336 | ACPI_CAST_PTR(struct acpi_table_header, | |
337 | rsdp)); | |
338 | ||
f3d2e786 BM |
339 | /* Differentiate between RSDT and XSDT root tables */ |
340 | ||
341 | if (rsdp->revision > 1 && rsdp->xsdt_physical_address) { | |
342 | /* | |
343 | * Root table is an XSDT (64-bit physical addresses). We must use the | |
344 | * XSDT if the revision is > 1 and the XSDT pointer is present, as per | |
345 | * the ACPI specification. | |
346 | */ | |
c5fc42ac BM |
347 | address = (acpi_physical_address) rsdp->xsdt_physical_address; |
348 | table_entry_size = sizeof(u64); | |
f3d2e786 BM |
349 | } else { |
350 | /* Root table is an RSDT (32-bit physical addresses) */ | |
351 | ||
c5fc42ac BM |
352 | address = (acpi_physical_address) rsdp->rsdt_physical_address; |
353 | table_entry_size = sizeof(u32); | |
f3d2e786 | 354 | } |
793c2388 | 355 | |
c5fc42ac BM |
356 | /* |
357 | * It is not possible to map more than one entry in some environments, | |
358 | * so unmap the RSDP here before mapping other tables | |
359 | */ | |
360 | acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); | |
361 | ||
362 | /* Map the RSDT/XSDT table header to get the full table length */ | |
793c2388 | 363 | |
f3d2e786 BM |
364 | table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); |
365 | if (!table) { | |
c5fc42ac | 366 | return_ACPI_STATUS(AE_NO_MEMORY); |
f3d2e786 BM |
367 | } |
368 | ||
c5fc42ac BM |
369 | acpi_tb_print_table_header(address, table); |
370 | ||
f3d2e786 BM |
371 | /* Get the length of the full table, verify length and map entire table */ |
372 | ||
373 | length = table->length; | |
374 | acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); | |
375 | ||
376 | if (length < sizeof(struct acpi_table_header)) { | |
377 | ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT", | |
378 | length)); | |
c5fc42ac | 379 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
f3d2e786 BM |
380 | } |
381 | ||
382 | table = acpi_os_map_memory(address, length); | |
383 | if (!table) { | |
c5fc42ac | 384 | return_ACPI_STATUS(AE_NO_MEMORY); |
f3d2e786 BM |
385 | } |
386 | ||
387 | /* Validate the root table checksum */ | |
388 | ||
c5fc42ac BM |
389 | status = acpi_tb_verify_checksum(table, length); |
390 | if (ACPI_FAILURE(status)) { | |
f3d2e786 | 391 | acpi_os_unmap_memory(table, length); |
c5fc42ac | 392 | return_ACPI_STATUS(status); |
f3d2e786 | 393 | } |
f3d2e786 BM |
394 | |
395 | /* Calculate the number of tables described in the root table */ | |
396 | ||
397 | table_count = | |
a4bbb810 BM |
398 | (u32) ((table->length - |
399 | sizeof(struct acpi_table_header)) / table_entry_size); | |
52fc0b02 | 400 | |
c5fc42ac BM |
401 | /* |
402 | * First two entries in the table array are reserved for the DSDT and FACS, | |
403 | * which are not actually present in the RSDT/XSDT - they come from the FADT | |
404 | */ | |
f3d2e786 BM |
405 | table_entry = |
406 | ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header); | |
407 | acpi_gbl_root_table_list.count = 2; | |
1da177e4 | 408 | |
f3d2e786 | 409 | /* |
c5fc42ac | 410 | * Initialize the root table array from the RSDT/XSDT |
f3d2e786 | 411 | */ |
c5fc42ac | 412 | for (i = 0; i < table_count; i++) { |
f3d2e786 BM |
413 | if (acpi_gbl_root_table_list.count >= |
414 | acpi_gbl_root_table_list.size) { | |
c5fc42ac BM |
415 | |
416 | /* There is no more room in the root table array, attempt resize */ | |
417 | ||
f3d2e786 BM |
418 | status = acpi_tb_resize_root_table_list(); |
419 | if (ACPI_FAILURE(status)) { | |
420 | ACPI_WARNING((AE_INFO, | |
421 | "Truncating %u table entries!", | |
422 | (unsigned) | |
423 | (acpi_gbl_root_table_list.size - | |
424 | acpi_gbl_root_table_list. | |
425 | count))); | |
426 | break; | |
427 | } | |
428 | } | |
429 | ||
a4bbb810 BM |
430 | /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ |
431 | ||
432 | acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count]. | |
433 | address = | |
434 | acpi_tb_get_root_table_entry(table_entry, table_entry_size); | |
f3d2e786 | 435 | |
c5fc42ac | 436 | table_entry += table_entry_size; |
f3d2e786 | 437 | acpi_gbl_root_table_list.count++; |
1da177e4 | 438 | } |
793c2388 | 439 | |
f3d2e786 BM |
440 | /* |
441 | * It is not possible to map more than one entry in some environments, | |
442 | * so unmap the root table here before mapping other tables | |
443 | */ | |
444 | acpi_os_unmap_memory(table, length); | |
445 | ||
c5fc42ac BM |
446 | /* |
447 | * Complete the initialization of the root table array by examining | |
448 | * the header of each table | |
449 | */ | |
f3d2e786 | 450 | for (i = 2; i < acpi_gbl_root_table_list.count; i++) { |
c5fc42ac BM |
451 | acpi_tb_install_table(acpi_gbl_root_table_list.tables[i]. |
452 | address, flags, NULL, i); | |
f3d2e786 | 453 | |
c5fc42ac | 454 | /* Special case for FADT - get the DSDT and FACS */ |
f3d2e786 | 455 | |
c5fc42ac BM |
456 | if (ACPI_COMPARE_NAME |
457 | (&acpi_gbl_root_table_list.tables[i].signature, | |
458 | ACPI_SIG_FADT)) { | |
459 | acpi_tb_parse_fadt(i, flags); | |
f3d2e786 BM |
460 | } |
461 | } | |
462 | ||
463 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
464 | } |
465 | ||
f3d2e786 | 466 | /****************************************************************************** |
44f6c012 | 467 | * |
f3d2e786 | 468 | * FUNCTION: acpi_tb_map |
44f6c012 | 469 | * |
f3d2e786 BM |
470 | * PARAMETERS: Address - Address to be mapped |
471 | * Length - Length to be mapped | |
472 | * Flags - Logical or physical addressing mode | |
44f6c012 | 473 | * |
f3d2e786 | 474 | * RETURN: Pointer to mapped region |
44f6c012 | 475 | * |
f3d2e786 BM |
476 | * DESCRIPTION: Maps memory according to flag |
477 | * | |
478 | *****************************************************************************/ | |
44f6c012 | 479 | |
f3d2e786 | 480 | void *acpi_tb_map(acpi_physical_address address, u32 length, u32 flags) |
44f6c012 | 481 | { |
44f6c012 | 482 | |
f3d2e786 BM |
483 | if (flags == ACPI_TABLE_ORIGIN_MAPPED) { |
484 | return (acpi_os_map_memory(address, length)); | |
485 | } else { | |
486 | return (ACPI_CAST_PTR(void, address)); | |
487 | } | |
488 | } | |
44f6c012 | 489 | |
f3d2e786 BM |
490 | /****************************************************************************** |
491 | * | |
492 | * FUNCTION: acpi_tb_unmap | |
493 | * | |
494 | * PARAMETERS: Pointer - To mapped region | |
495 | * Length - Length to be unmapped | |
496 | * Flags - Logical or physical addressing mode | |
497 | * | |
498 | * RETURN: None | |
499 | * | |
500 | * DESCRIPTION: Unmaps memory according to flag | |
501 | * | |
502 | *****************************************************************************/ | |
44f6c012 | 503 | |
f3d2e786 BM |
504 | void acpi_tb_unmap(void *pointer, u32 length, u32 flags) |
505 | { | |
44f6c012 | 506 | |
f3d2e786 BM |
507 | if (flags == ACPI_TABLE_ORIGIN_MAPPED) { |
508 | acpi_os_unmap_memory(pointer, length); | |
509 | } | |
44f6c012 | 510 | } |