1 /*******************************************************************************
3 * Module Name: utmisc - common utility procedures
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2011, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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
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44 #include <linux/module.h>
46 #include <acpi/acpi.h>
50 #define _COMPONENT ACPI_UTILITIES
51 ACPI_MODULE_NAME("utmisc")
53 /*******************************************************************************
55 * FUNCTION: acpi_ut_validate_exception
57 * PARAMETERS: Status - The acpi_status code to be formatted
59 * RETURN: A string containing the exception text. NULL if exception is
62 * DESCRIPTION: This function validates and translates an ACPI exception into
65 ******************************************************************************/
66 const char *acpi_ut_validate_exception(acpi_status status)
69 const char *exception = NULL;
71 ACPI_FUNCTION_ENTRY();
74 * Status is composed of two parts, a "type" and an actual code
76 sub_status = (status & ~AE_CODE_MASK);
78 switch (status & AE_CODE_MASK) {
79 case AE_CODE_ENVIRONMENTAL:
81 if (sub_status <= AE_CODE_ENV_MAX) {
82 exception = acpi_gbl_exception_names_env[sub_status];
86 case AE_CODE_PROGRAMMER:
88 if (sub_status <= AE_CODE_PGM_MAX) {
89 exception = acpi_gbl_exception_names_pgm[sub_status];
93 case AE_CODE_ACPI_TABLES:
95 if (sub_status <= AE_CODE_TBL_MAX) {
96 exception = acpi_gbl_exception_names_tbl[sub_status];
102 if (sub_status <= AE_CODE_AML_MAX) {
103 exception = acpi_gbl_exception_names_aml[sub_status];
107 case AE_CODE_CONTROL:
109 if (sub_status <= AE_CODE_CTRL_MAX) {
110 exception = acpi_gbl_exception_names_ctrl[sub_status];
118 return (ACPI_CAST_PTR(const char, exception));
121 /*******************************************************************************
123 * FUNCTION: acpi_ut_is_pci_root_bridge
125 * PARAMETERS: Id - The HID/CID in string format
127 * RETURN: TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
129 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
131 ******************************************************************************/
133 u8 acpi_ut_is_pci_root_bridge(char *id)
137 * Check if this is a PCI root bridge.
138 * ACPI 3.0+: check for a PCI Express root also.
140 if (!(ACPI_STRCMP(id,
141 PCI_ROOT_HID_STRING)) ||
142 !(ACPI_STRCMP(id, PCI_EXPRESS_ROOT_HID_STRING))) {
149 /*******************************************************************************
151 * FUNCTION: acpi_ut_is_aml_table
153 * PARAMETERS: Table - An ACPI table
155 * RETURN: TRUE if table contains executable AML; FALSE otherwise
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.
161 ******************************************************************************/
163 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
166 /* These are the only tables that contain executable AML */
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)) {
177 /*******************************************************************************
179 * FUNCTION: acpi_ut_allocate_owner_id
181 * PARAMETERS: owner_id - Where the new owner ID is returned
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.
189 ******************************************************************************/
191 acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
198 ACPI_FUNCTION_TRACE(ut_allocate_owner_id);
200 /* Guard against multiple allocations of ID to the same location */
203 ACPI_ERROR((AE_INFO, "Owner ID [0x%2.2X] already exists",
205 return_ACPI_STATUS(AE_ALREADY_EXISTS);
208 /* Mutex for the global ID mask */
210 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
211 if (ACPI_FAILURE(status)) {
212 return_ACPI_STATUS(status);
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.
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 */
226 for (k = acpi_gbl_next_owner_id_offset; k < 32; k++) {
227 if (acpi_gbl_owner_id_mask[j] == ACPI_UINT32_MAX) {
229 /* There are no free IDs in this mask */
234 if (!(acpi_gbl_owner_id_mask[j] & (1 << k))) {
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.
240 acpi_gbl_owner_id_mask[j] |= (1 << k);
242 acpi_gbl_last_owner_id_index = (u8) j;
243 acpi_gbl_next_owner_id_offset = (u8) (k + 1);
246 * Construct encoded ID from the index and bit position
248 * Note: Last [j].k (bit 255) is never used and is marked
249 * permanently allocated (prevents +1 overflow)
252 (acpi_owner_id) ((k + 1) + ACPI_MUL_32(j));
254 ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
255 "Allocated OwnerId: %2.2X\n",
256 (unsigned int)*owner_id));
261 acpi_gbl_next_owner_id_offset = 0;
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
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.
274 status = AE_OWNER_ID_LIMIT;
276 "Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
279 (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
280 return_ACPI_STATUS(status);
283 /*******************************************************************************
285 * FUNCTION: acpi_ut_release_owner_id
287 * PARAMETERS: owner_id_ptr - Pointer to a previously allocated owner_iD
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.
293 * DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
295 ******************************************************************************/
297 void acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)
299 acpi_owner_id owner_id = *owner_id_ptr;
304 ACPI_FUNCTION_TRACE_U32(ut_release_owner_id, owner_id);
306 /* Always clear the input owner_id (zero is an invalid ID) */
310 /* Zero is not a valid owner_iD */
313 ACPI_ERROR((AE_INFO, "Invalid OwnerId: 0x%2.2X", owner_id));
317 /* Mutex for the global ID mask */
319 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
320 if (ACPI_FAILURE(status)) {
324 /* Normalize the ID to zero */
328 /* Decode ID to index/offset pair */
330 index = ACPI_DIV_32(owner_id);
331 bit = 1 << ACPI_MOD_32(owner_id);
333 /* Free the owner ID only if it is valid */
335 if (acpi_gbl_owner_id_mask[index] & bit) {
336 acpi_gbl_owner_id_mask[index] ^= bit;
339 "Release of non-allocated OwnerId: 0x%2.2X",
343 (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
347 /*******************************************************************************
349 * FUNCTION: acpi_ut_strupr (strupr)
351 * PARAMETERS: src_string - The source string to convert
355 * DESCRIPTION: Convert string to uppercase
357 * NOTE: This is not a POSIX function, so it appears here, not in utclib.c
359 ******************************************************************************/
361 void acpi_ut_strupr(char *src_string)
365 ACPI_FUNCTION_ENTRY();
371 /* Walk entire string, uppercasing the letters */
373 for (string = src_string; *string; string++) {
374 *string = (char)ACPI_TOUPPER(*string);
380 /*******************************************************************************
382 * FUNCTION: acpi_ut_print_string
384 * PARAMETERS: String - Null terminated ASCII string
385 * max_length - Maximum output length
389 * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
392 ******************************************************************************/
394 void acpi_ut_print_string(char *string, u8 max_length)
399 acpi_os_printf("<\"NULL STRING PTR\">");
403 acpi_os_printf("\"");
404 for (i = 0; string[i] && (i < max_length); i++) {
406 /* Escape sequences */
410 acpi_os_printf("\\a"); /* BELL */
414 acpi_os_printf("\\b"); /* BACKSPACE */
418 acpi_os_printf("\\f"); /* FORMFEED */
422 acpi_os_printf("\\n"); /* LINEFEED */
426 acpi_os_printf("\\r"); /* CARRIAGE RETURN */
430 acpi_os_printf("\\t"); /* HORIZONTAL TAB */
434 acpi_os_printf("\\v"); /* VERTICAL TAB */
437 case '\'': /* Single Quote */
438 case '\"': /* Double Quote */
439 case '\\': /* Backslash */
440 acpi_os_printf("\\%c", (int)string[i]);
445 /* Check for printable character or hex escape */
447 if (ACPI_IS_PRINT(string[i])) {
448 /* This is a normal character */
450 acpi_os_printf("%c", (int)string[i]);
452 /* All others will be Hex escapes */
454 acpi_os_printf("\\x%2.2X", (s32) string[i]);
459 acpi_os_printf("\"");
461 if (i == max_length && string[i]) {
462 acpi_os_printf("...");
466 /*******************************************************************************
468 * FUNCTION: acpi_ut_dword_byte_swap
470 * PARAMETERS: Value - Value to be converted
472 * RETURN: u32 integer with bytes swapped
474 * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
476 ******************************************************************************/
478 u32 acpi_ut_dword_byte_swap(u32 value)
489 ACPI_FUNCTION_ENTRY();
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];
501 /*******************************************************************************
503 * FUNCTION: acpi_ut_set_integer_width
505 * PARAMETERS: Revision From DSDT header
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.
514 ******************************************************************************/
516 void acpi_ut_set_integer_width(u8 revision)
523 acpi_gbl_integer_bit_width = 32;
524 acpi_gbl_integer_nybble_width = 8;
525 acpi_gbl_integer_byte_width = 4;
527 /* 64-bit case (ACPI 2.0+) */
529 acpi_gbl_integer_bit_width = 64;
530 acpi_gbl_integer_nybble_width = 16;
531 acpi_gbl_integer_byte_width = 8;
535 #ifdef ACPI_DEBUG_OUTPUT
536 /*******************************************************************************
538 * FUNCTION: acpi_ut_display_init_pathname
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)
545 * RETURN: acpi_status
547 * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
549 ******************************************************************************/
552 acpi_ut_display_init_pathname(u8 type,
553 struct acpi_namespace_node *obj_handle,
557 struct acpi_buffer buffer;
559 ACPI_FUNCTION_ENTRY();
561 /* Only print the path if the appropriate debug level is enabled */
563 if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
567 /* Get the full pathname to the node */
569 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
570 status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
571 if (ACPI_FAILURE(status)) {
575 /* Print what we're doing */
578 case ACPI_TYPE_METHOD:
579 acpi_os_printf("Executing ");
583 acpi_os_printf("Initializing ");
587 /* Print the object type and pathname */
589 acpi_os_printf("%-12s %s",
590 acpi_ut_get_type_name(type), (char *)buffer.pointer);
592 /* Extra path is used to append names like _STA, _INI, etc. */
595 acpi_os_printf(".%s", path);
597 acpi_os_printf("\n");
599 ACPI_FREE(buffer.pointer);
603 /*******************************************************************************
605 * FUNCTION: acpi_ut_valid_acpi_char
607 * PARAMETERS: Char - The character to be examined
608 * Position - Byte position (0-3)
610 * RETURN: TRUE if the character is valid, FALSE otherwise
612 * DESCRIPTION: Check for a valid ACPI character. Must be one of:
613 * 1) Upper case alpha
617 * We allow a '!' as the last character because of the ASF! table
619 ******************************************************************************/
621 u8 acpi_ut_valid_acpi_char(char character, u32 position)
624 if (!((character >= 'A' && character <= 'Z') ||
625 (character >= '0' && character <= '9') || (character == '_'))) {
627 /* Allow a '!' in the last position */
629 if (character == '!' && position == 3) {
639 /*******************************************************************************
641 * FUNCTION: acpi_ut_valid_acpi_name
643 * PARAMETERS: Name - The name to be examined
645 * RETURN: TRUE if the name is valid, FALSE otherwise
647 * DESCRIPTION: Check for a valid ACPI name. Each character must be one of:
648 * 1) Upper case alpha
652 ******************************************************************************/
654 u8 acpi_ut_valid_acpi_name(u32 name)
658 ACPI_FUNCTION_ENTRY();
660 for (i = 0; i < ACPI_NAME_SIZE; i++) {
661 if (!acpi_ut_valid_acpi_char
662 ((ACPI_CAST_PTR(char, &name))[i], i)) {
670 /*******************************************************************************
672 * FUNCTION: acpi_ut_repair_name
674 * PARAMETERS: Name - The ACPI name to be repaired
676 * RETURN: Repaired version of the name
678 * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
679 * return the new name.
681 ******************************************************************************/
683 acpi_name acpi_ut_repair_name(char *name)
686 char new_name[ACPI_NAME_SIZE];
688 for (i = 0; i < ACPI_NAME_SIZE; i++) {
689 new_name[i] = name[i];
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.
696 if (!acpi_ut_valid_acpi_char(name[i], i)) {
701 return (*(u32 *) new_name);
704 /*******************************************************************************
706 * FUNCTION: acpi_ut_strtoul64
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
713 * RETURN: Status and Converted value
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.
720 ******************************************************************************/
722 acpi_status acpi_ut_strtoul64(char *string, u32 base, u64 * ret_integer)
725 u64 return_value = 0;
728 u32 to_integer_op = (base == ACPI_ANY_BASE);
729 u32 mode32 = (acpi_gbl_integer_byte_width == 4);
734 ACPI_FUNCTION_TRACE_STR(ut_stroul64, string);
743 return_ACPI_STATUS(AE_BAD_PARAMETER);
750 /* Skip over any white space in the buffer */
752 while ((*string) && (ACPI_IS_SPACE(*string) || *string == '\t')) {
758 * Base equal to ACPI_ANY_BASE means 'to_integer operation case'.
759 * We need to determine if it is decimal or hexadecimal.
761 if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
765 /* Skip over the leading '0x' */
772 /* Any string left? Check that '0x' is not followed by white space. */
774 if (!(*string) || ACPI_IS_SPACE(*string) || *string == '\t') {
783 * Perform a 32-bit or 64-bit conversion, depending upon the current
784 * execution mode of the interpreter
786 dividend = (mode32) ? ACPI_UINT32_MAX : ACPI_UINT64_MAX;
788 /* Main loop: convert the string to a 32- or 64-bit integer */
791 if (ACPI_IS_DIGIT(*string)) {
793 /* Convert ASCII 0-9 to Decimal value */
795 this_digit = ((u8) * string) - '0';
796 } else if (base == 10) {
798 /* Digit is out of range; possible in to_integer case only */
802 this_digit = (u8) ACPI_TOUPPER(*string);
803 if (ACPI_IS_XDIGIT((char)this_digit)) {
805 /* Convert ASCII Hex char to value */
807 this_digit = this_digit - 'A' + 10;
819 } else if ((valid_digits == 0) && (this_digit == 0)
829 if (sign_of0x && ((valid_digits > 16)
830 || ((valid_digits > 8) && mode32))) {
832 * This is to_integer operation case.
833 * No any restrictions for string-to-integer conversion,
839 /* Divide the digit into the correct position */
841 (void)acpi_ut_short_divide((dividend - (u64) this_digit),
842 base, "ient, NULL);
844 if (return_value > quotient) {
852 return_value *= base;
853 return_value += this_digit;
857 /* All done, normal exit */
861 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
862 ACPI_FORMAT_UINT64(return_value)));
864 *ret_integer = return_value;
865 return_ACPI_STATUS(AE_OK);
868 /* Base was set/validated above */
871 return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
873 return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
877 /*******************************************************************************
879 * FUNCTION: acpi_ut_create_update_state_and_push
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
887 * DESCRIPTION: Create a new state and push it
889 ******************************************************************************/
892 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
894 union acpi_generic_state **state_list)
896 union acpi_generic_state *state;
898 ACPI_FUNCTION_ENTRY();
900 /* Ignore null objects; these are expected */
906 state = acpi_ut_create_update_state(object, action);
908 return (AE_NO_MEMORY);
911 acpi_ut_push_generic_state(state_list, state);
915 /*******************************************************************************
917 * FUNCTION: acpi_ut_walk_package_tree
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
926 * DESCRIPTION: Walk through a package
928 ******************************************************************************/
931 acpi_ut_walk_package_tree(union acpi_operand_object * source_object,
933 acpi_pkg_callback walk_callback, void *context)
935 acpi_status status = AE_OK;
936 union acpi_generic_state *state_list = NULL;
937 union acpi_generic_state *state;
939 union acpi_operand_object *this_source_obj;
941 ACPI_FUNCTION_TRACE(ut_walk_package_tree);
943 state = acpi_ut_create_pkg_state(source_object, target_object, 0);
945 return_ACPI_STATUS(AE_NO_MEMORY);
950 /* Get one element of the package */
952 this_index = state->pkg.index;
953 this_source_obj = (union acpi_operand_object *)
954 state->pkg.source_object->package.elements[this_index];
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
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)) {
969 walk_callback(ACPI_COPY_TYPE_SIMPLE,
970 this_source_obj, state, context);
971 if (ACPI_FAILURE(status)) {
972 return_ACPI_STATUS(status);
976 while (state->pkg.index >=
977 state->pkg.source_object->package.count) {
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.
983 * Delete this state and pop the previous state (package).
985 acpi_ut_delete_generic_state(state);
986 state = acpi_ut_pop_generic_state(&state_list);
988 /* Finished when there are no more states */
992 * We have handled all of the objects in the top level
993 * package just add the length of the package objects
996 return_ACPI_STATUS(AE_OK);
1000 * Go back up a level and move the index past the just
1001 * completed package object.
1006 /* This is a subobject of type package */
1009 walk_callback(ACPI_COPY_TYPE_PACKAGE,
1010 this_source_obj, state, context);
1011 if (ACPI_FAILURE(status)) {
1012 return_ACPI_STATUS(status);
1016 * Push the current state and create a new one
1017 * The callback above returned a new target package object.
1019 acpi_ut_push_generic_state(&state_list, state);
1020 state = acpi_ut_create_pkg_state(this_source_obj,
1022 this_target_obj, 0);
1025 /* Free any stacked Update State objects */
1027 while (state_list) {
1029 acpi_ut_pop_generic_state
1031 acpi_ut_delete_generic_state(state);
1033 return_ACPI_STATUS(AE_NO_MEMORY);
1038 /* We should never get here */
1040 return_ACPI_STATUS(AE_AML_INTERNAL);