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The condition is harmless and no need to scare the user http://bugzilla.kernel.org/show_bug.cgi?id=11245 Signed-off-by:Andi Kleen <ak@linux.intel.com>
dsobject.c 22.99 KiB
/******************************************************************************
*
* Module Name: dsobject - Dispatcher object management routines
*
*****************************************************************************/
/*
* 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.
*/
#include <acpi/acpi.h>
#include <acpi/acparser.h>
#include <acpi/amlcode.h>
#include <acpi/acdispat.h>
#include <acpi/acnamesp.h>
#include <acpi/acinterp.h>
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dsobject")
/* Local prototypes */
static acpi_status
acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
union acpi_operand_object **obj_desc_ptr);
#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
*
* FUNCTION: acpi_ds_build_internal_object
*
* PARAMETERS: walk_state - Current walk state
* Op - Parser object to be translated
* obj_desc_ptr - Where the ACPI internal object is returned
*
* RETURN: Status
* * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
* Simple objects are any objects other than a package object!
*
******************************************************************************/
static acpi_status
acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
union acpi_operand_object **obj_desc_ptr)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(ds_build_internal_object);
*obj_desc_ptr = NULL;
if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
/*
* This is a named object reference. If this name was
* previously looked up in the namespace, it was stored in this op.
* Otherwise, go ahead and look it up now
*/
if (!op->common.node) {
status = acpi_ns_lookup(walk_state->scope_info,
op->common.value.string,
ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT |
ACPI_NS_DONT_OPEN_SCOPE, NULL,
ACPI_CAST_INDIRECT_PTR(struct
acpi_namespace_node,
&(op->
common.
node)));
if (ACPI_FAILURE(status)) {
/* Check if we are resolving a named reference within a package */
if ((status == AE_NOT_FOUND)
&& (acpi_gbl_enable_interpreter_slack)
&&
((op->common.parent->common.aml_opcode ==
AML_PACKAGE_OP)
|| (op->common.parent->common.aml_opcode ==
AML_VAR_PACKAGE_OP))) {
/*
* We didn't find the target and we are populating elements
* of a package - ignore if slack enabled. Some ASL code
* contains dangling invalid references in packages and
* expects that no exception will be issued. Leave the
* element as a null element. It cannot be used, but it
* can be overwritten by subsequent ASL code - this is
* typically the case.
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Ignoring unresolved reference in package [%4.4s]\n",
walk_state->
scope_info->scope.
node->name.ascii));
return_ACPI_STATUS(AE_OK);
} else {
ACPI_ERROR_NAMESPACE(op->common.value.
string, status);
}
return_ACPI_STATUS(status);
}
}
/* Special object resolution for elements of a package */
if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode ==
AML_VAR_PACKAGE_OP)) {
/*
* Attempt to resolve the node to a value before we insert it into
* the package. If this is a reference to a common data type,
* resolve it immediately. According to the ACPI spec, package
* elements can only be "data objects" or method references.
* Attempt to resolve to an Integer, Buffer, String or Package.
* If cannot, return the named reference (for things like Devices,
* Methods, etc.) Buffer Fields and Fields will resolve to simple
* objects (int/buf/str/pkg).
*
* NOTE: References to things like Devices, Methods, Mutexes, etc.
* will remain as named references. This behavior is not described
* in the ACPI spec, but it appears to be an oversight.
*/
obj_desc =
ACPI_CAST_PTR(union acpi_operand_object,
op->common.node);
status =
acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
(struct
acpi_namespace_node,
&obj_desc),
walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
switch (op->common.node->type) {
/*
* For these types, we need the actual node, not the subobject.
* However, the subobject did not get an extra reference count above.
*
* TBD: should ex_resolve_node_to_value be changed to fix this?
*/
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_THERMAL:
acpi_ut_add_reference(op->common.node->object);
/*lint -fallthrough */
/*
* For these types, we need the actual node, not the subobject.
* The subobject got an extra reference count in ex_resolve_node_to_value.
*/
case ACPI_TYPE_MUTEX:
case ACPI_TYPE_METHOD:
case ACPI_TYPE_POWER:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_EVENT:
case ACPI_TYPE_REGION:
/* We will create a reference object for these types below */
break;
default:
/*
* All other types - the node was resolved to an actual
* object, we are done.
*/
goto exit;
}
}
}
/* Create and init a new internal ACPI object */
obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
(op->common.aml_opcode))->
object_type);
if (!obj_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
status =
acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
&obj_desc);
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
exit:
*obj_desc_ptr = obj_desc;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_build_internal_buffer_obj
*
* PARAMETERS: walk_state - Current walk state
* Op - Parser object to be translated
* buffer_length - Length of the buffer
* obj_desc_ptr - Where the ACPI internal object is returned
*
* RETURN: Status
*
* DESCRIPTION: Translate a parser Op package object to the equivalent
* namespace object
*
******************************************************************************/
acpi_status
acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
u32 buffer_length,
union acpi_operand_object **obj_desc_ptr)
{
union acpi_parse_object *arg;
union acpi_operand_object *obj_desc;
union acpi_parse_object *byte_list;
u32 byte_list_length = 0;
ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj);
/*
* If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
* The buffer object already exists (from the NS node), otherwise it must
* be created.
*/
obj_desc = *obj_desc_ptr;
if (!obj_desc) {
/* Create a new buffer object */
obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
*obj_desc_ptr = obj_desc;
if (!obj_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
}
/*
* Second arg is the buffer data (optional) byte_list can be either * individual bytes or a string initializer. In either case, a
* byte_list appears in the AML.
*/
arg = op->common.value.arg; /* skip first arg */
byte_list = arg->named.next;
if (byte_list) {
if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
ACPI_ERROR((AE_INFO,
"Expecting bytelist, got AML opcode %X in op %p",
byte_list->common.aml_opcode, byte_list));
acpi_ut_remove_reference(obj_desc);
return (AE_TYPE);
}
byte_list_length = (u32) byte_list->common.value.integer;
}
/*
* The buffer length (number of bytes) will be the larger of:
* 1) The specified buffer length and
* 2) The length of the initializer byte list
*/
obj_desc->buffer.length = buffer_length;
if (byte_list_length > buffer_length) {
obj_desc->buffer.length = byte_list_length;
}
/* Allocate the buffer */
if (obj_desc->buffer.length == 0) {
obj_desc->buffer.pointer = NULL;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Buffer defined with zero length in AML, creating\n"));
} else {
obj_desc->buffer.pointer =
ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length);
if (!obj_desc->buffer.pointer) {
acpi_ut_delete_object_desc(obj_desc);
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Initialize buffer from the byte_list (if present) */
if (byte_list) {
ACPI_MEMCPY(obj_desc->buffer.pointer,
byte_list->named.data, byte_list_length);
}
}
obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_build_internal_package_obj
*
* PARAMETERS: walk_state - Current walk state
* Op - Parser object to be translated
* element_count - Number of elements in the package - this is
* the num_elements argument to Package()
* obj_desc_ptr - Where the ACPI internal object is returned
*
* RETURN: Status
*
* DESCRIPTION: Translate a parser Op package object to the equivalent
* namespace object *
* NOTE: The number of elements in the package will be always be the num_elements
* count, regardless of the number of elements in the package list. If
* num_elements is smaller, only that many package list elements are used.
* if num_elements is larger, the Package object is padded out with
* objects of type Uninitialized (as per ACPI spec.)
*
* Even though the ASL compilers do not allow num_elements to be smaller
* than the Package list length (for the fixed length package opcode), some
* BIOS code modifies the AML on the fly to adjust the num_elements, and
* this code compensates for that. This also provides compatibility with
* other AML interpreters.
*
******************************************************************************/
acpi_status
acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
u32 element_count,
union acpi_operand_object **obj_desc_ptr)
{
union acpi_parse_object *arg;
union acpi_parse_object *parent;
union acpi_operand_object *obj_desc = NULL;
acpi_status status = AE_OK;
unsigned i;
u16 index;
u16 reference_count;
ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);
/* Find the parent of a possibly nested package */
parent = op->common.parent;
while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
(parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
parent = parent->common.parent;
}
/*
* If we are evaluating a Named package object "Name (xxxx, Package)",
* the package object already exists, otherwise it must be created.
*/
obj_desc = *obj_desc_ptr;
if (!obj_desc) {
obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
*obj_desc_ptr = obj_desc;
if (!obj_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
obj_desc->package.node = parent->common.node;
}
/*
* Allocate the element array (array of pointers to the individual
* objects) based on the num_elements parameter. Add an extra pointer slot
* so that the list is always null terminated.
*/
obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
element_count +
1) * sizeof(void *));
if (!obj_desc->package.elements) {
acpi_ut_delete_object_desc(obj_desc);
return_ACPI_STATUS(AE_NO_MEMORY);
}
obj_desc->package.count = element_count;
/*
* Initialize the elements of the package, up to the num_elements count.
* Package is automatically padded with uninitialized (NULL) elements
* if num_elements is greater than the package list length. Likewise,
* Package is truncated if num_elements is less than the list length.
*/
arg = op->common.value.arg;
arg = arg->common.next;
for (i = 0; arg && (i < element_count); i++) {
if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
if (arg->common.node->type == ACPI_TYPE_METHOD) {
/*
* A method reference "looks" to the parser to be a method
* invocation, so we special case it here
*/
arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
status =
acpi_ds_build_internal_object(walk_state,
arg,
&obj_desc->
package.
elements[i]);
} else {
/* This package element is already built, just get it */
obj_desc->package.elements[i] =
ACPI_CAST_PTR(union acpi_operand_object,
arg->common.node);
}
} else {
status = acpi_ds_build_internal_object(walk_state, arg,
&obj_desc->
package.
elements[i]);
}
if (*obj_desc_ptr) {
/* Existing package, get existing reference count */
reference_count =
(*obj_desc_ptr)->common.reference_count;
if (reference_count > 1) {
/* Make new element ref count match original ref count */
for (index = 0; index < (reference_count - 1);
index++) {
acpi_ut_add_reference((obj_desc->
package.
elements[i]));
}
}
}
arg = arg->common.next;
}
/* Check for match between num_elements and actual length of package_list */
if (arg) {
/*
* num_elements was exhausted, but there are remaining elements in the
* package_list.
*
* Note: technically, this is an error, from ACPI spec: "It is an error
* for NumElements to be less than the number of elements in the
* PackageList". However, for now, we just print an error message and
* no exception is returned.
*/ while (arg) {
/* Find out how many elements there really are */
i++;
arg = arg->common.next;
}
ACPI_WARNING((AE_INFO,
"Package List length (%X) larger than NumElements count (%X), truncated\n",
i, element_count));
} else if (i < element_count) {
/*
* Arg list (elements) was exhausted, but we did not reach num_elements count.
* Note: this is not an error, the package is padded out with NULLs.
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Package List length (%X) smaller than NumElements count (%X), padded with null elements\n",
i, element_count));
}
obj_desc->package.flags |= AOPOBJ_DATA_VALID;
op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_node
*
* PARAMETERS: walk_state - Current walk state
* Node - NS Node to be initialized
* Op - Parser object to be translated
*
* RETURN: Status
*
* DESCRIPTION: Create the object to be associated with a namespace node
*
******************************************************************************/
acpi_status
acpi_ds_create_node(struct acpi_walk_state *walk_state,
struct acpi_namespace_node *node,
union acpi_parse_object *op)
{
acpi_status status;
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);
/*
* Because of the execution pass through the non-control-method
* parts of the table, we can arrive here twice. Only init
* the named object node the first time through
*/
if (acpi_ns_get_attached_object(node)) {
return_ACPI_STATUS(AE_OK);
}
if (!op->common.value.arg) {
/* No arguments, there is nothing to do */
return_ACPI_STATUS(AE_OK);
}
/* Build an internal object for the argument(s) */
status = acpi_ds_build_internal_object(walk_state, op->common.value.arg,
&obj_desc); if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Re-type the object according to its argument */
node->type = ACPI_GET_OBJECT_TYPE(obj_desc);
/* Attach obj to node */
status = acpi_ns_attach_object(node, obj_desc, node->type);
/* Remove local reference to the object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
#endif /* ACPI_NO_METHOD_EXECUTION */
/*******************************************************************************
*
* FUNCTION: acpi_ds_init_object_from_op
*
* PARAMETERS: walk_state - Current walk state
* Op - Parser op used to init the internal object
* Opcode - AML opcode associated with the object
* ret_obj_desc - Namespace object to be initialized
*
* RETURN: Status
*
* DESCRIPTION: Initialize a namespace object from a parser Op and its
* associated arguments. The namespace object is a more compact
* representation of the Op and its arguments.
*
******************************************************************************/
acpi_status
acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
u16 opcode,
union acpi_operand_object **ret_obj_desc)
{
const struct acpi_opcode_info *op_info;
union acpi_operand_object *obj_desc;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ds_init_object_from_op);
obj_desc = *ret_obj_desc;
op_info = acpi_ps_get_opcode_info(opcode);
if (op_info->class == AML_CLASS_UNKNOWN) {
/* Unknown opcode */
return_ACPI_STATUS(AE_TYPE);
}
/* Perform per-object initialization */
switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
case ACPI_TYPE_BUFFER:
/*
* Defer evaluation of Buffer term_arg operand
*/
obj_desc->buffer.node =
ACPI_CAST_PTR(struct acpi_namespace_node,
walk_state->operands[0]);
obj_desc->buffer.aml_start = op->named.data; obj_desc->buffer.aml_length = op->named.length;
break;
case ACPI_TYPE_PACKAGE:
/*
* Defer evaluation of Package term_arg operand
*/
obj_desc->package.node =
ACPI_CAST_PTR(struct acpi_namespace_node,
walk_state->operands[0]);
obj_desc->package.aml_start = op->named.data;
obj_desc->package.aml_length = op->named.length;
break;
case ACPI_TYPE_INTEGER:
switch (op_info->type) {
case AML_TYPE_CONSTANT:
/*
* Resolve AML Constants here - AND ONLY HERE!
* All constants are integers.
* We mark the integer with a flag that indicates that it started
* life as a constant -- so that stores to constants will perform
* as expected (noop). zero_op is used as a placeholder for optional
* target operands.
*/
obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
switch (opcode) {
case AML_ZERO_OP:
obj_desc->integer.value = 0;
break;
case AML_ONE_OP:
obj_desc->integer.value = 1;
break;
case AML_ONES_OP:
obj_desc->integer.value = ACPI_INTEGER_MAX;
/* Truncate value if we are executing from a 32-bit ACPI table */
#ifndef ACPI_NO_METHOD_EXECUTION
acpi_ex_truncate_for32bit_table(obj_desc);
#endif
break;
case AML_REVISION_OP:
obj_desc->integer.value = ACPI_CA_VERSION;
break;
default:
ACPI_ERROR((AE_INFO,
"Unknown constant opcode %X",
opcode));
status = AE_AML_OPERAND_TYPE;
break;
}
break;
case AML_TYPE_LITERAL:
obj_desc->integer.value = op->common.value.integer;
#ifndef ACPI_NO_METHOD_EXECUTION acpi_ex_truncate_for32bit_table(obj_desc);
#endif
break;
default:
ACPI_ERROR((AE_INFO, "Unknown Integer type %X",
op_info->type));
status = AE_AML_OPERAND_TYPE;
break;
}
break;
case ACPI_TYPE_STRING:
obj_desc->string.pointer = op->common.value.string;
obj_desc->string.length =
(u32) ACPI_STRLEN(op->common.value.string);
/*
* The string is contained in the ACPI table, don't ever try
* to delete it
*/
obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
break;
case ACPI_TYPE_METHOD:
break;
case ACPI_TYPE_LOCAL_REFERENCE:
switch (op_info->type) {
case AML_TYPE_LOCAL_VARIABLE:
/* Split the opcode into a base opcode + offset */
obj_desc->reference.opcode = AML_LOCAL_OP;
obj_desc->reference.offset = opcode - AML_LOCAL_OP;
#ifndef ACPI_NO_METHOD_EXECUTION
status = acpi_ds_method_data_get_node(AML_LOCAL_OP,
obj_desc->
reference.offset,
walk_state,
(struct
acpi_namespace_node
**)&obj_desc->
reference.object);
#endif
break;
case AML_TYPE_METHOD_ARGUMENT:
/* Split the opcode into a base opcode + offset */
obj_desc->reference.opcode = AML_ARG_OP;
obj_desc->reference.offset = opcode - AML_ARG_OP;
#ifndef ACPI_NO_METHOD_EXECUTION
status = acpi_ds_method_data_get_node(AML_ARG_OP,
obj_desc->
reference.offset,
walk_state,
(struct
acpi_namespace_node
**)&obj_desc->
reference.object);
#endif
break;
default: /* Other literals, etc.. */
if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
/* Node was saved in Op */
obj_desc->reference.node = op->common.node;
obj_desc->reference.object =
op->common.node->object;
}
obj_desc->reference.opcode = opcode;
break;
}
break;
default:
ACPI_ERROR((AE_INFO, "Unimplemented data type: %X",
ACPI_GET_OBJECT_TYPE(obj_desc)));
status = AE_AML_OPERAND_TYPE;
break;
}
return_ACPI_STATUS(status);
}