1 /*******************************************************************************
2 *
3 * Module Name: utmisc - common utility procedures
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2012, Intel Corp.
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 "accommon.h"
48 #include "acnamesp.h"
49
50 #define _COMPONENT ACPI_UTILITIES
51 ACPI_MODULE_NAME("utmisc")
52
53 /*******************************************************************************
54 *
55 * FUNCTION: acpi_ut_validate_exception
56 *
57 * PARAMETERS: Status - The acpi_status code to be formatted
58 *
59 * RETURN: A string containing the exception text. NULL if exception is
60 * not valid.
61 *
62 * DESCRIPTION: This function validates and translates an ACPI exception into
63 * an ASCII string.
64 *
65 ******************************************************************************/
acpi_ut_validate_exception(acpi_status status)66 const char *acpi_ut_validate_exception(acpi_status status)
67 {
68 u32 sub_status;
69 const char *exception = NULL;
70
71 ACPI_FUNCTION_ENTRY();
72
73 /*
74 * Status is composed of two parts, a "type" and an actual code
75 */
76 sub_status = (status & ~AE_CODE_MASK);
77
78 switch (status & AE_CODE_MASK) {
79 case AE_CODE_ENVIRONMENTAL:
80
81 if (sub_status <= AE_CODE_ENV_MAX) {
82 exception = acpi_gbl_exception_names_env[sub_status];
83 }
84 break;
85
86 case AE_CODE_PROGRAMMER:
87
88 if (sub_status <= AE_CODE_PGM_MAX) {
89 exception = acpi_gbl_exception_names_pgm[sub_status];
90 }
91 break;
92
93 case AE_CODE_ACPI_TABLES:
94
95 if (sub_status <= AE_CODE_TBL_MAX) {
96 exception = acpi_gbl_exception_names_tbl[sub_status];
97 }
98 break;
99
100 case AE_CODE_AML:
101
102 if (sub_status <= AE_CODE_AML_MAX) {
103 exception = acpi_gbl_exception_names_aml[sub_status];
104 }
105 break;
106
107 case AE_CODE_CONTROL:
108
109 if (sub_status <= AE_CODE_CTRL_MAX) {
110 exception = acpi_gbl_exception_names_ctrl[sub_status];
111 }
112 break;
113
114 default:
115 break;
116 }
117
118 return (ACPI_CAST_PTR(const char, exception));
119 }
120
121 /*******************************************************************************
122 *
123 * FUNCTION: acpi_ut_is_pci_root_bridge
124 *
125 * PARAMETERS: Id - The HID/CID in string format
126 *
127 * RETURN: TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
128 *
129 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
130 *
131 ******************************************************************************/
132
acpi_ut_is_pci_root_bridge(char * id)133 u8 acpi_ut_is_pci_root_bridge(char *id)
134 {
135
136 /*
137 * Check if this is a PCI root bridge.
138 * ACPI 3.0+: check for a PCI Express root also.
139 */
140 if (!(ACPI_STRCMP(id,
141 PCI_ROOT_HID_STRING)) ||
142 !(ACPI_STRCMP(id, PCI_EXPRESS_ROOT_HID_STRING))) {
143 return (TRUE);
144 }
145
146 return (FALSE);
147 }
148
149 /*******************************************************************************
150 *
151 * FUNCTION: acpi_ut_is_aml_table
152 *
153 * PARAMETERS: Table - An ACPI table
154 *
155 * RETURN: TRUE if table contains executable AML; FALSE otherwise
156 *
157 * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
158 * Currently, these are DSDT,SSDT,PSDT. All other table types are
159 * data tables that do not contain AML code.
160 *
161 ******************************************************************************/
162
acpi_ut_is_aml_table(struct acpi_table_header * table)163 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
164 {
165
166 /* These are the only tables that contain executable AML */
167
168 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) ||
169 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_PSDT) ||
170 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
171 return (TRUE);
172 }
173
174 return (FALSE);
175 }
176
177 /*******************************************************************************
178 *
179 * FUNCTION: acpi_ut_allocate_owner_id
180 *
181 * PARAMETERS: owner_id - Where the new owner ID is returned
182 *
183 * RETURN: Status
184 *
185 * DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
186 * track objects created by the table or method, to be deleted
187 * when the method exits or the table is unloaded.
188 *
189 ******************************************************************************/
190
acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)191 acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
192 {
193 u32 i;
194 u32 j;
195 u32 k;
196 acpi_status status;
197
198 ACPI_FUNCTION_TRACE(ut_allocate_owner_id);
199
200 /* Guard against multiple allocations of ID to the same location */
201
202 if (*owner_id) {
203 ACPI_ERROR((AE_INFO, "Owner ID [0x%2.2X] already exists",
204 *owner_id));
205 return_ACPI_STATUS(AE_ALREADY_EXISTS);
206 }
207
208 /* Mutex for the global ID mask */
209
210 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
211 if (ACPI_FAILURE(status)) {
212 return_ACPI_STATUS(status);
213 }
214
215 /*
216 * Find a free owner ID, cycle through all possible IDs on repeated
217 * allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index may have
218 * to be scanned twice.
219 */
220 for (i = 0, j = acpi_gbl_last_owner_id_index;
221 i < (ACPI_NUM_OWNERID_MASKS + 1); i++, j++) {
222 if (j >= ACPI_NUM_OWNERID_MASKS) {
223 j = 0; /* Wraparound to start of mask array */
224 }
225
226 for (k = acpi_gbl_next_owner_id_offset; k < 32; k++) {
227 if (acpi_gbl_owner_id_mask[j] == ACPI_UINT32_MAX) {
228
229 /* There are no free IDs in this mask */
230
231 break;
232 }
233
234 if (!(acpi_gbl_owner_id_mask[j] & (1 << k))) {
235 /*
236 * Found a free ID. The actual ID is the bit index plus one,
237 * making zero an invalid Owner ID. Save this as the last ID
238 * allocated and update the global ID mask.
239 */
240 acpi_gbl_owner_id_mask[j] |= (1 << k);
241
242 acpi_gbl_last_owner_id_index = (u8) j;
243 acpi_gbl_next_owner_id_offset = (u8) (k + 1);
244
245 /*
246 * Construct encoded ID from the index and bit position
247 *
248 * Note: Last [j].k (bit 255) is never used and is marked
249 * permanently allocated (prevents +1 overflow)
250 */
251 *owner_id =
252 (acpi_owner_id) ((k + 1) + ACPI_MUL_32(j));
253
254 ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
255 "Allocated OwnerId: %2.2X\n",
256 (unsigned int)*owner_id));
257 goto exit;
258 }
259 }
260
261 acpi_gbl_next_owner_id_offset = 0;
262 }
263
264 /*
265 * All owner_ids have been allocated. This typically should
266 * not happen since the IDs are reused after deallocation. The IDs are
267 * allocated upon table load (one per table) and method execution, and
268 * they are released when a table is unloaded or a method completes
269 * execution.
270 *
271 * If this error happens, there may be very deep nesting of invoked control
272 * methods, or there may be a bug where the IDs are not released.
273 */
274 status = AE_OWNER_ID_LIMIT;
275 ACPI_ERROR((AE_INFO,
276 "Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
277
278 exit:
279 (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
280 return_ACPI_STATUS(status);
281 }
282
283 /*******************************************************************************
284 *
285 * FUNCTION: acpi_ut_release_owner_id
286 *
287 * PARAMETERS: owner_id_ptr - Pointer to a previously allocated owner_iD
288 *
289 * RETURN: None. No error is returned because we are either exiting a
290 * control method or unloading a table. Either way, we would
291 * ignore any error anyway.
292 *
293 * DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
294 *
295 ******************************************************************************/
296
acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)297 void acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)
298 {
299 acpi_owner_id owner_id = *owner_id_ptr;
300 acpi_status status;
301 u32 index;
302 u32 bit;
303
304 ACPI_FUNCTION_TRACE_U32(ut_release_owner_id, owner_id);
305
306 /* Always clear the input owner_id (zero is an invalid ID) */
307
308 *owner_id_ptr = 0;
309
310 /* Zero is not a valid owner_iD */
311
312 if (owner_id == 0) {
313 ACPI_ERROR((AE_INFO, "Invalid OwnerId: 0x%2.2X", owner_id));
314 return_VOID;
315 }
316
317 /* Mutex for the global ID mask */
318
319 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
320 if (ACPI_FAILURE(status)) {
321 return_VOID;
322 }
323
324 /* Normalize the ID to zero */
325
326 owner_id--;
327
328 /* Decode ID to index/offset pair */
329
330 index = ACPI_DIV_32(owner_id);
331 bit = 1 << ACPI_MOD_32(owner_id);
332
333 /* Free the owner ID only if it is valid */
334
335 if (acpi_gbl_owner_id_mask[index] & bit) {
336 acpi_gbl_owner_id_mask[index] ^= bit;
337 } else {
338 ACPI_ERROR((AE_INFO,
339 "Release of non-allocated OwnerId: 0x%2.2X",
340 owner_id + 1));
341 }
342
343 (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
344 return_VOID;
345 }
346
347 /*******************************************************************************
348 *
349 * FUNCTION: acpi_ut_strupr (strupr)
350 *
351 * PARAMETERS: src_string - The source string to convert
352 *
353 * RETURN: None
354 *
355 * DESCRIPTION: Convert string to uppercase
356 *
357 * NOTE: This is not a POSIX function, so it appears here, not in utclib.c
358 *
359 ******************************************************************************/
360
acpi_ut_strupr(char * src_string)361 void acpi_ut_strupr(char *src_string)
362 {
363 char *string;
364
365 ACPI_FUNCTION_ENTRY();
366
367 if (!src_string) {
368 return;
369 }
370
371 /* Walk entire string, uppercasing the letters */
372
373 for (string = src_string; *string; string++) {
374 *string = (char)ACPI_TOUPPER(*string);
375 }
376
377 return;
378 }
379
380 /*******************************************************************************
381 *
382 * FUNCTION: acpi_ut_print_string
383 *
384 * PARAMETERS: String - Null terminated ASCII string
385 * max_length - Maximum output length
386 *
387 * RETURN: None
388 *
389 * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
390 * sequences.
391 *
392 ******************************************************************************/
393
acpi_ut_print_string(char * string,u8 max_length)394 void acpi_ut_print_string(char *string, u8 max_length)
395 {
396 u32 i;
397
398 if (!string) {
399 acpi_os_printf("<\"NULL STRING PTR\">");
400 return;
401 }
402
403 acpi_os_printf("\"");
404 for (i = 0; string[i] && (i < max_length); i++) {
405
406 /* Escape sequences */
407
408 switch (string[i]) {
409 case 0x07:
410 acpi_os_printf("\\a"); /* BELL */
411 break;
412
413 case 0x08:
414 acpi_os_printf("\\b"); /* BACKSPACE */
415 break;
416
417 case 0x0C:
418 acpi_os_printf("\\f"); /* FORMFEED */
419 break;
420
421 case 0x0A:
422 acpi_os_printf("\\n"); /* LINEFEED */
423 break;
424
425 case 0x0D:
426 acpi_os_printf("\\r"); /* CARRIAGE RETURN */
427 break;
428
429 case 0x09:
430 acpi_os_printf("\\t"); /* HORIZONTAL TAB */
431 break;
432
433 case 0x0B:
434 acpi_os_printf("\\v"); /* VERTICAL TAB */
435 break;
436
437 case '\'': /* Single Quote */
438 case '\"': /* Double Quote */
439 case '\\': /* Backslash */
440 acpi_os_printf("\\%c", (int)string[i]);
441 break;
442
443 default:
444
445 /* Check for printable character or hex escape */
446
447 if (ACPI_IS_PRINT(string[i])) {
448 /* This is a normal character */
449
450 acpi_os_printf("%c", (int)string[i]);
451 } else {
452 /* All others will be Hex escapes */
453
454 acpi_os_printf("\\x%2.2X", (s32) string[i]);
455 }
456 break;
457 }
458 }
459 acpi_os_printf("\"");
460
461 if (i == max_length && string[i]) {
462 acpi_os_printf("...");
463 }
464 }
465
466 /*******************************************************************************
467 *
468 * FUNCTION: acpi_ut_dword_byte_swap
469 *
470 * PARAMETERS: Value - Value to be converted
471 *
472 * RETURN: u32 integer with bytes swapped
473 *
474 * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
475 *
476 ******************************************************************************/
477
acpi_ut_dword_byte_swap(u32 value)478 u32 acpi_ut_dword_byte_swap(u32 value)
479 {
480 union {
481 u32 value;
482 u8 bytes[4];
483 } out;
484 union {
485 u32 value;
486 u8 bytes[4];
487 } in;
488
489 ACPI_FUNCTION_ENTRY();
490
491 in.value = value;
492
493 out.bytes[0] = in.bytes[3];
494 out.bytes[1] = in.bytes[2];
495 out.bytes[2] = in.bytes[1];
496 out.bytes[3] = in.bytes[0];
497
498 return (out.value);
499 }
500
501 /*******************************************************************************
502 *
503 * FUNCTION: acpi_ut_set_integer_width
504 *
505 * PARAMETERS: Revision From DSDT header
506 *
507 * RETURN: None
508 *
509 * DESCRIPTION: Set the global integer bit width based upon the revision
510 * of the DSDT. For Revision 1 and 0, Integers are 32 bits.
511 * For Revision 2 and above, Integers are 64 bits. Yes, this
512 * makes a difference.
513 *
514 ******************************************************************************/
515
acpi_ut_set_integer_width(u8 revision)516 void acpi_ut_set_integer_width(u8 revision)
517 {
518
519 if (revision < 2) {
520
521 /* 32-bit case */
522
523 acpi_gbl_integer_bit_width = 32;
524 acpi_gbl_integer_nybble_width = 8;
525 acpi_gbl_integer_byte_width = 4;
526 } else {
527 /* 64-bit case (ACPI 2.0+) */
528
529 acpi_gbl_integer_bit_width = 64;
530 acpi_gbl_integer_nybble_width = 16;
531 acpi_gbl_integer_byte_width = 8;
532 }
533 }
534
535 #ifdef ACPI_DEBUG_OUTPUT
536 /*******************************************************************************
537 *
538 * FUNCTION: acpi_ut_display_init_pathname
539 *
540 * PARAMETERS: Type - Object type of the node
541 * obj_handle - Handle whose pathname will be displayed
542 * Path - Additional path string to be appended.
543 * (NULL if no extra path)
544 *
545 * RETURN: acpi_status
546 *
547 * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
548 *
549 ******************************************************************************/
550
551 void
acpi_ut_display_init_pathname(u8 type,struct acpi_namespace_node * obj_handle,char * path)552 acpi_ut_display_init_pathname(u8 type,
553 struct acpi_namespace_node *obj_handle,
554 char *path)
555 {
556 acpi_status status;
557 struct acpi_buffer buffer;
558
559 ACPI_FUNCTION_ENTRY();
560
561 /* Only print the path if the appropriate debug level is enabled */
562
563 if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
564 return;
565 }
566
567 /* Get the full pathname to the node */
568
569 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
570 status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
571 if (ACPI_FAILURE(status)) {
572 return;
573 }
574
575 /* Print what we're doing */
576
577 switch (type) {
578 case ACPI_TYPE_METHOD:
579 acpi_os_printf("Executing ");
580 break;
581
582 default:
583 acpi_os_printf("Initializing ");
584 break;
585 }
586
587 /* Print the object type and pathname */
588
589 acpi_os_printf("%-12s %s",
590 acpi_ut_get_type_name(type), (char *)buffer.pointer);
591
592 /* Extra path is used to append names like _STA, _INI, etc. */
593
594 if (path) {
595 acpi_os_printf(".%s", path);
596 }
597 acpi_os_printf("\n");
598
599 ACPI_FREE(buffer.pointer);
600 }
601 #endif
602
603 /*******************************************************************************
604 *
605 * FUNCTION: acpi_ut_valid_acpi_char
606 *
607 * PARAMETERS: Char - The character to be examined
608 * Position - Byte position (0-3)
609 *
610 * RETURN: TRUE if the character is valid, FALSE otherwise
611 *
612 * DESCRIPTION: Check for a valid ACPI character. Must be one of:
613 * 1) Upper case alpha
614 * 2) numeric
615 * 3) underscore
616 *
617 * We allow a '!' as the last character because of the ASF! table
618 *
619 ******************************************************************************/
620
acpi_ut_valid_acpi_char(char character,u32 position)621 u8 acpi_ut_valid_acpi_char(char character, u32 position)
622 {
623
624 if (!((character >= 'A' && character <= 'Z') ||
625 (character >= '0' && character <= '9') || (character == '_'))) {
626
627 /* Allow a '!' in the last position */
628
629 if (character == '!' && position == 3) {
630 return (TRUE);
631 }
632
633 return (FALSE);
634 }
635
636 return (TRUE);
637 }
638
639 /*******************************************************************************
640 *
641 * FUNCTION: acpi_ut_valid_acpi_name
642 *
643 * PARAMETERS: Name - The name to be examined
644 *
645 * RETURN: TRUE if the name is valid, FALSE otherwise
646 *
647 * DESCRIPTION: Check for a valid ACPI name. Each character must be one of:
648 * 1) Upper case alpha
649 * 2) numeric
650 * 3) underscore
651 *
652 ******************************************************************************/
653
acpi_ut_valid_acpi_name(u32 name)654 u8 acpi_ut_valid_acpi_name(u32 name)
655 {
656 u32 i;
657
658 ACPI_FUNCTION_ENTRY();
659
660 for (i = 0; i < ACPI_NAME_SIZE; i++) {
661 if (!acpi_ut_valid_acpi_char
662 ((ACPI_CAST_PTR(char, &name))[i], i)) {
663 return (FALSE);
664 }
665 }
666
667 return (TRUE);
668 }
669
670 /*******************************************************************************
671 *
672 * FUNCTION: acpi_ut_repair_name
673 *
674 * PARAMETERS: Name - The ACPI name to be repaired
675 *
676 * RETURN: Repaired version of the name
677 *
678 * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
679 * return the new name.
680 *
681 ******************************************************************************/
682
acpi_ut_repair_name(char * name)683 acpi_name acpi_ut_repair_name(char *name)
684 {
685 u32 i;
686 char new_name[ACPI_NAME_SIZE];
687
688 for (i = 0; i < ACPI_NAME_SIZE; i++) {
689 new_name[i] = name[i];
690
691 /*
692 * Replace a bad character with something printable, yet technically
693 * still invalid. This prevents any collisions with existing "good"
694 * names in the namespace.
695 */
696 if (!acpi_ut_valid_acpi_char(name[i], i)) {
697 new_name[i] = '*';
698 }
699 }
700
701 return (*(u32 *) new_name);
702 }
703
704 /*******************************************************************************
705 *
706 * FUNCTION: acpi_ut_strtoul64
707 *
708 * PARAMETERS: String - Null terminated string
709 * Base - Radix of the string: 16 or ACPI_ANY_BASE;
710 * ACPI_ANY_BASE means 'in behalf of to_integer'
711 * ret_integer - Where the converted integer is returned
712 *
713 * RETURN: Status and Converted value
714 *
715 * DESCRIPTION: Convert a string into an unsigned value. Performs either a
716 * 32-bit or 64-bit conversion, depending on the current mode
717 * of the interpreter.
718 * NOTE: Does not support Octal strings, not needed.
719 *
720 ******************************************************************************/
721
acpi_ut_strtoul64(char * string,u32 base,u64 * ret_integer)722 acpi_status acpi_ut_strtoul64(char *string, u32 base, u64 * ret_integer)
723 {
724 u32 this_digit = 0;
725 u64 return_value = 0;
726 u64 quotient;
727 u64 dividend;
728 u32 to_integer_op = (base == ACPI_ANY_BASE);
729 u32 mode32 = (acpi_gbl_integer_byte_width == 4);
730 u8 valid_digits = 0;
731 u8 sign_of0x = 0;
732 u8 term = 0;
733
734 ACPI_FUNCTION_TRACE_STR(ut_stroul64, string);
735
736 switch (base) {
737 case ACPI_ANY_BASE:
738 case 16:
739 break;
740
741 default:
742 /* Invalid Base */
743 return_ACPI_STATUS(AE_BAD_PARAMETER);
744 }
745
746 if (!string) {
747 goto error_exit;
748 }
749
750 /* Skip over any white space in the buffer */
751
752 while ((*string) && (ACPI_IS_SPACE(*string) || *string == '\t')) {
753 string++;
754 }
755
756 if (to_integer_op) {
757 /*
758 * Base equal to ACPI_ANY_BASE means 'to_integer operation case'.
759 * We need to determine if it is decimal or hexadecimal.
760 */
761 if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
762 sign_of0x = 1;
763 base = 16;
764
765 /* Skip over the leading '0x' */
766 string += 2;
767 } else {
768 base = 10;
769 }
770 }
771
772 /* Any string left? Check that '0x' is not followed by white space. */
773
774 if (!(*string) || ACPI_IS_SPACE(*string) || *string == '\t') {
775 if (to_integer_op) {
776 goto error_exit;
777 } else {
778 goto all_done;
779 }
780 }
781
782 /*
783 * Perform a 32-bit or 64-bit conversion, depending upon the current
784 * execution mode of the interpreter
785 */
786 dividend = (mode32) ? ACPI_UINT32_MAX : ACPI_UINT64_MAX;
787
788 /* Main loop: convert the string to a 32- or 64-bit integer */
789
790 while (*string) {
791 if (ACPI_IS_DIGIT(*string)) {
792
793 /* Convert ASCII 0-9 to Decimal value */
794
795 this_digit = ((u8) * string) - '0';
796 } else if (base == 10) {
797
798 /* Digit is out of range; possible in to_integer case only */
799
800 term = 1;
801 } else {
802 this_digit = (u8) ACPI_TOUPPER(*string);
803 if (ACPI_IS_XDIGIT((char)this_digit)) {
804
805 /* Convert ASCII Hex char to value */
806
807 this_digit = this_digit - 'A' + 10;
808 } else {
809 term = 1;
810 }
811 }
812
813 if (term) {
814 if (to_integer_op) {
815 goto error_exit;
816 } else {
817 break;
818 }
819 } else if ((valid_digits == 0) && (this_digit == 0)
820 && !sign_of0x) {
821
822 /* Skip zeros */
823 string++;
824 continue;
825 }
826
827 valid_digits++;
828
829 if (sign_of0x && ((valid_digits > 16)
830 || ((valid_digits > 8) && mode32))) {
831 /*
832 * This is to_integer operation case.
833 * No any restrictions for string-to-integer conversion,
834 * see ACPI spec.
835 */
836 goto error_exit;
837 }
838
839 /* Divide the digit into the correct position */
840
841 (void)acpi_ut_short_divide((dividend - (u64) this_digit),
842 base, "ient, NULL);
843
844 if (return_value > quotient) {
845 if (to_integer_op) {
846 goto error_exit;
847 } else {
848 break;
849 }
850 }
851
852 return_value *= base;
853 return_value += this_digit;
854 string++;
855 }
856
857 /* All done, normal exit */
858
859 all_done:
860
861 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
862 ACPI_FORMAT_UINT64(return_value)));
863
864 *ret_integer = return_value;
865 return_ACPI_STATUS(AE_OK);
866
867 error_exit:
868 /* Base was set/validated above */
869
870 if (base == 10) {
871 return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
872 } else {
873 return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
874 }
875 }
876
877 /*******************************************************************************
878 *
879 * FUNCTION: acpi_ut_create_update_state_and_push
880 *
881 * PARAMETERS: Object - Object to be added to the new state
882 * Action - Increment/Decrement
883 * state_list - List the state will be added to
884 *
885 * RETURN: Status
886 *
887 * DESCRIPTION: Create a new state and push it
888 *
889 ******************************************************************************/
890
891 acpi_status
acpi_ut_create_update_state_and_push(union acpi_operand_object * object,u16 action,union acpi_generic_state ** state_list)892 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
893 u16 action,
894 union acpi_generic_state **state_list)
895 {
896 union acpi_generic_state *state;
897
898 ACPI_FUNCTION_ENTRY();
899
900 /* Ignore null objects; these are expected */
901
902 if (!object) {
903 return (AE_OK);
904 }
905
906 state = acpi_ut_create_update_state(object, action);
907 if (!state) {
908 return (AE_NO_MEMORY);
909 }
910
911 acpi_ut_push_generic_state(state_list, state);
912 return (AE_OK);
913 }
914
915 /*******************************************************************************
916 *
917 * FUNCTION: acpi_ut_walk_package_tree
918 *
919 * PARAMETERS: source_object - The package to walk
920 * target_object - Target object (if package is being copied)
921 * walk_callback - Called once for each package element
922 * Context - Passed to the callback function
923 *
924 * RETURN: Status
925 *
926 * DESCRIPTION: Walk through a package
927 *
928 ******************************************************************************/
929
930 acpi_status
acpi_ut_walk_package_tree(union acpi_operand_object * source_object,void * target_object,acpi_pkg_callback walk_callback,void * context)931 acpi_ut_walk_package_tree(union acpi_operand_object * source_object,
932 void *target_object,
933 acpi_pkg_callback walk_callback, void *context)
934 {
935 acpi_status status = AE_OK;
936 union acpi_generic_state *state_list = NULL;
937 union acpi_generic_state *state;
938 u32 this_index;
939 union acpi_operand_object *this_source_obj;
940
941 ACPI_FUNCTION_TRACE(ut_walk_package_tree);
942
943 state = acpi_ut_create_pkg_state(source_object, target_object, 0);
944 if (!state) {
945 return_ACPI_STATUS(AE_NO_MEMORY);
946 }
947
948 while (state) {
949
950 /* Get one element of the package */
951
952 this_index = state->pkg.index;
953 this_source_obj = (union acpi_operand_object *)
954 state->pkg.source_object->package.elements[this_index];
955
956 /*
957 * Check for:
958 * 1) An uninitialized package element. It is completely
959 * legal to declare a package and leave it uninitialized
960 * 2) Not an internal object - can be a namespace node instead
961 * 3) Any type other than a package. Packages are handled in else
962 * case below.
963 */
964 if ((!this_source_obj) ||
965 (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
966 ACPI_DESC_TYPE_OPERAND)
967 || (this_source_obj->common.type != ACPI_TYPE_PACKAGE)) {
968 status =
969 walk_callback(ACPI_COPY_TYPE_SIMPLE,
970 this_source_obj, state, context);
971 if (ACPI_FAILURE(status)) {
972 return_ACPI_STATUS(status);
973 }
974
975 state->pkg.index++;
976 while (state->pkg.index >=
977 state->pkg.source_object->package.count) {
978 /*
979 * We've handled all of the objects at this level, This means
980 * that we have just completed a package. That package may
981 * have contained one or more packages itself.
982 *
983 * Delete this state and pop the previous state (package).
984 */
985 acpi_ut_delete_generic_state(state);
986 state = acpi_ut_pop_generic_state(&state_list);
987
988 /* Finished when there are no more states */
989
990 if (!state) {
991 /*
992 * We have handled all of the objects in the top level
993 * package just add the length of the package objects
994 * and exit
995 */
996 return_ACPI_STATUS(AE_OK);
997 }
998
999 /*
1000 * Go back up a level and move the index past the just
1001 * completed package object.
1002 */
1003 state->pkg.index++;
1004 }
1005 } else {
1006 /* This is a subobject of type package */
1007
1008 status =
1009 walk_callback(ACPI_COPY_TYPE_PACKAGE,
1010 this_source_obj, state, context);
1011 if (ACPI_FAILURE(status)) {
1012 return_ACPI_STATUS(status);
1013 }
1014
1015 /*
1016 * Push the current state and create a new one
1017 * The callback above returned a new target package object.
1018 */
1019 acpi_ut_push_generic_state(&state_list, state);
1020 state = acpi_ut_create_pkg_state(this_source_obj,
1021 state->pkg.
1022 this_target_obj, 0);
1023 if (!state) {
1024
1025 /* Free any stacked Update State objects */
1026
1027 while (state_list) {
1028 state =
1029 acpi_ut_pop_generic_state
1030 (&state_list);
1031 acpi_ut_delete_generic_state(state);
1032 }
1033 return_ACPI_STATUS(AE_NO_MEMORY);
1034 }
1035 }
1036 }
1037
1038 /* We should never get here */
1039
1040 return_ACPI_STATUS(AE_AML_INTERNAL);
1041 }
1042