acpi_status acpi_ns_initialize_devices()

in acpica/nsinit.c [105:241]

• 82 lines of code
• 12 McCabe index (conditional complexity)

acpi_status acpi_ns_initialize_devices(u32 flags)
{
	acpi_status status = AE_OK;
	struct acpi_device_walk_info info;
	acpi_handle handle;

	ACPI_FUNCTION_TRACE(ns_initialize_devices);

	if (!(flags & ACPI_NO_DEVICE_INIT)) {
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "[Init] Initializing ACPI Devices\n"));

		/* Init counters */

		info.device_count = 0;
		info.num_STA = 0;
		info.num_INI = 0;

		ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
				      "Initializing Device/Processor/Thermal objects "
				      "and executing _INI/_STA methods:\n"));

		/* Tree analysis: find all subtrees that contain _INI methods */

		status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
						ACPI_UINT32_MAX, FALSE,
						acpi_ns_find_ini_methods, NULL,
						&info, NULL);
		if (ACPI_FAILURE(status)) {
			goto error_exit;
		}

		/* Allocate the evaluation information block */

		info.evaluate_info =
		    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
		if (!info.evaluate_info) {
			status = AE_NO_MEMORY;
			goto error_exit;
		}

		/*
		 * Execute the "global" _INI method that may appear at the root.
		 * This support is provided for Windows compatibility (Vista+) and
		 * is not part of the ACPI specification.
		 */
		info.evaluate_info->prefix_node = acpi_gbl_root_node;
		info.evaluate_info->relative_pathname = METHOD_NAME__INI;
		info.evaluate_info->parameters = NULL;
		info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;

		status = acpi_ns_evaluate(info.evaluate_info);
		if (ACPI_SUCCESS(status)) {
			info.num_INI++;
		}

		/*
		 * Execute \_SB._INI.
		 * There appears to be a strict order requirement for \_SB._INI,
		 * which should be evaluated before any _REG evaluations.
		 */
		status = acpi_get_handle(NULL, "\\_SB", &handle);
		if (ACPI_SUCCESS(status)) {
			memset(info.evaluate_info, 0,
			       sizeof(struct acpi_evaluate_info));
			info.evaluate_info->prefix_node = handle;
			info.evaluate_info->relative_pathname =
			    METHOD_NAME__INI;
			info.evaluate_info->parameters = NULL;
			info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;

			status = acpi_ns_evaluate(info.evaluate_info);
			if (ACPI_SUCCESS(status)) {
				info.num_INI++;
			}
		}
	}

	/*
	 * Run all _REG methods
	 *
	 * Note: Any objects accessed by the _REG methods will be automatically
	 * initialized, even if they contain executable AML (see the call to
	 * acpi_ns_initialize_objects below).
	 *
	 * Note: According to the ACPI specification, we actually needn't execute
	 * _REG for system_memory/system_io operation regions, but for PCI_Config
	 * operation regions, it is required to evaluate _REG for those on a PCI
	 * root bus that doesn't contain _BBN object. So this code is kept here
	 * in order not to break things.
	 */
	if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "[Init] Executing _REG OpRegion methods\n"));

		status = acpi_ev_initialize_op_regions();
		if (ACPI_FAILURE(status)) {
			goto error_exit;
		}
	}

	if (!(flags & ACPI_NO_DEVICE_INIT)) {

		/* Walk namespace to execute all _INIs on present devices */

		status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
						ACPI_UINT32_MAX, FALSE,
						acpi_ns_init_one_device, NULL,
						&info, NULL);

		/*
		 * Any _OSI requests should be completed by now. If the BIOS has
		 * requested any Windows OSI strings, we will always truncate
		 * I/O addresses to 16 bits -- for Windows compatibility.
		 */
		if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) {
			acpi_gbl_truncate_io_addresses = TRUE;
		}

		ACPI_FREE(info.evaluate_info);
		if (ACPI_FAILURE(status)) {
			goto error_exit;
		}

		ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
				      "    Executed %u _INI methods requiring %u _STA executions "
				      "(examined %u objects)\n",
				      info.num_INI, info.num_STA,
				      info.device_count));
	}

	return_ACPI_STATUS(status);

error_exit:
	ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
	return_ACPI_STATUS(status);
}