/****************************************************************************** * * Module Name: nspredef - Validation of ACPI predefined methods and objects * $Revision: 1.1 $ * *****************************************************************************/ /* * Copyright (C) 2000 - 2008, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include #include "accommon.h" #include "acnamesp.h" #include "acpredef.h" #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nspredef") /******************************************************************************* * * This module validates predefined ACPI objects that appear in the namespace, * at the time they are evaluated (via acpi_evaluate_object). The purpose of this * validation is to detect problems with BIOS-exposed predefined ACPI objects * before the results are returned to the ACPI-related drivers. * * There are several areas that are validated: * * 1) The number of input arguments as defined by the method/object in the * ASL is validated against the ACPI specification. * 2) The type of the return object (if any) is validated against the ACPI * specification. * 3) For returned package objects, the count of package elements is * validated, as well as the type of each package element. Nested * packages are supported. * * For any problems found, a warning message is issued. * ******************************************************************************/ /* Local prototypes */ static acpi_status acpi_ns_check_package(struct acpi_predefined_data *data, union acpi_operand_object **return_object_ptr); static acpi_status acpi_ns_check_package_elements(struct acpi_predefined_data *data, union acpi_operand_object **elements, u8 type1, u32 count1, u8 type2, u32 count2, u32 start_index); static acpi_status acpi_ns_check_object_type(struct acpi_predefined_data *data, union acpi_operand_object **return_object_ptr, u32 expected_btypes, u32 package_index); static acpi_status acpi_ns_check_reference(struct acpi_predefined_data *data, union acpi_operand_object *return_object); static acpi_status acpi_ns_repair_object(struct acpi_predefined_data *data, u32 expected_btypes, u32 package_index, union acpi_operand_object **return_object_ptr); static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes); /* * Names for the types that can be returned by the predefined objects. * Used for warning messages. Must be in the same order as the ACPI_RTYPEs */ static const char *acpi_rtype_names[] = { "/Integer", "/String", "/Buffer", "/Package", "/Reference", }; /* Object is not a package element */ #define ACPI_NOT_PACKAGE_ELEMENT ACPI_UINT32_MAX /* Always emit warning message, not dependent on node flags */ #define ACPI_WARN_ALWAYS 0 /******************************************************************************* * * FUNCTION: acpi_ns_check_predefined_names * * PARAMETERS: Node - Namespace node for the method/object * user_param_count - Number of parameters actually passed * return_status - Status from the object evaluation * return_object_ptr - Pointer to the object returned from the * evaluation of a method or object * * RETURN: Status * * DESCRIPTION: Check an ACPI name for a match in the predefined name list. * ******************************************************************************/ acpi_status acpi_ns_check_predefined_names(struct acpi_namespace_node *node, u32 user_param_count, acpi_status return_status, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; acpi_status status = AE_OK; const union acpi_predefined_info *predefined; char *pathname; struct acpi_predefined_data *data; /* Match the name for this method/object against the predefined list */ predefined = acpi_ns_check_for_predefined_name(node); /* Get the full pathname to the object, for use in warning messages */ pathname = acpi_ns_get_external_pathname(node); if (!pathname) { return AE_OK; /* Could not get pathname, ignore */ } /* * Check that the parameter count for this method matches the ASL * definition. For predefined names, ensure that both the caller and * the method itself are in accordance with the ACPI specification. */ acpi_ns_check_parameter_count(pathname, node, user_param_count, predefined); /* If not a predefined name, we cannot validate the return object */ if (!predefined) { goto cleanup; } /* * If the method failed or did not actually return an object, we cannot * validate the return object */ if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) { goto cleanup; } /* * If there is no return value, check if we require a return value for * this predefined name. Either one return value is expected, or none, * for both methods and other objects. * * Exit now if there is no return object. Warning if one was expected. */ if (!return_object) { if ((predefined->info.expected_btypes) && (!(predefined->info.expected_btypes & ACPI_RTYPE_NONE))) { ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS, "Missing expected return value")); status = AE_AML_NO_RETURN_VALUE; } goto cleanup; } /* * We have a return value, but if one wasn't expected, just exit, this is * not a problem. For example, if the "Implicit Return" feature is * enabled, methods will always return a value. */ if (!predefined->info.expected_btypes) { goto cleanup; } /* Create the parameter data block for object validation */ data = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_predefined_data)); if (!data) { goto cleanup; } data->predefined = predefined; data->node_flags = node->flags; data->pathname = pathname; /* * Check that the type of the return object is what is expected for * this predefined name */ status = acpi_ns_check_object_type(data, return_object_ptr, predefined->info.expected_btypes, ACPI_NOT_PACKAGE_ELEMENT); if (ACPI_FAILURE(status)) { goto check_validation_status; } /* For returned Package objects, check the type of all sub-objects */ if (return_object->common.type == ACPI_TYPE_PACKAGE) { status = acpi_ns_check_package(data, return_object_ptr); } check_validation_status: /* * If the object validation failed or if we successfully repaired one * or more objects, mark the parent node to suppress further warning * messages during the next evaluation of the same method/object. */ if (ACPI_FAILURE(status) || (data->flags & ACPI_OBJECT_REPAIRED)) { node->flags |= ANOBJ_EVALUATED; } ACPI_FREE(data); cleanup: ACPI_FREE(pathname); return (status); } /******************************************************************************* * * FUNCTION: acpi_ns_check_parameter_count * * PARAMETERS: Pathname - Full pathname to the node (for error msgs) * Node - Namespace node for the method/object * user_param_count - Number of args passed in by the caller * Predefined - Pointer to entry in predefined name table * * RETURN: None * * DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a * predefined name is what is expected (i.e., what is defined in * the ACPI specification for this predefined name.) * ******************************************************************************/ void acpi_ns_check_parameter_count(char *pathname, struct acpi_namespace_node *node, u32 user_param_count, const union acpi_predefined_info *predefined) { u32 param_count; u32 required_params_current; u32 required_params_old; /* Methods have 0-7 parameters. All other types have zero. */ param_count = 0; if (node->type == ACPI_TYPE_METHOD) { param_count = node->object->method.param_count; } if (!predefined) { /* * Check the parameter count for non-predefined methods/objects. * * Warning if too few or too many arguments have been passed by the * caller. An incorrect number of arguments may not cause the method * to fail. However, the method will fail if there are too few * arguments and the method attempts to use one of the missing ones. */ if (user_param_count < param_count) { ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS, "Insufficient arguments - needs %u, found %u", param_count, user_param_count)); } else if (user_param_count > param_count) { ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS, "Excess arguments - needs %u, found %u", param_count, user_param_count)); } return; } /* * Validate the user-supplied parameter count. * Allow two different legal argument counts (_SCP, etc.) */ required_params_current = predefined->info.param_count & 0x0F; required_params_old = predefined->info.param_count >> 4; if (user_param_count != ACPI_UINT32_MAX) { if ((user_param_count != required_params_current) && (user_param_count != required_params_old)) { ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS, "Parameter count mismatch - " "caller passed %u, ACPI requires %u", user_param_count, required_params_current)); } } /* * Check that the ASL-defined parameter count is what is expected for * this predefined name (parameter count as defined by the ACPI * specification) */ if ((param_count != required_params_current) && (param_count != required_params_old)) { ACPI_WARN_PREDEFINED((AE_INFO, pathname, node->flags, "Parameter count mismatch - ASL declared %u, ACPI requires %u", param_count, required_params_current)); } } /******************************************************************************* * * FUNCTION: acpi_ns_check_for_predefined_name * * PARAMETERS: Node - Namespace node for the method/object * * RETURN: Pointer to entry in predefined table. NULL indicates not found. * * DESCRIPTION: Check an object name against the predefined object list. * ******************************************************************************/ const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct acpi_namespace_node *node) { const union acpi_predefined_info *this_name; /* Quick check for a predefined name, first character must be underscore */ if (node->name.ascii[0] != '_') { return (NULL); } /* Search info table for a predefined method/object name */ this_name = predefined_names; while (this_name->info.name[0]) { if (ACPI_COMPARE_NAME(node->name.ascii, this_name->info.name)) { return (this_name); } /* * Skip next entry in the table if this name returns a Package * (next entry contains the package info) */ if (this_name->info.expected_btypes & ACPI_RTYPE_PACKAGE) { this_name++; } this_name++; } return (NULL); /* Not found */ } /******************************************************************************* * * FUNCTION: acpi_ns_check_package * * PARAMETERS: Data - Pointer to validation data structure * return_object_ptr - Pointer to the object returned from the * evaluation of a method or object * * RETURN: Status * * DESCRIPTION: Check a returned package object for the correct count and * correct type of all sub-objects. * ******************************************************************************/ static acpi_status acpi_ns_check_package(struct acpi_predefined_data *data, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; const union acpi_predefined_info *package; union acpi_operand_object *sub_package; union acpi_operand_object **elements; union acpi_operand_object **sub_elements; acpi_status status; u32 expected_count; u32 count; u32 i; u32 j; ACPI_FUNCTION_NAME(ns_check_package); /* The package info for this name is in the next table entry */ package = data->predefined + 1; ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s Validating return Package of Type %X, Count %X\n", data->pathname, package->ret_info.type, return_object->package.count)); /* Extract package count and elements array */ elements = return_object->package.elements; count = return_object->package.count; /* The package must have at least one element, else invalid */ if (!count) { ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Return Package has no elements (empty)")); return (AE_AML_OPERAND_VALUE); } /* * Decode the type of the expected package contents * * PTYPE1 packages contain no subpackages * PTYPE2 packages contain sub-packages */ switch (package->ret_info.type) { case ACPI_PTYPE1_FIXED: /* * The package count is fixed and there are no sub-packages * * If package is too small, exit. * If package is larger than expected, issue warning but continue */ expected_count = package->ret_info.count1 + package->ret_info.count2; if (count < expected_count) { goto package_too_small; } else if (count > expected_count) { ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Return Package is larger than needed - " "found %u, expected %u", count, expected_count)); } /* Validate all elements of the returned package */ status = acpi_ns_check_package_elements(data, elements, package->ret_info. object_type1, package->ret_info. count1, package->ret_info. object_type2, package->ret_info. count2, 0); if (ACPI_FAILURE(status)) { return (status); } break; case ACPI_PTYPE1_VAR: /* * The package count is variable, there are no sub-packages, and all * elements must be of the same type */ for (i = 0; i < count; i++) { status = acpi_ns_check_object_type(data, elements, package->ret_info. object_type1, i); if (ACPI_FAILURE(status)) { return (status); } elements++; } break; case ACPI_PTYPE1_OPTION: /* * The package count is variable, there are no sub-packages. There are * a fixed number of required elements, and a variable number of * optional elements. * * Check if package is at least as large as the minimum required */ expected_count = package->ret_info3.count; if (count < expected_count) { goto package_too_small; } /* Variable number of sub-objects */ for (i = 0; i < count; i++) { if (i < package->ret_info3.count) { /* These are the required package elements (0, 1, or 2) */ status = acpi_ns_check_object_type(data, elements, package-> ret_info3. object_type[i], i); if (ACPI_FAILURE(status)) { return (status); } } else { /* These are the optional package elements */ status = acpi_ns_check_object_type(data, elements, package-> ret_info3. tail_object_type, i); if (ACPI_FAILURE(status)) { return (status); } } elements++; } break; case ACPI_PTYPE2_PKG_COUNT: /* First element is the (Integer) count of sub-packages to follow */ status = acpi_ns_check_object_type(data, elements, ACPI_RTYPE_INTEGER, 0); if (ACPI_FAILURE(status)) { return (status); } /* * Count cannot be larger than the parent package length, but allow it * to be smaller. The >= accounts for the Integer above. */ expected_count = (u32) (*elements)->integer.value; if (expected_count >= count) { goto package_too_small; } count = expected_count; elements++; /* Now we can walk the sub-packages */ /*lint -fallthrough */ case ACPI_PTYPE2: case ACPI_PTYPE2_FIXED: case ACPI_PTYPE2_MIN: case ACPI_PTYPE2_COUNT: /* * These types all return a single package that consists of a variable * number of sub-packages */ for (i = 0; i < count; i++) { sub_package = *elements; sub_elements = sub_package->package.elements; /* Each sub-object must be of type Package */ status = acpi_ns_check_object_type(data, &sub_package, ACPI_RTYPE_PACKAGE, i); if (ACPI_FAILURE(status)) { return (status); } /* Examine the different types of sub-packages */ switch (package->ret_info.type) { case ACPI_PTYPE2: case ACPI_PTYPE2_PKG_COUNT: /* Each subpackage has a fixed number of elements */ expected_count = package->ret_info.count1 + package->ret_info.count2; if (sub_package->package.count != expected_count) { count = sub_package->package.count; goto package_too_small; } status = acpi_ns_check_package_elements(data, sub_elements, package-> ret_info. object_type1, package-> ret_info. count1, package-> ret_info. object_type2, package-> ret_info. count2, 0); if (ACPI_FAILURE(status)) { return (status); } break; case ACPI_PTYPE2_FIXED: /* Each sub-package has a fixed length */ expected_count = package->ret_info2.count; if (sub_package->package.count < expected_count) { count = sub_package->package.count; goto package_too_small; } /* Check the type of each sub-package element */ for (j = 0; j < expected_count; j++) { status = acpi_ns_check_object_type(data, &sub_elements[j], package->ret_info2.object_type[j], j); if (ACPI_FAILURE(status)) { return (status); } } break; case ACPI_PTYPE2_MIN: /* Each sub-package has a variable but minimum length */ expected_count = package->ret_info.count1; if (sub_package->package.count < expected_count) { count = sub_package->package.count; goto package_too_small; } /* Check the type of each sub-package element */ status = acpi_ns_check_package_elements(data, sub_elements, package-> ret_info. object_type1, sub_package-> package. count, 0, 0, 0); if (ACPI_FAILURE(status)) { return (status); } break; case ACPI_PTYPE2_COUNT: /* First element is the (Integer) count of elements to follow */ status = acpi_ns_check_object_type(data, sub_elements, ACPI_RTYPE_INTEGER, 0); if (ACPI_FAILURE(status)) { return (status); } /* Make sure package is large enough for the Count */ expected_count = (u32) (*sub_elements)->integer.value; if (sub_package->package.count < expected_count) { count = sub_package->package.count; goto package_too_small; } /* Check the type of each sub-package element */ status = acpi_ns_check_package_elements(data, (sub_elements + 1), package-> ret_info. object_type1, (expected_count - 1), 0, 0, 1); if (ACPI_FAILURE(status)) { return (status); } break; default: break; } elements++; } break; default: /* Should not get here if predefined info table is correct */ ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Invalid internal return type in table entry: %X", package->ret_info.type)); return (AE_AML_INTERNAL); } return (AE_OK); package_too_small: /* Error exit for the case with an incorrect package count */ ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Return Package is too small - found %u, expected %u", count, expected_count)); return (AE_AML_OPERAND_VALUE); } /******************************************************************************* * * FUNCTION: acpi_ns_check_package_elements * * PARAMETERS: Data - Pointer to validation data structure * Elements - Pointer to the package elements array * Type1 - Object type for first group * Count1 - Count for first group * Type2 - Object type for second group * Count2 - Count for second group * start_index - Start of the first group of elements * * RETURN: Status * * DESCRIPTION: Check that all elements of a package are of the correct object * type. Supports up to two groups of different object types. * ******************************************************************************/ static acpi_status acpi_ns_check_package_elements(struct acpi_predefined_data *data, union acpi_operand_object **elements, u8 type1, u32 count1, u8 type2, u32 count2, u32 start_index) { union acpi_operand_object **this_element = elements; acpi_status status; u32 i; /* * Up to two groups of package elements are supported by the data * structure. All elements in each group must be of the same type. * The second group can have a count of zero. */ for (i = 0; i < count1; i++) { status = acpi_ns_check_object_type(data, this_element, type1, i + start_index); if (ACPI_FAILURE(status)) { return (status); } this_element++; } for (i = 0; i < count2; i++) { status = acpi_ns_check_object_type(data, this_element, type2, (i + count1 + start_index)); if (ACPI_FAILURE(status)) { return (status); } this_element++; } return (AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ns_check_object_type * * PARAMETERS: Data - Pointer to validation data structure * return_object_ptr - Pointer to the object returned from the * evaluation of a method or object * expected_btypes - Bitmap of expected return type(s) * package_index - Index of object within parent package (if * applicable - ACPI_NOT_PACKAGE_ELEMENT * otherwise) * * RETURN: Status * * DESCRIPTION: Check the type of the return object against the expected object * type(s). Use of Btype allows multiple expected object types. * ******************************************************************************/ static acpi_status acpi_ns_check_object_type(struct acpi_predefined_data *data, union acpi_operand_object **return_object_ptr, u32 expected_btypes, u32 package_index) { union acpi_operand_object *return_object = *return_object_ptr; acpi_status status = AE_OK; u32 return_btype; char type_buffer[48]; /* Room for 5 types */ /* * If we get a NULL return_object here, it is a NULL package element, * and this is always an error. */ if (!return_object) { goto type_error_exit; } /* A Namespace node should not get here, but make sure */ if (ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) { ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Invalid return type - Found a Namespace node [%4.4s] type %s", return_object->node.name.ascii, acpi_ut_get_type_name(return_object->node. type))); return (AE_AML_OPERAND_TYPE); } /* * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type. * The bitmapped type allows multiple possible return types. * * Note, the cases below must handle all of the possible types returned * from all of the predefined names (including elements of returned * packages) */ switch (return_object->common.type) { case ACPI_TYPE_INTEGER: return_btype = ACPI_RTYPE_INTEGER; break; case ACPI_TYPE_BUFFER: return_btype = ACPI_RTYPE_BUFFER; break; case ACPI_TYPE_STRING: return_btype = ACPI_RTYPE_STRING; break; case ACPI_TYPE_PACKAGE: return_btype = ACPI_RTYPE_PACKAGE; break; case ACPI_TYPE_LOCAL_REFERENCE: return_btype = ACPI_RTYPE_REFERENCE; break; default: /* Not one of the supported objects, must be incorrect */ goto type_error_exit; } /* Is the object one of the expected types? */ if (!(return_btype & expected_btypes)) { /* Type mismatch -- attempt repair of the returned object */ status = acpi_ns_repair_object(data, expected_btypes, package_index, return_object_ptr); if (ACPI_SUCCESS(status)) { return (AE_OK); /* Repair was successful */ } goto type_error_exit; } /* For reference objects, check that the reference type is correct */ if (return_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) { status = acpi_ns_check_reference(data, return_object); } return (status); type_error_exit: /* Create a string with all expected types for this predefined object */ acpi_ns_get_expected_types(type_buffer, expected_btypes); if (package_index == ACPI_NOT_PACKAGE_ELEMENT) { ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Return type mismatch - found %s, expected %s", acpi_ut_get_object_type_name (return_object), type_buffer)); } else { ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Return Package type mismatch at index %u - " "found %s, expected %s", package_index, acpi_ut_get_object_type_name (return_object), type_buffer)); } return (AE_AML_OPERAND_TYPE); } /******************************************************************************* * * FUNCTION: acpi_ns_check_reference * * PARAMETERS: Data - Pointer to validation data structure * return_object - Object returned from the evaluation of a * method or object * * RETURN: Status * * DESCRIPTION: Check a returned reference object for the correct reference * type. The only reference type that can be returned from a * predefined method is a named reference. All others are invalid. * ******************************************************************************/ static acpi_status acpi_ns_check_reference(struct acpi_predefined_data *data, union acpi_operand_object *return_object) { /* * Check the reference object for the correct reference type (opcode). * The only type of reference that can be converted to an union acpi_object is * a reference to a named object (reference class: NAME) */ if (return_object->reference.class == ACPI_REFCLASS_NAME) { return (AE_OK); } ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Return type mismatch - unexpected reference object type [%s] %2.2X", acpi_ut_get_reference_name(return_object), return_object->reference.class)); return (AE_AML_OPERAND_TYPE); } /******************************************************************************* * * FUNCTION: acpi_ns_repair_object * * PARAMETERS: Data - Pointer to validation data structure * expected_btypes - Object types expected * package_index - Index of object within parent package (if * applicable - ACPI_NOT_PACKAGE_ELEMENT * otherwise) * return_object_ptr - Pointer to the object returned from the * evaluation of a method or object * * RETURN: Status. AE_OK if repair was successful. * * DESCRIPTION: Attempt to repair/convert a return object of a type that was * not expected. * ******************************************************************************/ static acpi_status acpi_ns_repair_object(struct acpi_predefined_data *data, u32 expected_btypes, u32 package_index, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; union acpi_operand_object *new_object; acpi_size length; switch (return_object->common.type) { case ACPI_TYPE_BUFFER: /* Does the method/object legally return a string? */ if (!(expected_btypes & ACPI_RTYPE_STRING)) { return (AE_AML_OPERAND_TYPE); } /* * Have a Buffer, expected a String, convert. Use a to_string * conversion, no transform performed on the buffer data. The best * example of this is the _BIF method, where the string data from * the battery is often (incorrectly) returned as buffer object(s). */ length = 0; while ((length < return_object->buffer.length) && (return_object->buffer.pointer[length])) { length++; } /* Allocate a new string object */ new_object = acpi_ut_create_string_object(length); if (!new_object) { return (AE_NO_MEMORY); } /* * Copy the raw buffer data with no transform. String is already NULL * terminated at Length+1. */ ACPI_MEMCPY(new_object->string.pointer, return_object->buffer.pointer, length); /* * If the original object is a package element, we need to: * 1. Set the reference count of the new object to match the * reference count of the old object. * 2. Decrement the reference count of the original object. */ if (package_index != ACPI_NOT_PACKAGE_ELEMENT) { new_object->common.reference_count = return_object->common.reference_count; if (return_object->common.reference_count > 1) { return_object->common.reference_count--; } ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Converted Buffer to expected String at index %u", package_index)); } else { ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Converted Buffer to expected String")); } /* Delete old object, install the new return object */ acpi_ut_remove_reference(return_object); *return_object_ptr = new_object; data->flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); default: break; } return (AE_AML_OPERAND_TYPE); } /******************************************************************************* * * FUNCTION: acpi_ns_get_expected_types * * PARAMETERS: Buffer - Pointer to where the string is returned * expected_btypes - Bitmap of expected return type(s) * * RETURN: Buffer is populated with type names. * * DESCRIPTION: Translate the expected types bitmap into a string of ascii * names of expected types, for use in warning messages. * ******************************************************************************/ static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes) { u32 this_rtype; u32 i; u32 j; j = 1; buffer[0] = 0; this_rtype = ACPI_RTYPE_INTEGER; for (i = 0; i < ACPI_NUM_RTYPES; i++) { /* If one of the expected types, concatenate the name of this type */ if (expected_btypes & this_rtype) { ACPI_STRCAT(buffer, &acpi_rtype_names[i][j]); j = 0; /* Use name separator from now on */ } this_rtype <<= 1; /* Next Rtype */ } }