tbxface.c

来自「linux 内核源代码」· C语言 代码 · 共 648 行 · 第 1/2 页

ACPI_EXPORT_SYMBOL(acpi_get_table_header)

/******************************************************************************
 *
 * FUNCTION:    acpi_unload_table_id
 *
 * PARAMETERS:  id            - Owner ID of the table to be removed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This routine is used to force the unload of a table (by id)
 *
 ******************************************************************************/
acpi_status acpi_unload_table_id(acpi_owner_id id)
{
	int i;
	acpi_status status = AE_NOT_EXIST;

	ACPI_FUNCTION_TRACE(acpi_unload_table_id);

	/* Find table in the global table list */
	for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
		if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
			continue;
		}
		/*
		 * Delete all namespace objects owned by this table. Note that these
		 * objects can appear anywhere in the namespace by virtue of the AML
		 * "Scope" operator. Thus, we need to track ownership by an ID, not
		 * simply a position within the hierarchy
		 */
		acpi_tb_delete_namespace_by_owner(i);
		status = acpi_tb_release_owner_id(i);
		acpi_tb_set_table_loaded_flag(i, FALSE);
		break;
	}
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_unload_table_id)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_table
 *
 * PARAMETERS:  Signature           - ACPI signature of needed table
 *              Instance            - Which instance (for SSDTs)
 *              out_table           - Where the pointer to the table is returned
 *
 * RETURN:      Status and pointer to table
 *
 * DESCRIPTION: Finds and verifies an ACPI table.
 *
 *****************************************************************************/
acpi_status
acpi_get_table(char *signature,
	       acpi_native_uint instance, struct acpi_table_header **out_table)
{
	acpi_native_uint i;
	acpi_native_uint j;
	acpi_status status;

	/* Parameter validation */

	if (!signature || !out_table) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * Walk the root table list
	 */
	for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
		if (!ACPI_COMPARE_NAME
		    (&(acpi_gbl_root_table_list.tables[i].signature),
		     signature)) {
			continue;
		}

		if (++j < instance) {
			continue;
		}

		status =
		    acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
		if (ACPI_SUCCESS(status)) {
			*out_table = acpi_gbl_root_table_list.tables[i].pointer;
		}

		if (!acpi_gbl_permanent_mmap) {
			acpi_gbl_root_table_list.tables[i].pointer = NULL;
		}

		return (status);
	}

	return (AE_NOT_FOUND);
}

ACPI_EXPORT_SYMBOL(acpi_get_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_table_by_index
 *
 * PARAMETERS:  table_index         - Table index
 *              Table               - Where the pointer to the table is returned
 *
 * RETURN:      Status and pointer to the table
 *
 * DESCRIPTION: Obtain a table by an index into the global table list.
 *
 ******************************************************************************/
acpi_status
acpi_get_table_by_index(acpi_native_uint table_index,
			struct acpi_table_header ** table)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_get_table_by_index);

	/* Parameter validation */

	if (!table) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

	/* Validate index */

	if (table_index >= acpi_gbl_root_table_list.count) {
		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (!acpi_gbl_root_table_list.tables[table_index].pointer) {

		/* Table is not mapped, map it */

		status =
		    acpi_tb_verify_table(&acpi_gbl_root_table_list.
					 tables[table_index]);
		if (ACPI_FAILURE(status)) {
			(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
			return_ACPI_STATUS(status);
		}
	}

	*table = acpi_gbl_root_table_list.tables[table_index].pointer;
	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_load_namespace
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 *              the RSDT/XSDT.
 *
 ******************************************************************************/
static acpi_status acpi_tb_load_namespace(void)
{
	acpi_status status;
	struct acpi_table_header *table;
	acpi_native_uint i;

	ACPI_FUNCTION_TRACE(tb_load_namespace);

	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

	/*
	 * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
	 * are optional.
	 */
	if (!acpi_gbl_root_table_list.count ||
	    !ACPI_COMPARE_NAME(&
			       (acpi_gbl_root_table_list.
				tables[ACPI_TABLE_INDEX_DSDT].signature),
			       ACPI_SIG_DSDT)
	    ||
	    ACPI_FAILURE(acpi_tb_verify_table
			 (&acpi_gbl_root_table_list.
			  tables[ACPI_TABLE_INDEX_DSDT]))) {
		status = AE_NO_ACPI_TABLES;
		goto unlock_and_exit;
	}

	/*
	 * Find DSDT table
	 */
	status =
	    acpi_os_table_override(acpi_gbl_root_table_list.
				   tables[ACPI_TABLE_INDEX_DSDT].pointer,
				   &table);
	if (ACPI_SUCCESS(status) && table) {
		/*
		 * DSDT table has been found
		 */
		acpi_tb_delete_table(&acpi_gbl_root_table_list.
				     tables[ACPI_TABLE_INDEX_DSDT]);
		acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer =
		    table;
		acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].length =
		    table->length;
		acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].flags =
		    ACPI_TABLE_ORIGIN_UNKNOWN;

		ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS"));
		acpi_tb_print_table_header(0, table);

		if (no_auto_ssdt == 0) {
			printk(KERN_WARNING "ACPI: DSDT override uses original SSDTs unless \"acpi_no_auto_ssdt\"");
		}
	}

	status =
	    acpi_tb_verify_table(&acpi_gbl_root_table_list.
				 tables[ACPI_TABLE_INDEX_DSDT]);
	if (ACPI_FAILURE(status)) {

		/* A valid DSDT is required */

		status = AE_NO_ACPI_TABLES;
		goto unlock_and_exit;
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);

	/*
	 * Load and parse tables.
	 */
	status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
	 */
	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
	for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
		if ((!ACPI_COMPARE_NAME
		     (&(acpi_gbl_root_table_list.tables[i].signature),
		      ACPI_SIG_SSDT)
		     &&
		     !ACPI_COMPARE_NAME(&
					(acpi_gbl_root_table_list.tables[i].
					 signature), ACPI_SIG_PSDT))
		    ||
		    ACPI_FAILURE(acpi_tb_verify_table
				 (&acpi_gbl_root_table_list.tables[i]))) {
			continue;
		}

		if (no_auto_ssdt) {
			printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
			continue;
		}

		/* Ignore errors while loading tables, get as many as possible */

		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
		(void)acpi_ns_load_table(i, acpi_gbl_root_node);
		(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));

      unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_load_tables
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
 *
 ******************************************************************************/

acpi_status acpi_load_tables(void)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_load_tables);

	/*
	 * Load the namespace from the tables
	 */
	status = acpi_tb_load_namespace();
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"While loading namespace from ACPI tables"));
	}

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_load_tables)


static int __init acpi_no_auto_ssdt_setup(char *s) {

        printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");

        no_auto_ssdt = 1;

        return 1;
}

__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);