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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: rsxface - Public interfaces to the resource manager | |
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 | ||
44 | #include <linux/module.h> | |
45 | ||
46 | #include <acpi/acpi.h> | |
47 | #include <acpi/acresrc.h> | |
48 | ||
49 | #define _COMPONENT ACPI_RESOURCES | |
4be44fcd | 50 | ACPI_MODULE_NAME("rsxface") |
1da177e4 | 51 | |
44f6c012 | 52 | /* Local macros for 16,32-bit to 64-bit conversion */ |
44f6c012 RM |
53 | #define ACPI_COPY_FIELD(out, in, field) ((out)->field = (in)->field) |
54 | #define ACPI_COPY_ADDRESS(out, in) \ | |
55 | ACPI_COPY_FIELD(out, in, resource_type); \ | |
56 | ACPI_COPY_FIELD(out, in, producer_consumer); \ | |
57 | ACPI_COPY_FIELD(out, in, decode); \ | |
58 | ACPI_COPY_FIELD(out, in, min_address_fixed); \ | |
59 | ACPI_COPY_FIELD(out, in, max_address_fixed); \ | |
0897831b | 60 | ACPI_COPY_FIELD(out, in, info); \ |
44f6c012 | 61 | ACPI_COPY_FIELD(out, in, granularity); \ |
50eca3eb BM |
62 | ACPI_COPY_FIELD(out, in, minimum); \ |
63 | ACPI_COPY_FIELD(out, in, maximum); \ | |
64 | ACPI_COPY_FIELD(out, in, translation_offset); \ | |
44f6c012 RM |
65 | ACPI_COPY_FIELD(out, in, address_length); \ |
66 | ACPI_COPY_FIELD(out, in, resource_source); | |
c51a4de8 BM |
67 | /* Local prototypes */ |
68 | static acpi_status | |
69 | acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context); | |
70 | ||
1da177e4 LT |
71 | /******************************************************************************* |
72 | * | |
73 | * FUNCTION: acpi_get_irq_routing_table | |
74 | * | |
75 | * PARAMETERS: device_handle - a handle to the Bus device we are querying | |
76 | * ret_buffer - a pointer to a buffer to receive the | |
77 | * current resources for the device | |
78 | * | |
79 | * RETURN: Status | |
80 | * | |
81 | * DESCRIPTION: This function is called to get the IRQ routing table for a | |
82 | * specific bus. The caller must first acquire a handle for the | |
83 | * desired bus. The routine table is placed in the buffer pointed | |
84 | * to by the ret_buffer variable parameter. | |
85 | * | |
86 | * If the function fails an appropriate status will be returned | |
87 | * and the value of ret_buffer is undefined. | |
88 | * | |
89 | * This function attempts to execute the _PRT method contained in | |
90 | * the object indicated by the passed device_handle. | |
91 | * | |
92 | ******************************************************************************/ | |
c51a4de8 | 93 | |
1da177e4 | 94 | acpi_status |
4be44fcd LB |
95 | acpi_get_irq_routing_table(acpi_handle device_handle, |
96 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 97 | { |
4be44fcd | 98 | acpi_status status; |
1da177e4 | 99 | |
4be44fcd | 100 | ACPI_FUNCTION_TRACE("acpi_get_irq_routing_table "); |
1da177e4 LT |
101 | |
102 | /* | |
103 | * Must have a valid handle and buffer, So we have to have a handle | |
104 | * and a return buffer structure, and if there is a non-zero buffer length | |
105 | * we also need a valid pointer in the buffer. If it's a zero buffer length, | |
106 | * we'll be returning the needed buffer size, so keep going. | |
107 | */ | |
108 | if (!device_handle) { | |
4be44fcd | 109 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
110 | } |
111 | ||
4be44fcd LB |
112 | status = acpi_ut_validate_buffer(ret_buffer); |
113 | if (ACPI_FAILURE(status)) { | |
114 | return_ACPI_STATUS(status); | |
1da177e4 LT |
115 | } |
116 | ||
4be44fcd LB |
117 | status = acpi_rs_get_prt_method_data(device_handle, ret_buffer); |
118 | return_ACPI_STATUS(status); | |
1da177e4 LT |
119 | } |
120 | ||
1da177e4 LT |
121 | /******************************************************************************* |
122 | * | |
123 | * FUNCTION: acpi_get_current_resources | |
124 | * | |
125 | * PARAMETERS: device_handle - a handle to the device object for the | |
126 | * device we are querying | |
127 | * ret_buffer - a pointer to a buffer to receive the | |
128 | * current resources for the device | |
129 | * | |
130 | * RETURN: Status | |
131 | * | |
132 | * DESCRIPTION: This function is called to get the current resources for a | |
133 | * specific device. The caller must first acquire a handle for | |
134 | * the desired device. The resource data is placed in the buffer | |
135 | * pointed to by the ret_buffer variable parameter. | |
136 | * | |
137 | * If the function fails an appropriate status will be returned | |
138 | * and the value of ret_buffer is undefined. | |
139 | * | |
140 | * This function attempts to execute the _CRS method contained in | |
141 | * the object indicated by the passed device_handle. | |
142 | * | |
143 | ******************************************************************************/ | |
144 | ||
145 | acpi_status | |
4be44fcd LB |
146 | acpi_get_current_resources(acpi_handle device_handle, |
147 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 148 | { |
4be44fcd | 149 | acpi_status status; |
1da177e4 | 150 | |
4be44fcd | 151 | ACPI_FUNCTION_TRACE("acpi_get_current_resources"); |
1da177e4 LT |
152 | |
153 | /* | |
154 | * Must have a valid handle and buffer, So we have to have a handle | |
155 | * and a return buffer structure, and if there is a non-zero buffer length | |
156 | * we also need a valid pointer in the buffer. If it's a zero buffer length, | |
157 | * we'll be returning the needed buffer size, so keep going. | |
158 | */ | |
159 | if (!device_handle) { | |
4be44fcd | 160 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
161 | } |
162 | ||
4be44fcd LB |
163 | status = acpi_ut_validate_buffer(ret_buffer); |
164 | if (ACPI_FAILURE(status)) { | |
165 | return_ACPI_STATUS(status); | |
1da177e4 LT |
166 | } |
167 | ||
4be44fcd LB |
168 | status = acpi_rs_get_crs_method_data(device_handle, ret_buffer); |
169 | return_ACPI_STATUS(status); | |
1da177e4 | 170 | } |
1da177e4 | 171 | |
4be44fcd | 172 | EXPORT_SYMBOL(acpi_get_current_resources); |
1da177e4 LT |
173 | |
174 | /******************************************************************************* | |
175 | * | |
176 | * FUNCTION: acpi_get_possible_resources | |
177 | * | |
178 | * PARAMETERS: device_handle - a handle to the device object for the | |
179 | * device we are querying | |
180 | * ret_buffer - a pointer to a buffer to receive the | |
181 | * resources for the device | |
182 | * | |
183 | * RETURN: Status | |
184 | * | |
185 | * DESCRIPTION: This function is called to get a list of the possible resources | |
186 | * for a specific device. The caller must first acquire a handle | |
187 | * for the desired device. The resource data is placed in the | |
188 | * buffer pointed to by the ret_buffer variable. | |
189 | * | |
190 | * If the function fails an appropriate status will be returned | |
191 | * and the value of ret_buffer is undefined. | |
192 | * | |
193 | ******************************************************************************/ | |
44f6c012 | 194 | |
1da177e4 LT |
195 | #ifdef ACPI_FUTURE_USAGE |
196 | acpi_status | |
4be44fcd LB |
197 | acpi_get_possible_resources(acpi_handle device_handle, |
198 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 199 | { |
4be44fcd | 200 | acpi_status status; |
1da177e4 | 201 | |
4be44fcd | 202 | ACPI_FUNCTION_TRACE("acpi_get_possible_resources"); |
1da177e4 LT |
203 | |
204 | /* | |
205 | * Must have a valid handle and buffer, So we have to have a handle | |
206 | * and a return buffer structure, and if there is a non-zero buffer length | |
207 | * we also need a valid pointer in the buffer. If it's a zero buffer length, | |
208 | * we'll be returning the needed buffer size, so keep going. | |
209 | */ | |
210 | if (!device_handle) { | |
4be44fcd | 211 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
212 | } |
213 | ||
4be44fcd LB |
214 | status = acpi_ut_validate_buffer(ret_buffer); |
215 | if (ACPI_FAILURE(status)) { | |
216 | return_ACPI_STATUS(status); | |
1da177e4 LT |
217 | } |
218 | ||
4be44fcd LB |
219 | status = acpi_rs_get_prs_method_data(device_handle, ret_buffer); |
220 | return_ACPI_STATUS(status); | |
1da177e4 | 221 | } |
1da177e4 | 222 | |
4be44fcd LB |
223 | EXPORT_SYMBOL(acpi_get_possible_resources); |
224 | #endif /* ACPI_FUTURE_USAGE */ | |
1da177e4 LT |
225 | |
226 | /******************************************************************************* | |
227 | * | |
228 | * FUNCTION: acpi_walk_resources | |
229 | * | |
c51a4de8 | 230 | * PARAMETERS: device_handle - Handle to the device object for the |
1da177e4 | 231 | * device we are querying |
c51a4de8 | 232 | * Name - Method name of the resources we want |
1da177e4 | 233 | * (METHOD_NAME__CRS or METHOD_NAME__PRS) |
c51a4de8 BM |
234 | * user_function - Called for each resource |
235 | * Context - Passed to user_function | |
1da177e4 LT |
236 | * |
237 | * RETURN: Status | |
238 | * | |
239 | * DESCRIPTION: Retrieves the current or possible resource list for the | |
240 | * specified device. The user_function is called once for | |
241 | * each resource in the list. | |
242 | * | |
243 | ******************************************************************************/ | |
244 | ||
245 | acpi_status | |
4be44fcd | 246 | acpi_walk_resources(acpi_handle device_handle, |
c51a4de8 | 247 | char *name, |
4be44fcd | 248 | ACPI_WALK_RESOURCE_CALLBACK user_function, void *context) |
1da177e4 | 249 | { |
4be44fcd | 250 | acpi_status status; |
c51a4de8 | 251 | struct acpi_buffer buffer; |
4be44fcd | 252 | struct acpi_resource *resource; |
c51a4de8 | 253 | struct acpi_resource *resource_end; |
1da177e4 | 254 | |
4be44fcd | 255 | ACPI_FUNCTION_TRACE("acpi_walk_resources"); |
1da177e4 | 256 | |
c51a4de8 BM |
257 | /* Parameter validation */ |
258 | ||
259 | if (!device_handle || !user_function || !name || | |
260 | (ACPI_STRNCMP(name, METHOD_NAME__CRS, sizeof(METHOD_NAME__CRS)) && | |
261 | ACPI_STRNCMP(name, METHOD_NAME__PRS, sizeof(METHOD_NAME__PRS)))) { | |
4be44fcd | 262 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
263 | } |
264 | ||
c51a4de8 BM |
265 | /* Get the _CRS or _PRS resource list */ |
266 | ||
267 | buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; | |
268 | status = acpi_rs_get_method_data(device_handle, name, &buffer); | |
4be44fcd LB |
269 | if (ACPI_FAILURE(status)) { |
270 | return_ACPI_STATUS(status); | |
1da177e4 LT |
271 | } |
272 | ||
c51a4de8 | 273 | /* Buffer now contains the resource list */ |
1da177e4 | 274 | |
c51a4de8 BM |
275 | resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer); |
276 | resource_end = | |
277 | ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length); | |
1da177e4 | 278 | |
c51a4de8 | 279 | /* Walk the resource list until the end_tag is found (or buffer end) */ |
1da177e4 | 280 | |
c51a4de8 | 281 | while (resource < resource_end) { |
52fc0b02 | 282 | |
c51a4de8 BM |
283 | /* Sanity check the resource */ |
284 | ||
285 | if (resource->type > ACPI_RESOURCE_TYPE_MAX) { | |
286 | status = AE_AML_INVALID_RESOURCE_TYPE; | |
1da177e4 LT |
287 | break; |
288 | } | |
289 | ||
c51a4de8 | 290 | /* Invoke the user function, abort on any error returned */ |
1da177e4 | 291 | |
c51a4de8 BM |
292 | status = user_function(resource, context); |
293 | if (ACPI_FAILURE(status)) { | |
294 | if (status == AE_CTRL_TERMINATE) { | |
52fc0b02 | 295 | |
c51a4de8 | 296 | /* This is an OK termination by the user function */ |
1da177e4 | 297 | |
c51a4de8 BM |
298 | status = AE_OK; |
299 | } | |
1da177e4 | 300 | break; |
c51a4de8 | 301 | } |
1da177e4 | 302 | |
2ae41174 LB |
303 | /* end_tag indicates end-of-list */ |
304 | ||
305 | if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) { | |
306 | break; | |
307 | } | |
308 | ||
1da177e4 LT |
309 | /* Get the next resource descriptor */ |
310 | ||
c51a4de8 BM |
311 | resource = |
312 | ACPI_ADD_PTR(struct acpi_resource, resource, | |
313 | resource->length); | |
1da177e4 LT |
314 | } |
315 | ||
c51a4de8 | 316 | ACPI_MEM_FREE(buffer.pointer); |
4be44fcd | 317 | return_ACPI_STATUS(status); |
1da177e4 | 318 | } |
1da177e4 | 319 | |
4be44fcd | 320 | EXPORT_SYMBOL(acpi_walk_resources); |
1da177e4 LT |
321 | |
322 | /******************************************************************************* | |
323 | * | |
324 | * FUNCTION: acpi_set_current_resources | |
325 | * | |
326 | * PARAMETERS: device_handle - a handle to the device object for the | |
327 | * device we are changing the resources of | |
328 | * in_buffer - a pointer to a buffer containing the | |
329 | * resources to be set for the device | |
330 | * | |
331 | * RETURN: Status | |
332 | * | |
333 | * DESCRIPTION: This function is called to set the current resources for a | |
334 | * specific device. The caller must first acquire a handle for | |
335 | * the desired device. The resource data is passed to the routine | |
336 | * the buffer pointed to by the in_buffer variable. | |
337 | * | |
338 | ******************************************************************************/ | |
339 | ||
340 | acpi_status | |
4be44fcd LB |
341 | acpi_set_current_resources(acpi_handle device_handle, |
342 | struct acpi_buffer *in_buffer) | |
1da177e4 | 343 | { |
4be44fcd | 344 | acpi_status status; |
1da177e4 | 345 | |
4be44fcd | 346 | ACPI_FUNCTION_TRACE("acpi_set_current_resources"); |
1da177e4 | 347 | |
44f6c012 RM |
348 | /* Must have a valid handle and buffer */ |
349 | ||
4be44fcd LB |
350 | if ((!device_handle) || |
351 | (!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) { | |
352 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
353 | } |
354 | ||
4be44fcd LB |
355 | status = acpi_rs_set_srs_method_data(device_handle, in_buffer); |
356 | return_ACPI_STATUS(status); | |
1da177e4 | 357 | } |
1da177e4 | 358 | |
4be44fcd | 359 | EXPORT_SYMBOL(acpi_set_current_resources); |
1da177e4 | 360 | |
1da177e4 LT |
361 | /****************************************************************************** |
362 | * | |
363 | * FUNCTION: acpi_resource_to_address64 | |
364 | * | |
bda663d3 RM |
365 | * PARAMETERS: Resource - Pointer to a resource |
366 | * Out - Pointer to the users's return | |
1da177e4 LT |
367 | * buffer (a struct |
368 | * struct acpi_resource_address64) | |
369 | * | |
370 | * RETURN: Status | |
371 | * | |
372 | * DESCRIPTION: If the resource is an address16, address32, or address64, | |
373 | * copy it to the address64 return buffer. This saves the | |
374 | * caller from having to duplicate code for different-sized | |
375 | * addresses. | |
376 | * | |
377 | ******************************************************************************/ | |
378 | ||
379 | acpi_status | |
4be44fcd LB |
380 | acpi_resource_to_address64(struct acpi_resource *resource, |
381 | struct acpi_resource_address64 *out) | |
1da177e4 | 382 | { |
4be44fcd LB |
383 | struct acpi_resource_address16 *address16; |
384 | struct acpi_resource_address32 *address32; | |
1da177e4 | 385 | |
c51a4de8 BM |
386 | if (!resource || !out) { |
387 | return (AE_BAD_PARAMETER); | |
388 | } | |
389 | ||
390 | /* Convert 16 or 32 address descriptor to 64 */ | |
391 | ||
bda663d3 | 392 | switch (resource->type) { |
50eca3eb | 393 | case ACPI_RESOURCE_TYPE_ADDRESS16: |
1da177e4 | 394 | |
4be44fcd LB |
395 | address16 = (struct acpi_resource_address16 *)&resource->data; |
396 | ACPI_COPY_ADDRESS(out, address16); | |
1da177e4 LT |
397 | break; |
398 | ||
50eca3eb | 399 | case ACPI_RESOURCE_TYPE_ADDRESS32: |
1da177e4 | 400 | |
4be44fcd LB |
401 | address32 = (struct acpi_resource_address32 *)&resource->data; |
402 | ACPI_COPY_ADDRESS(out, address32); | |
1da177e4 LT |
403 | break; |
404 | ||
50eca3eb | 405 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
1da177e4 LT |
406 | |
407 | /* Simple copy for 64 bit source */ | |
408 | ||
4be44fcd LB |
409 | ACPI_MEMCPY(out, &resource->data, |
410 | sizeof(struct acpi_resource_address64)); | |
1da177e4 LT |
411 | break; |
412 | ||
1da177e4 LT |
413 | default: |
414 | return (AE_BAD_PARAMETER); | |
415 | } | |
416 | ||
417 | return (AE_OK); | |
418 | } | |
4be44fcd | 419 | |
1da177e4 | 420 | EXPORT_SYMBOL(acpi_resource_to_address64); |
c51a4de8 BM |
421 | |
422 | /******************************************************************************* | |
423 | * | |
424 | * FUNCTION: acpi_get_vendor_resource | |
425 | * | |
426 | * PARAMETERS: device_handle - Handle for the parent device object | |
427 | * Name - Method name for the parent resource | |
428 | * (METHOD_NAME__CRS or METHOD_NAME__PRS) | |
429 | * Uuid - Pointer to the UUID to be matched. | |
430 | * includes both subtype and 16-byte UUID | |
431 | * ret_buffer - Where the vendor resource is returned | |
432 | * | |
433 | * RETURN: Status | |
434 | * | |
435 | * DESCRIPTION: Walk a resource template for the specified evice to find a | |
436 | * vendor-defined resource that matches the supplied UUID and | |
437 | * UUID subtype. Returns a struct acpi_resource of type Vendor. | |
438 | * | |
439 | ******************************************************************************/ | |
440 | ||
441 | acpi_status | |
442 | acpi_get_vendor_resource(acpi_handle device_handle, | |
443 | char *name, | |
444 | struct acpi_vendor_uuid * uuid, | |
445 | struct acpi_buffer * ret_buffer) | |
446 | { | |
447 | struct acpi_vendor_walk_info info; | |
448 | acpi_status status; | |
449 | ||
450 | /* Other parameters are validated by acpi_walk_resources */ | |
451 | ||
452 | if (!uuid || !ret_buffer) { | |
453 | return (AE_BAD_PARAMETER); | |
454 | } | |
455 | ||
456 | info.uuid = uuid; | |
457 | info.buffer = ret_buffer; | |
458 | info.status = AE_NOT_EXIST; | |
459 | ||
460 | /* Walk the _CRS or _PRS resource list for this device */ | |
461 | ||
462 | status = | |
463 | acpi_walk_resources(device_handle, name, | |
464 | acpi_rs_match_vendor_resource, &info); | |
465 | if (ACPI_FAILURE(status)) { | |
466 | return (status); | |
467 | } | |
468 | ||
469 | return (info.status); | |
470 | } | |
471 | ||
472 | /******************************************************************************* | |
473 | * | |
474 | * FUNCTION: acpi_rs_match_vendor_resource | |
475 | * | |
476 | * PARAMETERS: ACPI_WALK_RESOURCE_CALLBACK | |
477 | * | |
478 | * RETURN: Status | |
479 | * | |
480 | * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID | |
481 | * | |
482 | ******************************************************************************/ | |
483 | ||
484 | static acpi_status | |
485 | acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context) | |
486 | { | |
487 | struct acpi_vendor_walk_info *info = context; | |
488 | struct acpi_resource_vendor_typed *vendor; | |
489 | struct acpi_buffer *buffer; | |
490 | acpi_status status; | |
491 | ||
492 | /* Ignore all descriptors except Vendor */ | |
493 | ||
494 | if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) { | |
495 | return (AE_OK); | |
496 | } | |
497 | ||
498 | vendor = &resource->data.vendor_typed; | |
499 | ||
500 | /* | |
501 | * For a valid match, these conditions must hold: | |
502 | * | |
503 | * 1) Length of descriptor data must be at least as long as a UUID struct | |
504 | * 2) The UUID subtypes must match | |
505 | * 3) The UUID data must match | |
506 | */ | |
507 | if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) || | |
508 | (vendor->uuid_subtype != info->uuid->subtype) || | |
509 | (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) { | |
510 | return (AE_OK); | |
511 | } | |
512 | ||
513 | /* Validate/Allocate/Clear caller buffer */ | |
514 | ||
515 | buffer = info->buffer; | |
516 | status = acpi_ut_initialize_buffer(buffer, resource->length); | |
517 | if (ACPI_FAILURE(status)) { | |
518 | return (status); | |
519 | } | |
520 | ||
521 | /* Found the correct resource, copy and return it */ | |
522 | ||
523 | ACPI_MEMCPY(buffer->pointer, resource, resource->length); | |
524 | buffer->length = resource->length; | |
525 | ||
526 | /* Found the desired descriptor, terminate resource walk */ | |
527 | ||
528 | info->status = AE_OK; | |
529 | return (AE_CTRL_TERMINATE); | |
530 | } |