diff --git a/include/acpi/acconfig.h b/include/acpi/acconfig.h
index b9beceb..b492857 100644
--- a/include/acpi/acconfig.h
+++ b/include/acpi/acconfig.h
@@ -63,7 +63,7 @@
 
 /* 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,
diff --git a/include/acpi/acdispat.h b/include/acpi/acdispat.h
index 288f849..a22fe9c 100644
--- a/include/acpi/acdispat.h
+++ b/include/acpi/acdispat.h
@@ -201,7 +201,7 @@
 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);
diff --git a/include/acpi/acglobal.h b/include/acpi/acglobal.h
index 14531d4..06972e6 100644
--- a/include/acpi/acglobal.h
+++ b/include/acpi/acglobal.h
@@ -181,6 +181,12 @@
 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.
@@ -188,6 +194,20 @@
  */
 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
+
 /*****************************************************************************
  *
  * Miscellaneous globals
@@ -217,7 +237,6 @@
 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 */
 
@@ -315,11 +334,6 @@
 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;
-
 /*****************************************************************************
  *
  * Debugger globals
diff --git a/include/acpi/acinterp.h b/include/acpi/acinterp.h
index 9f22cfc..216339a 100644
--- a/include/acpi/acinterp.h
+++ b/include/acpi/acinterp.h
@@ -287,7 +287,10 @@
 
 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
diff --git a/include/acpi/aclocal.h b/include/acpi/aclocal.h
index 1eeca7a..56b8024 100644
--- a/include/acpi/aclocal.h
+++ b/include/acpi/aclocal.h
@@ -47,10 +47,11 @@
 /* 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 */
 
@@ -79,16 +80,15 @@
  * 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)
@@ -98,14 +98,13 @@
 
 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
@@ -705,6 +704,13 @@
 };
 
 /*
+ * 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
  * These are the full ACPI registers
  */
diff --git a/include/acpi/acmacros.h b/include/acpi/acmacros.h
index 38f9aa4..4bb3806 100644
--- a/include/acpi/acmacros.h
+++ b/include/acpi/acmacros.h
@@ -394,6 +394,8 @@
 #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) \
diff --git a/include/acpi/acobject.h b/include/acpi/acobject.h
index 1747d940..8fdee31 100644
--- a/include/acpi/acobject.h
+++ b/include/acpi/acobject.h
@@ -140,14 +140,14 @@
  *****************************************************************************/
 
 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 */
@@ -166,8 +166,8 @@
 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;
diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index 8f473c8..89bc4a1 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -96,25 +96,47 @@
 		       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
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 77cf123..64b603cf 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -241,7 +241,7 @@
 
 /*******************************************************************************
  *
- * 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
@@ -249,27 +249,34 @@
  *
  ******************************************************************************/
 
-/* 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
 
 /*
@@ -298,13 +305,6 @@
 #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
-
 /*******************************************************************************
  *
  * Independent types
@@ -380,6 +380,11 @@
 	u32 hi;
 };
 
+/* Synchronization objects */
+
+#define acpi_mutex                      void *
+#define acpi_semaphore                  void *
+
 /*
  * Acpi integer width. In ACPI version 1, integers are
  * 32 bits.  In ACPI version 2, integers are 64 bits.
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 277d35b..3f853ca 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -58,11 +58,13 @@
 #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