/******************************************************************************* * * FUNCTION: acpi_evaluate_object * * PARAMETERS: handle - Object handle (optional) * pathname - Object pathname (optional) * external_params - List of parameters to pass to method, * terminated by NULL. May be NULL * if no parameters are being passed. * return_buffer - Where to put method's return value (if * any). If NULL, no value is returned. * * RETURN: Status * * DESCRIPTION: Find and evaluate the given object, passing the given * parameters if necessary. One of "Handle" or "Pathname" must * be valid (non-null) * ******************************************************************************/ acpi_status acpi_evaluate_object(acpi_handle handle, acpi_string pathname, struct acpi_object_list *external_params, struct acpi_buffer *return_buffer) { acpi_status status; struct acpi_evaluate_info *info; acpi_size buffer_space_needed; u32 i; ACPI_FUNCTION_TRACE(acpi_evaluate_object); /* Allocate and initialize the evaluation information block */ info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); if (!info) { return_ACPI_STATUS(AE_NO_MEMORY); } /* Convert and validate the device handle */ info->prefix_node = acpi_ns_validate_handle(handle); if (!info->prefix_node) { status = AE_BAD_PARAMETER; goto cleanup; } /* * Get the actual namespace node for the target object. * Handles these cases: * * 1) Null node, valid pathname from root (absolute path) * 2) Node and valid pathname (path relative to Node) * 3) Node, Null pathname */ if ((pathname) && (ACPI_IS_ROOT_PREFIX(pathname[0]))) { /* The path is fully qualified, just evaluate by name */ info->prefix_node = NULL; } else if (!handle) { /* * A handle is optional iff a fully qualified pathname is specified. * Since we've already handled fully qualified names above, this is * an error. */ if (!pathname) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Both Handle and Pathname are NULL")); } else { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Null Handle with relative pathname [%s]", pathname)); } status = AE_BAD_PARAMETER; goto cleanup; } info->relative_pathname = pathname; /* * Convert all external objects passed as arguments to the * internal version(s). */ if (external_params && external_params->count) { info->param_count = (u16)external_params->count; /* Warn on impossible argument count */ if (info->param_count > ACPI_METHOD_NUM_ARGS) { ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS, "Excess arguments (%u) - using only %u", info->param_count, ACPI_METHOD_NUM_ARGS)); info->param_count = ACPI_METHOD_NUM_ARGS; } /* * Allocate a new parameter block for the internal objects * Add 1 to count to allow for null terminated internal list */ info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)info-> param_count + 1) * sizeof(void *)); if (!info->parameters) { status = AE_NO_MEMORY; goto cleanup; } /* Convert each external object in the list to an internal object */ for (i = 0; i < info->param_count; i++) { status = acpi_ut_copy_eobject_to_iobject(&external_params-> pointer[i], &info-> parameters[i]); if (ACPI_FAILURE(status)) { goto cleanup; } } info->parameters[info->param_count] = NULL; } #ifdef _FUTURE_FEATURE /* * Begin incoming argument count analysis. Check for too few args * and too many args. */ switch (acpi_ns_get_type(info->node)) { case ACPI_TYPE_METHOD: /* Check incoming argument count against the method definition */ if (info->obj_desc->method.param_count > info->param_count) { ACPI_ERROR((AE_INFO, "Insufficient arguments (%u) - %u are required", info->param_count, info->obj_desc->method.param_count)); status = AE_MISSING_ARGUMENTS; goto cleanup; } else if (info->obj_desc->method.param_count < info->param_count) { ACPI_WARNING((AE_INFO, "Excess arguments (%u) - only %u are required", info->param_count, info->obj_desc->method.param_count)); /* Just pass the required number of arguments */ info->param_count = info->obj_desc->method.param_count; } /* * Any incoming external objects to be passed as arguments to the * method must be converted to internal objects */ if (info->param_count) { /* * Allocate a new parameter block for the internal objects * Add 1 to count to allow for null terminated internal list */ info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) info-> param_count + 1) * sizeof(void *)); if (!info->parameters) { status = AE_NO_MEMORY; goto cleanup; } /* Convert each external object in the list to an internal object */ for (i = 0; i < info->param_count; i++) { status = acpi_ut_copy_eobject_to_iobject (&external_params->pointer[i], &info->parameters[i]); if (ACPI_FAILURE(status)) { goto cleanup; } } info->parameters[info->param_count] = NULL; } break; default: /* Warn if arguments passed to an object that is not a method */ if (info->param_count) { ACPI_WARNING((AE_INFO, "%u arguments were passed to a non-method ACPI object", info->param_count)); } break; } #endif /* Now we can evaluate the object */ status = acpi_ns_evaluate(info); /* * If we are expecting a return value, and all went well above, * copy the return value to an external object. */ if (!return_buffer) { goto cleanup_return_object; } if (!info->return_object) { return_buffer->length = 0; goto cleanup; } if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == ACPI_DESC_TYPE_NAMED) { /* * If we received a NS Node as a return object, this means that * the object we are evaluating has nothing interesting to * return (such as a mutex, etc.) We return an error because * these types are essentially unsupported by this interface. * We don't check up front because this makes it easier to add * support for various types at a later date if necessary. */ status = AE_TYPE; info->return_object = NULL; /* No need to delete a NS Node */ return_buffer->length = 0; } if (ACPI_FAILURE(status)) { goto cleanup_return_object; } /* Dereference Index and ref_of references */ acpi_ns_resolve_references(info); /* Get the size of the returned object */ status = acpi_ut_get_object_size(info->return_object, &buffer_space_needed); if (ACPI_SUCCESS(status)) { /* Validate/Allocate/Clear caller buffer */ status = acpi_ut_initialize_buffer(return_buffer, buffer_space_needed); if (ACPI_FAILURE(status)) { /* * Caller's buffer is too small or a new one can't * be allocated */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Needed buffer size %X, %s\n", (u32)buffer_space_needed, acpi_format_exception(status))); } else { /* We have enough space for the object, build it */ status = acpi_ut_copy_iobject_to_eobject(info->return_object, return_buffer); } } cleanup_return_object: if (info->return_object) { /* * Delete the internal return object. NOTE: Interpreter must be * locked to avoid race condition. */ acpi_ex_enter_interpreter(); /* Remove one reference on the return object (should delete it) */ acpi_ut_remove_reference(info->return_object); acpi_ex_exit_interpreter(); } cleanup: /* Free the input parameter list (if we created one) */ if (info->parameters) { /* Free the allocated parameter block */ acpi_ut_delete_internal_object_list(info->parameters); } ACPI_FREE(info); return_ACPI_STATUS(status); }
/******************************************************************************* * * FUNCTION: acpi_evaluate_object * * PARAMETERS: handle - Object handle (optional) * pathname - Object pathname (optional) * external_params - List of parameters to pass to method, * terminated by NULL. May be NULL * if no parameters are being passed. * return_buffer - Where to put method's return value (if * any). If NULL, no value is returned. * * RETURN: Status * * DESCRIPTION: Find and evaluate the given object, passing the given * parameters if necessary. One of "Handle" or "Pathname" must * be valid (non-null) * ******************************************************************************/ acpi_status acpi_evaluate_object(acpi_handle handle, acpi_string pathname, struct acpi_object_list *external_params, struct acpi_buffer *return_buffer) { acpi_status status; struct acpi_evaluate_info *info; acpi_size buffer_space_needed; u32 i; ACPI_FUNCTION_TRACE(acpi_evaluate_object); /* Allocate and initialize the evaluation information block */ info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); if (!info) { return_ACPI_STATUS(AE_NO_MEMORY); } info->pathname = pathname; /* Convert and validate the device handle */ info->prefix_node = acpi_ns_validate_handle(handle); if (!info->prefix_node) { status = AE_BAD_PARAMETER; goto cleanup; } /* * If there are parameters to be passed to a control method, the external * objects must all be converted to internal objects */ if (external_params && external_params->count) { /* * Allocate a new parameter block for the internal objects * Add 1 to count to allow for null terminated internal list */ info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) external_params-> count + 1) * sizeof(void *)); if (!info->parameters) { status = AE_NO_MEMORY; goto cleanup; } /* Convert each external object in the list to an internal object */ for (i = 0; i < external_params->count; i++) { status = acpi_ut_copy_eobject_to_iobject(&external_params-> pointer[i], &info-> parameters[i]); if (ACPI_FAILURE(status)) { goto cleanup; } } info->parameters[external_params->count] = NULL; } /* * Three major cases: * 1) Fully qualified pathname * 2) No handle, not fully qualified pathname (error) * 3) Valid handle */ if ((pathname) && (ACPI_IS_ROOT_PREFIX(pathname[0]))) { /* The path is fully qualified, just evaluate by name */ info->prefix_node = NULL; status = acpi_ns_evaluate(info); } else if (!handle) { /* * A handle is optional iff a fully qualified pathname is specified. * Since we've already handled fully qualified names above, this is * an error */ if (!pathname) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Both Handle and Pathname are NULL")); } else { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Null Handle with relative pathname [%s]", pathname)); } status = AE_BAD_PARAMETER; } else { /* We have a namespace a node and a possible relative path */ status = acpi_ns_evaluate(info); } /* * If we are expecting a return value, and all went well above, * copy the return value to an external object. */ if (return_buffer) { if (!info->return_object) { return_buffer->length = 0; } else { if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == ACPI_DESC_TYPE_NAMED) { /* * If we received a NS Node as a return object, this means that * the object we are evaluating has nothing interesting to * return (such as a mutex, etc.) We return an error because * these types are essentially unsupported by this interface. * We don't check up front because this makes it easier to add * support for various types at a later date if necessary. */ status = AE_TYPE; info->return_object = NULL; /* No need to delete a NS Node */ return_buffer->length = 0; } if (ACPI_SUCCESS(status)) { /* Dereference Index and ref_of references */ acpi_ns_resolve_references(info); /* Get the size of the returned object */ status = acpi_ut_get_object_size(info->return_object, &buffer_space_needed); if (ACPI_SUCCESS(status)) { /* Validate/Allocate/Clear caller buffer */ status = acpi_ut_initialize_buffer (return_buffer, buffer_space_needed); if (ACPI_FAILURE(status)) { /* * Caller's buffer is too small or a new one can't * be allocated */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Needed buffer size %X, %s\n", (u32) buffer_space_needed, acpi_format_exception (status))); } else { /* We have enough space for the object, build it */ status = acpi_ut_copy_iobject_to_eobject (info->return_object, return_buffer); } } } } } if (info->return_object) { /* * Delete the internal return object. NOTE: Interpreter must be * locked to avoid race condition. */ acpi_ex_enter_interpreter(); /* Remove one reference on the return object (should delete it) */ acpi_ut_remove_reference(info->return_object); acpi_ex_exit_interpreter(); } cleanup: /* Free the input parameter list (if we created one) */ if (info->parameters) { /* Free the allocated parameter block */ acpi_ut_delete_internal_object_list(info->parameters); } ACPI_FREE(info); return_ACPI_STATUS(status); }
acpi_status acpi_evaluate_object ( acpi_handle handle, acpi_string pathname, struct acpi_object_list *external_params, struct acpi_buffer *return_buffer) { acpi_status status; acpi_status status2; struct acpi_parameter_info info; acpi_size buffer_space_needed; u32 i; ACPI_FUNCTION_TRACE ("acpi_evaluate_object"); info.node = handle; info.parameters = NULL; info.return_object = NULL; info.parameter_type = ACPI_PARAM_ARGS; /* * If there are parameters to be passed to the object * (which must be a control method), the external objects * must be converted to internal objects */ if (external_params && external_params->count) { /* * Allocate a new parameter block for the internal objects * Add 1 to count to allow for null terminated internal list */ info.parameters = ACPI_MEM_CALLOCATE ( ((acpi_size) external_params->count + 1) * sizeof (void *)); if (!info.parameters) { return_ACPI_STATUS (AE_NO_MEMORY); } /* * Convert each external object in the list to an * internal object */ for (i = 0; i < external_params->count; i++) { status = acpi_ut_copy_eobject_to_iobject (&external_params->pointer[i], &info.parameters[i]); if (ACPI_FAILURE (status)) { acpi_ut_delete_internal_object_list (info.parameters); return_ACPI_STATUS (status); } } info.parameters[external_params->count] = NULL; } /* * Three major cases: * 1) Fully qualified pathname * 2) No handle, not fully qualified pathname (error) * 3) Valid handle */ if ((pathname) && (acpi_ns_valid_root_prefix (pathname[0]))) { /* * The path is fully qualified, just evaluate by name */ status = acpi_ns_evaluate_by_name (pathname, &info); } else if (!handle) { /* * A handle is optional iff a fully qualified pathname * is specified. Since we've already handled fully * qualified names above, this is an error */ if (!pathname) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Both Handle and Pathname are NULL\n")); } else { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Handle is NULL and Pathname is relative\n")); } status = AE_BAD_PARAMETER; } else { /* * We get here if we have a handle -- and if we have a * pathname it is relative. The handle will be validated * in the lower procedures */ if (!pathname) { /* * The null pathname case means the handle is for * the actual object to be evaluated */ status = acpi_ns_evaluate_by_handle (&info); } else { /* * Both a Handle and a relative Pathname */ status = acpi_ns_evaluate_relative (pathname, &info); } } /* * If we are expecting a return value, and all went well above, * copy the return value to an external object. */ if (return_buffer) { if (!info.return_object) { return_buffer->length = 0; } else { if (ACPI_GET_DESCRIPTOR_TYPE (info.return_object) == ACPI_DESC_TYPE_NAMED) { /* * If we received a NS Node as a return object, this means that * the object we are evaluating has nothing interesting to * return (such as a mutex, etc.) We return an error because * these types are essentially unsupported by this interface. * We don't check up front because this makes it easier to add * support for various types at a later date if necessary. */ status = AE_TYPE; info.return_object = NULL; /* No need to delete a NS Node */ return_buffer->length = 0; } if (ACPI_SUCCESS (status)) { /* * Find out how large a buffer is needed * to contain the returned object */ status = acpi_ut_get_object_size (info.return_object, &buffer_space_needed); if (ACPI_SUCCESS (status)) { /* Validate/Allocate/Clear caller buffer */ status = acpi_ut_initialize_buffer (return_buffer, buffer_space_needed); if (ACPI_FAILURE (status)) { /* * Caller's buffer is too small or a new one can't be allocated */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Needed buffer size %X, %s\n", (u32) buffer_space_needed, acpi_format_exception (status))); } else { /* * We have enough space for the object, build it */ status = acpi_ut_copy_iobject_to_eobject (info.return_object, return_buffer); } } } } } if (info.return_object) { /* * Delete the internal return object. NOTE: Interpreter * must be locked to avoid race condition. */ status2 = acpi_ex_enter_interpreter (); if (ACPI_SUCCESS (status2)) { /* * Delete the internal return object. (Or at least * decrement the reference count by one) */ acpi_ut_remove_reference (info.return_object); acpi_ex_exit_interpreter (); } } /* * Free the input parameter list (if we created one), */ if (info.parameters) { /* Free the allocated parameter block */ acpi_ut_delete_internal_object_list (info.parameters); } return_ACPI_STATUS (status); }