1 files changed, 351 insertions, 269 deletions

diff --git a/drivers/acpi/tables/tbxface.c b/drivers/acpi/tables/tbxface.c
index 5ba9303293ad..77439fc36c32 100644
--- a/drivers/acpi/tables/tbxface.c
+++ b/drivers/acpi/tables/tbxface.c
@@ -49,80 +49,146 @@
 #define _COMPONENT          ACPI_TABLES
 ACPI_MODULE_NAME("tbxface")
 
+/* Local prototypes */
+static acpi_status acpi_tb_load_namespace(void);
+
 /*******************************************************************************
  *
- * FUNCTION:    acpi_load_tables
+ * FUNCTION:    acpi_initialize_tables
  *
- * PARAMETERS:  None
+ * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
+ *                                    struct acpi_table_desc structures. If NULL, the
+ *                                    array is dynamically allocated.
+ *              initial_table_count - Size of initial_table_array, in number of
+ *                                    struct acpi_table_desc structures
+ *              allow_realloc       - Flag to tell Table Manager if resize of
+ *                                    pre-allocated array is allowed. Ignored
+ *                                    if initial_table_array is NULL.
  *
  * RETURN:      Status
  *
- * DESCRIPTION: This function is called to load the ACPI tables from the
- *              provided RSDT
+ * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
+ *
+ * NOTE:        Allows static allocation of the initial table array in order
+ *              to avoid the use of dynamic memory in confined environments
+ *              such as the kernel boot sequence where it may not be available.
+ *
+ *              If the host OS memory managers are initialized, use NULL for
+ *              initial_table_array, and the table will be dynamically allocated.
  *
  ******************************************************************************/
-acpi_status acpi_load_tables(void)
+
+acpi_status
+acpi_initialize_tables(struct acpi_table_desc *initial_table_array,
+		       u32 initial_table_count, u8 allow_resize)
 {
-	struct acpi_pointer rsdp_address;
+	acpi_physical_address address;
 	acpi_status status;
+	struct acpi_table_rsdp *rsdp;
 
-	ACPI_FUNCTION_TRACE(acpi_load_tables);
+	ACPI_FUNCTION_TRACE(acpi_initialize_tables);
 
-	/* Get the RSDP */
+	/*
+	 * Set up the Root Table Array
+	 * Allocate the table array if requested
+	 */
+	if (!initial_table_array) {
+		acpi_gbl_root_table_list.size = initial_table_count;
+		acpi_gbl_root_table_list.flags = ACPI_TABLE_FLAGS_ALLOW_RESIZE;
 
-	status = acpi_os_get_root_pointer(ACPI_LOGICAL_ADDRESSING,
-					  &rsdp_address);
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "Could not get the RSDP"));
-		goto error_exit;
+		status = acpi_tb_resize_root_table_list();
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	} else {
+		/* Root Table Array has been statically allocated by the host */
+
+		acpi_gbl_root_table_list.tables = initial_table_array;
+		acpi_gbl_root_table_list.size = initial_table_count;
+		acpi_gbl_root_table_list.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
+		if (allow_resize) {
+			acpi_gbl_root_table_list.flags =
+			    ACPI_TABLE_FLAGS_ALLOW_RESIZE;
+		}
 	}
 
-	/* Map and validate the RSDP */
+	/* Get the RSDP and map it */
 
-	acpi_gbl_table_flags = rsdp_address.pointer_type;
+	address = acpi_os_get_root_pointer();
+	if (!address) {
+		return_ACPI_STATUS(AE_NOT_FOUND);
+	}
 
-	status = acpi_tb_verify_rsdp(&rsdp_address);
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "During RSDP validation"));
-		goto error_exit;
+	rsdp = acpi_os_map_memory(address, sizeof(struct acpi_table_rsdp));
+	if (!rsdp) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
 	}
 
-	/* Get the RSDT via the RSDP */
+	ACPI_INFO((AE_INFO, "%.8s @ 0x%p",
+		   rsdp->signature, ACPI_CAST_PTR(void, address)));
 
-	status = acpi_tb_get_table_rsdt();
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "Could not load RSDT"));
-		goto error_exit;
-	}
+	/*
+	 * Get the root table (RSDT or XSDT) and extract all entries to the local
+	 * Root Table Array. This array contains the information of the RSDT/XSDT
+	 * in a common, more useable format.
+	 */
+	status = acpi_tb_parse_root_table(rsdp, ACPI_TABLE_ORIGIN_MAPPED);
+	acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
+	return_ACPI_STATUS(status);
+}
 
-	/* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
+ACPI_EXPORT_SYMBOL(acpi_initialize_tables)
 
-	status = acpi_tb_get_required_tables();
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status,
-				"Could not get all required tables (DSDT/FADT/FACS)"));
-		goto error_exit;
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_reallocate_root_table
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
+ *              root list from the previously provided scratch area. Should
+ *              be called once dynamic memory allocation is available in the
+ *              kernel
+ *
+ ******************************************************************************/
+acpi_status acpi_reallocate_root_table(void)
+{
+	struct acpi_table_desc *tables;
+	acpi_size new_size;
+
+	ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
+
+	/*
+	 * Only reallocate the root table if the host provided a static buffer
+	 * for the table array in the call to acpi_initialize_tables.
+	 */
+	if ((acpi_gbl_root_table_list.flags & ACPI_TABLE_ORIGIN_MASK) !=
+	    ACPI_TABLE_ORIGIN_UNKNOWN) {
+		return_ACPI_STATUS(AE_SUPPORT);
 	}
 
-	ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
+	new_size =
+	    (acpi_gbl_root_table_list.count +
+	     ACPI_ROOT_TABLE_SIZE_INCREMENT) * sizeof(struct acpi_table_desc);
 
-	/* Load the namespace from the tables */
+	/* Create new array and copy the old array */
 
-	status = acpi_ns_load_namespace();
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "Could not load namespace"));
-		goto error_exit;
+	tables = ACPI_ALLOCATE_ZEROED(new_size);
+	if (!tables) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
 	}
 
-	return_ACPI_STATUS(AE_OK);
+	ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, new_size);
 
-      error_exit:
-	ACPI_EXCEPTION((AE_INFO, status, "Could not load tables"));
-	return_ACPI_STATUS(status);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_load_tables)
+	acpi_gbl_root_table_list.size = acpi_gbl_root_table_list.count;
+	acpi_gbl_root_table_list.tables = tables;
+	acpi_gbl_root_table_list.flags =
+	    ACPI_TABLE_ORIGIN_ALLOCATED | ACPI_TABLE_FLAGS_ALLOW_RESIZE;
 
+	return_ACPI_STATUS(AE_OK);
+}
 /*******************************************************************************
  *
  * FUNCTION:    acpi_load_table
@@ -141,342 +207,358 @@ ACPI_EXPORT_SYMBOL(acpi_load_tables)
 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 {
 	acpi_status status;
-	struct acpi_table_desc table_info;
-	struct acpi_pointer address;
-
-	ACPI_FUNCTION_TRACE(acpi_load_table);
-
-	if (!table_ptr) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
+	acpi_native_uint table_index;
 
-	/* Copy the table to a local buffer */
-
-	address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
-	address.pointer.logical = table_ptr;
-
-	status = acpi_tb_get_table_body(&address, table_ptr, &table_info);
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
-
-	/* Check signature for a valid table type */
-
-	status = acpi_tb_recognize_table(&table_info, ACPI_TABLE_ALL);
+	/*
+	 * Install the new table into the local data structures
+	 */
+	status = acpi_tb_add_table(table_ptr, &table_index);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
+	status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
+	return_ACPI_STATUS(status);
+}
 
-	/* Install the new table into the local data structures */
-
-	status = acpi_tb_install_table(&table_info);
-	if (ACPI_FAILURE(status)) {
-		if (status == AE_ALREADY_EXISTS) {
+ACPI_EXPORT_SYMBOL(acpi_load_table)
 
-			/* Table already exists, no error */
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_get_table_header
+ *
+ * PARAMETERS:  Signature           - ACPI signature of needed table
+ *              Instance            - Which instance (for SSDTs)
+ *              out_table_header    - Where the pointer to the table header
+ *                                    is returned
+ *
+ * RETURN:      Status and pointer to mapped table header
+ *
+ * DESCRIPTION: Finds an ACPI table header.
+ *
+ * NOTE:        Caller is responsible in unmapping the header with
+ *              acpi_os_unmap_memory
+ *
+ *****************************************************************************/
+acpi_status
+acpi_get_table_header(char *signature,
+		      acpi_native_uint instance,
+		      struct acpi_table_header **out_table_header)
+{
+	acpi_native_uint i;
+	acpi_native_uint j;
 
-			status = AE_OK;
+	/*
+	 * 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;
 		}
 
-		/* Free table allocated by acpi_tb_get_table_body */
-
-		acpi_tb_delete_single_table(&table_info);
-		return_ACPI_STATUS(status);
-	}
-
-	/* Convert the table to common format if necessary */
-
-	switch (table_info.type) {
-	case ACPI_TABLE_ID_FADT:
-
-		status = acpi_tb_convert_table_fadt();
-		break;
-
-	case ACPI_TABLE_ID_FACS:
-
-		status = acpi_tb_build_common_facs(&table_info);
-		break;
-
-	default:
-		/* Load table into namespace if it contains executable AML */
-
-		status =
-		    acpi_ns_load_table(table_info.installed_desc,
-				       acpi_gbl_root_node);
-		break;
-	}
+		if (++j < instance) {
+			continue;
+		}
 
-	if (ACPI_FAILURE(status)) {
+		*out_table_header =
+		    acpi_tb_map(acpi_gbl_root_table_list.tables[i].address,
+				(u32) sizeof(struct acpi_table_header),
+				acpi_gbl_root_table_list.tables[i].
+				flags & ACPI_TABLE_ORIGIN_MASK);
 
-		/* Uninstall table and free the buffer */
+		if (!out_table_header) {
+			return (AE_NO_MEMORY);
+		}
 
-		(void)acpi_tb_uninstall_table(table_info.installed_desc);
+		return (AE_OK);
 	}
 
-	return_ACPI_STATUS(status);
+	return (AE_NOT_FOUND);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_load_table)
+ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 
-/*******************************************************************************
+
+/******************************************************************************
  *
  * FUNCTION:    acpi_unload_table_id
  *
- * PARAMETERS:  table_type    - Type of table to be unloaded
- *              id            - Owner ID of the table to be removed.
+ * 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_table_type table_type, acpi_owner_id id)
+acpi_status acpi_unload_table_id(acpi_owner_id id)
 {
-	struct acpi_table_desc *table_desc;
-	acpi_status status;
+	int i;
+	acpi_status status = AE_NOT_EXIST;
 
 	ACPI_FUNCTION_TRACE(acpi_unload_table);
 
-	/* Parameter validation */
-	if (table_type > ACPI_TABLE_ID_MAX)
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-
 	/* Find table from the requested type list */
-	table_desc = acpi_gbl_table_lists[table_type].next;
-	while (table_desc && table_desc->owner_id != id)
-		table_desc = table_desc->next;
-
-	if (!table_desc)
-		return_ACPI_STATUS(AE_NOT_EXIST);
-
-	/*
-	 * 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_ns_delete_namespace_by_owner(table_desc->owner_id);
-
-	status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
-	if (ACPI_FAILURE(status))
-		return_ACPI_STATUS(status);
-
-	(void)acpi_tb_uninstall_table(table_desc);
-
-	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
-
-	return_ACPI_STATUS(AE_OK);
+	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);
+		acpi_tb_release_owner_id(i);
+		acpi_tb_set_table_loaded_flag(i, FALSE);
+	}
+	return_ACPI_STATUS(status);
 }
 
 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
 
-#ifdef ACPI_FUTURE_USAGE
 /*******************************************************************************
  *
- * FUNCTION:    acpi_unload_table
+ * FUNCTION:    acpi_get_table
  *
- * PARAMETERS:  table_type    - Type of table to be unloaded
+ * PARAMETERS:  Signature           - ACPI signature of needed table
+ *              Instance            - Which instance (for SSDTs)
+ *              out_table           - Where the pointer to the table is returned
  *
- * RETURN:      Status
+ * RETURN:      Status and pointer to table
  *
- * DESCRIPTION: This routine is used to force the unload of a table
+ * DESCRIPTION: Finds and verifies an ACPI table.
  *
- ******************************************************************************/
-acpi_status acpi_unload_table(acpi_table_type table_type)
+ *****************************************************************************/
+acpi_status
+acpi_get_table(char *signature,
+	       acpi_native_uint instance, struct acpi_table_header ** out_table)
 {
-	struct acpi_table_desc *table_desc;
-
-	ACPI_FUNCTION_TRACE(acpi_unload_table);
-
-	/* Parameter validation */
+	acpi_native_uint i;
+	acpi_native_uint j;
+	acpi_status status;
 
-	if (table_type > ACPI_TABLE_ID_MAX) {
-		return_ACPI_STATUS(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;
+		}
 
-	/* Find all tables of the requested type */
+		if (++j < instance) {
+			continue;
+		}
 
-	table_desc = acpi_gbl_table_lists[table_type].next;
-	if (!table_desc) {
-		return_ACPI_STATUS(AE_NOT_EXIST);
-	}
+		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;
+		}
 
-	while (table_desc) {
-		/*
-		 * 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_ns_delete_namespace_by_owner(table_desc->owner_id);
-		table_desc = table_desc->next;
+		return (status);
 	}
 
-	/* Delete (or unmap) all tables of this type */
-
-	acpi_tb_delete_tables_by_type(table_type);
-	return_ACPI_STATUS(AE_OK);
+	return (AE_NOT_FOUND);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_unload_table)
+ACPI_EXPORT_SYMBOL(acpi_get_table)
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_get_table_header
+ * FUNCTION:    acpi_get_table_by_index
  *
- * PARAMETERS:  table_type      - one of the defined table types
- *              Instance        - the non zero instance of the table, allows
- *                                support for multiple tables of the same type
- *                                see acpi_gbl_acpi_table_flag
- *              out_table_header - pointer to the struct acpi_table_header if successful
+ * PARAMETERS:  table_index         - Table index
+ *              Table               - Where the pointer to the table is returned
  *
- * DESCRIPTION: This function is called to get an ACPI table header. The caller
- *              supplies an pointer to a data area sufficient to contain an ACPI
- *              struct acpi_table_header structure.
+ * RETURN:      Status and pointer to the table
  *
- *              The header contains a length field that can be used to determine
- *              the size of the buffer needed to contain the entire table. This
- *              function is not valid for the RSD PTR table since it does not
- *              have a standard header and is fixed length.
+ * DESCRIPTION: Obtain a table by an index into the global table list.
  *
  ******************************************************************************/
 acpi_status
-acpi_get_table_header(acpi_table_type table_type,
-		      u32 instance, struct acpi_table_header *out_table_header)
+acpi_get_table_by_index(acpi_native_uint table_index,
+			struct acpi_table_header ** table)
 {
-	struct acpi_table_header *tbl_ptr;
 	acpi_status status;
 
-	ACPI_FUNCTION_TRACE(acpi_get_table_header);
+	ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 
-	if ((instance == 0) ||
-	    (table_type == ACPI_TABLE_ID_RSDP) || (!out_table_header)) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 
-	/* Check the table type and instance */
+	/* Validate index */
 
-	if ((table_type > ACPI_TABLE_ID_MAX) ||
-	    (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
-	     instance > 1)) {
+	if (table_index >= acpi_gbl_root_table_list.count) {
+		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
 
-	/* Get a pointer to the entire table */
+	if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 
-	status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
+		/* Table is not mapped, map it */
 
-	/* The function will return a NULL pointer if the table is not loaded */
-
-	if (tbl_ptr == NULL) {
-		return_ACPI_STATUS(AE_NOT_EXIST);
+		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);
+		}
 	}
 
-	/* Copy the header to the caller's buffer */
-
-	ACPI_MEMCPY(ACPI_CAST_PTR(void, out_table_header),
-		    ACPI_CAST_PTR(void, tbl_ptr),
-		    sizeof(struct acpi_table_header));
-
-	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_header)
-#endif				/*  ACPI_FUTURE_USAGE  */
+ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_get_table
+ * FUNCTION:    acpi_tb_load_namespace
  *
- * PARAMETERS:  table_type      - one of the defined table types
- *              Instance        - the non zero instance of the table, allows
- *                                support for multiple tables of the same type
- *                                see acpi_gbl_acpi_table_flag
- *              ret_buffer      - pointer to a structure containing a buffer to
- *                                receive the table
+ * PARAMETERS:  None
  *
  * RETURN:      Status
  *
- * DESCRIPTION: This function is called to get an ACPI table. The caller
- *              supplies an out_buffer large enough to contain the entire ACPI
- *              table. The caller should call the acpi_get_table_header function
- *              first to determine the buffer size needed. Upon completion
- *              the out_buffer->Length field will indicate the number of bytes
- *              copied into the out_buffer->buf_ptr buffer. This table will be
- *              a complete table including the header.
+ * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
+ *              the RSDT/XSDT.
  *
  ******************************************************************************/
-acpi_status
-acpi_get_table(acpi_table_type table_type,
-	       u32 instance, struct acpi_buffer *ret_buffer)
+static acpi_status acpi_tb_load_namespace(void)
 {
-	struct acpi_table_header *tbl_ptr;
 	acpi_status status;
-	acpi_size table_length;
+	struct acpi_table_header *table;
+	acpi_native_uint i;
 
-	ACPI_FUNCTION_TRACE(acpi_get_table);
+	ACPI_FUNCTION_TRACE(tb_load_namespace);
 
-	/* Parameter validation */
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 
-	if (instance == 0) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	/*
+	 * 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;
 	}
 
-	status = acpi_ut_validate_buffer(ret_buffer);
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
+	/*
+	 * 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_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);
 	}
 
-	/* Check the table type and instance */
+	status =
+	    acpi_tb_verify_table(&acpi_gbl_root_table_list.
+				 tables[ACPI_TABLE_INDEX_DSDT]);
+	if (ACPI_FAILURE(status)) {
+
+		/* A valid DSDT is required */
 
-	if ((table_type > ACPI_TABLE_ID_MAX) ||
-	    (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
-	     instance > 1)) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
+		status = AE_NO_ACPI_TABLES;
+		goto unlock_and_exit;
 	}
 
-	/* Get a pointer to the entire table */
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 
-	status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
+	/*
+	 * 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);
 	}
 
 	/*
-	 * acpi_tb_get_table_ptr will return a NULL pointer if the
-	 * table is not loaded.
+	 * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
 	 */
-	if (tbl_ptr == NULL) {
-		return_ACPI_STATUS(AE_NOT_EXIST);
+	(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;
+		}
+
+		/* 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);
 	}
 
-	/* Get the table length */
+	ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 
-	if (table_type == ACPI_TABLE_ID_RSDP) {
+      unlock_and_exit:
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+	return_ACPI_STATUS(status);
+}
 
-		/* RSD PTR is the only "table" without a header */
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_load_tables
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
+ *
+ ******************************************************************************/
 
-		table_length = sizeof(struct rsdp_descriptor);
-	} else {
-		table_length = (acpi_size) tbl_ptr->length;
-	}
+acpi_status acpi_load_tables(void)
+{
+	acpi_status status;
 
-	/* Validate/Allocate/Clear caller buffer */
+	ACPI_FUNCTION_TRACE(acpi_load_tables);
 
-	status = acpi_ut_initialize_buffer(ret_buffer, table_length);
+	/*
+	 * Load the namespace from the tables
+	 */
+	status = acpi_tb_load_namespace();
 	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
+		ACPI_EXCEPTION((AE_INFO, status,
+				"While loading namespace from ACPI tables"));
 	}
 
-	/* Copy the table to the buffer */
-
-	ACPI_MEMCPY(ACPI_CAST_PTR(void, ret_buffer->pointer),
-		    ACPI_CAST_PTR(void, tbl_ptr), table_length);
-
-	return_ACPI_STATUS(AE_OK);
+	return_ACPI_STATUS(status);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_get_table)
+ACPI_EXPORT_SYMBOL(acpi_load_tables)