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