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linux/drivers/acpi/dispatcher/dsmthdat.c
Len Brown 75a44ce00b ACPICA: update Intel copyright 
Signed-off-by: Len Brown <len.brown@intel.com>
2008-04-23 23:00:13 -04:00

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/*******************************************************************************
*
* Module Name: dsmthdat - control method arguments and local variables
*
******************************************************************************/
/*
* 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/acdispat.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>
#include <acpi/acinterp.h>
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dsmthdat")
/* Local prototypes */
static void
acpi_ds_method_data_delete_value(u16 opcode,
u32 index, struct acpi_walk_state *walk_state);
static acpi_status
acpi_ds_method_data_set_value(u16 opcode,
u32 index,
union acpi_operand_object *object,
struct acpi_walk_state *walk_state);
#ifdef ACPI_OBSOLETE_FUNCTIONS
acpi_object_type
acpi_ds_method_data_get_type(u16 opcode,
u32 index, struct acpi_walk_state *walk_state);
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_init
*
* PARAMETERS: walk_state - Current walk state object
*
* RETURN: Status
*
* DESCRIPTION: Initialize the data structures that hold the method's arguments
* and locals. The data struct is an array of namespace nodes for
* each - this allows ref_of and de_ref_of to work properly for these
* special data types.
*
* NOTES: walk_state fields are initialized to zero by the
* ACPI_ALLOCATE_ZEROED().
*
* A pseudo-Namespace Node is assigned to each argument and local
* so that ref_of() can return a pointer to the Node.
*
******************************************************************************/
void acpi_ds_method_data_init(struct acpi_walk_state *walk_state)
{
u32 i;
ACPI_FUNCTION_TRACE(ds_method_data_init);
/* Init the method arguments */
for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) {
ACPI_MOVE_32_TO_32(&walk_state->arguments[i].name,
NAMEOF_ARG_NTE);
walk_state->arguments[i].name.integer |= (i << 24);
walk_state->arguments[i].descriptor_type = ACPI_DESC_TYPE_NAMED;
walk_state->arguments[i].type = ACPI_TYPE_ANY;
walk_state->arguments[i].flags =
ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG;
}
/* Init the method locals */
for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) {
ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name,
NAMEOF_LOCAL_NTE);
walk_state->local_variables[i].name.integer |= (i << 24);
walk_state->local_variables[i].descriptor_type =
ACPI_DESC_TYPE_NAMED;
walk_state->local_variables[i].type = ACPI_TYPE_ANY;
walk_state->local_variables[i].flags =
ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL;
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_delete_all
*
* PARAMETERS: walk_state - Current walk state object
*
* RETURN: None
*
* DESCRIPTION: Delete method locals and arguments. Arguments are only
* deleted if this method was called from another method.
*
******************************************************************************/
void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state)
{
u32 index;
ACPI_FUNCTION_TRACE(ds_method_data_delete_all);
/* Detach the locals */
for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) {
if (walk_state->local_variables[index].object) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%d=%p\n",
index,
walk_state->local_variables[index].
object));
/* Detach object (if present) and remove a reference */
acpi_ns_detach_object(&walk_state->
local_variables[index]);
}
}
/* Detach the arguments */
for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) {
if (walk_state->arguments[index].object) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%d=%p\n",
index,
walk_state->arguments[index].object));
/* Detach object (if present) and remove a reference */
acpi_ns_detach_object(&walk_state->arguments[index]);
}
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_init_args
*
* PARAMETERS: *Params - Pointer to a parameter list for the method
* max_param_count - The arg count for this method
* walk_state - Current walk state object
*
* RETURN: Status
*
* DESCRIPTION: Initialize arguments for a method. The parameter list is a list
* of ACPI operand objects, either null terminated or whose length
* is defined by max_param_count.
*
******************************************************************************/
acpi_status
acpi_ds_method_data_init_args(union acpi_operand_object **params,
u32 max_param_count,
struct acpi_walk_state *walk_state)
{
acpi_status status;
u32 index = 0;
ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params);
if (!params) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"No param list passed to method\n"));
return_ACPI_STATUS(AE_OK);
}
/* Copy passed parameters into the new method stack frame */
while ((index < ACPI_METHOD_NUM_ARGS) &&
(index < max_param_count) && params[index]) {
/*
* A valid parameter.
* Store the argument in the method/walk descriptor.
* Do not copy the arg in order to implement call by reference
*/
status = acpi_ds_method_data_set_value(AML_ARG_OP, index,
params[index],
walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
index++;
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%d args passed to method\n", index));
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_get_node
*
* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
* Index - Which Local or Arg whose type to get
* walk_state - Current walk state object
* Node - Where the node is returned.
*
* RETURN: Status and node
*
* DESCRIPTION: Get the Node associated with a local or arg.
*
******************************************************************************/
acpi_status
acpi_ds_method_data_get_node(u16 opcode,
u32 index,
struct acpi_walk_state *walk_state,
struct acpi_namespace_node **node)
{
ACPI_FUNCTION_TRACE(ds_method_data_get_node);
/*
* Method Locals and Arguments are supported
*/
switch (opcode) {
case AML_LOCAL_OP:
if (index > ACPI_METHOD_MAX_LOCAL) {
ACPI_ERROR((AE_INFO,
"Local index %d is invalid (max %d)",
index, ACPI_METHOD_MAX_LOCAL));
return_ACPI_STATUS(AE_AML_INVALID_INDEX);
}
/* Return a pointer to the pseudo-node */
*node = &walk_state->local_variables[index];
break;
case AML_ARG_OP:
if (index > ACPI_METHOD_MAX_ARG) {
ACPI_ERROR((AE_INFO,
"Arg index %d is invalid (max %d)",
index, ACPI_METHOD_MAX_ARG));
return_ACPI_STATUS(AE_AML_INVALID_INDEX);
}
/* Return a pointer to the pseudo-node */
*node = &walk_state->arguments[index];
break;
default:
ACPI_ERROR((AE_INFO, "Opcode %d is invalid", opcode));
return_ACPI_STATUS(AE_AML_BAD_OPCODE);
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_set_value
*
* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
* Index - Which Local or Arg to get
* Object - Object to be inserted into the stack entry
* walk_state - Current walk state object
*
* RETURN: Status
*
* DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
* Note: There is no "implicit conversion" for locals.
*
******************************************************************************/
static acpi_status
acpi_ds_method_data_set_value(u16 opcode,
u32 index,
union acpi_operand_object *object,
struct acpi_walk_state *walk_state)
{
acpi_status status;
struct acpi_namespace_node *node;
ACPI_FUNCTION_TRACE(ds_method_data_set_value);
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"NewObj %p Opcode %X, Refs=%d [%s]\n", object,
opcode, object->common.reference_count,
acpi_ut_get_type_name(object->common.type)));
/* Get the namespace node for the arg/local */
status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Increment ref count so object can't be deleted while installed.
* NOTE: We do not copy the object in order to preserve the call by
* reference semantics of ACPI Control Method invocation.
* (See ACPI Specification 2.0_c)
*/
acpi_ut_add_reference(object);
/* Install the object */
node->object = object;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_get_value
*
* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
* Index - Which local_var or argument to get
* walk_state - Current walk state object
* dest_desc - Where Arg or Local value is returned
*
* RETURN: Status
*
* DESCRIPTION: Retrieve value of selected Arg or Local for this method
* Used only in acpi_ex_resolve_to_value().
*
******************************************************************************/
acpi_status
acpi_ds_method_data_get_value(u16 opcode,
u32 index,
struct acpi_walk_state *walk_state,
union acpi_operand_object **dest_desc)
{
acpi_status status;
struct acpi_namespace_node *node;
union acpi_operand_object *object;
ACPI_FUNCTION_TRACE(ds_method_data_get_value);
/* Validate the object descriptor */
if (!dest_desc) {
ACPI_ERROR((AE_INFO, "Null object descriptor pointer"));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Get the namespace node for the arg/local */
status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Get the object from the node */
object = node->object;
/* Examine the returned object, it must be valid. */
if (!object) {
/*
* Index points to uninitialized object.
* This means that either 1) The expected argument was
* not passed to the method, or 2) A local variable
* was referenced by the method (via the ASL)
* before it was initialized. Either case is an error.
*/
/* If slack enabled, init the local_x/arg_x to an Integer of value zero */
if (acpi_gbl_enable_interpreter_slack) {
object =
acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!object) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
object->integer.value = 0;
node->object = object;
}
/* Otherwise, return the error */
else
switch (opcode) {
case AML_ARG_OP:
ACPI_ERROR((AE_INFO,
"Uninitialized Arg[%d] at node %p",
index, node));
return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
case AML_LOCAL_OP:
ACPI_ERROR((AE_INFO,
"Uninitialized Local[%d] at node %p",
index, node));
return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
default:
ACPI_ERROR((AE_INFO,
"Not a Arg/Local opcode: %X",
opcode));
return_ACPI_STATUS(AE_AML_INTERNAL);
}
}
/*
* The Index points to an initialized and valid object.
* Return an additional reference to the object
*/
*dest_desc = object;
acpi_ut_add_reference(object);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_delete_value
*
* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
* Index - Which local_var or argument to delete
* walk_state - Current walk state object
*
* RETURN: None
*
* DESCRIPTION: Delete the entry at Opcode:Index. Inserts
* a null into the stack slot after the object is deleted.
*
******************************************************************************/
static void
acpi_ds_method_data_delete_value(u16 opcode,
u32 index, struct acpi_walk_state *walk_state)
{
acpi_status status;
struct acpi_namespace_node *node;
union acpi_operand_object *object;
ACPI_FUNCTION_TRACE(ds_method_data_delete_value);
/* Get the namespace node for the arg/local */
status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
if (ACPI_FAILURE(status)) {
return_VOID;
}
/* Get the associated object */
object = acpi_ns_get_attached_object(node);
/*
* Undefine the Arg or Local by setting its descriptor
* pointer to NULL. Locals/Args can contain both
* ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
*/
node->object = NULL;
if ((object) &&
(ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
/*
* There is a valid object.
* Decrement the reference count by one to balance the
* increment when the object was stored.
*/
acpi_ut_remove_reference(object);
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_store_object_to_local
*
* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
* Index - Which Local or Arg to set
* obj_desc - Value to be stored
* walk_state - Current walk state
*
* RETURN: Status
*
* DESCRIPTION: Store a value in an Arg or Local. The obj_desc is installed
* as the new value for the Arg or Local and the reference count
* for obj_desc is incremented.
*
******************************************************************************/
acpi_status
acpi_ds_store_object_to_local(u16 opcode,
u32 index,
union acpi_operand_object *obj_desc,
struct acpi_walk_state *walk_state)
{
acpi_status status;
struct acpi_namespace_node *node;
union acpi_operand_object *current_obj_desc;
union acpi_operand_object *new_obj_desc;
ACPI_FUNCTION_TRACE(ds_store_object_to_local);
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Opcode=%X Index=%d Obj=%p\n",
opcode, index, obj_desc));
/* Parameter validation */
if (!obj_desc) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Get the namespace node for the arg/local */
status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
current_obj_desc = acpi_ns_get_attached_object(node);
if (current_obj_desc == obj_desc) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
obj_desc));
return_ACPI_STATUS(status);
}
/*
* If the reference count on the object is more than one, we must
* take a copy of the object before we store. A reference count
* of exactly 1 means that the object was just created during the
* evaluation of an expression, and we can safely use it since it
* is not used anywhere else.
*/
new_obj_desc = obj_desc;
if (obj_desc->common.reference_count > 1) {
status =
acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/*
* If there is an object already in this slot, we either
* have to delete it, or if this is an argument and there
* is an object reference stored there, we have to do
* an indirect store!
*/
if (current_obj_desc) {
/*
* Check for an indirect store if an argument
* contains an object reference (stored as an Node).
* We don't allow this automatic dereferencing for
* locals, since a store to a local should overwrite
* anything there, including an object reference.
*
* If both Arg0 and Local0 contain ref_of (Local4):
*
* Store (1, Arg0) - Causes indirect store to local4
* Store (1, Local0) - Stores 1 in local0, overwriting
* the reference to local4
* Store (1, de_refof (Local0)) - Causes indirect store to local4
*
* Weird, but true.
*/
if (opcode == AML_ARG_OP) {
/*
* If we have a valid reference object that came from ref_of(),
* do the indirect store
*/
if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
ACPI_DESC_TYPE_OPERAND)
&& (current_obj_desc->common.type ==
ACPI_TYPE_LOCAL_REFERENCE)
&& (current_obj_desc->reference.opcode ==
AML_REF_OF_OP)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Arg (%p) is an ObjRef(Node), storing in node %p\n",
new_obj_desc,
current_obj_desc));
/*
* Store this object to the Node (perform the indirect store)
* NOTE: No implicit conversion is performed, as per the ACPI
* specification rules on storing to Locals/Args.
*/
status =
acpi_ex_store_object_to_node(new_obj_desc,
current_obj_desc->
reference.
object,
walk_state,
ACPI_NO_IMPLICIT_CONVERSION);
/* Remove local reference if we copied the object above */
if (new_obj_desc != obj_desc) {
acpi_ut_remove_reference(new_obj_desc);
}
return_ACPI_STATUS(status);
}
}
/*
* Delete the existing object
* before storing the new one
*/
acpi_ds_method_data_delete_value(opcode, index, walk_state);
}
/*
* Install the Obj descriptor (*new_obj_desc) into
* the descriptor for the Arg or Local.
* (increments the object reference count by one)
*/
status =
acpi_ds_method_data_set_value(opcode, index, new_obj_desc,
walk_state);
/* Remove local reference if we copied the object above */
if (new_obj_desc != obj_desc) {
acpi_ut_remove_reference(new_obj_desc);
}
return_ACPI_STATUS(status);
}
#ifdef ACPI_OBSOLETE_FUNCTIONS
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_data_get_type
*
* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
* Index - Which Local or Arg whose type to get
* walk_state - Current walk state object
*
* RETURN: Data type of current value of the selected Arg or Local
*
* DESCRIPTION: Get the type of the object stored in the Local or Arg
*
******************************************************************************/
acpi_object_type
acpi_ds_method_data_get_type(u16 opcode,
u32 index, struct acpi_walk_state *walk_state)
{
acpi_status status;
struct acpi_namespace_node *node;
union acpi_operand_object *object;
ACPI_FUNCTION_TRACE(ds_method_data_get_type);
/* Get the namespace node for the arg/local */
status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
if (ACPI_FAILURE(status)) {
return_VALUE((ACPI_TYPE_NOT_FOUND));
}
/* Get the object */
object = acpi_ns_get_attached_object(node);
if (!object) {
/* Uninitialized local/arg, return TYPE_ANY */
return_VALUE(ACPI_TYPE_ANY);
}
/* Get the object type */
return_VALUE(ACPI_GET_OBJECT_TYPE(object));
}
#endif
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