/******************************************************************************* * * FUNCTION: acpi_ds_init_callbacks * * PARAMETERS: walk_state - Current state of the parse tree walk * pass_number - 1, 2, or 3 * * RETURN: Status * * DESCRIPTION: Init walk state callbacks *
******************************************************************************/
acpi_status
acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
{
/******************************************************************************* * * FUNCTION: acpi_ds_load1_begin_op * * PARAMETERS: walk_state - Current state of the parse tree walk * out_op - Where to return op if a new one is created * * RETURN: Status * * DESCRIPTION: Descending callback used during the loading of ACPI tables. *
******************************************************************************/
switch (walk_state->opcode) { case AML_SCOPE_OP: /* * The target name of the Scope() operator must exist at this point so * that we can actually open the scope to enter new names underneath it. * Allow search-to-root for single namesegs.
*/
status =
acpi_ns_lookup(walk_state->scope_info, path, object_type,
ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
walk_state, &(node)); #ifdef ACPI_ASL_COMPILER if (status == AE_NOT_FOUND) { /* * Table disassembly: * Target of Scope() not found. Generate an External for it, and * insert the name into the namespace.
*/
acpi_dm_add_op_to_external_list(op, path,
ACPI_TYPE_DEVICE, 0, 0);
status =
acpi_ns_lookup(walk_state->scope_info, path,
object_type, ACPI_IMODE_LOAD_PASS1,
ACPI_NS_SEARCH_PARENT, walk_state,
&node);
} #endif if (ACPI_FAILURE(status)) {
ACPI_ERROR_NAMESPACE(walk_state->scope_info, path,
status);
return_ACPI_STATUS(status);
}
/* * Check to make sure that the target is * one of the opcodes that actually opens a scope
*/ switch (node->type) { case ACPI_TYPE_ANY: case ACPI_TYPE_LOCAL_SCOPE: /* Scope */ case ACPI_TYPE_DEVICE: case ACPI_TYPE_POWER: case ACPI_TYPE_PROCESSOR: case ACPI_TYPE_THERMAL:
/* These are acceptable types */ break;
case ACPI_TYPE_INTEGER: case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: /* * These types we will allow, but we will change the type. * This enables some existing code of the form: * * Name (DEB, 0) * Scope (DEB) { ... } * * Note: silently change the type here. On the second pass, * we will report a warning
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Type override - [%4.4s] had invalid type (%s) " "for Scope operator, changed to type ANY\n",
acpi_ut_get_node_name(node),
acpi_ut_get_type_name(node->type)));
case ACPI_TYPE_METHOD: /* * Allow scope change to root during execution of module-level * code. Root is typed METHOD during this time.
*/ if ((node == acpi_gbl_root_node) &&
(walk_state->
parse_flags & ACPI_PARSE_MODULE_LEVEL)) { break;
}
ACPI_FALLTHROUGH;
default:
/* All other types are an error */
ACPI_ERROR((AE_INFO, "Invalid type (%s) for target of " "Scope operator [%4.4s] (Cannot override)",
acpi_ut_get_type_name(node->type),
acpi_ut_get_node_name(node)));
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
} break;
default: /* * For all other named opcodes, we will enter the name into * the namespace. * * Setup the search flags. * Since we are entering a name into the namespace, we do not want to * enable the search-to-root upsearch. * * There are only two conditions where it is acceptable that the name * already exists: * 1) the Scope() operator can reopen a scoping object that was * previously defined (Scope, Method, Device, etc.) * 2) Whenever we are parsing a deferred opcode (op_region, Buffer, * buffer_field, or Package), the name of the object is already * in the namespace.
*/ if (walk_state->deferred_node) {
/* This name is already in the namespace, get the node */
node = walk_state->deferred_node;
status = AE_OK; break;
}
/* * If we are executing a method, do not create any namespace objects * during the load phase, only during execution.
*/ if (walk_state->method_node) {
node = NULL;
status = AE_OK; break;
}
/* * Enter the named type into the internal namespace. We enter the name * as we go downward in the parse tree. Any necessary subobjects that * involve arguments to the opcode must be created as we go back up the * parse tree later.
*/
status =
acpi_ns_lookup(walk_state->scope_info, path, object_type,
ACPI_IMODE_LOAD_PASS1, flags, walk_state,
&node); if (ACPI_FAILURE(status)) { if (status == AE_ALREADY_EXISTS) {
/* The name already exists in this scope */
if (node->flags & ANOBJ_IS_EXTERNAL) { /* * Allow one create on an object or segment that was * previously declared External
*/
node->flags &= ~ANOBJ_IS_EXTERNAL;
node->type = (u8) object_type;
/* Just retyped a node, probably will need to open a scope */
if (acpi_ns_opens_scope(object_type)) {
status =
acpi_ds_scope_stack_push
(node, object_type,
walk_state); if (ACPI_FAILURE(status)) {
return_ACPI_STATUS
(status);
}
}
if (node) { /* * Put the Node in the "op" object that the parser uses, so we * can get it again quickly when this scope is closed
*/
op->common.node = node;
op->named.name = node->name.integer;
}
/******************************************************************************* * * FUNCTION: acpi_ds_load1_end_op * * PARAMETERS: walk_state - Current state of the parse tree walk * * RETURN: Status * * DESCRIPTION: Ascending callback used during the loading of the namespace, * both control methods and everything else. *
******************************************************************************/
acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
{ union acpi_parse_object *op;
acpi_object_type object_type;
acpi_status status = AE_OK; #ifdef ACPI_ASL_COMPILER
u8 param_count; #endif
ACPI_FUNCTION_TRACE(ds_load1_end_op);
op = walk_state->op;
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
walk_state));
/* * Disassembler: handle create field operators here. * * create_buffer_field is a deferred op that is typically processed in load * pass 2. However, disassembly of control method contents walk the parse * tree with ACPI_PARSE_LOAD_PASS1 and AML_CREATE operators are processed * in a later walk. This is a problem when there is a control method that * has the same name as the AML_CREATE object. In this case, any use of the * name segment will be detected as a method call rather than a reference * to a buffer field. * * This earlier creation during disassembly solves this issue by inserting * the named object in the ACPI namespace so that references to this name * would be a name string rather than a method call.
*/ if ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) &&
(walk_state->op_info->flags & AML_CREATE)) {
status = acpi_ds_create_buffer_field(op, walk_state);
return_ACPI_STATUS(status);
}
/* We are only interested in opcodes that have an associated name */
if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
return_ACPI_STATUS(AE_OK);
}
/* Get the object type to determine if we should pop the scope */
object_type = walk_state->op_info->object_type;
if (walk_state->op_info->flags & AML_FIELD) { /* * If we are executing a method, do not create any namespace objects * during the load phase, only during execution.
*/ if (!walk_state->method_node) { if (walk_state->opcode == AML_FIELD_OP ||
walk_state->opcode == AML_BANK_FIELD_OP ||
walk_state->opcode == AML_INDEX_FIELD_OP) {
status =
acpi_ds_init_field_objects(op, walk_state);
}
}
return_ACPI_STATUS(status);
}
/* * If we are executing a method, do not create any namespace objects * during the load phase, only during execution.
*/ if (!walk_state->method_node) { if (op->common.aml_opcode == AML_REGION_OP) {
status =
acpi_ex_create_region(op->named.data,
op->named.length,
(acpi_adr_space_type)
((op->common.value.arg)->
common.value.integer),
walk_state); if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
} elseif (op->common.aml_opcode == AML_DATA_REGION_OP) {
status =
acpi_ex_create_region(op->named.data,
op->named.length,
ACPI_ADR_SPACE_DATA_TABLE,
walk_state); if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
}
if (op->common.aml_opcode == AML_NAME_OP) {
/* For Name opcode, get the object type from the argument */
if (op->common.value.arg) {
object_type = (acpi_ps_get_opcode_info((op->common.
value.arg)->
common.
aml_opcode))->
object_type;
/* Set node type if we have a namespace node */
if (op->common.node) {
op->common.node->type = (u8) object_type;
}
}
} #ifdef ACPI_ASL_COMPILER /* * For external opcode, get the object type from the argument and * get the parameter count from the argument's next.
*/ if (acpi_gbl_disasm_flag &&
op->common.node && op->common.aml_opcode == AML_EXTERNAL_OP) { /* * Note, if this external is not a method * Op->Common.Value.Arg->Common.Next->Common.Value.Integer == 0 * Therefore, param_count will be 0.
*/
param_count =
(u8)op->common.value.arg->common.next->common.value.integer;
object_type = (u8)op->common.value.arg->common.value.integer;
op->common.node->flags |= ANOBJ_IS_EXTERNAL;
op->common.node->type = (u8)object_type;
/* * Add the external to the external list because we may be * emitting code based off of the items within the external list.
*/
acpi_dm_add_op_to_external_list(op, op->named.path,
(u8)object_type, param_count,
ACPI_EXT_ORIGIN_FROM_OPCODE |
ACPI_EXT_RESOLVED_REFERENCE);
} #endif
/* * If we are executing a method, do not create any namespace objects * during the load phase, only during execution.
*/ if (!walk_state->method_node) { if (op->common.aml_opcode == AML_METHOD_OP) { /* * method_op pkg_length name_string method_flags term_list * * Note: We must create the method node/object pair as soon as we * see the method declaration. This allows later pass1 parsing * of invocations of the method (need to know the number of * arguments.)
*/
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
walk_state, op, op->named.node));
if (!acpi_ns_get_attached_object(op->named.node)) {
walk_state->operands[0] =
ACPI_CAST_PTR(void, op->named.node);
walk_state->num_operands = 1;
status =
acpi_ds_create_operands(walk_state,
op->common.value.
arg); if (ACPI_SUCCESS(status)) {
status =
acpi_ex_create_method(op->named.
data,
op->named.
length,
walk_state);
}
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