ACPI: ACPICA 20060623

Implemented a new acpi_spinlock type for the OSL lock
interfaces. This allows the type to be customized to
the host OS for improved efficiency (since a spinlock is
usually a very small object.)

Implemented support for "ignored" bits in the ACPI
registers. According to the ACPI specification, these
bits should be preserved when writing the registers via
a read/modify/write cycle. There are 3 bits preserved
in this manner: PM1_CONTROL[0] (SCI_EN), PM1_CONTROL[9],
and PM1_STATUS[11].
http://bugzilla.kernel.org/show_bug.cgi?id=3691

Implemented the initial deployment of new OSL mutex
interfaces. Since some host operating systems have
separate mutex and semaphore objects, this feature was
requested. The base code now uses mutexes (and the new
mutex interfaces) wherever a binary semaphore was used
previously. However, for the current release, the mutex
interfaces are defined as macros to map them to the
existing semaphore interfaces.

Fixed several problems with the support for the control
method SyncLevel parameter. The SyncLevel now works
according to the ACPI specification and in concert with the
Mutex SyncLevel parameter, since the current SyncLevel is
a property of the executing thread. Mutual exclusion for
control methods is now implemented with a mutex instead
of a semaphore.

Fixed three instances of the use of the C shift operator
in the bitfield support code (exfldio.c) to avoid the use
of a shift value larger than the target data width. The
behavior of C compilers is undefined in this case and can
cause unpredictable results, and therefore the case must
be detected and avoided. (Fiodor Suietov)

Added an info message whenever an SSDT or OEM table
is loaded dynamically via the Load() or LoadTable()
ASL operators. This should improve debugging capability
since it will show exactly what tables have been loaded
(beyond the tables present in the RSDT/XSDT.)

Signed-off-by: Bob Moore <[e-mail]>
Signed-off-by: Len Brown <[e-mail]>

drivers/acpi/dispatcher/dsinit.c

···
 		if (info->table_desc->pointer->revision == 1) {
 			node->flags |= ANOBJ_DATA_WIDTH_32;
 		}
-#ifdef ACPI_INIT_PARSE_METHODS
-		/*
-		 * Note 11/2005: Removed this code to parse all methods during table
-		 * load because it causes problems if there are any errors during the
-		 * parse. Also, it seems like overkill and we probably don't want to
-		 * abort a table load because of an issue with a single method.
-		 */
 
-		/*
-		 * Print a dot for each method unless we are going to print
-		 * the entire pathname
-		 */
-		if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
-			ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
-		}
-
-		/*
-		 * Always parse methods to detect errors, we will delete
-		 * the parse tree below
-		 */
-		status = acpi_ds_parse_method(obj_handle);
-		if (ACPI_FAILURE(status)) {
-			ACPI_ERROR((AE_INFO,
-				    "Method %p [%4.4s] - parse failure, %s",
-				    obj_handle,
-				    acpi_ut_get_node_name(obj_handle),
-				    acpi_format_exception(status)));
-
-			/* This parse failed, but we will continue parsing more methods */
-		}
-#endif
 		info->method_count++;
 		break;
 

drivers/acpi/dispatcher/dsmethod.c

···
 #define _COMPONENT          ACPI_DISPATCHER
 ACPI_MODULE_NAME("dsmethod")
 
+/* Local prototypes */
+static acpi_status
+acpi_ds_create_method_mutex(union acpi_operand_object *method_desc);
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ds_method_error
···
  *              Note: Allows the exception handler to change the status code
  *
  ******************************************************************************/
+
 acpi_status
 acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state)
 {
···
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ds_create_method_mutex
+ *
+ * PARAMETERS:  obj_desc            - The method object
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Create a mutex object for a serialized control method
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ds_create_method_mutex(union acpi_operand_object *method_desc)
+{
+	union acpi_operand_object *mutex_desc;
+	acpi_status status;
+
+	ACPI_FUNCTION_NAME(ds_create_method_mutex);
+
+	/* Create the new mutex object */
+
+	mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
+	if (!mutex_desc) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	/* Create the actual OS Mutex */
+
+	status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	mutex_desc->mutex.sync_level = method_desc->method.sync_level;
+	method_desc->method.mutex = mutex_desc;
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ds_begin_method_execution
  *
  * PARAMETERS:  method_node         - Node of the method
  *              obj_desc            - The method object
- *              calling_method_node - Caller of this method (if non-null)
+ *              walk_state          - current state, NULL if not yet executing
+ *                                    a method.
  *
  * RETURN:      Status
  *
···
  ******************************************************************************/
 
 acpi_status
-acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
-			       union acpi_operand_object * obj_desc,
-			       struct acpi_namespace_node * calling_method_node)
+acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
+			       union acpi_operand_object *obj_desc,
+			       struct acpi_walk_state *walk_state)
 {
 	acpi_status status = AE_OK;
 
···
 	}
 
 	/*
-	 * If there is a concurrency limit on this method, we need to
-	 * obtain a unit from the method semaphore.
+	 * If this method is serialized, we need to acquire the method mutex.
 	 */
-	if (obj_desc->method.semaphore) {
+	if (obj_desc->method.method_flags & AML_METHOD_SERIALIZED) {
 		/*
-		 * Allow recursive method calls, up to the reentrancy/concurrency
-		 * limit imposed by the SERIALIZED rule and the sync_level method
-		 * parameter.
-		 *
-		 * The point of this code is to avoid permanently blocking a
-		 * thread that is making recursive method calls.
+		 * Create a mutex for the method if it is defined to be Serialized
+		 * and a mutex has not already been created. We defer the mutex creation
+		 * until a method is actually executed, to minimize the object count
 		 */
-		if (method_node == calling_method_node) {
-			if (obj_desc->method.thread_count >=
-			    obj_desc->method.concurrency) {
-				return_ACPI_STATUS(AE_AML_METHOD_LIMIT);
+		if (!obj_desc->method.mutex) {
+			status = acpi_ds_create_method_mutex(obj_desc);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
 			}
 		}
 
 		/*
-		 * Get a unit from the method semaphore. This releases the
-		 * interpreter if we block (then reacquires it)
+		 * The current_sync_level (per-thread) must be less than or equal to
+		 * the sync level of the method. This mechanism provides some
+		 * deadlock prevention
+		 *
+		 * Top-level method invocation has no walk state at this point
 		 */
-		status =
-		    acpi_ex_system_wait_semaphore(obj_desc->method.semaphore,
-						  ACPI_WAIT_FOREVER);
-		if (ACPI_FAILURE(status)) {
-			return_ACPI_STATUS(status);
+		if (walk_state &&
+		    (walk_state->thread->current_sync_level >
+		     obj_desc->method.mutex->mutex.sync_level)) {
+			ACPI_ERROR((AE_INFO,
+				    "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%d)",
+				    acpi_ut_get_node_name(method_node),
+				    walk_state->thread->current_sync_level));
+
+			return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
 		}
+
+		/*
+		 * Obtain the method mutex if necessary. Do not acquire mutex for a
+		 * recursive call.
+		 */
+		if (!walk_state ||
+		    !obj_desc->method.mutex->mutex.owner_thread ||
+		    (walk_state->thread !=
+		     obj_desc->method.mutex->mutex.owner_thread)) {
+			/*
+			 * Acquire the method mutex. This releases the interpreter if we
+			 * block (and reacquires it before it returns)
+			 */
+			status =
+			    acpi_ex_system_wait_mutex(obj_desc->method.mutex->
+						      mutex.os_mutex,
+						      ACPI_WAIT_FOREVER);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
+			}
+
+			/* Update the mutex and walk info and save the original sync_level */
+
+			if (walk_state) {
+				obj_desc->method.mutex->mutex.
+				    original_sync_level =
+				    walk_state->thread->current_sync_level;
+
+				obj_desc->method.mutex->mutex.owner_thread =
+				    walk_state->thread;
+				walk_state->thread->current_sync_level =
+				    obj_desc->method.sync_level;
+			} else {
+				obj_desc->method.mutex->mutex.
+				    original_sync_level =
+				    obj_desc->method.mutex->mutex.sync_level;
+			}
+		}
+
+		/* Always increase acquisition depth */
+
+		obj_desc->method.mutex->mutex.acquisition_depth++;
 	}
 
 	/*
···
 	return_ACPI_STATUS(status);
 
       cleanup:
-	/* On error, must signal the method semaphore if present */
+	/* On error, must release the method mutex (if present) */
 
-	if (obj_desc->method.semaphore) {
-		(void)acpi_os_signal_semaphore(obj_desc->method.semaphore, 1);
+	if (obj_desc->method.mutex) {
+		acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex);
 	}
 	return_ACPI_STATUS(status);
 }
···
 		return_ACPI_STATUS(AE_NULL_OBJECT);
 	}
 
-	/* Init for new method, possibly wait on concurrency semaphore */
+	/* Init for new method, possibly wait on method mutex */
 
 	status = acpi_ds_begin_method_execution(method_node, obj_desc,
-						this_walk_state->method_node);
+						this_walk_state);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
···
  *              created, delete all locals and arguments, and delete the parse
  *              tree if requested.
  *
+ * MUTEX:       Interpreter is locked
+ *
  ******************************************************************************/
 
 void
···
 	}
 
 	/*
-	 * Lock the parser while we terminate this method.
-	 * If this is the last thread executing the method,
-	 * we have additional cleanup to perform
+	 * If method is serialized, release the mutex and restore the
+	 * current sync level for this thread
 	 */
-	status = acpi_ut_acquire_mutex(ACPI_MTX_CONTROL_METHOD);
-	if (ACPI_FAILURE(status)) {
-		return_VOID;
-	}
+	if (method_desc->method.mutex) {
 
-	/* Signal completion of the execution of this method if necessary */
+		/* Acquisition Depth handles recursive calls */
 
-	if (method_desc->method.semaphore) {
-		status =
-		    acpi_os_signal_semaphore(method_desc->method.semaphore, 1);
-		if (ACPI_FAILURE(status)) {
+		method_desc->method.mutex->mutex.acquisition_depth--;
+		if (!method_desc->method.mutex->mutex.acquisition_depth) {
+			walk_state->thread->current_sync_level =
+			    method_desc->method.mutex->mutex.
+			    original_sync_level;
 
-			/* Ignore error and continue */
-
-			ACPI_EXCEPTION((AE_INFO, status,
-					"Could not signal method semaphore"));
+			acpi_os_release_mutex(method_desc->method.mutex->mutex.
+					      os_mutex);
 		}
 	}
 
···
 
 		status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 		if (ACPI_FAILURE(status)) {
-			goto exit;
+			return_VOID;
 		}
 
 		/*
···
 		/*
 		 * Support to dynamically change a method from not_serialized to
 		 * Serialized if it appears that the method is incorrectly written and
-		 * does not support multiple thread execution.  The best example of this
-		 * is if such a method creates namespace objects and blocks.  A second
+		 * does not support multiple thread execution. The best example of this
+		 * is if such a method creates namespace objects and blocks. A second
 		 * thread will fail with an AE_ALREADY_EXISTS exception
 		 *
 		 * This code is here because we must wait until the last thread exits
 		 * before creating the synchronization semaphore.
 		 */
-		if ((method_desc->method.concurrency == 1) &&
-		    (!method_desc->method.semaphore)) {
-			status = acpi_os_create_semaphore(1, 1,
-							  &method_desc->method.
-							  semaphore);
+		if ((method_desc->method.method_flags & AML_METHOD_SERIALIZED)
+		    && (!method_desc->method.mutex)) {
+			status = acpi_ds_create_method_mutex(method_desc);
 		}
 
 		/* No more threads, we can free the owner_id */
···
 		acpi_ut_release_owner_id(&method_desc->method.owner_id);
 	}
 
-      exit:
-	(void)acpi_ut_release_mutex(ACPI_MTX_CONTROL_METHOD);
 	return_VOID;
 }
-
-#ifdef ACPI_INIT_PARSE_METHODS
-	/*
-	 * Note 11/2005: Removed this code to parse all methods during table
-	 * load because it causes problems if there are any errors during the
-	 * parse. Also, it seems like overkill and we probably don't want to
-	 * abort a table load because of an issue with a single method.
-	 */
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_ds_parse_method
- *
- * PARAMETERS:  Node        - Method node
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Parse the AML that is associated with the method.
- *
- * MUTEX:       Assumes parser is locked
- *
- ******************************************************************************/
-
-acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node)
-{
-	acpi_status status;
-	union acpi_operand_object *obj_desc;
-	union acpi_parse_object *op;
-	struct acpi_walk_state *walk_state;
-
-	ACPI_FUNCTION_TRACE_PTR(ds_parse_method, node);
-
-	/* Parameter Validation */
-
-	if (!node) {
-		return_ACPI_STATUS(AE_NULL_ENTRY);
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-			  "**** Parsing [%4.4s] **** NamedObj=%p\n",
-			  acpi_ut_get_node_name(node), node));
-
-	/* Extract the method object from the method Node */
-
-	obj_desc = acpi_ns_get_attached_object(node);
-	if (!obj_desc) {
-		return_ACPI_STATUS(AE_NULL_OBJECT);
-	}
-
-	/* Create a mutex for the method if there is a concurrency limit */
-
-	if ((obj_desc->method.concurrency != ACPI_INFINITE_CONCURRENCY) &&
-	    (!obj_desc->method.semaphore)) {
-		status = acpi_os_create_semaphore(obj_desc->method.concurrency,
-						  obj_desc->method.concurrency,
-						  &obj_desc->method.semaphore);
-		if (ACPI_FAILURE(status)) {
-			return_ACPI_STATUS(status);
-		}
-	}
-
-	/*
-	 * Allocate a new parser op to be the root of the parsed
-	 * method tree
-	 */
-	op = acpi_ps_alloc_op(AML_METHOD_OP);
-	if (!op) {
-		return_ACPI_STATUS(AE_NO_MEMORY);
-	}
-
-	/* Init new op with the method name and pointer back to the Node */
-
-	acpi_ps_set_name(op, node->name.integer);
-	op->common.node = node;
-
-	/*
-	 * Get a new owner_id for objects created by this method. Namespace
-	 * objects (such as Operation Regions) can be created during the
-	 * first pass parse.
-	 */
-	status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id);
-	if (ACPI_FAILURE(status)) {
-		goto cleanup;
-	}
-
-	/* Create and initialize a new walk state */
-
-	walk_state =
-	    acpi_ds_create_walk_state(obj_desc->method.owner_id, NULL, NULL,
-				      NULL);
-	if (!walk_state) {
-		status = AE_NO_MEMORY;
-		goto cleanup2;
-	}
-
-	status = acpi_ds_init_aml_walk(walk_state, op, node,
-				       obj_desc->method.aml_start,
-				       obj_desc->method.aml_length, NULL, 1);
-	if (ACPI_FAILURE(status)) {
-		acpi_ds_delete_walk_state(walk_state);
-		goto cleanup2;
-	}
-
-	/*
-	 * Parse the method, first pass
-	 *
-	 * The first pass load is where newly declared named objects are added into
-	 * the namespace.  Actual evaluation of the named objects (what would be
-	 * called a "second pass") happens during the actual execution of the
-	 * method so that operands to the named objects can take on dynamic
-	 * run-time values.
-	 */
-	status = acpi_ps_parse_aml(walk_state);
-	if (ACPI_FAILURE(status)) {
-		goto cleanup2;
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-			  "**** [%4.4s] Parsed **** NamedObj=%p Op=%p\n",
-			  acpi_ut_get_node_name(node), node, op));
-
-	/*
-	 * Delete the parse tree. We simply re-parse the method for every
-	 * execution since there isn't much overhead (compared to keeping lots
-	 * of parse trees around)
-	 */
-	acpi_ns_delete_namespace_subtree(node);
-	acpi_ns_delete_namespace_by_owner(obj_desc->method.owner_id);
-
-      cleanup2:
-	acpi_ut_release_owner_id(&obj_desc->method.owner_id);
-
-      cleanup:
-	acpi_ps_delete_parse_tree(op);
-	return_ACPI_STATUS(status);
-}
-#endif

drivers/acpi/dispatcher/dswexec.c

···
 			    acpi_ds_result_push(walk_state->result_obj,
 						walk_state);
 		}
-
 		break;
 
 	default:
···
 				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 						  "Method Reference in a Package, Op=%p\n",
 						  op));
+
 				op->common.node =
 				    (struct acpi_namespace_node *)op->asl.value.
 				    arg->asl.node->object;
···
 
 				status = acpi_ds_result_stack_pop(walk_state);
 			}
-
 			break;
 
 		case AML_TYPE_UNDEFINED:
···
 	 * Check if we just completed the evaluation of a
 	 * conditional predicate
 	 */
-
 	if ((ACPI_SUCCESS(status)) &&
 	    (walk_state->control_state) &&
 	    (walk_state->control_state->common.state ==

drivers/acpi/dispatcher/dswload.c

···
 		if (status == AE_NOT_FOUND) {
 			/*
 			 * Table disassembly:
-			 * Target of Scope() not found.  Generate an External for it, and
+			 * Target of Scope() not found. Generate an External for it, and
 			 * insert the name into the namespace.
 			 */
 			acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
···
 		case ACPI_TYPE_BUFFER:
 
 			/*
-			 * These types we will allow, but we will change the type.  This
+			 * These types we will allow, but we will change the type. This
 			 * enables some existing code of the form:
 			 *
 			 *  Name (DEB, 0)
 			 *  Scope (DEB) { ... }
 			 *
-			 * Note: silently change the type here.  On the second pass, we will report
+			 * Note: silently change the type here. On the second pass, we will report
 			 * a warning
 			 */
-
 			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 					  "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)\n",
 					  path,
···
 		break;
 
 	default:
-
 		/*
 		 * For all other named opcodes, we will enter the name into
 		 * the namespace.
···
 		 *       buffer_field, or Package), the name of the object is already
 		 *       in the namespace.
 		 */
-
 		if (walk_state->deferred_node) {
 
 			/* This name is already in the namespace, get the node */
···
 		}
 
 		/*
-		 * Enter the named type into the internal namespace.  We enter the name
-		 * as we go downward in the parse tree.  Any necessary subobjects that
+		 * Enter the named type into the internal namespace. We enter the name
+		 * as we go downward in the parse tree. Any necessary subobjects that
 		 * involve arguments to the opcode must be created as we go back up the
 		 * parse tree later.
 		 */
···
 							    (status);
 						}
 					}
+
 					status = AE_OK;
 				}
 			}
 
 			if (ACPI_FAILURE(status)) {
-
 				ACPI_ERROR_NAMESPACE(path, status);
 				return_ACPI_STATUS(status);
 			}
···
 			status =
 			    acpi_ex_create_region(op->named.data,
 						  op->named.length,
-						  (acpi_adr_space_type)
-						  ((op->common.value.arg)->
-						   common.value.integer),
+						  (acpi_adr_space_type) ((op->
+									  common.
+									  value.
+									  arg)->
+									 common.
+									 value.
+									 integer),
 						  walk_state);
 			if (ACPI_FAILURE(status)) {
 				return_ACPI_STATUS(status);
···
 			 * method_op pkg_length name_string method_flags term_list
 			 *
 			 * Note: We must create the method node/object pair as soon as we
-			 * see the method declaration.  This allows later pass1 parsing
+			 * see the method declaration. This allows later pass1 parsing
 			 * of invocations of the method (need to know the number of
 			 * arguments.)
 			 */
···
 								  length,
 								  walk_state);
 				}
+
 				walk_state->operands[0] = NULL;
 				walk_state->num_operands = 0;
 
···
 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 			if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 			    (walk_state->op_info->class == AML_CLASS_CONTROL)) {
-
 				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 						  "Begin/EXEC: %s (fl %8.8X)\n",
 						  walk_state->op_info->name,
···
 		} else {
 			/* Get name from the op */
 
-			buffer_ptr = (char *)&op->named.name;
+			buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 		}
 	} else {
 		/* Get the namestring from the raw AML */
···
 		break;
 
 	case AML_INT_NAMEPATH_OP:
-
 		/*
 		 * The name_path is an object reference to an existing object.
 		 * Don't enter the name into the namespace, but look it up
···
 		break;
 
 	case AML_SCOPE_OP:
-
 		/*
 		 * The Path is an object reference to an existing object.
 		 * Don't enter the name into the namespace, but look it up
···
 #endif
 			return_ACPI_STATUS(status);
 		}
+
 		/*
 		 * We must check to make sure that the target is
 		 * one of the opcodes that actually opens a scope
···
 		case ACPI_TYPE_BUFFER:
 
 			/*
-			 * These types we will allow, but we will change the type.  This
+			 * These types we will allow, but we will change the type. This
 			 * enables some existing code of the form:
 			 *
 			 *  Name (DEB, 0)
 			 *  Scope (DEB) { ... }
 			 */
-
 			ACPI_WARNING((AE_INFO,
 				      "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)",
 				      buffer_ptr,
···
 				if (ACPI_FAILURE(status)) {
 					return_ACPI_STATUS(status);
 				}
-
 			}
+
 			return_ACPI_STATUS(AE_OK);
 		}
 
 		/*
-		 * Enter the named type into the internal namespace.  We enter the name
-		 * as we go downward in the parse tree.  Any necessary subobjects that
+		 * Enter the named type into the internal namespace. We enter the name
+		 * as we go downward in the parse tree. Any necessary subobjects that
 		 * involve arguments to the opcode must be created as we go back up the
 		 * parse tree later.
 		 *
···
 	 * can get it again quickly when this scope is closed
 	 */
 	op->common.node = node;
-
 	return_ACPI_STATUS(status);
 }
 
···
 #ifndef ACPI_NO_METHOD_EXECUTION
 
 	case AML_TYPE_CREATE_FIELD:
-
 		/*
 		 * Create the field object, but the field buffer and index must
 		 * be evaluated later during the execution phase
···
 		break;
 
 	case AML_TYPE_NAMED_FIELD:
-
 		/*
 		 * If we are executing a method, initialize the field
 		 */
···
 			 * argument is the space_id. (We must save the address of the
 			 * AML of the address and length operands)
 			 */
+
 			/*
 			 * If we have a valid region, initialize it
 			 * Namespace is NOT locked at this point.
···
 			 * method_op pkg_length name_string method_flags term_list
 			 *
 			 * Note: We must create the method node/object pair as soon as we
-			 * see the method declaration.  This allows later pass1 parsing
+			 * see the method declaration. This allows later pass1 parsing
 			 * of invocations of the method (need to know the number of
 			 * arguments.)
 			 */

drivers/acpi/events/evgpe.c

···
 	u32 status_reg;
 	u32 enable_reg;
 	acpi_cpu_flags flags;
-	acpi_cpu_flags hw_flags;
 	acpi_native_uint i;
 	acpi_native_uint j;
 
···
 		return (int_status);
 	}
 
-	/* We need to hold the GPE lock now, hardware lock in the loop */
-
+	/*
+	 * We need to obtain the GPE lock for both the data structs and registers
+	 * Note: Not necessary to obtain the hardware lock, since the GPE registers
+	 * are owned by the gpe_lock.
+	 */
 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 
 	/* Examine all GPE blocks attached to this interrupt level */
···
 
 			gpe_register_info = &gpe_block->register_info[i];
 
-			hw_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-
 			/* Read the Status Register */
 
 			status =
···
 						   &gpe_register_info->
 						   status_address);
 			if (ACPI_FAILURE(status)) {
-				acpi_os_release_lock(acpi_gbl_hardware_lock,
-						     hw_flags);
 				goto unlock_and_exit;
 			}
 
···
 						   &enable_reg,
 						   &gpe_register_info->
 						   enable_address);
-			acpi_os_release_lock(acpi_gbl_hardware_lock, hw_flags);
-
 			if (ACPI_FAILURE(status)) {
 				goto unlock_and_exit;
 			}

drivers/acpi/executer/exconfig.c

···
 		}
 	}
 
+	ACPI_INFO((AE_INFO,
+		   "Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
+		   table->signature, table->oem_id, table->oem_table_id));
+
 	*return_desc = ddb_handle;
 	return_ACPI_STATUS(status);
 }
···
 
 		return_ACPI_STATUS(status);
 	}
+
+	ACPI_INFO((AE_INFO,
+		   "Dynamic SSDT Load - OemId [%6.6s] OemTableId [%8.8s]",
+		   table_ptr->oem_id, table_ptr->oem_table_id));
 
       cleanup:
 	if (ACPI_FAILURE(status)) {

drivers/acpi/executer/excreate.c

···
 	 * that the event is created in an unsignalled state
 	 */
 	status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
-					  &obj_desc->event.semaphore);
+					  &obj_desc->event.os_semaphore);
 	if (ACPI_FAILURE(status)) {
 		goto cleanup;
 	}
···
 		goto cleanup;
 	}
 
-	/*
-	 * Create the actual OS semaphore.
-	 * One unit max to make it a mutex, with one initial unit to allow
-	 * the mutex to be acquired.
-	 */
-	status = acpi_os_create_semaphore(1, 1, &obj_desc->mutex.semaphore);
+	/* Create the actual OS Mutex */
+
+	status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
 	if (ACPI_FAILURE(status)) {
 		goto cleanup;
 	}
···
 	obj_desc->method.aml_length = aml_length;
 
 	/*
-	 * Disassemble the method flags.  Split off the Arg Count
+	 * Disassemble the method flags. Split off the Arg Count
 	 * for efficiency
 	 */
 	method_flags = (u8) operand[1]->integer.value;
···
 	    (u8) (method_flags & AML_METHOD_ARG_COUNT);
 
 	/*
-	 * Get the concurrency count.  If required, a semaphore will be
+	 * Get the sync_level. If method is serialized, a mutex will be
 	 * created for this method when it is parsed.
 	 */
 	if (acpi_gbl_all_methods_serialized) {
-		obj_desc->method.concurrency = 1;
+		obj_desc->method.sync_level = 0;
 		obj_desc->method.method_flags |= AML_METHOD_SERIALIZED;
 	} else if (method_flags & AML_METHOD_SERIALIZED) {
 		/*
-		 * ACPI 1.0: Concurrency = 1
-		 * ACPI 2.0: Concurrency = (sync_level (in method declaration) + 1)
+		 * ACPI 1.0: sync_level = 0
+		 * ACPI 2.0: sync_level = sync_level in method declaration
 		 */
-		obj_desc->method.concurrency = (u8)
-		    (((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4) + 1);
-	} else {
-		obj_desc->method.concurrency = ACPI_INFINITE_CONCURRENCY;
+		obj_desc->method.sync_level = (u8)
+		    ((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4);
 	}
 
 	/* Attach the new object to the method Node */

drivers/acpi/executer/exdump.c

···
 
 static struct acpi_exdump_info acpi_ex_dump_event[2] = {
 	{ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_event), NULL},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(event.semaphore), "Semaphore"}
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(event.os_semaphore), "OsSemaphore"}
 };
 
 static struct acpi_exdump_info acpi_ex_dump_method[8] = {
 	{ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_method), NULL},
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.param_count), "ParamCount"},
-	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.concurrency), "Concurrency"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(method.semaphore), "Semaphore"},
+	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.sync_level), "Sync Level"},
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(method.mutex), "Mutex"},
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.owner_id), "Owner Id"},
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.thread_count), "Thread Count"},
 	{ACPI_EXD_UINT32, ACPI_EXD_OFFSET(method.aml_length), "Aml Length"},
···
 	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.owner_thread), "Owner Thread"},
 	{ACPI_EXD_UINT16, ACPI_EXD_OFFSET(mutex.acquisition_depth),
 	 "Acquire Depth"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.semaphore), "Semaphore"}
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.os_mutex), "OsMutex"}
 };
 
 static struct acpi_exdump_info acpi_ex_dump_region[7] = {

drivers/acpi/executer/exfldio.c

···
 			return_ACPI_STATUS(status);
 		}
 
-		/* Merge with previous datum if necessary */
-
-		merged_datum |= raw_datum <<
-		    (obj_desc->common_field.access_bit_width -
-		     obj_desc->common_field.start_field_bit_offset);
+		/*
+		 * Merge with previous datum if necessary.
+		 *
+		 * Note: Before the shift, check if the shift value will be larger than
+		 * the integer size. If so, there is no need to perform the operation.
+		 * This avoids the differences in behavior between different compilers
+		 * concerning shift values larger than the target data width.
+		 */
+		if ((obj_desc->common_field.access_bit_width -
+		     obj_desc->common_field.start_field_bit_offset) <
+		    ACPI_INTEGER_BIT_SIZE) {
+			merged_datum |=
+			    raw_datum << (obj_desc->common_field.
+					  access_bit_width -
+					  obj_desc->common_field.
+					  start_field_bit_offset);
+		}
 
 		if (i == datum_count) {
 			break;
···
 		return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
 	}
 
-	/* Compute the number of datums (access width data items) */
+	/*
+	 * Create the bitmasks used for bit insertion.
+	 * Note: This if/else is used to bypass compiler differences with the
+	 * shift operator
+	 */
+	if (obj_desc->common_field.access_bit_width == ACPI_INTEGER_BIT_SIZE) {
+		width_mask = ACPI_INTEGER_MAX;
+	} else {
+		width_mask =
+		    ACPI_MASK_BITS_ABOVE(obj_desc->common_field.
+					 access_bit_width);
+	}
 
-	width_mask =
-	    ACPI_MASK_BITS_ABOVE(obj_desc->common_field.access_bit_width);
-	mask =
-	    width_mask & ACPI_MASK_BITS_BELOW(obj_desc->common_field.
-					      start_field_bit_offset);
+	mask = width_mask &
+	    ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset);
+
+	/* Compute the number of datums (access width data items) */
 
 	datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
 				       obj_desc->common_field.access_bit_width);
···
 			return_ACPI_STATUS(status);
 		}
 
-		/* Start new output datum by merging with previous input datum */
-
 		field_offset += obj_desc->common_field.access_byte_width;
-		merged_datum = raw_datum >>
-		    (obj_desc->common_field.access_bit_width -
-		     obj_desc->common_field.start_field_bit_offset);
+
+		/*
+		 * Start new output datum by merging with previous input datum
+		 * if necessary.
+		 *
+		 * Note: Before the shift, check if the shift value will be larger than
+		 * the integer size. If so, there is no need to perform the operation.
+		 * This avoids the differences in behavior between different compilers
+		 * concerning shift values larger than the target data width.
+		 */
+		if ((obj_desc->common_field.access_bit_width -
+		     obj_desc->common_field.start_field_bit_offset) <
+		    ACPI_INTEGER_BIT_SIZE) {
+			merged_datum =
+			    raw_datum >> (obj_desc->common_field.
+					  access_bit_width -
+					  obj_desc->common_field.
+					  start_field_bit_offset);
+		} else {
+			merged_datum = 0;
+		}
+
 		mask = width_mask;
 
 		if (i == datum_count) {

drivers/acpi/executer/exmutex.c

···
 
 	/*
 	 * Current Sync must be less than or equal to the sync level of the
-	 * mutex.  This mechanism provides some deadlock prevention
+	 * mutex. This mechanism provides some deadlock prevention
 	 */
 	if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
 		ACPI_ERROR((AE_INFO,
-			    "Cannot acquire Mutex [%4.4s], incorrect SyncLevel",
-			    acpi_ut_get_node_name(obj_desc->mutex.node)));
+			    "Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%d)",
+			    acpi_ut_get_node_name(obj_desc->mutex.node),
+			    walk_state->thread->current_sync_level));
 		return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
 	}
 
···
 
 		if ((obj_desc->mutex.owner_thread->thread_id ==
 		     walk_state->thread->thread_id) ||
-		    (obj_desc->mutex.semaphore ==
-		     acpi_gbl_global_lock_semaphore)) {
+		    (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK)) {
 			/*
 			 * The mutex is already owned by this thread,
 			 * just increment the acquisition depth
···
 	 */
 	if ((obj_desc->mutex.owner_thread->thread_id !=
 	     walk_state->thread->thread_id)
-	    && (obj_desc->mutex.semaphore != acpi_gbl_global_lock_semaphore)) {
+	    && (obj_desc->mutex.os_mutex != ACPI_GLOBAL_LOCK)) {
 		ACPI_ERROR((AE_INFO,
 			    "Thread %X cannot release Mutex [%4.4s] acquired by thread %X",
 			    walk_state->thread->thread_id,

drivers/acpi/executer/exsystem.c

···
  *              interpreter is released.
  *
  ******************************************************************************/
-acpi_status acpi_ex_system_wait_semaphore(acpi_handle semaphore, u16 timeout)
+acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 {
 	acpi_status status;
 	acpi_status status2;
 
 	ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
 
-	status = acpi_os_wait_semaphore(semaphore, 1, 0);
+	status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
 	if (ACPI_SUCCESS(status)) {
 		return_ACPI_STATUS(status);
 	}
···
 		acpi_ex_exit_interpreter();
 
 		status = acpi_os_wait_semaphore(semaphore, 1, timeout);
+
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "*** Thread awake after blocking, %s\n",
+				  acpi_format_exception(status)));
+
+		/* Reacquire the interpreter */
+
+		status2 = acpi_ex_enter_interpreter();
+		if (ACPI_FAILURE(status2)) {
+
+			/* Report fatal error, could not acquire interpreter */
+
+			return_ACPI_STATUS(status2);
+		}
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_wait_mutex
+ *
+ * PARAMETERS:  Mutex           - Mutex to wait on
+ *              Timeout         - Max time to wait
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Implements a semaphore wait with a check to see if the
+ *              semaphore is available immediately.  If it is not, the
+ *              interpreter is released.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
+{
+	acpi_status status;
+	acpi_status status2;
+
+	ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
+
+	status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
+	if (ACPI_SUCCESS(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (status == AE_TIME) {
+
+		/* We must wait, so unlock the interpreter */
+
+		acpi_ex_exit_interpreter();
+
+		status = acpi_os_acquire_mutex(mutex, timeout);
 
 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 				  "*** Thread awake after blocking, %s\n",
···
  *
  * FUNCTION:    acpi_ex_system_acquire_mutex
  *
- * PARAMETERS:  time_desc       - The 'time to delay' object descriptor
+ * PARAMETERS:  time_desc       - Maximum time to wait for the mutex
  *              obj_desc        - The object descriptor for this op
  *
  * RETURN:      Status
···
 
 	/* Support for the _GL_ Mutex object -- go get the global lock */
 
-	if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
+	if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) {
 		status =
 		    acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
 		return_ACPI_STATUS(status);
 	}
 
-	status = acpi_ex_system_wait_semaphore(obj_desc->mutex.semaphore,
-					       (u16) time_desc->integer.value);
+	status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
+					   (u16) time_desc->integer.value);
 	return_ACPI_STATUS(status);
 }
 
···
 
 	/* Support for the _GL_ Mutex object -- release the global lock */
 
-	if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
+	if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) {
 		status = acpi_ev_release_global_lock();
 		return_ACPI_STATUS(status);
 	}
 
-	status = acpi_os_signal_semaphore(obj_desc->mutex.semaphore, 1);
-	return_ACPI_STATUS(status);
+	acpi_os_release_mutex(obj_desc->mutex.os_mutex);
+	return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************
···
 	ACPI_FUNCTION_TRACE(ex_system_signal_event);
 
 	if (obj_desc) {
-		status = acpi_os_signal_semaphore(obj_desc->event.semaphore, 1);
+		status =
+		    acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
 	}
 
 	return_ACPI_STATUS(status);
···
 
 	if (obj_desc) {
 		status =
-		    acpi_ex_system_wait_semaphore(obj_desc->event.semaphore,
+		    acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
 						  (u16) time_desc->integer.
 						  value);
 	}
···
 acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
 {
 	acpi_status status = AE_OK;
-	void *temp_semaphore;
+	acpi_semaphore temp_semaphore;
 
 	ACPI_FUNCTION_ENTRY();
 
···
 	status =
 	    acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
 	if (ACPI_SUCCESS(status)) {
-		(void)acpi_os_delete_semaphore(obj_desc->event.semaphore);
-		obj_desc->event.semaphore = temp_semaphore;
+		(void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
+		obj_desc->event.os_semaphore = temp_semaphore;
 	}
 
 	return (status);

drivers/acpi/hardware/hwregs.c

···
 	}
 
 	/*
-	 * The package must have at least two elements.  NOTE (March 2005): This
+	 * The package must have at least two elements. NOTE (March 2005): This
 	 * goes against the current ACPI spec which defines this object as a
-	 * package with one encoded DWORD element.  However, existing practice
+	 * package with one encoded DWORD element. However, existing practice
 	 * by BIOS vendors seems to be to have 2 or more elements, at least
 	 * one per sleep type (A/B).
 	 */
···
  *              return_value    - Value that was read from the register
  *              Flags           - Lock the hardware or not
  *
- * RETURN:      Status and the value read from specified Register.  Value
+ * RETURN:      Status and the value read from specified Register. Value
  *              returned is normalized to bit0 (is shifted all the way right)
  *
  * DESCRIPTION: ACPI bit_register read function.
···
 	case ACPI_REGISTER_PM1_STATUS:
 
 		/*
-		 * Status Registers are different from the rest.  Clear by
-		 * writing 1, and writing 0 has no effect.  So, the only relevant
+		 * Status Registers are different from the rest. Clear by
+		 * writing 1, and writing 0 has no effect. So, the only relevant
 		 * information is the single bit we're interested in, all others should
 		 * be written as 0 so they will be left unchanged.
 		 */
···
  *
  * FUNCTION:    acpi_hw_register_read
  *
- * PARAMETERS:  use_lock            - Mutex hw access
- *              register_id         - register_iD + Offset
+ * PARAMETERS:  use_lock            - Lock hardware? True/False
+ *              register_id         - ACPI Register ID
  *              return_value        - Where the register value is returned
  *
  * RETURN:      Status and the value read.
  *
- * DESCRIPTION: Acpi register read function.  Registers are read at the
- *              given offset.
+ * DESCRIPTION: Read from the specified ACPI register
  *
  ******************************************************************************/
 acpi_status
···
  *
  * FUNCTION:    acpi_hw_register_write
  *
- * PARAMETERS:  use_lock            - Mutex hw access
- *              register_id         - register_iD + Offset
+ * PARAMETERS:  use_lock            - Lock hardware? True/False
+ *              register_id         - ACPI Register ID
  *              Value               - The value to write
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Acpi register Write function.  Registers are written at the
- *              given offset.
+ * DESCRIPTION: Write to the specified ACPI register
+ *
+ * NOTE: In accordance with the ACPI specification, this function automatically
+ * preserves the value of the following bits, meaning that these bits cannot be
+ * changed via this interface:
+ *
+ * PM1_CONTROL[0] = SCI_EN
+ * PM1_CONTROL[9]
+ * PM1_STATUS[11]
+ *
+ * ACPI References:
+ * 1) Hardware Ignored Bits: When software writes to a register with ignored
+ *      bit fields, it preserves the ignored bit fields
+ * 2) SCI_EN: OSPM always preserves this bit position
  *
  ******************************************************************************/
 
···
 {
 	acpi_status status;
 	acpi_cpu_flags lock_flags = 0;
+	u32 read_value;
 
 	ACPI_FUNCTION_TRACE(hw_register_write);
 
···
 
 	switch (register_id) {
 	case ACPI_REGISTER_PM1_STATUS:	/* 16-bit access */
+
+		/* Perform a read first to preserve certain bits (per ACPI spec) */
+
+		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
+					       ACPI_REGISTER_PM1_STATUS,
+					       &read_value);
+		if (ACPI_FAILURE(status)) {
+			goto unlock_and_exit;
+		}
+
+		/* Insert the bits to be preserved */
+
+		ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS,
+				 read_value);
+
+		/* Now we can write the data */
 
 		status =
 		    acpi_hw_low_level_write(16, value,
···
 		break;
 
 	case ACPI_REGISTER_PM1_CONTROL:	/* 16-bit access */
+
+		/*
+		 * Perform a read first to preserve certain bits (per ACPI spec)
+		 *
+		 * Note: This includes SCI_EN, we never want to change this bit
+		 */
+		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
+					       ACPI_REGISTER_PM1_CONTROL,
+					       &read_value);
+		if (ACPI_FAILURE(status)) {
+			goto unlock_and_exit;
+		}
+
+		/* Insert the bits to be preserved */
+
+		ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
+				 read_value);
+
+		/* Now we can write the data */
 
 		status =
 		    acpi_hw_low_level_write(16, value,
···
 		return (AE_OK);
 	}
 
-	/* Get a local copy of the address.  Handles possible alignment issues */
+	/* Get a local copy of the address. Handles possible alignment issues */
 
 	ACPI_MOVE_64_TO_64(&address, &reg->address);
 	if (!address) {
···
 		return (AE_OK);
 	}
 
-	/* Get a local copy of the address.  Handles possible alignment issues */
+	/* Get a local copy of the address. Handles possible alignment issues */
 
 	ACPI_MOVE_64_TO_64(&address, &reg->address);
 	if (!address) {

drivers/acpi/namespace/nsaccess.c

···
 				    (u8) (ACPI_TO_INTEGER(val) - 1);
 
 				if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
-					/*
-					 * Create a counting semaphore for the
-					 * global lock
-					 */
+
+					/* Create a counting semaphore for the global lock */
+
 					status =
 					    acpi_os_create_semaphore
 					    (ACPI_NO_UNIT_LIMIT, 1,
-					     &obj_desc->mutex.semaphore);
+					     &acpi_gbl_global_lock_semaphore);
 					if (ACPI_FAILURE(status)) {
 						acpi_ut_remove_reference
 						    (obj_desc);
 						goto unlock_and_exit;
 					}
 
-					/*
-					 * We just created the mutex for the
-					 * global lock, save it
-					 */
-					acpi_gbl_global_lock_semaphore =
-					    obj_desc->mutex.semaphore;
+					/* Mark this mutex as very special */
+
+					obj_desc->mutex.os_mutex =
+					    ACPI_GLOBAL_LOCK;
 				} else {
 					/* Create a mutex */
 
-					status = acpi_os_create_semaphore(1, 1,
-									  &obj_desc->
-									  mutex.
-									  semaphore);
+					status =
+					    acpi_os_create_mutex(&obj_desc->
+								 mutex.
+								 os_mutex);
 					if (ACPI_FAILURE(status)) {
 						acpi_ut_remove_reference
 						    (obj_desc);

drivers/acpi/osl.c

···
 /*
  * Allocate the memory for a spinlock and initialize it.
  */
-acpi_status acpi_os_create_lock(acpi_handle * out_handle)
+acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 {
-	spinlock_t *lock_ptr;
-
-
-	lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
-
-	spin_lock_init(lock_ptr);
-
-	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
-
-	*out_handle = lock_ptr;
+	spin_lock_init(*handle);
 
 	return AE_OK;
 }
···
 /*
  * Deallocate the memory for a spinlock.
  */
-void acpi_os_delete_lock(acpi_handle handle)
+void acpi_os_delete_lock(acpi_spinlock handle)
 {
-
-	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
-
-	acpi_os_free(handle);
-
 	return;
 }
 
···
  * handle is a pointer to the spinlock_t.
  */
 
-acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle)
+acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
 {
 	acpi_cpu_flags flags;
-	spin_lock_irqsave((spinlock_t *) handle, flags);
+	spin_lock_irqsave(lockp, flags);
 	return flags;
 }
 
···
  * Release a spinlock. See above.
  */
 
-void acpi_os_release_lock(acpi_handle handle, acpi_cpu_flags flags)
+void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
 {
-	spin_unlock_irqrestore((spinlock_t *) handle, flags);
+	spin_unlock_irqrestore(lockp, flags);
 }
 
 #ifndef ACPI_USE_LOCAL_CACHE

drivers/acpi/parser/psparse.c

···
 	}
 
 	walk_state->thread = thread;
+
+	/*
+	 * If executing a method, the starting sync_level is this method's
+	 * sync_level
+	 */
+	if (walk_state->method_desc) {
+		walk_state->thread->current_sync_level =
+		    walk_state->method_desc->method.sync_level;
+	}
+
 	acpi_ds_push_walk_state(walk_state, thread);
 
 	/*
···
 			status =
 			    acpi_ds_call_control_method(thread, walk_state,
 							NULL);
+			if (ACPI_FAILURE(status)) {
+				status =
+				    acpi_ds_method_error(status, walk_state);
+			}
 
 			/*
 			 * If the transfer to the new method method call worked, a new walk
···
 			/* Check for possible multi-thread reentrancy problem */
 
 			if ((status == AE_ALREADY_EXISTS) &&
-			    (!walk_state->method_desc->method.semaphore)) {
+			    (!walk_state->method_desc->method.mutex)) {
 				/*
 				 * Method tried to create an object twice. The probable cause is
 				 * that the method cannot handle reentrancy.
···
 				 */
 				walk_state->method_desc->method.method_flags |=
 				    AML_METHOD_SERIALIZED;
-				walk_state->method_desc->method.concurrency = 1;
+				walk_state->method_desc->method.sync_level = 0;
 			}
 		}
 

drivers/acpi/utilities/utdelete.c

···
 	case ACPI_TYPE_MUTEX:
 
 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
-				  "***** Mutex %p, Semaphore %p\n",
-				  object, object->mutex.semaphore));
+				  "***** Mutex %p, OS Mutex %p\n",
+				  object, object->mutex.os_mutex));
 
-		acpi_ex_unlink_mutex(object);
-		(void)acpi_os_delete_semaphore(object->mutex.semaphore);
+		if (object->mutex.os_mutex != ACPI_GLOBAL_LOCK) {
+			acpi_ex_unlink_mutex(object);
+			acpi_os_delete_mutex(object->mutex.os_mutex);
+		} else {
+			/* Global Lock "mutex" is actually a counting semaphore */
+
+			(void)
+			    acpi_os_delete_semaphore
+			    (acpi_gbl_global_lock_semaphore);
+			acpi_gbl_global_lock_semaphore = NULL;
+		}
 		break;
 
 	case ACPI_TYPE_EVENT:
 
 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
-				  "***** Event %p, Semaphore %p\n",
-				  object, object->event.semaphore));
+				  "***** Event %p, OS Semaphore %p\n",
+				  object, object->event.os_semaphore));
 
-		(void)acpi_os_delete_semaphore(object->event.semaphore);
-		object->event.semaphore = NULL;
+		(void)acpi_os_delete_semaphore(object->event.os_semaphore);
+		object->event.os_semaphore = NULL;
 		break;
 
 	case ACPI_TYPE_METHOD:
···
 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Method %p\n", object));
 
-		/* Delete the method semaphore if it exists */
+		/* Delete the method mutex if it exists */
 
-		if (object->method.semaphore) {
-			(void)acpi_os_delete_semaphore(object->method.
-						       semaphore);
-			object->method.semaphore = NULL;
+		if (object->method.mutex) {
+			acpi_os_delete_mutex(object->method.mutex->mutex.
+					     os_mutex);
+			acpi_ut_delete_object_desc(object->method.mutex);
+			object->method.mutex = NULL;
 		}
 		break;
 

drivers/acpi/utilities/utglobal.c

···
 
 	/* Global Lock support */
 
+	acpi_gbl_global_lock_semaphore = NULL;
 	acpi_gbl_global_lock_acquired = FALSE;
 	acpi_gbl_global_lock_thread_count = 0;
 	acpi_gbl_global_lock_handle = 0;

drivers/acpi/utilities/utmutex.c

···
 
 	/* Create the spinlocks for use at interrupt level */
 
-	status = acpi_os_create_lock(&acpi_gbl_gpe_lock);
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
+	spin_lock_init(acpi_gbl_gpe_lock);
+	spin_lock_init(acpi_gbl_hardware_lock);
 
-	status = acpi_os_create_lock(&acpi_gbl_hardware_lock);
 	return_ACPI_STATUS(status);
 }
 
···
 	}
 
 	if (!acpi_gbl_mutex_info[mutex_id].mutex) {
-		status = acpi_os_create_semaphore(1, 1,
-						  &acpi_gbl_mutex_info
-						  [mutex_id].mutex);
+		status =
+		    acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
 		acpi_gbl_mutex_info[mutex_id].thread_id =
 		    ACPI_MUTEX_NOT_ACQUIRED;
 		acpi_gbl_mutex_info[mutex_id].use_count = 0;
···
 
 static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
 {
-	acpi_status status;
 
 	ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
 
···
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
 
-	status = acpi_os_delete_semaphore(acpi_gbl_mutex_info[mutex_id].mutex);
+	acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
 
 	acpi_gbl_mutex_info[mutex_id].mutex = NULL;
 	acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
 
-	return_ACPI_STATUS(status);
+	return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************
···
 			  "Thread %X attempting to acquire Mutex [%s]\n",
 			  this_thread_id, acpi_ut_get_mutex_name(mutex_id)));
 
-	status = acpi_os_wait_semaphore(acpi_gbl_mutex_info[mutex_id].mutex,
-					1, ACPI_WAIT_FOREVER);
+	status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
+				       ACPI_WAIT_FOREVER);
 	if (ACPI_SUCCESS(status)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 				  "Thread %X acquired Mutex [%s]\n",
···
 
 acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
 {
-	acpi_status status;
 	acpi_thread_id this_thread_id;
 
 	ACPI_FUNCTION_NAME(ut_release_mutex);
···
 
 	acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
 
-	status =
-	    acpi_os_signal_semaphore(acpi_gbl_mutex_info[mutex_id].mutex, 1);
-
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status,
-				"Thread %X could not release Mutex [%X]",
-				this_thread_id, mutex_id));
-	} else {
-		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
-				  "Thread %X released Mutex [%s]\n",
-				  this_thread_id,
-				  acpi_ut_get_mutex_name(mutex_id)));
-	}
-
-	return (status);
+	acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
+	return (AE_OK);
 }

include/acpi/acconfig.h

···
 
 /* Current ACPICA subsystem version in YYYYMMDD format */
 
-#define ACPI_CA_VERSION                 0x20060608
+#define ACPI_CA_VERSION                 0x20060623
 
 /*
  * OS name, used for the _OS object.  The _OS object is essentially obsolete,

include/acpi/acdispat.h

···
 acpi_status
 acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
 			       union acpi_operand_object *obj_desc,
-			       struct acpi_namespace_node *calling_method_node);
+			       struct acpi_walk_state *walk_state);
 
 acpi_status
 acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state);

include/acpi/acglobal.h

···
 extern struct acpi_table_list acpi_gbl_table_lists[ACPI_TABLE_ID_MAX + 1];
 extern struct acpi_table_support acpi_gbl_table_data[ACPI_TABLE_ID_MAX + 1];
 
+/*****************************************************************************
+ *
+ * Mutual exlusion within ACPICA subsystem
+ *
+ ****************************************************************************/
+
 /*
  * Predefined mutex objects.  This array contains the
  * actual OS mutex handles, indexed by the local ACPI_MUTEX_HANDLEs.
  * (The table maps local handles to the real OS handles)
  */
 ACPI_EXTERN struct acpi_mutex_info acpi_gbl_mutex_info[ACPI_NUM_MUTEX];
+
+/*
+ * Global lock semaphore works in conjunction with the actual HW global lock
+ */
+ACPI_EXTERN acpi_semaphore acpi_gbl_global_lock_semaphore;
+
+/*
+ * Spinlocks are used for interfaces that can be possibly called at
+ * interrupt level
+ */
+ACPI_EXTERN spinlock_t _acpi_gbl_gpe_lock;	/* For GPE data structs and registers */
+ACPI_EXTERN spinlock_t _acpi_gbl_hardware_lock;	/* For ACPI H/W except GPE registers */
+#define acpi_gbl_gpe_lock	&_acpi_gbl_gpe_lock
+#define acpi_gbl_hardware_lock	&_acpi_gbl_hardware_lock
 
 /*****************************************************************************
  *
···
 ACPI_EXTERN acpi_exception_handler acpi_gbl_exception_handler;
 ACPI_EXTERN acpi_init_handler acpi_gbl_init_handler;
 ACPI_EXTERN struct acpi_walk_state *acpi_gbl_breakpoint_walk;
-ACPI_EXTERN acpi_handle acpi_gbl_global_lock_semaphore;
 
 /* Misc */
 
···
 ACPI_EXTERN struct acpi_gpe_xrupt_info *acpi_gbl_gpe_xrupt_list_head;
 ACPI_EXTERN struct acpi_gpe_block_info
     *acpi_gbl_gpe_fadt_blocks[ACPI_MAX_GPE_BLOCKS];
-
-/* Spinlocks */
-
-ACPI_EXTERN acpi_handle acpi_gbl_gpe_lock;
-ACPI_EXTERN acpi_handle acpi_gbl_hardware_lock;
 
 /*****************************************************************************
  *

include/acpi/acinterp.h

···
 
 acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc);
 
-acpi_status acpi_ex_system_wait_semaphore(acpi_handle semaphore, u16 timeout);
+acpi_status
+acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout);
+
+acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout);
 
 /*
  * exoparg1 - ACPI AML execution, 1 operand

include/acpi/aclocal.h

···
 /* acpisrc:struct_defs -- for acpisrc conversion */
 
 #define ACPI_WAIT_FOREVER               0xFFFF	/* u16, as per ACPI spec */
-#define ACPI_INFINITE_CONCURRENCY       0xFF
+#define ACPI_DO_NOT_WAIT                0
+#define ACPI_SERIALIZED                 0xFF
 
-typedef void *acpi_mutex;
 typedef u32 acpi_mutex_handle;
+#define ACPI_GLOBAL_LOCK                (acpi_semaphore) (-1)
 
 /* Total number of aml opcodes defined */
 
···
  * table below also!
  */
 #define ACPI_MTX_INTERPRETER            0	/* AML Interpreter, main lock */
-#define ACPI_MTX_CONTROL_METHOD         1	/* Control method termination [TBD: may no longer be necessary] */
-#define ACPI_MTX_TABLES                 2	/* Data for ACPI tables */
-#define ACPI_MTX_NAMESPACE              3	/* ACPI Namespace */
-#define ACPI_MTX_EVENTS                 4	/* Data for ACPI events */
-#define ACPI_MTX_CACHES                 5	/* Internal caches, general purposes */
-#define ACPI_MTX_MEMORY                 6	/* Debug memory tracking lists */
-#define ACPI_MTX_DEBUG_CMD_COMPLETE     7	/* AML debugger */
-#define ACPI_MTX_DEBUG_CMD_READY        8	/* AML debugger */
+#define ACPI_MTX_TABLES                 1	/* Data for ACPI tables */
+#define ACPI_MTX_NAMESPACE              2	/* ACPI Namespace */
+#define ACPI_MTX_EVENTS                 3	/* Data for ACPI events */
+#define ACPI_MTX_CACHES                 4	/* Internal caches, general purposes */
+#define ACPI_MTX_MEMORY                 5	/* Debug memory tracking lists */
+#define ACPI_MTX_DEBUG_CMD_COMPLETE     6	/* AML debugger */
+#define ACPI_MTX_DEBUG_CMD_READY        7	/* AML debugger */
 
-#define ACPI_MAX_MUTEX                  8
+#define ACPI_MAX_MUTEX                  7
 #define ACPI_NUM_MUTEX                  ACPI_MAX_MUTEX+1
 
 #if defined(ACPI_DEBUG_OUTPUT) || defined(ACPI_DEBUGGER)
···
 
 static char *acpi_gbl_mutex_names[ACPI_NUM_MUTEX] = {
 	"ACPI_MTX_Interpreter",
-	"ACPI_MTX_Method",
 	"ACPI_MTX_Tables",
 	"ACPI_MTX_Namespace",
 	"ACPI_MTX_Events",
 	"ACPI_MTX_Caches",
 	"ACPI_MTX_Memory",
-	"ACPI_MTX_DebugCmdComplete",
-	"ACPI_MTX_DebugCmdReady"
+	"ACPI_MTX_CommandComplete",
+	"ACPI_MTX_CommandReady"
 };
 
 #endif
···
 	u8 bit_position;
 	u16 access_bit_mask;
 };
+
+/*
+ * Some ACPI registers have bits that must be ignored -- meaning that they
+ * must be preserved.
+ */
+#define ACPI_PM1_STATUS_PRESERVED_BITS          0x0800	/* Bit 11 */
+#define ACPI_PM1_CONTROL_PRESERVED_BITS         0x0201	/* Bit 9, Bit 0 (SCI_EN) */
 
 /*
  * Register IDs

include/acpi/acmacros.h

···
 #define ACPI_REGISTER_PREPARE_BITS(val, pos, mask)      ((val << pos) & mask)
 #define ACPI_REGISTER_INSERT_VALUE(reg, pos, mask, val)  reg = (reg & (~(mask))) | ACPI_REGISTER_PREPARE_BITS(val, pos, mask)
 
+#define ACPI_INSERT_BITS(target, mask, source)          target = ((target & (~(mask))) | (source & mask))
+
 /* Generate a UUID */
 
 #define ACPI_INIT_UUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \

include/acpi/acobject.h

···
  *****************************************************************************/
 
 struct acpi_object_event {
-	ACPI_OBJECT_COMMON_HEADER void *semaphore;
+	ACPI_OBJECT_COMMON_HEADER acpi_semaphore os_semaphore;	/* Actual OS synchronization object */
 };
 
 struct acpi_object_mutex {
 	ACPI_OBJECT_COMMON_HEADER u8 sync_level;	/* 0-15, specified in Mutex() call */
 	u16 acquisition_depth;	/* Allow multiple Acquires, same thread */
 	struct acpi_thread_state *owner_thread;	/* Current owner of the mutex */
-	void *semaphore;	/* Actual OS synchronization object */
+	acpi_mutex os_mutex;	/* Actual OS synchronization object */
 	union acpi_operand_object *prev;	/* Link for list of acquired mutexes */
 	union acpi_operand_object *next;	/* Link for list of acquired mutexes */
 	struct acpi_namespace_node *node;	/* Containing namespace node */
···
 struct acpi_object_method {
 	ACPI_OBJECT_COMMON_HEADER u8 method_flags;
 	u8 param_count;
-	u8 concurrency;
-	void *semaphore;
+	u8 sync_level;
+	union acpi_operand_object *mutex;
 	u8 *aml_start;
 	ACPI_INTERNAL_METHOD implementation;
 	u32 aml_length;

include/acpi/acpiosxf.h

···
 		       struct acpi_table_header **new_table);
 
 /*
- * Synchronization primitives
+ * Spinlock primitives
+ */
+acpi_status acpi_os_create_lock(acpi_spinlock * out_handle);
+
+void acpi_os_delete_lock(acpi_spinlock handle);
+
+acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock handle);
+
+void acpi_os_release_lock(acpi_spinlock handle, acpi_cpu_flags flags);
+
+/*
+ * Semaphore primitives
  */
 acpi_status
 acpi_os_create_semaphore(u32 max_units,
-			 u32 initial_units, acpi_handle * out_handle);
+			 u32 initial_units, acpi_semaphore * out_handle);
 
-acpi_status acpi_os_delete_semaphore(acpi_handle handle);
+acpi_status acpi_os_delete_semaphore(acpi_semaphore handle);
 
-acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout);
+acpi_status
+acpi_os_wait_semaphore(acpi_semaphore handle, u32 units, u16 timeout);
 
-acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units);
+acpi_status acpi_os_signal_semaphore(acpi_semaphore handle, u32 units);
 
-acpi_status acpi_os_create_lock(acpi_handle * out_handle);
+/*
+ * Mutex primitives
+ */
+acpi_status acpi_os_create_mutex(acpi_mutex * out_handle);
 
-void acpi_os_delete_lock(acpi_handle handle);
+void acpi_os_delete_mutex(acpi_mutex handle);
 
-acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle);
+acpi_status acpi_os_acquire_mutex(acpi_mutex handle, u16 timeout);
 
-void acpi_os_release_lock(acpi_handle handle, acpi_cpu_flags flags);
+void acpi_os_release_mutex(acpi_mutex handle);
+
+/* Temporary macros for Mutex* interfaces, map to existing semaphore xfaces */
+
+#define acpi_os_create_mutex(out_handle)    acpi_os_create_semaphore (1, 1, out_handle)
+#define acpi_os_delete_mutex(handle)        (void) acpi_os_delete_semaphore (handle)
+#define acpi_os_acquire_mutex(handle,time)  acpi_os_wait_semaphore (handle, 1, time)
+#define acpi_os_release_mutex(handle)       (void) acpi_os_signal_semaphore (handle, 1)
 
 /*
  * Memory allocation and mapping

include/acpi/actypes.h

···
 
 /*******************************************************************************
  *
- * OS- or compiler-dependent types
+ * OS-dependent and compiler-dependent types
  *
  * If the defaults below are not appropriate for the host system, they can
  * be defined in the compiler-specific or OS-specific header, and this will
···
  *
  ******************************************************************************/
 
-/* Use C99 uintptr_t for pointer casting if available, "void *" otherwise */
+/* Value returned by acpi_os_get_thread_id */
 
-#ifndef acpi_uintptr_t
-#define acpi_uintptr_t                  void *
+#ifndef acpi_thread_id
+#define acpi_thread_id                  acpi_native_uint
 #endif
 
-/*
- * If acpi_cache_t was not defined in the OS-dependent header,
- * define it now. This is typically the case where the local cache
- * manager implementation is to be used (ACPI_USE_LOCAL_CACHE)
- */
+/* Object returned from acpi_os_create_lock */
+
+#ifndef acpi_spinlock
+#define acpi_spinlock                   void *
+#endif
+
+/* Flags for acpi_os_acquire_lock/acpi_os_release_lock */
+
+#ifndef acpi_cpu_flags
+#define acpi_cpu_flags                  acpi_native_uint
+#endif
+
+/* Object returned from acpi_os_create_cache */
+
 #ifndef acpi_cache_t
 #define acpi_cache_t                    struct acpi_memory_list
 #endif
 
-/*
- * Allow the CPU flags word to be defined per-OS to simplify the use of the
- * lock and unlock OSL interfaces.
- */
-#ifndef acpi_cpu_flags
-#define acpi_cpu_flags                  acpi_native_uint
+/* Use C99 uintptr_t for pointer casting if available, "void *" otherwise */
+
+#ifndef acpi_uintptr_t
+#define acpi_uintptr_t                  void *
 #endif
 
 /*
···
  */
 #ifndef ACPI_EXPORT_SYMBOL
 #define ACPI_EXPORT_SYMBOL(symbol)
-#endif
-
-/*
- * thread_id is returned by acpi_os_get_thread_id.
- */
-#ifndef acpi_thread_id
-#define acpi_thread_id                  acpi_native_uint
 #endif
 
 /*******************************************************************************
···
 	u32 lo;
 	u32 hi;
 };
+
+/* Synchronization objects */
+
+#define acpi_mutex                      void *
+#define acpi_semaphore                  void *
 
 /*
  * Acpi integer width. In ACPI version 1, integers are

include/acpi/platform/aclinux.h

···
 #include <asm/div64.h>
 #include <asm/acpi.h>
 #include <linux/slab.h>
+#include <linux/spinlock_types.h>
 
 /* Host-dependent types and defines */
 
 #define ACPI_MACHINE_WIDTH          BITS_PER_LONG
 #define acpi_cache_t                        kmem_cache_t
+#define acpi_spinlock                   spinlock_t *
 #define ACPI_EXPORT_SYMBOL(symbol)  EXPORT_SYMBOL(symbol);
 #define strtoul                     simple_strtoul