ACPICA: New: Validation for predefined ACPI methods/objects

Validates predefined ACPI objects that appear in the namespace,
at the time they are evaluated. The argument count and the type of
the returned object are validated. The purpose of this validation
is to detect problems with the BIOS-exposed predefined ACPI objects
before the results are returned to the ACPI-related drivers.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

4 files changed, 468 insertions, 0 deletions

diff --git a/include/acpi/acdebug.h b/include/acpi/acdebug.h
index a4fb001d96f1..62c59df3b86c 100644
--- a/include/acpi/acdebug.h
+++ b/include/acpi/acdebug.h
@@ -154,6 +154,10 @@ void
 acpi_db_display_argument_object(union acpi_operand_object *obj_desc,
                                 struct acpi_walk_state *walk_state);
 
+void acpi_db_check_predefined_names(void);
+
+void acpi_db_batch_execute(void);
+
 /*
  * dbexec - debugger control method execution
  */
diff --git a/include/acpi/aclocal.h b/include/acpi/aclocal.h
index b221c8583ddd..ecab527cf78e 100644
--- a/include/acpi/aclocal.h
+++ b/include/acpi/aclocal.h
@@ -208,6 +208,7 @@ struct acpi_namespace_node {
 #define ANOBJ_METHOD_ARG                0x04    /* Node is a method argument */
 #define ANOBJ_METHOD_LOCAL              0x08    /* Node is a method local */
 #define ANOBJ_SUBTREE_HAS_INI           0x10    /* Used to optimize device initialization */
+#define ANOBJ_EVALUATED                 0x20    /* Set on first evaluation of node */
 
 #define ANOBJ_IS_EXTERNAL               0x08    /* i_aSL only: This object created via External() */
 #define ANOBJ_METHOD_NO_RETVAL          0x10    /* i_aSL only: Method has no return value */
@@ -340,6 +341,82 @@ acpi_status(*ACPI_INTERNAL_METHOD) (struct acpi_walk_state * walk_state);
 #define ACPI_BTYPE_OBJECTS_AND_REFS     0x0001FFFF      /* ARG or LOCAL */
 #define ACPI_BTYPE_ALL_OBJECTS          0x0000FFFF
 
+/*
+ * Information structure for ACPI predefined names.
+ * Each entry in the table contains the following items:
+ *
+ * Name                 - The ACPI reserved name
+ * param_count          - Number of arguments to the method
+ * expected_return_btypes - Allowed type(s) for the return value
+ */
+struct acpi_name_info {
+        char name[ACPI_NAME_SIZE];
+        u8 param_count;
+        u8 expected_btypes;
+};
+
+/*
+ * Secondary information structures for ACPI predefined objects that return
+ * package objects. This structure appears as the next entry in the table
+ * after the NAME_INFO structure above.
+ *
+ * The reason for this is to minimize the size of the predefined name table.
+ */
+
+/*
+ * Used for ACPI_PTYPE1_FIXED, ACPI_PTYPE1_VAR, ACPI_PTYPE2,
+ * ACPI_PTYPE2_MIN, ACPI_PTYPE2_PKG_COUNT, ACPI_PTYPE2_COUNT
+ */
+struct acpi_package_info {
+        u8 type;
+        u8 object_type1;
+        u8 count1;
+        u8 object_type2;
+        u8 count2;
+        u8 reserved;
+};
+
+/* Used for ACPI_PTYPE2_FIXED */
+
+struct acpi_package_info2 {
+        u8 type;
+        u8 count;
+        u8 object_type[4];
+};
+
+/* Used for ACPI_PTYPE1_OPTION */
+
+struct acpi_package_info3 {
+        u8 type;
+        u8 count;
+        u8 object_type[2];
+        u8 tail_object_type;
+        u8 reserved;
+};
+
+union acpi_predefined_info {
+        struct acpi_name_info info;
+        struct acpi_package_info ret_info;
+        struct acpi_package_info2 ret_info2;
+        struct acpi_package_info3 ret_info3;
+};
+
+/*
+ * Bitmapped return value types
+ * Note: the actual data types must be contiguous, a loop in nspredef.c
+ * depends on this.
+ */
+#define ACPI_RTYPE_ANY                  0x00
+#define ACPI_RTYPE_NONE                 0x01
+#define ACPI_RTYPE_INTEGER              0x02
+#define ACPI_RTYPE_STRING               0x04
+#define ACPI_RTYPE_BUFFER               0x08
+#define ACPI_RTYPE_PACKAGE              0x10
+#define ACPI_RTYPE_REFERENCE            0x20
+#define ACPI_RTYPE_ALL                  0x3F
+
+#define ACPI_NUM_RTYPES                 5       /* Number of actual object types */
+
 /*****************************************************************************
  *
  * Event typedefs and structs
diff --git a/include/acpi/acnamesp.h b/include/acpi/acnamesp.h
index c34008507b69..db4e6f677855 100644
--- a/include/acpi/acnamesp.h
+++ b/include/acpi/acnamesp.h
@@ -178,6 +178,22 @@ acpi_ns_dump_objects(acpi_object_type type,
 acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info);
 
 /*
+ * nspredef - Support for predefined/reserved names
+ */
+acpi_status
+acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
+                               union acpi_operand_object *return_object);
+
+const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct
+                                                                    acpi_namespace_node
+                                                                    *node);
+
+void
+acpi_ns_check_parameter_count(char *pathname,
+                              struct acpi_namespace_node *node,
+                              const union acpi_predefined_info *info);
+
+/*
  * nsnames - Name and Scope manipulation
  */
 u32 acpi_ns_opens_scope(acpi_object_type type);
diff --git a/include/acpi/acpredef.h b/include/acpi/acpredef.h
new file mode 100644
index 000000000000..619fb75f8861
--- /dev/null
+++ b/include/acpi/acpredef.h
@@ -0,0 +1,371 @@
+/******************************************************************************
+ *
+ * Name: acpredef - Information table for ACPI predefined methods and objects
+ *              $Revision: 1.1 $
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#ifndef __ACPREDEF_H__
+#define __ACPREDEF_H__
+
+/******************************************************************************
+ *
+ * Return Package types
+ *
+ * 1) PTYPE1 packages do not contain sub-packages.
+ *
+ * ACPI_PTYPE1_FIXED: Fixed length, 1 or 2 object types:
+ *     object type
+ *     count
+ *     object type
+ *     count
+ *
+ * ACPI_PTYPE1_VAR: Variable length:
+ *    object type (Int/Buf/Ref)
+ *
+ * ACPI_PTYPE1_OPTION: Package has some required and some optional elements:
+ *      Used for _PRW
+ *
+ *
+ * 2) PTYPE2 packages contain a variable number of sub-packages. Each of the
+ *    different types describe the contents of each of the sub-packages.
+ *
+ * ACPI_PTYPE2: Each subpackage contains 1 or 2 object types:
+ *     object type
+ *     count
+ *     object type
+ *     count
+ *
+ * ACPI_PTYPE2_COUNT: Each subpackage has a count as first element:
+ *     object type
+ *
+ * ACPI_PTYPE2_PKG_COUNT: Count of subpackages at start, 1 or 2 object types:
+ *     object type
+ *     count
+ *     object type
+ *     count
+ *
+ * ACPI_PTYPE2_FIXED: Each subpackage is of fixed length:
+ *      Used for _PRT
+ *
+ * ACPI_PTYPE2_MIN: Each subpackage has a variable but minimum length
+ *      Used for _HPX
+ *
+ *****************************************************************************/
+
+enum acpi_return_package_types {
+        ACPI_PTYPE1_FIXED = 1,
+        ACPI_PTYPE1_VAR = 2,
+        ACPI_PTYPE1_OPTION = 3,
+        ACPI_PTYPE2 = 4,
+        ACPI_PTYPE2_COUNT = 5,
+        ACPI_PTYPE2_PKG_COUNT = 6,
+        ACPI_PTYPE2_FIXED = 7,
+        ACPI_PTYPE2_MIN = 8
+};
+
+/*
+ * Predefined method/object information table.
+ *
+ * These are the names that can actually be evaluated via acpi_evaluate_object.
+ * Not present in this table are the following:
+ *
+ *      1) Predefined/Reserved names that are never evaluated via acpi_evaluate_object:
+ *          _Lxx and _Exx GPE methods
+ *          _Qxx EC methods
+ *          _T_x compiler temporary variables
+ *
+ *      2) Predefined names that never actually exist within the AML code:
+ *          Predefined resource descriptor field names
+ *
+ *      3) Predefined names that are implemented within ACPICA:
+ *          _OSI
+ *
+ *      4) Some predefined names that are not documented within the ACPI spec.
+ *          _WDG, _WED
+ *
+ * The main entries in the table each contain the following items:
+ *
+ * Name                 - The ACPI reserved name
+ * param_count          - Number of arguments to the method
+ * expected_btypes      - Allowed type(s) for the return value.
+ *                        0 means that no return value is expected.
+ *
+ * For methods that return packages, the next entry in the table contains
+ * information about the expected structure of the package. This information
+ * is saved here (rather than in a separate table) in order to minimize the
+ * overall size of the stored data.
+ */
+static const union acpi_predefined_info predefined_names[] = {
+        {.info = {"_AC0", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC1", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC2", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC3", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC4", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC5", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC6", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC7", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC8", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AC9", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_ADR", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_AL0", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL1", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL2", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL3", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL4", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL5", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL6", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL7", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL8", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_AL9", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_ALC", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_ALI", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_ALP", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_ALR", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2, ACPI_RTYPE_INTEGER, 2, 0, 0, 0}}, /* variable (Pkgs) each 2 (Ints) */
+        {.info = {"_ALT", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_BBN", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_BCL", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 0, 0, 0, 0}},     /* variable (Ints) */
+        {.info = {"_BCM", 1, 0}},
+        {.info = {"_BDN", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_BFS", 1, 0}},
+        {.info = {"_BIF", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_INTEGER,
+                                          9,
+                                          ACPI_RTYPE_STRING, 4, 0}},    /* fixed (9 Int),(4 Str) */
+        {.info = {"_BLT", 3, 0}},
+        {.info = {"_BMC", 1, 0}},
+        {.info = {"_BMD", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_INTEGER, 5, 0, 0, 0}},   /* fixed (5 Int) */
+        {.info = {"_BQC", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_BST", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_INTEGER, 4, 0, 0, 0}},   /* fixed (4 Int) */
+        {.info = {"_BTM", 1, ACPI_RTYPE_INTEGER}},
+        {.info = {"_BTP", 1, 0}},
+        {.info = {"_CBA", 0, ACPI_RTYPE_INTEGER}},      /* see PCI firmware spec 3.0 */
+        {.info = {"_CID", 0,
+         ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_PACKAGE}},
+        {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING, 0, 0, 0, 0}},    /* variable (Ints/Strs) */
+        {.info = {"_CRS", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_CRT", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_CSD", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2_COUNT, ACPI_RTYPE_INTEGER, 0, 0, 0, 0}},   /* variable (1 Int(n), n-1 Int) */
+        {.info = {"_CST", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2_PKG_COUNT,
+                                          ACPI_RTYPE_BUFFER, 1,
+                                          ACPI_RTYPE_INTEGER, 3, 0}},   /* variable (1 Int(n), n Pkg (1 Buf/3 Int) */
+        {.info = {"_DCK", 1, ACPI_RTYPE_INTEGER}},
+        {.info = {"_DCS", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_DDC", 1, ACPI_RTYPE_INTEGER | ACPI_RTYPE_BUFFER}},
+        {.info = {"_DDN", 0, ACPI_RTYPE_STRING}},
+        {.info = {"_DGS", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_DIS", 0, 0}},
+        {.info = {"_DMA", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_DOD", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 0, 0, 0, 0}},     /* variable (Ints) */
+        {.info = {"_DOS", 1, 0}},
+        {.info = {"_DSM", 4, ACPI_RTYPE_ALL}},  /* Must return a type, but it can be of any type */
+        {.info = {"_DSS", 1, 0}},
+        {.info = {"_DSW", 3, 0}},
+        {.info = {"_EC_", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_EDL", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_EJ0", 1, 0}},
+        {.info = {"_EJ1", 1, 0}},
+        {.info = {"_EJ2", 1, 0}},
+        {.info = {"_EJ3", 1, 0}},
+        {.info = {"_EJ4", 1, 0}},
+        {.info = {"_EJD", 0, ACPI_RTYPE_STRING}},
+        {.info = {"_FDE", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_FDI", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_INTEGER, 16, 0, 0, 0}},  /* fixed (16 Int) */
+        {.info = {"_FDM", 1, 0}},
+        {.info = {"_FIX", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 0, 0, 0, 0}},     /* variable (Ints) */
+        {.info = {"_GLK", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_GPD", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_GPE", 0, ACPI_RTYPE_INTEGER}},      /* _GPE method, not _GPE scope */
+        {.info = {"_GSB", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_GTF", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_GTM", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_GTS", 1, 0}},
+        {.info = {"_HID", 0, ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING}},
+        {.info = {"_HOT", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_HPP", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_INTEGER, 4, 0, 0, 0}},   /* fixed (4 Int) */
+
+        /*
+         * For _HPX, a single package is returned, containing a variable number of sub-packages.
+         * Each sub-package contains a PCI record setting. There are several different type of
+         * record settings, of different lengths, but all elements of all settings are Integers.
+         */
+        {.info = {"_HPX", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2_MIN, ACPI_RTYPE_INTEGER, 5, 0, 0, 0}},     /* variable (Pkgs) each (var Ints) */
+        {.info = {"_IFT", 0, ACPI_RTYPE_INTEGER}},      /* see IPMI spec */
+        {.info = {"_INI", 0, 0}},
+        {.info = {"_IRC", 0, 0}},
+        {.info = {"_LCK", 1, 0}},
+        {.info = {"_LID", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_MAT", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_MLS", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2, ACPI_RTYPE_STRING, 2, 0, 0, 0}},  /* variable (Pkgs) each (2 Str) */
+        {.info = {"_MSG", 1, 0}},
+        {.info = {"_OFF", 0, 0}},
+        {.info = {"_ON_", 0, 0}},
+        {.info = {"_OS_", 0, ACPI_RTYPE_STRING}},
+        {.info = {"_OSC", 4, ACPI_RTYPE_BUFFER}},
+        {.info = {"_OST", 3, 0}},
+        {.info = {"_PCL", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_PCT", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_BUFFER, 2, 0, 0, 0}},    /* fixed (2 Buf) */
+        {.info = {"_PDC", 1, 0}},
+        {.info = {"_PIC", 1, 0}},
+        {.info = {"_PLD", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_BUFFER, 0, 0, 0, 0}},      /* variable (Bufs) */
+        {.info = {"_PPC", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_PPE", 0, ACPI_RTYPE_INTEGER}},      /* see dig64 spec */
+        {.info = {"_PR0", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_PR1", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_PR2", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_PRS", 0, ACPI_RTYPE_BUFFER}},
+
+        /*
+         * For _PRT, many BIOSs reverse the 2nd and 3rd Package elements. This bug is so prevalent that there
+         * is code in the ACPICA Resource Manager to detect this and switch them back. For now, do not allow
+         * and issue a warning. To allow this and eliminate the warning, add the ACPI_RTYPE_REFERENCE
+         * type to the 2nd element (index 1) in the statement below.
+         */
+        {.info = {"_PRT", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2_FIXED, 4,
+                                          ACPI_RTYPE_INTEGER,
+                                          ACPI_RTYPE_INTEGER,
+                                          ACPI_RTYPE_INTEGER | ACPI_RTYPE_REFERENCE, ACPI_RTYPE_INTEGER}},      /* variable (Pkgs) each (4): Int,Int,Int/Ref,Int */
+
+        {.info = {"_PRW", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_OPTION, 2,
+                                          ACPI_RTYPE_INTEGER |
+                                          ACPI_RTYPE_PACKAGE,
+                                          ACPI_RTYPE_INTEGER, ACPI_RTYPE_REFERENCE, 0}},        /* variable (Pkgs) each: Pkg/Int,Int,[variable Refs] (Pkg is Ref/Int) */
+
+        {.info = {"_PS0", 0, 0}},
+        {.info = {"_PS1", 0, 0}},
+        {.info = {"_PS2", 0, 0}},
+        {.info = {"_PS3", 0, 0}},
+        {.info = {"_PSC", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_PSD", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2_COUNT, ACPI_RTYPE_INTEGER, 0, 0, 0, 0}},   /* variable (Pkgs) each (5 Int) with count */
+        {.info = {"_PSL", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_PSR", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_PSS", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2, ACPI_RTYPE_INTEGER, 6, 0, 0, 0}}, /* variable (Pkgs) each (6 Int) */
+        {.info = {"_PSV", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_PSW", 1, 0}},
+        {.info = {"_PTC", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_BUFFER, 2, 0, 0, 0}},    /* fixed (2 Buf) */
+        {.info = {"_PTS", 1, 0}},
+        {.info = {"_PXM", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_REG", 2, 0}},
+        {.info = {"_REV", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_RMV", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_ROM", 2, ACPI_RTYPE_BUFFER}},
+        {.info = {"_RTV", 0, ACPI_RTYPE_INTEGER}},
+
+        /*
+         * For _S0_ through _S5_, the ACPI spec defines a return Package containing 1 Integer,
+         * but most DSDTs have it wrong - 2,3, or 4 integers. Allow this by making the objects "variable length",
+         * but all elements must be Integers.
+         */
+        {.info = {"_S0_", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 1, 0, 0, 0}},     /* fixed (1 Int) */
+        {.info = {"_S1_", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 1, 0, 0, 0}},     /* fixed (1 Int) */
+        {.info = {"_S2_", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 1, 0, 0, 0}},     /* fixed (1 Int) */
+        {.info = {"_S3_", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 1, 0, 0, 0}},     /* fixed (1 Int) */
+        {.info = {"_S4_", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 1, 0, 0, 0}},     /* fixed (1 Int) */
+        {.info = {"_S5_", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_INTEGER, 1, 0, 0, 0}},     /* fixed (1 Int) */
+
+        {.info = {"_S1D", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S2D", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S3D", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S4D", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S0W", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S1W", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S2W", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S3W", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_S4W", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_SBS", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_SCP", 0x13, 0}},    /* Acpi 1.0 allowed 1 arg. Acpi 3.0 expanded to 3 args. Allow both. */
+        /* Note: the 3-arg definition may be removed for ACPI 4.0 */
+        {.info = {"_SDD", 1, 0}},
+        {.info = {"_SEG", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_SLI", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_SPD", 1, ACPI_RTYPE_INTEGER}},
+        {.info = {"_SRS", 1, 0}},
+        {.info = {"_SRV", 0, ACPI_RTYPE_INTEGER}},      /* see IPMI spec */
+        {.info = {"_SST", 1, 0}},
+        {.info = {"_STA", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_STM", 3, 0}},
+        {.info = {"_STR", 0, ACPI_RTYPE_BUFFER}},
+        {.info = {"_SUN", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_SWS", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_TC1", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_TC2", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_TMP", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_TPC", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_TPT", 1, 0}},
+        {.info = {"_TRT", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2, ACPI_RTYPE_REFERENCE, 2,
+                                          ACPI_RTYPE_INTEGER, 6, 0}},   /* variable (Pkgs) each 2_ref/6_int */
+        {.info = {"_TSD", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2_COUNT, ACPI_RTYPE_INTEGER, 5, 0, 0, 0}},   /* variable (Pkgs) each 5_int with count */
+        {.info = {"_TSP", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_TSS", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE2, ACPI_RTYPE_INTEGER, 5, 0, 0, 0}}, /* variable (Pkgs) each 5_int */
+        {.info = {"_TST", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_TTS", 1, 0}},
+        {.info = {"_TZD", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_VAR, ACPI_RTYPE_REFERENCE, 0, 0, 0, 0}},   /* variable (Refs) */
+        {.info = {"_TZM", 0, ACPI_RTYPE_REFERENCE}},
+        {.info = {"_TZP", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_UID", 0, ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING}},
+        {.info = {"_UPC", 0, ACPI_RTYPE_PACKAGE}}, {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_INTEGER, 4, 0, 0, 0}},   /* fixed (4 Int) */
+        {.info = {"_UPD", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_UPP", 0, ACPI_RTYPE_INTEGER}},
+        {.info = {"_VPO", 0, ACPI_RTYPE_INTEGER}},
+
+        /* Acpi 1.0 defined _WAK with no return value. Later, it was changed to return a package */
+
+        {.info = {"_WAK", 1, ACPI_RTYPE_NONE | ACPI_RTYPE_PACKAGE}},
+        {.ret_info = {ACPI_PTYPE1_FIXED, ACPI_RTYPE_INTEGER, 2, 0, 0, 0}},      /* fixed (2 Int), but is optional */
+        {.ret_info = {0, 0, 0, 0, 0, 0}}        /* Table terminator */
+};
+
+#if 0
+        /* Not implemented */
+
+{
+"_WDG", 0, ACPI_RTYPE_BUFFER},  /* MS Extension */
+
+{
+"_WED", 1, ACPI_RTYPE_PACKAGE}, /* MS Extension */
+
+    /* This is an internally implemented control method, no need to check */
+{
+"_OSI", 1, ACPI_RTYPE_INTEGER},
+
+    /* TBD: */
+    _PRT - currently ignore reversed entries.attempt to fix here ?
+    think about code that attempts to fix package elements like _BIF, etc.
+#endif
+#endif