1 files changed, 30 insertions, 7 deletions

diff --git a/include/acpi/acobject.h b/include/acpi/acobject.h
index e9657dac69b7..eb6f038b03d9 100644
--- a/include/acpi/acobject.h
+++ b/include/acpi/acobject.h
@@ -308,18 +308,34 @@ struct acpi_object_addr_handler {
  *****************************************************************************/
 
 /*
- * The Reference object type is used for these opcodes:
- * Arg[0-6], Local[0-7], index_op, name_op, zero_op, one_op, ones_op, debug_op
+ * The Reference object is used for these opcodes:
+ * Arg[0-6], Local[0-7], index_op, name_op, ref_of_op, load_op, load_table_op, debug_op
+ * The Reference.Class differentiates these types.
  */
 struct acpi_object_reference {
-        ACPI_OBJECT_COMMON_HEADER u8 target_type;       /* Used for index_op */
-        u16 opcode;
+        ACPI_OBJECT_COMMON_HEADER u8 class;     /* Reference Class */
+        u8 target_type;         /* Used for Index Op */
+        u8 reserved;
         void *object;           /* name_op=>HANDLE to obj, index_op=>union acpi_operand_object */
-        struct acpi_namespace_node *node;
-        union acpi_operand_object **where;
-        u32 offset;             /* Used for arg_op, local_op, and index_op */
+        struct acpi_namespace_node *node;       /* ref_of or Namepath */
+        union acpi_operand_object **where;      /* Target of Index */
+        u32 value;              /* Used for Local/Arg/Index/ddb_handle */
 };
 
+/* Values for Reference.Class above */
+
+typedef enum {
+        ACPI_REFCLASS_LOCAL = 0,        /* Method local */
+        ACPI_REFCLASS_ARG = 1,  /* Method argument */
+        ACPI_REFCLASS_REFOF = 2,        /* Result of ref_of() TBD: Split to Ref/Node and Ref/operand_obj? */
+        ACPI_REFCLASS_INDEX = 3,        /* Result of Index() */
+        ACPI_REFCLASS_TABLE = 4,        /* ddb_handle - Load(), load_table() */
+        ACPI_REFCLASS_NAME = 5, /* Reference to a named object */
+        ACPI_REFCLASS_DEBUG = 6,        /* Debug object */
+
+        ACPI_REFCLASS_MAX = 6
+} ACPI_REFERENCE_CLASSES;
+
 /*
  * Extra object is used as additional storage for types that
  * have AML code in their declarations (term_args) that must be
@@ -379,6 +395,13 @@ union acpi_operand_object {
         struct acpi_object_extra extra;
         struct acpi_object_data data;
         struct acpi_object_cache_list cache;
+
+        /*
+         * Add namespace node to union in order to simplify code that accepts both
+         * ACPI_OPERAND_OBJECTs and ACPI_NAMESPACE_NODEs. The structures share
+         * a common descriptor_type field in order to differentiate them.
+         */
+        struct acpi_namespace_node node;
 };
 
 /******************************************************************************