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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exutils - interpreter/scanner utilities | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
a8357b0c | 9 | * Copyright (C) 2000 - 2010, Intel Corp. |
1da177e4 LT |
10 | * All rights reserved. |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions, and the following disclaimer, | |
17 | * without modification. | |
18 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
19 | * substantially similar to the "NO WARRANTY" disclaimer below | |
20 | * ("Disclaimer") and any redistribution must be conditioned upon | |
21 | * including a substantially similar Disclaimer requirement for further | |
22 | * binary redistribution. | |
23 | * 3. Neither the names of the above-listed copyright holders nor the names | |
24 | * of any contributors may be used to endorse or promote products derived | |
25 | * from this software without specific prior written permission. | |
26 | * | |
27 | * Alternatively, this software may be distributed under the terms of the | |
28 | * GNU General Public License ("GPL") version 2 as published by the Free | |
29 | * Software Foundation. | |
30 | * | |
31 | * NO WARRANTY | |
32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
35 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
36 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
41 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
42 | * POSSIBILITY OF SUCH DAMAGES. | |
43 | */ | |
44 | ||
1da177e4 LT |
45 | /* |
46 | * DEFINE_AML_GLOBALS is tested in amlcode.h | |
47 | * to determine whether certain global names should be "defined" or only | |
48 | * "declared" in the current compilation. This enhances maintainability | |
49 | * by enabling a single header file to embody all knowledge of the names | |
50 | * in question. | |
51 | * | |
52 | * Exactly one module of any executable should #define DEFINE_GLOBALS | |
53 | * before #including the header files which use this convention. The | |
54 | * names in question will be defined and initialized in that module, | |
55 | * and declared as extern in all other modules which #include those | |
56 | * header files. | |
57 | */ | |
58 | ||
59 | #define DEFINE_AML_GLOBALS | |
60 | ||
61 | #include <acpi/acpi.h> | |
e2f7a777 LB |
62 | #include "accommon.h" |
63 | #include "acinterp.h" | |
64 | #include "amlcode.h" | |
1da177e4 LT |
65 | |
66 | #define _COMPONENT ACPI_EXECUTER | |
4be44fcd | 67 | ACPI_MODULE_NAME("exutils") |
1da177e4 | 68 | |
44f6c012 | 69 | /* Local prototypes */ |
4be44fcd | 70 | static u32 acpi_ex_digits_needed(acpi_integer value, u32 base); |
44f6c012 RM |
71 | |
72 | #ifndef ACPI_NO_METHOD_EXECUTION | |
1da177e4 LT |
73 | /******************************************************************************* |
74 | * | |
75 | * FUNCTION: acpi_ex_enter_interpreter | |
76 | * | |
77 | * PARAMETERS: None | |
78 | * | |
4d2acd9e | 79 | * RETURN: None |
44f6c012 | 80 | * |
4d2acd9e LB |
81 | * DESCRIPTION: Enter the interpreter execution region. Failure to enter |
82 | * the interpreter region is a fatal system error. Used in | |
83 | * conjunction with exit_interpreter. | |
1da177e4 LT |
84 | * |
85 | ******************************************************************************/ | |
86 | ||
4d2acd9e | 87 | void acpi_ex_enter_interpreter(void) |
1da177e4 | 88 | { |
4be44fcd | 89 | acpi_status status; |
1da177e4 | 90 | |
977a6226 | 91 | ACPI_FUNCTION_TRACE(ex_enter_interpreter); |
1da177e4 | 92 | |
4c90ece2 | 93 | status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); |
4be44fcd | 94 | if (ACPI_FAILURE(status)) { |
4d2acd9e LB |
95 | ACPI_ERROR((AE_INFO, |
96 | "Could not acquire AML Interpreter mutex")); | |
1da177e4 LT |
97 | } |
98 | ||
4d2acd9e | 99 | return_VOID; |
1ba753ac BM |
100 | } |
101 | ||
102 | /******************************************************************************* | |
103 | * | |
4d2acd9e | 104 | * FUNCTION: acpi_ex_reacquire_interpreter |
1ba753ac BM |
105 | * |
106 | * PARAMETERS: None | |
107 | * | |
108 | * RETURN: None | |
1da177e4 | 109 | * |
4d2acd9e LB |
110 | * DESCRIPTION: Reacquire the interpreter execution region from within the |
111 | * interpreter code. Failure to enter the interpreter region is a | |
112 | * fatal system error. Used in conjuction with | |
113 | * relinquish_interpreter | |
114 | * | |
115 | ******************************************************************************/ | |
116 | ||
117 | void acpi_ex_reacquire_interpreter(void) | |
118 | { | |
119 | ACPI_FUNCTION_TRACE(ex_reacquire_interpreter); | |
120 | ||
121 | /* | |
122 | * If the global serialized flag is set, do not release the interpreter, | |
123 | * since it was not actually released by acpi_ex_relinquish_interpreter. | |
124 | * This forces the interpreter to be single threaded. | |
125 | */ | |
126 | if (!acpi_gbl_all_methods_serialized) { | |
127 | acpi_ex_enter_interpreter(); | |
128 | } | |
129 | ||
130 | return_VOID; | |
131 | } | |
132 | ||
133 | /******************************************************************************* | |
134 | * | |
135 | * FUNCTION: acpi_ex_exit_interpreter | |
136 | * | |
137 | * PARAMETERS: None | |
138 | * | |
139 | * RETURN: None | |
a8f4af6d | 140 | * |
4d2acd9e LB |
141 | * DESCRIPTION: Exit the interpreter execution region. This is the top level |
142 | * routine used to exit the interpreter when all processing has | |
143 | * been completed. | |
1da177e4 LT |
144 | * |
145 | ******************************************************************************/ | |
146 | ||
4be44fcd | 147 | void acpi_ex_exit_interpreter(void) |
1da177e4 | 148 | { |
4be44fcd | 149 | acpi_status status; |
1da177e4 | 150 | |
b229cf92 | 151 | ACPI_FUNCTION_TRACE(ex_exit_interpreter); |
1da177e4 | 152 | |
4c90ece2 | 153 | status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); |
4be44fcd | 154 | if (ACPI_FAILURE(status)) { |
4d2acd9e LB |
155 | ACPI_ERROR((AE_INFO, |
156 | "Could not release AML Interpreter mutex")); | |
157 | } | |
158 | ||
159 | return_VOID; | |
160 | } | |
161 | ||
162 | /******************************************************************************* | |
163 | * | |
164 | * FUNCTION: acpi_ex_relinquish_interpreter | |
165 | * | |
166 | * PARAMETERS: None | |
167 | * | |
168 | * RETURN: None | |
169 | * | |
170 | * DESCRIPTION: Exit the interpreter execution region, from within the | |
171 | * interpreter - before attempting an operation that will possibly | |
172 | * block the running thread. | |
173 | * | |
174 | * Cases where the interpreter is unlocked internally | |
175 | * 1) Method to be blocked on a Sleep() AML opcode | |
176 | * 2) Method to be blocked on an Acquire() AML opcode | |
177 | * 3) Method to be blocked on a Wait() AML opcode | |
178 | * 4) Method to be blocked to acquire the global lock | |
179 | * 5) Method to be blocked waiting to execute a serialized control method | |
180 | * that is currently executing | |
181 | * 6) About to invoke a user-installed opregion handler | |
182 | * | |
183 | ******************************************************************************/ | |
184 | ||
185 | void acpi_ex_relinquish_interpreter(void) | |
186 | { | |
187 | ACPI_FUNCTION_TRACE(ex_relinquish_interpreter); | |
188 | ||
189 | /* | |
190 | * If the global serialized flag is set, do not release the interpreter. | |
191 | * This forces the interpreter to be single threaded. | |
192 | */ | |
193 | if (!acpi_gbl_all_methods_serialized) { | |
194 | acpi_ex_exit_interpreter(); | |
1da177e4 LT |
195 | } |
196 | ||
197 | return_VOID; | |
198 | } | |
199 | ||
1da177e4 LT |
200 | /******************************************************************************* |
201 | * | |
202 | * FUNCTION: acpi_ex_truncate_for32bit_table | |
203 | * | |
204 | * PARAMETERS: obj_desc - Object to be truncated | |
205 | * | |
206 | * RETURN: none | |
207 | * | |
4d2acd9e LB |
208 | * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is |
209 | * 32-bit, as determined by the revision of the DSDT. | |
1da177e4 LT |
210 | * |
211 | ******************************************************************************/ | |
212 | ||
4be44fcd | 213 | void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc) |
1da177e4 LT |
214 | { |
215 | ||
4be44fcd | 216 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
217 | |
218 | /* | |
219 | * Object must be a valid number and we must be executing | |
4e3156b1 | 220 | * a control method. NS node could be there for AML_INT_NAMEPATH_OP. |
1da177e4 LT |
221 | */ |
222 | if ((!obj_desc) || | |
4e3156b1 | 223 | (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) || |
3371c19c | 224 | (obj_desc->common.type != ACPI_TYPE_INTEGER)) { |
1da177e4 LT |
225 | return; |
226 | } | |
227 | ||
228 | if (acpi_gbl_integer_byte_width == 4) { | |
229 | /* | |
230 | * We are running a method that exists in a 32-bit ACPI table. | |
231 | * Truncate the value to 32 bits by zeroing out the upper 32-bit field | |
232 | */ | |
233 | obj_desc->integer.value &= (acpi_integer) ACPI_UINT32_MAX; | |
234 | } | |
235 | } | |
236 | ||
1da177e4 LT |
237 | /******************************************************************************* |
238 | * | |
239 | * FUNCTION: acpi_ex_acquire_global_lock | |
240 | * | |
241 | * PARAMETERS: field_flags - Flags with Lock rule: | |
242 | * always_lock or never_lock | |
243 | * | |
ba886cd4 | 244 | * RETURN: None |
1da177e4 | 245 | * |
ba886cd4 BM |
246 | * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field |
247 | * flags specifiy that it is to be obtained before field access. | |
1da177e4 LT |
248 | * |
249 | ******************************************************************************/ | |
250 | ||
ba886cd4 | 251 | void acpi_ex_acquire_global_lock(u32 field_flags) |
1da177e4 | 252 | { |
4be44fcd | 253 | acpi_status status; |
1da177e4 | 254 | |
b229cf92 | 255 | ACPI_FUNCTION_TRACE(ex_acquire_global_lock); |
1da177e4 | 256 | |
ba886cd4 BM |
257 | /* Only use the lock if the always_lock bit is set */ |
258 | ||
259 | if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) { | |
260 | return_VOID; | |
261 | } | |
1da177e4 | 262 | |
ba886cd4 | 263 | /* Attempt to get the global lock, wait forever */ |
52fc0b02 | 264 | |
ba886cd4 BM |
265 | status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER, |
266 | acpi_gbl_global_lock_mutex, | |
267 | acpi_os_get_thread_id()); | |
1da177e4 | 268 | |
ba886cd4 BM |
269 | if (ACPI_FAILURE(status)) { |
270 | ACPI_EXCEPTION((AE_INFO, status, | |
271 | "Could not acquire Global Lock")); | |
1da177e4 LT |
272 | } |
273 | ||
ba886cd4 | 274 | return_VOID; |
1da177e4 LT |
275 | } |
276 | ||
1da177e4 LT |
277 | /******************************************************************************* |
278 | * | |
279 | * FUNCTION: acpi_ex_release_global_lock | |
280 | * | |
f02e9fa1 BM |
281 | * PARAMETERS: field_flags - Flags with Lock rule: |
282 | * always_lock or never_lock | |
1da177e4 | 283 | * |
44f6c012 | 284 | * RETURN: None |
1da177e4 | 285 | * |
ba886cd4 | 286 | * DESCRIPTION: Release the ACPI hardware Global Lock |
1da177e4 LT |
287 | * |
288 | ******************************************************************************/ | |
289 | ||
f02e9fa1 | 290 | void acpi_ex_release_global_lock(u32 field_flags) |
1da177e4 | 291 | { |
4be44fcd | 292 | acpi_status status; |
1da177e4 | 293 | |
b229cf92 | 294 | ACPI_FUNCTION_TRACE(ex_release_global_lock); |
1da177e4 | 295 | |
f02e9fa1 BM |
296 | /* Only use the lock if the always_lock bit is set */ |
297 | ||
298 | if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) { | |
299 | return_VOID; | |
300 | } | |
301 | ||
ba886cd4 | 302 | /* Release the global lock */ |
52fc0b02 | 303 | |
ba886cd4 BM |
304 | status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex); |
305 | if (ACPI_FAILURE(status)) { | |
52fc0b02 | 306 | |
ba886cd4 | 307 | /* Report the error, but there isn't much else we can do */ |
1da177e4 | 308 | |
ba886cd4 BM |
309 | ACPI_EXCEPTION((AE_INFO, status, |
310 | "Could not release Global Lock")); | |
1da177e4 LT |
311 | } |
312 | ||
313 | return_VOID; | |
314 | } | |
315 | ||
1da177e4 LT |
316 | /******************************************************************************* |
317 | * | |
318 | * FUNCTION: acpi_ex_digits_needed | |
319 | * | |
320 | * PARAMETERS: Value - Value to be represented | |
321 | * Base - Base of representation | |
322 | * | |
44f6c012 RM |
323 | * RETURN: The number of digits. |
324 | * | |
325 | * DESCRIPTION: Calculate the number of digits needed to represent the Value | |
326 | * in the given Base (Radix) | |
1da177e4 LT |
327 | * |
328 | ******************************************************************************/ | |
329 | ||
4be44fcd | 330 | static u32 acpi_ex_digits_needed(acpi_integer value, u32 base) |
1da177e4 | 331 | { |
4be44fcd LB |
332 | u32 num_digits; |
333 | acpi_integer current_value; | |
1da177e4 | 334 | |
b229cf92 | 335 | ACPI_FUNCTION_TRACE(ex_digits_needed); |
1da177e4 LT |
336 | |
337 | /* acpi_integer is unsigned, so we don't worry about a '-' prefix */ | |
338 | ||
339 | if (value == 0) { | |
50eca3eb | 340 | return_UINT32(1); |
1da177e4 LT |
341 | } |
342 | ||
343 | current_value = value; | |
344 | num_digits = 0; | |
345 | ||
346 | /* Count the digits in the requested base */ | |
347 | ||
348 | while (current_value) { | |
4be44fcd LB |
349 | (void)acpi_ut_short_divide(current_value, base, ¤t_value, |
350 | NULL); | |
1da177e4 LT |
351 | num_digits++; |
352 | } | |
353 | ||
50eca3eb | 354 | return_UINT32(num_digits); |
1da177e4 LT |
355 | } |
356 | ||
1da177e4 LT |
357 | /******************************************************************************* |
358 | * | |
359 | * FUNCTION: acpi_ex_eisa_id_to_string | |
360 | * | |
15b8dd53 | 361 | * PARAMETERS: compressed_id - EISAID to be converted |
1da177e4 LT |
362 | * out_string - Where to put the converted string (8 bytes) |
363 | * | |
44f6c012 RM |
364 | * RETURN: None |
365 | * | |
15b8dd53 BM |
366 | * DESCRIPTION: Convert a numeric EISAID to string representation. Return |
367 | * buffer must be large enough to hold the string. The string | |
368 | * returned is always exactly of length ACPI_EISAID_STRING_SIZE | |
369 | * (includes null terminator). The EISAID is always 32 bits. | |
1da177e4 LT |
370 | * |
371 | ******************************************************************************/ | |
372 | ||
15b8dd53 | 373 | void acpi_ex_eisa_id_to_string(char *out_string, acpi_integer compressed_id) |
1da177e4 | 374 | { |
15b8dd53 | 375 | u32 swapped_id; |
1da177e4 | 376 | |
4be44fcd | 377 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 378 | |
15b8dd53 BM |
379 | /* The EISAID should be a 32-bit integer */ |
380 | ||
381 | if (compressed_id > ACPI_UINT32_MAX) { | |
382 | ACPI_WARNING((AE_INFO, | |
383 | "Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating", | |
384 | ACPI_FORMAT_UINT64(compressed_id))); | |
385 | } | |
386 | ||
1da177e4 LT |
387 | /* Swap ID to big-endian to get contiguous bits */ |
388 | ||
15b8dd53 | 389 | swapped_id = acpi_ut_dword_byte_swap((u32)compressed_id); |
1da177e4 | 390 | |
15b8dd53 BM |
391 | /* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */ |
392 | ||
393 | out_string[0] = | |
394 | (char)(0x40 + (((unsigned long)swapped_id >> 26) & 0x1F)); | |
395 | out_string[1] = (char)(0x40 + ((swapped_id >> 21) & 0x1F)); | |
396 | out_string[2] = (char)(0x40 + ((swapped_id >> 16) & 0x1F)); | |
397 | out_string[3] = acpi_ut_hex_to_ascii_char((acpi_integer)swapped_id, 12); | |
398 | out_string[4] = acpi_ut_hex_to_ascii_char((acpi_integer)swapped_id, 8); | |
399 | out_string[5] = acpi_ut_hex_to_ascii_char((acpi_integer)swapped_id, 4); | |
400 | out_string[6] = acpi_ut_hex_to_ascii_char((acpi_integer)swapped_id, 0); | |
1da177e4 LT |
401 | out_string[7] = 0; |
402 | } | |
403 | ||
1da177e4 LT |
404 | /******************************************************************************* |
405 | * | |
15b8dd53 | 406 | * FUNCTION: acpi_ex_integer_to_string |
1da177e4 | 407 | * |
15b8dd53 BM |
408 | * PARAMETERS: out_string - Where to put the converted string. At least |
409 | * 21 bytes are needed to hold the largest | |
410 | * possible 64-bit integer. | |
411 | * Value - Value to be converted | |
1da177e4 | 412 | * |
44f6c012 RM |
413 | * RETURN: None, string |
414 | * | |
15b8dd53 BM |
415 | * DESCRIPTION: Convert a 64-bit integer to decimal string representation. |
416 | * Assumes string buffer is large enough to hold the string. The | |
417 | * largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1). | |
1da177e4 LT |
418 | * |
419 | ******************************************************************************/ | |
420 | ||
15b8dd53 | 421 | void acpi_ex_integer_to_string(char *out_string, acpi_integer value) |
1da177e4 | 422 | { |
4be44fcd LB |
423 | u32 count; |
424 | u32 digits_needed; | |
425 | u32 remainder; | |
1da177e4 | 426 | |
4be44fcd | 427 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 428 | |
4be44fcd | 429 | digits_needed = acpi_ex_digits_needed(value, 10); |
1da177e4 LT |
430 | out_string[digits_needed] = 0; |
431 | ||
432 | for (count = digits_needed; count > 0; count--) { | |
4be44fcd LB |
433 | (void)acpi_ut_short_divide(value, 10, &value, &remainder); |
434 | out_string[count - 1] = (char)('0' + remainder); | |
1da177e4 LT |
435 | } |
436 | } | |
437 | ||
438 | #endif |