/******************************************************************************* * * 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! *
******************************************************************************/
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) {
/* Check if we are resolving a named reference within a package */
if ((op->common.parent->common.aml_opcode ==
AML_PACKAGE_OP)
|| (op->common.parent->common.aml_opcode ==
AML_VARIABLE_PACKAGE_OP)) { /* * We won't resolve package elements here, we will do this * after all ACPI tables are loaded into the namespace. This * behavior supports both forward references to named objects * and external references to objects in other tables.
*/ goto create_new_object;
} else {
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)) {
ACPI_ERROR_NAMESPACE(walk_state->
scope_info,
op->common.value.
string, status);
return_ACPI_STATUS(status);
}
}
}
}
create_new_object:
/* 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);
}
/* * Handling for unresolved package reference elements. * These are elements that are namepaths.
*/ if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
obj_desc->reference.resolved = TRUE;
if ((op->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
!obj_desc->reference.node) { /* * Name was unresolved above. * Get the prefix node for later lookup
*/
obj_desc->reference.node =
walk_state->scope_info->scope.node;
obj_desc->reference.aml = op->common.aml;
obj_desc->reference.resolved = FALSE;
}
}
/******************************************************************************* * * 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;
/* * 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) {
/* * 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, found AML opcode 0x%X in op %p",
byte_list->common.aml_opcode, byte_list));
/* * 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) {
memcpy(obj_desc->buffer.pointer, byte_list->named.data,
byte_list_length);
}
}
/******************************************************************************* * * 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 = obj_desc->common.type;
/* Attach obj to node */
status = acpi_ns_attach_object(node, obj_desc, node->type);
/******************************************************************************* * * 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)
{ conststruct acpi_opcode_info *op_info; union acpi_operand_object *obj_desc;
acpi_status status = AE_OK;
case ACPI_TYPE_PACKAGE: /* * Defer evaluation of Package term_arg operand and all * package elements. (01/2017): We defer the element * resolution to allow forward references from the package * in order to provide compatibility with other ACPI * implementations.
*/
obj_desc->package.node =
ACPI_CAST_PTR(struct acpi_namespace_node,
walk_state->operands[0]);
if (!op->named.data) {
return_ACPI_STATUS(AE_OK);
}
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_UINT64_MAX;
/* Truncate value if we are executing from a 32-bit ACPI table */
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