Commit | Line | Data |
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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psargs - Parse AML opcode arguments | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, 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 "acparser.h" | |
47 | #include "amlcode.h" | |
48 | #include "acnamesp.h" | |
49 | #include "acdispat.h" | |
1da177e4 LT |
50 | |
51 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 52 | ACPI_MODULE_NAME("psargs") |
1da177e4 | 53 | |
44f6c012 | 54 | /* Local prototypes */ |
44f6c012 | 55 | static u32 |
4be44fcd | 56 | acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state); |
44f6c012 | 57 | |
4be44fcd LB |
58 | static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state |
59 | *parser_state); | |
1da177e4 LT |
60 | |
61 | /******************************************************************************* | |
62 | * | |
63 | * FUNCTION: acpi_ps_get_next_package_length | |
64 | * | |
65 | * PARAMETERS: parser_state - Current parser state object | |
66 | * | |
c51a4de8 | 67 | * RETURN: Decoded package length. On completion, the AML pointer points |
1da177e4 LT |
68 | * past the length byte or bytes. |
69 | * | |
c51a4de8 BM |
70 | * DESCRIPTION: Decode and return a package length field. |
71 | * Note: Largest package length is 28 bits, from ACPI specification | |
1da177e4 LT |
72 | * |
73 | ******************************************************************************/ | |
74 | ||
44f6c012 | 75 | static u32 |
4be44fcd | 76 | acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state) |
1da177e4 | 77 | { |
c51a4de8 BM |
78 | u8 *aml = parser_state->aml; |
79 | u32 package_length = 0; | |
67a119f9 | 80 | u32 byte_count; |
c51a4de8 | 81 | u8 byte_zero_mask = 0x3F; /* Default [0:5] */ |
1da177e4 | 82 | |
b229cf92 | 83 | ACPI_FUNCTION_TRACE(ps_get_next_package_length); |
1da177e4 | 84 | |
c51a4de8 BM |
85 | /* |
86 | * Byte 0 bits [6:7] contain the number of additional bytes | |
87 | * used to encode the package length, either 0,1,2, or 3 | |
88 | */ | |
89 | byte_count = (aml[0] >> 6); | |
67a119f9 | 90 | parser_state->aml += ((acpi_size) byte_count + 1); |
1da177e4 | 91 | |
c51a4de8 | 92 | /* Get bytes 3, 2, 1 as needed */ |
1da177e4 | 93 | |
c51a4de8 BM |
94 | while (byte_count) { |
95 | /* | |
96 | * Final bit positions for the package length bytes: | |
97 | * Byte3->[20:27] | |
98 | * Byte2->[12:19] | |
99 | * Byte1->[04:11] | |
100 | * Byte0->[00:03] | |
101 | */ | |
102 | package_length |= (aml[byte_count] << ((byte_count << 3) - 4)); | |
1da177e4 | 103 | |
c51a4de8 BM |
104 | byte_zero_mask = 0x0F; /* Use bits [0:3] of byte 0 */ |
105 | byte_count--; | |
1da177e4 LT |
106 | } |
107 | ||
c51a4de8 BM |
108 | /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */ |
109 | ||
110 | package_length |= (aml[0] & byte_zero_mask); | |
111 | return_UINT32(package_length); | |
1da177e4 LT |
112 | } |
113 | ||
1da177e4 LT |
114 | /******************************************************************************* |
115 | * | |
116 | * FUNCTION: acpi_ps_get_next_package_end | |
117 | * | |
118 | * PARAMETERS: parser_state - Current parser state object | |
119 | * | |
120 | * RETURN: Pointer to end-of-package +1 | |
121 | * | |
122 | * DESCRIPTION: Get next package length and return a pointer past the end of | |
123 | * the package. Consumes the package length field | |
124 | * | |
125 | ******************************************************************************/ | |
126 | ||
4be44fcd | 127 | u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state) |
1da177e4 | 128 | { |
4be44fcd | 129 | u8 *start = parser_state->aml; |
c51a4de8 | 130 | u32 package_length; |
1da177e4 | 131 | |
b229cf92 | 132 | ACPI_FUNCTION_TRACE(ps_get_next_package_end); |
1da177e4 | 133 | |
c51a4de8 | 134 | /* Function below updates parser_state->Aml */ |
1da177e4 | 135 | |
c51a4de8 | 136 | package_length = acpi_ps_get_next_package_length(parser_state); |
1da177e4 | 137 | |
c51a4de8 | 138 | return_PTR(start + package_length); /* end of package */ |
1da177e4 LT |
139 | } |
140 | ||
1da177e4 LT |
141 | /******************************************************************************* |
142 | * | |
143 | * FUNCTION: acpi_ps_get_next_namestring | |
144 | * | |
145 | * PARAMETERS: parser_state - Current parser state object | |
146 | * | |
147 | * RETURN: Pointer to the start of the name string (pointer points into | |
148 | * the AML. | |
149 | * | |
150 | * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name | |
151 | * prefix characters. Set parser state to point past the string. | |
152 | * (Name is consumed from the AML.) | |
153 | * | |
154 | ******************************************************************************/ | |
155 | ||
4be44fcd | 156 | char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state) |
1da177e4 | 157 | { |
4be44fcd LB |
158 | u8 *start = parser_state->aml; |
159 | u8 *end = parser_state->aml; | |
1da177e4 | 160 | |
b229cf92 | 161 | ACPI_FUNCTION_TRACE(ps_get_next_namestring); |
1da177e4 | 162 | |
c51a4de8 | 163 | /* Point past any namestring prefix characters (backslash or carat) */ |
1da177e4 | 164 | |
c51a4de8 | 165 | while (acpi_ps_is_prefix_char(*end)) { |
1da177e4 LT |
166 | end++; |
167 | } | |
168 | ||
c51a4de8 | 169 | /* Decode the path prefix character */ |
1da177e4 | 170 | |
c51a4de8 | 171 | switch (*end) { |
1da177e4 LT |
172 | case 0: |
173 | ||
174 | /* null_name */ | |
175 | ||
176 | if (end == start) { | |
177 | start = NULL; | |
178 | } | |
179 | end++; | |
180 | break; | |
181 | ||
182 | case AML_DUAL_NAME_PREFIX: | |
183 | ||
184 | /* Two name segments */ | |
185 | ||
186 | end += 1 + (2 * ACPI_NAME_SIZE); | |
187 | break; | |
188 | ||
189 | case AML_MULTI_NAME_PREFIX_OP: | |
190 | ||
c51a4de8 | 191 | /* Multiple name segments, 4 chars each, count in next byte */ |
1da177e4 | 192 | |
c51a4de8 | 193 | end += 2 + (*(end + 1) * ACPI_NAME_SIZE); |
1da177e4 LT |
194 | break; |
195 | ||
196 | default: | |
197 | ||
198 | /* Single name segment */ | |
199 | ||
200 | end += ACPI_NAME_SIZE; | |
201 | break; | |
202 | } | |
203 | ||
c51a4de8 | 204 | parser_state->aml = end; |
4be44fcd | 205 | return_PTR((char *)start); |
1da177e4 LT |
206 | } |
207 | ||
1da177e4 LT |
208 | /******************************************************************************* |
209 | * | |
210 | * FUNCTION: acpi_ps_get_next_namepath | |
211 | * | |
212 | * PARAMETERS: parser_state - Current parser state object | |
213 | * Arg - Where the namepath will be stored | |
214 | * arg_count - If the namepath points to a control method | |
215 | * the method's argument is returned here. | |
defba1d8 | 216 | * possible_method_call - Whether the namepath can possibly be the |
1da177e4 LT |
217 | * start of a method call |
218 | * | |
219 | * RETURN: Status | |
220 | * | |
221 | * DESCRIPTION: Get next name (if method call, return # of required args). | |
222 | * Names are looked up in the internal namespace to determine | |
223 | * if the name represents a control method. If a method | |
224 | * is found, the number of arguments to the method is returned. | |
225 | * This information is critical for parsing to continue correctly. | |
226 | * | |
227 | ******************************************************************************/ | |
228 | ||
229 | acpi_status | |
4be44fcd LB |
230 | acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state, |
231 | struct acpi_parse_state *parser_state, | |
defba1d8 | 232 | union acpi_parse_object *arg, u8 possible_method_call) |
1da177e4 | 233 | { |
14808822 | 234 | acpi_status status; |
4be44fcd LB |
235 | char *path; |
236 | union acpi_parse_object *name_op; | |
4be44fcd LB |
237 | union acpi_operand_object *method_desc; |
238 | struct acpi_namespace_node *node; | |
bc7a36ab | 239 | u8 *start = parser_state->aml; |
1da177e4 | 240 | |
b229cf92 | 241 | ACPI_FUNCTION_TRACE(ps_get_next_namepath); |
1da177e4 | 242 | |
4be44fcd | 243 | path = acpi_ps_get_next_namestring(parser_state); |
defba1d8 | 244 | acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP); |
1da177e4 | 245 | |
defba1d8 | 246 | /* Null path case is allowed, just exit */ |
1da177e4 | 247 | |
defba1d8 BM |
248 | if (!path) { |
249 | arg->common.value.name = path; | |
250 | return_ACPI_STATUS(AE_OK); | |
251 | } | |
252 | ||
defba1d8 | 253 | /* |
14808822 LM |
254 | * Lookup the name in the internal namespace, starting with the current |
255 | * scope. We don't want to add anything new to the namespace here, | |
256 | * however, so we use MODE_EXECUTE. | |
defba1d8 BM |
257 | * Allow searching of the parent tree, but don't open a new scope - |
258 | * we just want to lookup the object (must be mode EXECUTE to perform | |
259 | * the upsearch) | |
260 | */ | |
14808822 LM |
261 | status = acpi_ns_lookup(walk_state->scope_info, path, |
262 | ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, | |
263 | ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, | |
264 | NULL, &node); | |
defba1d8 BM |
265 | |
266 | /* | |
267 | * If this name is a control method invocation, we must | |
268 | * setup the method call | |
269 | */ | |
270 | if (ACPI_SUCCESS(status) && | |
271 | possible_method_call && (node->type == ACPI_TYPE_METHOD)) { | |
8410565f | 272 | if (walk_state->opcode == AML_UNLOAD_OP) { |
bc7a36ab LM |
273 | /* |
274 | * acpi_ps_get_next_namestring has increased the AML pointer, | |
275 | * so we need to restore the saved AML pointer for method call. | |
276 | */ | |
277 | walk_state->parser_state.aml = start; | |
278 | walk_state->arg_count = 1; | |
279 | acpi_ps_init_op(arg, AML_INT_METHODCALL_OP); | |
280 | return_ACPI_STATUS(AE_OK); | |
281 | } | |
52fc0b02 | 282 | |
defba1d8 BM |
283 | /* This name is actually a control method invocation */ |
284 | ||
285 | method_desc = acpi_ns_get_attached_object(node); | |
286 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
287 | "Control Method - %p Desc %p Path=%p\n", node, | |
288 | method_desc, path)); | |
289 | ||
290 | name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP); | |
291 | if (!name_op) { | |
292 | return_ACPI_STATUS(AE_NO_MEMORY); | |
293 | } | |
294 | ||
295 | /* Change Arg into a METHOD CALL and attach name to it */ | |
296 | ||
297 | acpi_ps_init_op(arg, AML_INT_METHODCALL_OP); | |
298 | name_op->common.value.name = path; | |
299 | ||
300 | /* Point METHODCALL/NAME to the METHOD Node */ | |
301 | ||
302 | name_op->common.node = node; | |
303 | acpi_ps_append_arg(arg, name_op); | |
304 | ||
305 | if (!method_desc) { | |
b8e4d893 BM |
306 | ACPI_ERROR((AE_INFO, |
307 | "Control Method %p has no attached object", | |
308 | node)); | |
defba1d8 BM |
309 | return_ACPI_STATUS(AE_AML_INTERNAL); |
310 | } | |
311 | ||
312 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
313 | "Control Method - %p Args %X\n", | |
314 | node, method_desc->method.param_count)); | |
315 | ||
316 | /* Get the number of arguments to expect */ | |
317 | ||
318 | walk_state->arg_count = method_desc->method.param_count; | |
319 | return_ACPI_STATUS(AE_OK); | |
320 | } | |
321 | ||
322 | /* | |
323 | * Special handling if the name was not found during the lookup - | |
324 | * some not_found cases are allowed | |
325 | */ | |
326 | if (status == AE_NOT_FOUND) { | |
52fc0b02 | 327 | |
defba1d8 BM |
328 | /* 1) not_found is ok during load pass 1/2 (allow forward references) */ |
329 | ||
330 | if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) != | |
331 | ACPI_PARSE_EXECUTE) { | |
332 | status = AE_OK; | |
333 | } | |
334 | ||
335 | /* 2) not_found during a cond_ref_of(x) is ok by definition */ | |
336 | ||
337 | else if (walk_state->op->common.aml_opcode == | |
338 | AML_COND_REF_OF_OP) { | |
339 | status = AE_OK; | |
1da177e4 LT |
340 | } |
341 | ||
342 | /* | |
defba1d8 BM |
343 | * 3) not_found while building a Package is ok at this point, we |
344 | * may flag as an error later if slack mode is not enabled. | |
345 | * (Some ASL code depends on allowing this behavior) | |
1da177e4 | 346 | */ |
defba1d8 BM |
347 | else if ((arg->common.parent) && |
348 | ((arg->common.parent->common.aml_opcode == | |
349 | AML_PACKAGE_OP) | |
350 | || (arg->common.parent->common.aml_opcode == | |
351 | AML_VAR_PACKAGE_OP))) { | |
352 | status = AE_OK; | |
1da177e4 | 353 | } |
defba1d8 BM |
354 | } |
355 | ||
356 | /* Final exception check (may have been changed from code above) */ | |
357 | ||
358 | if (ACPI_FAILURE(status)) { | |
b8e4d893 | 359 | ACPI_ERROR_NAMESPACE(path, status); |
defba1d8 BM |
360 | |
361 | if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == | |
362 | ACPI_PARSE_EXECUTE) { | |
52fc0b02 | 363 | |
defba1d8 | 364 | /* Report a control method execution error */ |
1da177e4 | 365 | |
defba1d8 | 366 | status = acpi_ds_method_error(status, walk_state); |
1da177e4 LT |
367 | } |
368 | } | |
369 | ||
defba1d8 | 370 | /* Save the namepath */ |
1da177e4 | 371 | |
defba1d8 | 372 | arg->common.value.name = path; |
4be44fcd | 373 | return_ACPI_STATUS(status); |
1da177e4 LT |
374 | } |
375 | ||
1da177e4 LT |
376 | /******************************************************************************* |
377 | * | |
378 | * FUNCTION: acpi_ps_get_next_simple_arg | |
379 | * | |
380 | * PARAMETERS: parser_state - Current parser state object | |
381 | * arg_type - The argument type (AML_*_ARG) | |
382 | * Arg - Where the argument is returned | |
383 | * | |
384 | * RETURN: None | |
385 | * | |
386 | * DESCRIPTION: Get the next simple argument (constant, string, or namestring) | |
387 | * | |
388 | ******************************************************************************/ | |
389 | ||
390 | void | |
4be44fcd LB |
391 | acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state, |
392 | u32 arg_type, union acpi_parse_object *arg) | |
1da177e4 | 393 | { |
c51a4de8 BM |
394 | u32 length; |
395 | u16 opcode; | |
396 | u8 *aml = parser_state->aml; | |
1da177e4 | 397 | |
b229cf92 | 398 | ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type); |
1da177e4 LT |
399 | |
400 | switch (arg_type) { | |
401 | case ARGP_BYTEDATA: | |
402 | ||
c51a4de8 BM |
403 | /* Get 1 byte from the AML stream */ |
404 | ||
405 | opcode = AML_BYTE_OP; | |
406 | arg->common.value.integer = (acpi_integer) * aml; | |
407 | length = 1; | |
1da177e4 LT |
408 | break; |
409 | ||
1da177e4 LT |
410 | case ARGP_WORDDATA: |
411 | ||
1da177e4 LT |
412 | /* Get 2 bytes from the AML stream */ |
413 | ||
c51a4de8 BM |
414 | opcode = AML_WORD_OP; |
415 | ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml); | |
416 | length = 2; | |
1da177e4 LT |
417 | break; |
418 | ||
1da177e4 LT |
419 | case ARGP_DWORDDATA: |
420 | ||
1da177e4 LT |
421 | /* Get 4 bytes from the AML stream */ |
422 | ||
c51a4de8 BM |
423 | opcode = AML_DWORD_OP; |
424 | ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml); | |
425 | length = 4; | |
1da177e4 LT |
426 | break; |
427 | ||
1da177e4 LT |
428 | case ARGP_QWORDDATA: |
429 | ||
1da177e4 LT |
430 | /* Get 8 bytes from the AML stream */ |
431 | ||
c51a4de8 BM |
432 | opcode = AML_QWORD_OP; |
433 | ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml); | |
434 | length = 8; | |
1da177e4 LT |
435 | break; |
436 | ||
1da177e4 LT |
437 | case ARGP_CHARLIST: |
438 | ||
c51a4de8 BM |
439 | /* Get a pointer to the string, point past the string */ |
440 | ||
441 | opcode = AML_STRING_OP; | |
442 | arg->common.value.string = ACPI_CAST_PTR(char, aml); | |
1da177e4 | 443 | |
c51a4de8 BM |
444 | /* Find the null terminator */ |
445 | ||
446 | length = 0; | |
447 | while (aml[length]) { | |
448 | length++; | |
1da177e4 | 449 | } |
c51a4de8 | 450 | length++; |
1da177e4 LT |
451 | break; |
452 | ||
1da177e4 LT |
453 | case ARGP_NAME: |
454 | case ARGP_NAMESTRING: | |
455 | ||
4be44fcd LB |
456 | acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP); |
457 | arg->common.value.name = | |
458 | acpi_ps_get_next_namestring(parser_state); | |
c51a4de8 | 459 | return_VOID; |
1da177e4 | 460 | |
1da177e4 LT |
461 | default: |
462 | ||
b229cf92 | 463 | ACPI_ERROR((AE_INFO, "Invalid ArgType %X", arg_type)); |
c51a4de8 | 464 | return_VOID; |
1da177e4 LT |
465 | } |
466 | ||
c51a4de8 BM |
467 | acpi_ps_init_op(arg, opcode); |
468 | parser_state->aml += length; | |
1da177e4 LT |
469 | return_VOID; |
470 | } | |
471 | ||
1da177e4 LT |
472 | /******************************************************************************* |
473 | * | |
474 | * FUNCTION: acpi_ps_get_next_field | |
475 | * | |
476 | * PARAMETERS: parser_state - Current parser state object | |
477 | * | |
478 | * RETURN: A newly allocated FIELD op | |
479 | * | |
480 | * DESCRIPTION: Get next field (named_field, reserved_field, or access_field) | |
481 | * | |
482 | ******************************************************************************/ | |
483 | ||
4be44fcd LB |
484 | static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state |
485 | *parser_state) | |
1da177e4 | 486 | { |
4be44fcd LB |
487 | u32 aml_offset = (u32) |
488 | ACPI_PTR_DIFF(parser_state->aml, | |
489 | parser_state->aml_start); | |
490 | union acpi_parse_object *field; | |
491 | u16 opcode; | |
492 | u32 name; | |
1da177e4 | 493 | |
b229cf92 | 494 | ACPI_FUNCTION_TRACE(ps_get_next_field); |
1da177e4 | 495 | |
44f6c012 | 496 | /* Determine field type */ |
1da177e4 | 497 | |
4be44fcd | 498 | switch (ACPI_GET8(parser_state->aml)) { |
1da177e4 LT |
499 | default: |
500 | ||
501 | opcode = AML_INT_NAMEDFIELD_OP; | |
502 | break; | |
503 | ||
504 | case 0x00: | |
505 | ||
506 | opcode = AML_INT_RESERVEDFIELD_OP; | |
507 | parser_state->aml++; | |
508 | break; | |
509 | ||
510 | case 0x01: | |
511 | ||
512 | opcode = AML_INT_ACCESSFIELD_OP; | |
513 | parser_state->aml++; | |
514 | break; | |
515 | } | |
516 | ||
1da177e4 LT |
517 | /* Allocate a new field op */ |
518 | ||
4be44fcd | 519 | field = acpi_ps_alloc_op(opcode); |
1da177e4 | 520 | if (!field) { |
4be44fcd | 521 | return_PTR(NULL); |
1da177e4 LT |
522 | } |
523 | ||
524 | field->common.aml_offset = aml_offset; | |
525 | ||
526 | /* Decode the field type */ | |
527 | ||
528 | switch (opcode) { | |
529 | case AML_INT_NAMEDFIELD_OP: | |
530 | ||
531 | /* Get the 4-character name */ | |
532 | ||
4be44fcd LB |
533 | ACPI_MOVE_32_TO_32(&name, parser_state->aml); |
534 | acpi_ps_set_name(field, name); | |
1da177e4 LT |
535 | parser_state->aml += ACPI_NAME_SIZE; |
536 | ||
537 | /* Get the length which is encoded as a package length */ | |
538 | ||
4be44fcd LB |
539 | field->common.value.size = |
540 | acpi_ps_get_next_package_length(parser_state); | |
1da177e4 LT |
541 | break; |
542 | ||
1da177e4 LT |
543 | case AML_INT_RESERVEDFIELD_OP: |
544 | ||
545 | /* Get the length which is encoded as a package length */ | |
546 | ||
4be44fcd LB |
547 | field->common.value.size = |
548 | acpi_ps_get_next_package_length(parser_state); | |
1da177e4 LT |
549 | break; |
550 | ||
1da177e4 LT |
551 | case AML_INT_ACCESSFIELD_OP: |
552 | ||
553 | /* | |
554 | * Get access_type and access_attrib and merge into the field Op | |
555 | * access_type is first operand, access_attribute is second | |
556 | */ | |
4be44fcd | 557 | field->common.value.integer = |
c51a4de8 | 558 | (((u32) ACPI_GET8(parser_state->aml) << 8)); |
1da177e4 | 559 | parser_state->aml++; |
4be44fcd | 560 | field->common.value.integer |= ACPI_GET8(parser_state->aml); |
1da177e4 LT |
561 | parser_state->aml++; |
562 | break; | |
563 | ||
564 | default: | |
565 | ||
566 | /* Opcode was set in previous switch */ | |
567 | break; | |
568 | } | |
569 | ||
4be44fcd | 570 | return_PTR(field); |
1da177e4 LT |
571 | } |
572 | ||
1da177e4 LT |
573 | /******************************************************************************* |
574 | * | |
575 | * FUNCTION: acpi_ps_get_next_arg | |
576 | * | |
44f6c012 RM |
577 | * PARAMETERS: walk_state - Current state |
578 | * parser_state - Current parser state object | |
1da177e4 | 579 | * arg_type - The argument type (AML_*_ARG) |
44f6c012 | 580 | * return_arg - Where the next arg is returned |
1da177e4 LT |
581 | * |
582 | * RETURN: Status, and an op object containing the next argument. | |
583 | * | |
584 | * DESCRIPTION: Get next argument (including complex list arguments that require | |
585 | * pushing the parser stack) | |
586 | * | |
587 | ******************************************************************************/ | |
588 | ||
589 | acpi_status | |
4be44fcd LB |
590 | acpi_ps_get_next_arg(struct acpi_walk_state *walk_state, |
591 | struct acpi_parse_state *parser_state, | |
592 | u32 arg_type, union acpi_parse_object **return_arg) | |
1da177e4 | 593 | { |
4be44fcd LB |
594 | union acpi_parse_object *arg = NULL; |
595 | union acpi_parse_object *prev = NULL; | |
596 | union acpi_parse_object *field; | |
597 | u32 subop; | |
598 | acpi_status status = AE_OK; | |
1da177e4 | 599 | |
b229cf92 | 600 | ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state); |
1da177e4 LT |
601 | |
602 | switch (arg_type) { | |
603 | case ARGP_BYTEDATA: | |
604 | case ARGP_WORDDATA: | |
605 | case ARGP_DWORDDATA: | |
606 | case ARGP_CHARLIST: | |
607 | case ARGP_NAME: | |
608 | case ARGP_NAMESTRING: | |
609 | ||
44f6c012 | 610 | /* Constants, strings, and namestrings are all the same size */ |
1da177e4 | 611 | |
4be44fcd | 612 | arg = acpi_ps_alloc_op(AML_BYTE_OP); |
1da177e4 | 613 | if (!arg) { |
4be44fcd | 614 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 | 615 | } |
4be44fcd | 616 | acpi_ps_get_next_simple_arg(parser_state, arg_type, arg); |
1da177e4 LT |
617 | break; |
618 | ||
1da177e4 LT |
619 | case ARGP_PKGLENGTH: |
620 | ||
621 | /* Package length, nothing returned */ | |
622 | ||
4be44fcd LB |
623 | parser_state->pkg_end = |
624 | acpi_ps_get_next_package_end(parser_state); | |
1da177e4 LT |
625 | break; |
626 | ||
1da177e4 LT |
627 | case ARGP_FIELDLIST: |
628 | ||
629 | if (parser_state->aml < parser_state->pkg_end) { | |
52fc0b02 | 630 | |
1da177e4 LT |
631 | /* Non-empty list */ |
632 | ||
633 | while (parser_state->aml < parser_state->pkg_end) { | |
4be44fcd | 634 | field = acpi_ps_get_next_field(parser_state); |
1da177e4 | 635 | if (!field) { |
4be44fcd | 636 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
637 | } |
638 | ||
639 | if (prev) { | |
640 | prev->common.next = field; | |
4be44fcd | 641 | } else { |
1da177e4 LT |
642 | arg = field; |
643 | } | |
1da177e4 LT |
644 | prev = field; |
645 | } | |
646 | ||
647 | /* Skip to End of byte data */ | |
648 | ||
649 | parser_state->aml = parser_state->pkg_end; | |
650 | } | |
651 | break; | |
652 | ||
1da177e4 LT |
653 | case ARGP_BYTELIST: |
654 | ||
655 | if (parser_state->aml < parser_state->pkg_end) { | |
52fc0b02 | 656 | |
1da177e4 LT |
657 | /* Non-empty list */ |
658 | ||
4be44fcd | 659 | arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP); |
1da177e4 | 660 | if (!arg) { |
4be44fcd | 661 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
662 | } |
663 | ||
664 | /* Fill in bytelist data */ | |
665 | ||
44f6c012 | 666 | arg->common.value.size = (u32) |
4be44fcd LB |
667 | ACPI_PTR_DIFF(parser_state->pkg_end, |
668 | parser_state->aml); | |
1da177e4 LT |
669 | arg->named.data = parser_state->aml; |
670 | ||
671 | /* Skip to End of byte data */ | |
672 | ||
673 | parser_state->aml = parser_state->pkg_end; | |
674 | } | |
675 | break; | |
676 | ||
1da177e4 LT |
677 | case ARGP_TARGET: |
678 | case ARGP_SUPERNAME: | |
679 | case ARGP_SIMPLENAME: | |
680 | ||
4be44fcd LB |
681 | subop = acpi_ps_peek_opcode(parser_state); |
682 | if (subop == 0 || | |
683 | acpi_ps_is_leading_char(subop) || | |
684 | acpi_ps_is_prefix_char(subop)) { | |
52fc0b02 | 685 | |
1da177e4 LT |
686 | /* null_name or name_string */ |
687 | ||
4be44fcd | 688 | arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP); |
1da177e4 | 689 | if (!arg) { |
4be44fcd | 690 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
691 | } |
692 | ||
bc7a36ab LM |
693 | /* To support super_name arg of Unload */ |
694 | ||
8410565f | 695 | if (walk_state->opcode == AML_UNLOAD_OP) { |
bc7a36ab LM |
696 | status = |
697 | acpi_ps_get_next_namepath(walk_state, | |
698 | parser_state, arg, | |
699 | 1); | |
700 | ||
701 | /* | |
702 | * If the super_name arg of Unload is a method call, | |
703 | * we have restored the AML pointer, just free this Arg | |
704 | */ | |
705 | if (arg->common.aml_opcode == | |
706 | AML_INT_METHODCALL_OP) { | |
707 | acpi_ps_free_op(arg); | |
708 | arg = NULL; | |
709 | } | |
710 | } else { | |
711 | status = | |
712 | acpi_ps_get_next_namepath(walk_state, | |
713 | parser_state, arg, | |
714 | 0); | |
715 | } | |
4be44fcd | 716 | } else { |
44f6c012 | 717 | /* Single complex argument, nothing returned */ |
1da177e4 LT |
718 | |
719 | walk_state->arg_count = 1; | |
720 | } | |
721 | break; | |
722 | ||
1da177e4 LT |
723 | case ARGP_DATAOBJ: |
724 | case ARGP_TERMARG: | |
725 | ||
44f6c012 | 726 | /* Single complex argument, nothing returned */ |
1da177e4 LT |
727 | |
728 | walk_state->arg_count = 1; | |
729 | break; | |
730 | ||
1da177e4 LT |
731 | case ARGP_DATAOBJLIST: |
732 | case ARGP_TERMLIST: | |
733 | case ARGP_OBJLIST: | |
734 | ||
735 | if (parser_state->aml < parser_state->pkg_end) { | |
52fc0b02 | 736 | |
44f6c012 | 737 | /* Non-empty list of variable arguments, nothing returned */ |
1da177e4 LT |
738 | |
739 | walk_state->arg_count = ACPI_VAR_ARGS; | |
740 | } | |
741 | break; | |
742 | ||
1da177e4 LT |
743 | default: |
744 | ||
b229cf92 | 745 | ACPI_ERROR((AE_INFO, "Invalid ArgType: %X", arg_type)); |
1da177e4 LT |
746 | status = AE_AML_OPERAND_TYPE; |
747 | break; | |
748 | } | |
749 | ||
750 | *return_arg = arg; | |
4be44fcd | 751 | return_ACPI_STATUS(status); |
1da177e4 | 752 | } |