--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: exstore - AML Interpreter object store support
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, 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 "accommon.h"
+#include "acdispat.h"
+#include "acinterp.h"
+#include "amlcode.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_EXECUTER
+ACPI_MODULE_NAME("exstore")
+
+/* Local prototypes */
+static acpi_status
+acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
+ union acpi_operand_object *dest_desc,
+ struct acpi_walk_state *walk_state);
+
+static acpi_status
+acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
+ struct acpi_namespace_node *node,
+ struct acpi_walk_state *walk_state);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_store
+ *
+ * PARAMETERS: *source_desc - Value to be stored
+ * *dest_desc - Where to store it. Must be an NS node
+ * or union acpi_operand_object of type
+ * Reference;
+ * walk_state - Current walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Store the value described by source_desc into the location
+ * described by dest_desc. Called by various interpreter
+ * functions to store the result of an operation into
+ * the destination operand -- not just simply the actual "Store"
+ * ASL operator.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_store(union acpi_operand_object *source_desc,
+ union acpi_operand_object *dest_desc,
+ struct acpi_walk_state *walk_state)
+{
+ acpi_status status = AE_OK;
+ union acpi_operand_object *ref_desc = dest_desc;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
+
+ /* Validate parameters */
+
+ if (!source_desc || !dest_desc) {
+ ACPI_ERROR((AE_INFO, "Null parameter"));
+ return_ACPI_STATUS(AE_AML_NO_OPERAND);
+ }
+
+ /* dest_desc can be either a namespace node or an ACPI object */
+
+ if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
+ /*
+ * Dest is a namespace node,
+ * Storing an object into a Named node.
+ */
+ status = acpi_ex_store_object_to_node(source_desc,
+ (struct
+ acpi_namespace_node *)
+ dest_desc, walk_state,
+ ACPI_IMPLICIT_CONVERSION);
+
+ return_ACPI_STATUS(status);
+ }
+
+ /* Destination object must be a Reference or a Constant object */
+
+ switch (dest_desc->common.type) {
+ case ACPI_TYPE_LOCAL_REFERENCE:
+
+ break;
+
+ case ACPI_TYPE_INTEGER:
+
+ /* Allow stores to Constants -- a Noop as per ACPI spec */
+
+ if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /*lint -fallthrough */
+
+ default:
+
+ /* Destination is not a Reference object */
+
+ ACPI_ERROR((AE_INFO,
+ "Target is not a Reference or Constant object - %s [%p]",
+ acpi_ut_get_object_type_name(dest_desc),
+ dest_desc));
+
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /*
+ * Examine the Reference class. These cases are handled:
+ *
+ * 1) Store to Name (Change the object associated with a name)
+ * 2) Store to an indexed area of a Buffer or Package
+ * 3) Store to a Method Local or Arg
+ * 4) Store to the debug object
+ */
+ switch (ref_desc->reference.class) {
+ case ACPI_REFCLASS_REFOF:
+
+ /* Storing an object into a Name "container" */
+
+ status = acpi_ex_store_object_to_node(source_desc,
+ ref_desc->reference.
+ object, walk_state,
+ ACPI_IMPLICIT_CONVERSION);
+ break;
+
+ case ACPI_REFCLASS_INDEX:
+
+ /* Storing to an Index (pointer into a packager or buffer) */
+
+ status =
+ acpi_ex_store_object_to_index(source_desc, ref_desc,
+ walk_state);
+ break;
+
+ case ACPI_REFCLASS_LOCAL:
+ case ACPI_REFCLASS_ARG:
+
+ /* Store to a method local/arg */
+
+ status =
+ acpi_ds_store_object_to_local(ref_desc->reference.class,
+ ref_desc->reference.value,
+ source_desc, walk_state);
+ break;
+
+ case ACPI_REFCLASS_DEBUG:
+ /*
+ * Storing to the Debug object causes the value stored to be
+ * displayed and otherwise has no effect -- see ACPI Specification
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "**** Write to Debug Object: Object %p %s ****:\n\n",
+ source_desc,
+ acpi_ut_get_object_type_name(source_desc)));
+
+ ACPI_DEBUG_OBJECT(source_desc, 0, 0);
+ break;
+
+ default:
+
+ ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
+ ref_desc->reference.class));
+ ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
+
+ status = AE_AML_INTERNAL;
+ break;
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_store_object_to_index
+ *
+ * PARAMETERS: *source_desc - Value to be stored
+ * *dest_desc - Named object to receive the value
+ * walk_state - Current walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Store the object to indexed Buffer or Package element
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
+ union acpi_operand_object *index_desc,
+ struct acpi_walk_state *walk_state)
+{
+ acpi_status status = AE_OK;
+ union acpi_operand_object *obj_desc;
+ union acpi_operand_object *new_desc;
+ u8 value = 0;
+ u32 i;
+
+ ACPI_FUNCTION_TRACE(ex_store_object_to_index);
+
+ /*
+ * Destination must be a reference pointer, and
+ * must point to either a buffer or a package
+ */
+ switch (index_desc->reference.target_type) {
+ case ACPI_TYPE_PACKAGE:
+ /*
+ * Storing to a package element. Copy the object and replace
+ * any existing object with the new object. No implicit
+ * conversion is performed.
+ *
+ * The object at *(index_desc->Reference.Where) is the
+ * element within the package that is to be modified.
+ * The parent package object is at index_desc->Reference.Object
+ */
+ obj_desc = *(index_desc->reference.where);
+
+ if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
+ source_desc->reference.class == ACPI_REFCLASS_TABLE) {
+
+ /* This is a DDBHandle, just add a reference to it */
+
+ acpi_ut_add_reference(source_desc);
+ new_desc = source_desc;
+ } else {
+ /* Normal object, copy it */
+
+ status =
+ acpi_ut_copy_iobject_to_iobject(source_desc,
+ &new_desc,
+ walk_state);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ if (obj_desc) {
+
+ /* Decrement reference count by the ref count of the parent package */
+
+ for (i = 0; i < ((union acpi_operand_object *)
+ index_desc->reference.object)->common.
+ reference_count; i++) {
+ acpi_ut_remove_reference(obj_desc);
+ }
+ }
+
+ *(index_desc->reference.where) = new_desc;
+
+ /* Increment ref count by the ref count of the parent package-1 */
+
+ for (i = 1; i < ((union acpi_operand_object *)
+ index_desc->reference.object)->common.
+ reference_count; i++) {
+ acpi_ut_add_reference(new_desc);
+ }
+
+ break;
+
+ case ACPI_TYPE_BUFFER_FIELD:
+ /*
+ * Store into a Buffer or String (not actually a real buffer_field)
+ * at a location defined by an Index.
+ *
+ * The first 8-bit element of the source object is written to the
+ * 8-bit Buffer location defined by the Index destination object,
+ * according to the ACPI 2.0 specification.
+ */
+
+ /*
+ * Make sure the target is a Buffer or String. An error should
+ * not happen here, since the reference_object was constructed
+ * by the INDEX_OP code.
+ */
+ obj_desc = index_desc->reference.object;
+ if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
+ (obj_desc->common.type != ACPI_TYPE_STRING)) {
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /*
+ * The assignment of the individual elements will be slightly
+ * different for each source type.
+ */
+ switch (source_desc->common.type) {
+ case ACPI_TYPE_INTEGER:
+
+ /* Use the least-significant byte of the integer */
+
+ value = (u8) (source_desc->integer.value);
+ break;
+
+ case ACPI_TYPE_BUFFER:
+ case ACPI_TYPE_STRING:
+
+ /* Note: Takes advantage of common string/buffer fields */
+
+ value = source_desc->buffer.pointer[0];
+ break;
+
+ default:
+
+ /* All other types are invalid */
+
+ ACPI_ERROR((AE_INFO,
+ "Source must be Integer/Buffer/String type, not %s",
+ acpi_ut_get_object_type_name(source_desc)));
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /* Store the source value into the target buffer byte */
+
+ obj_desc->buffer.pointer[index_desc->reference.value] = value;
+ break;
+
+ default:
+ ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
+ status = AE_AML_OPERAND_TYPE;
+ break;
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_store_object_to_node
+ *
+ * PARAMETERS: source_desc - Value to be stored
+ * node - Named object to receive the value
+ * walk_state - Current walk state
+ * implicit_conversion - Perform implicit conversion (yes/no)
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Store the object to the named object.
+ *
+ * The Assignment of an object to a named object is handled here
+ * The value passed in will replace the current value (if any)
+ * with the input value.
+ *
+ * When storing into an object the data is converted to the
+ * target object type then stored in the object. This means
+ * that the target object type (for an initialized target) will
+ * not be changed by a store operation. A copy_object can change
+ * the target type, however.
+ *
+ * The implicit_conversion flag is set to NO/FALSE only when
+ * storing to an arg_x -- as per the rules of the ACPI spec.
+ *
+ * Assumes parameters are already validated.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
+ struct acpi_namespace_node *node,
+ struct acpi_walk_state *walk_state,
+ u8 implicit_conversion)
+{
+ acpi_status status = AE_OK;
+ union acpi_operand_object *target_desc;
+ union acpi_operand_object *new_desc;
+ acpi_object_type target_type;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
+
+ /* Get current type of the node, and object attached to Node */
+
+ target_type = acpi_ns_get_type(node);
+ target_desc = acpi_ns_get_attached_object(node);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p (%s) to node %p (%s)\n",
+ source_desc,
+ acpi_ut_get_object_type_name(source_desc), node,
+ acpi_ut_get_type_name(target_type)));
+
+ /*
+ * Resolve the source object to an actual value
+ * (If it is a reference object)
+ */
+ status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Do the actual store operation */
+
+ switch (target_type) {
+ case ACPI_TYPE_INTEGER:
+ case ACPI_TYPE_STRING:
+ case ACPI_TYPE_BUFFER:
+ /*
+ * The simple data types all support implicit source operand
+ * conversion before the store.
+ */
+
+ if ((walk_state->opcode == AML_COPY_OP) || !implicit_conversion) {
+ /*
+ * However, copy_object and Stores to arg_x do not perform
+ * an implicit conversion, as per the ACPI specification.
+ * A direct store is performed instead.
+ */
+ status = acpi_ex_store_direct_to_node(source_desc, node,
+ walk_state);
+ break;
+ }
+
+ /* Store with implicit source operand conversion support */
+
+ status =
+ acpi_ex_store_object_to_object(source_desc, target_desc,
+ &new_desc, walk_state);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ if (new_desc != target_desc) {
+ /*
+ * Store the new new_desc as the new value of the Name, and set
+ * the Name's type to that of the value being stored in it.
+ * source_desc reference count is incremented by attach_object.
+ *
+ * Note: This may change the type of the node if an explicit
+ * store has been performed such that the node/object type
+ * has been changed.
+ */
+ status = acpi_ns_attach_object(node, new_desc,
+ new_desc->common.type);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Store %s into %s via Convert/Attach\n",
+ acpi_ut_get_object_type_name
+ (source_desc),
+ acpi_ut_get_object_type_name
+ (new_desc)));
+ }
+ break;
+
+ case ACPI_TYPE_BUFFER_FIELD:
+ case ACPI_TYPE_LOCAL_REGION_FIELD:
+ case ACPI_TYPE_LOCAL_BANK_FIELD:
+ case ACPI_TYPE_LOCAL_INDEX_FIELD:
+ /*
+ * For all fields, always write the source data to the target
+ * field. Any required implicit source operand conversion is
+ * performed in the function below as necessary. Note, field
+ * objects must retain their original type permanently.
+ */
+ status = acpi_ex_write_data_to_field(source_desc, target_desc,
+ &walk_state->result_obj);
+ break;
+
+ default:
+ /*
+ * No conversions for all other types. Directly store a copy of
+ * the source object. This is the ACPI spec-defined behavior for
+ * the copy_object operator.
+ *
+ * NOTE: For the Store operator, this is a departure from the
+ * ACPI spec, which states "If conversion is impossible, abort
+ * the running control method". Instead, this code implements
+ * "If conversion is impossible, treat the Store operation as
+ * a CopyObject".
+ */
+ status = acpi_ex_store_direct_to_node(source_desc, node,
+ walk_state);
+ break;
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_store_direct_to_node
+ *
+ * PARAMETERS: source_desc - Value to be stored
+ * node - Named object to receive the value
+ * walk_state - Current walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: "Store" an object directly to a node. This involves a copy
+ * and an attach.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
+ struct acpi_namespace_node *node,
+ struct acpi_walk_state *walk_state)
+{
+ acpi_status status;
+ union acpi_operand_object *new_desc;
+
+ ACPI_FUNCTION_TRACE(ex_store_direct_to_node);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Storing [%s] (%p) directly into node [%s] (%p)"
+ " with no implicit conversion\n",
+ acpi_ut_get_object_type_name(source_desc),
+ source_desc, acpi_ut_get_type_name(node->type),
+ node));
+
+ /* Copy the source object to a new object */
+
+ status =
+ acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc, walk_state);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Attach the new object to the node */
+
+ status = acpi_ns_attach_object(node, new_desc, new_desc->common.type);
+ acpi_ut_remove_reference(new_desc);
+ return_ACPI_STATUS(status);
+}
Code Review / kvmfornfv.git / blobdiff