psparse.c

h内核

 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
 *              a tree of ops.
 *
 ******************************************************************************/

acpi_status
acpi_ps_parse_loop (
	struct acpi_walk_state          *walk_state)
{
	acpi_status                     status = AE_OK;
	union acpi_parse_object         *op = NULL;     /* current op */
	union acpi_parse_object         *arg = NULL;
	union acpi_parse_object         *pre_op = NULL;
	struct acpi_parse_state         *parser_state;
	u8                              *aml_op_start = NULL;


	ACPI_FUNCTION_TRACE_PTR ("ps_parse_loop", walk_state);

	if (walk_state->descending_callback == NULL) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	parser_state = &walk_state->parser_state;
	walk_state->arg_types = 0;

#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
	if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
		/* We are restarting a preempted control method */

		if (acpi_ps_has_completed_scope (parser_state)) {
			/*
			 * We must check if a predicate to an IF or WHILE statement
			 * was just completed
			 */
			if ((parser_state->scope->parse_scope.op) &&
			   ((parser_state->scope->parse_scope.op->common.aml_opcode == AML_IF_OP) ||
				(parser_state->scope->parse_scope.op->common.aml_opcode == AML_WHILE_OP)) &&
				(walk_state->control_state) &&
				(walk_state->control_state->common.state ==
					ACPI_CONTROL_PREDICATE_EXECUTING)) {
				/*
				 * A predicate was just completed, get the value of the
				 * predicate and branch based on that value
				 */
				walk_state->op = NULL;
				status = acpi_ds_get_predicate_value (walk_state, ACPI_TO_POINTER (TRUE));
				if (ACPI_FAILURE (status) &&
					((status & AE_CODE_MASK) != AE_CODE_CONTROL)) {
					if (status == AE_AML_NO_RETURN_VALUE) {
						ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
							"Invoked method did not return a value, %s\n",
							acpi_format_exception (status)));

					}
					ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "get_predicate Failed, %s\n",
						acpi_format_exception (status)));
					return_ACPI_STATUS (status);
				}

				status = acpi_ps_next_parse_state (walk_state, op, status);
			}

			acpi_ps_pop_scope (parser_state, &op,
				&walk_state->arg_types, &walk_state->arg_count);
			ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
		}
		else if (walk_state->prev_op) {
			/* We were in the middle of an op */

			op = walk_state->prev_op;
			walk_state->arg_types = walk_state->prev_arg_types;
		}
	}
#endif

	/*
	 * Iterative parsing loop, while there is more aml to process:
	 */
	while ((parser_state->aml < parser_state->aml_end) || (op)) {
		aml_op_start = parser_state->aml;
		if (!op) {
			/* Get the next opcode from the AML stream */

			walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
					   parser_state->aml_start);
			walk_state->opcode   = acpi_ps_peek_opcode (parser_state);

			/*
			 * First cut to determine what we have found:
			 * 1) A valid AML opcode
			 * 2) A name string
			 * 3) An unknown/invalid opcode
			 */
			walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
			switch (walk_state->op_info->class) {
			case AML_CLASS_ASCII:
			case AML_CLASS_PREFIX:
				/*
				 * Starts with a valid prefix or ASCII char, this is a name
				 * string.  Convert the bare name string to a namepath.
				 */
				walk_state->opcode = AML_INT_NAMEPATH_OP;
				walk_state->arg_types = ARGP_NAMESTRING;
				break;

			case AML_CLASS_UNKNOWN:

				/* The opcode is unrecognized.  Just skip unknown opcodes */

				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
					"Found unknown opcode %X at AML address %p offset %X, ignoring\n",
					walk_state->opcode, parser_state->aml, walk_state->aml_offset));

				ACPI_DUMP_BUFFER (parser_state->aml, 128);

				/* Assume one-byte bad opcode */

				parser_state->aml++;
				continue;

			default:

				/* Found opcode info, this is a normal opcode */

				parser_state->aml += acpi_ps_get_opcode_size (walk_state->opcode);
				walk_state->arg_types = walk_state->op_info->parse_args;
				break;
			}

			/* Create Op structure and append to parent's argument list */

			if (walk_state->op_info->flags & AML_NAMED) {
				/* Allocate a new pre_op if necessary */

				if (!pre_op) {
					pre_op = acpi_ps_alloc_op (walk_state->opcode);
					if (!pre_op) {
						status = AE_NO_MEMORY;
						goto close_this_op;
					}
				}

				pre_op->common.value.arg = NULL;
				pre_op->common.aml_opcode = walk_state->opcode;

				/*
				 * Get and append arguments until we find the node that contains
				 * the name (the type ARGP_NAME).
				 */
				while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
					  (GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME)) {
					status = acpi_ps_get_next_arg (walk_state, parser_state,
							 GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg);
					if (ACPI_FAILURE (status)) {
						goto close_this_op;
					}

					acpi_ps_append_arg (pre_op, arg);
					INCREMENT_ARG_LIST (walk_state->arg_types);
				}

				/* Make sure that we found a NAME and didn't run out of arguments */

				if (!GET_CURRENT_ARG_TYPE (walk_state->arg_types)) {
					status = AE_AML_NO_OPERAND;
					goto close_this_op;
				}

				/* We know that this arg is a name, move to next arg */

				INCREMENT_ARG_LIST (walk_state->arg_types);

				/*
				 * Find the object.  This will either insert the object into
				 * the namespace or simply look it up
				 */
				walk_state->op = NULL;

				status = walk_state->descending_callback (walk_state, &op);
				if (ACPI_FAILURE (status)) {
					ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "During name lookup/catalog, %s\n",
							acpi_format_exception (status)));
					goto close_this_op;
				}

				if (op == NULL) {
					continue;
				}

				status = acpi_ps_next_parse_state (walk_state, op, status);
				if (status == AE_CTRL_PENDING) {
					status = AE_OK;
					goto close_this_op;
				}

				if (ACPI_FAILURE (status)) {
					goto close_this_op;
				}

				acpi_ps_append_arg (op, pre_op->common.value.arg);
				acpi_gbl_depth++;

				if (op->common.aml_opcode == AML_REGION_OP) {
					/*
					 * Defer final parsing of an operation_region body,
					 * because we don't have enough info in the first pass
					 * to parse it correctly (i.e., there may be method
					 * calls within the term_arg elements of the body.)
					 *
					 * However, we must continue parsing because
					 * the opregion is not a standalone package --
					 * we don't know where the end is at this point.
					 *
					 * (Length is unknown until parse of the body complete)
					 */
					op->named.data    = aml_op_start;
					op->named.length  = 0;
				}
			}
			else {
				/* Not a named opcode, just allocate Op and append to parent */

				walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
				op = acpi_ps_alloc_op (walk_state->opcode);
				if (!op) {
					status = AE_NO_MEMORY;
					goto close_this_op;
				}

				if (walk_state->op_info->flags & AML_CREATE) {
					/*
					 * Backup to beginning of create_xXXfield declaration
					 * body_length is unknown until we parse the body
					 */
					op->named.data    = aml_op_start;
					op->named.length  = 0;
				}

				acpi_ps_append_arg (acpi_ps_get_parent_scope (parser_state), op);

				if ((walk_state->descending_callback != NULL)) {
					/*
					 * Find the object.  This will either insert the object into
					 * the namespace or simply look it up
					 */
					walk_state->op = op;

					status = walk_state->descending_callback (walk_state, &op);
					status = acpi_ps_next_parse_state (walk_state, op, status);
					if (status == AE_CTRL_PENDING) {
						status = AE_OK;
						goto close_this_op;
					}

					if (ACPI_FAILURE (status)) {
						goto close_this_op;
					}
				}
			}

			op->common.aml_offset = walk_state->aml_offset;

			if (walk_state->op_info) {
				ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
					"Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
					 (u32) op->common.aml_opcode, walk_state->op_info->name,
					 op, parser_state->aml, op->common.aml_offset));
			}
		}


		/* Start arg_count at zero because we don't know if there are any args yet */

		walk_state->arg_count = 0;

		if (walk_state->arg_types) /* Are there any arguments that must be processed? */ {
			/* Get arguments */

			switch (op->common.aml_opcode) {
			case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
			case AML_WORD_OP:       /* AML_WORDDATA_ARG */
			case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
			case AML_QWORD_OP:      /* AML_QWORDATA_ARG */
			case AML_STRING_OP:     /* AML_ASCIICHARLIST_ARG */

				/* Fill in constant or string argument directly */

				acpi_ps_get_next_simple_arg (parser_state,
					GET_CURRENT_ARG_TYPE (walk_state->arg_types), op);
				break;

			case AML_INT_NAMEPATH_OP:   /* AML_NAMESTRING_ARG */

				status = acpi_ps_get_next_namepath (walk_state, parser_state, op, 1);
				if (ACPI_FAILURE (status)) {
					goto close_this_op;
				}

				walk_state->arg_types = 0;
				break;

			default:

				/* Op is not a constant or string, append each argument to the Op */

				while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
						!walk_state->arg_count) {
					walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
							   parser_state->aml_start);
					status = acpi_ps_get_next_arg (walk_state, parser_state,
							 GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg);
					if (ACPI_FAILURE (status)) {
						goto close_this_op;
					}

					if (arg) {
						arg->common.aml_offset = walk_state->aml_offset;
						acpi_ps_append_arg (op, arg);
					}
					INCREMENT_ARG_LIST (walk_state->arg_types);
				}

				/* Special processing for certain opcodes */

				switch (op->common.aml_opcode) {
				case AML_METHOD_OP:

					/*
					 * Skip parsing of control method
					 * because we don't have enough info in the first pass
					 * to parse it correctly.
					 *
					 * Save the length and address of the body
					 */
					op->named.data   = parser_state->aml;
					op->named.length = (u32) (parser_state->pkg_end - parser_state->aml);

					/* Skip body of method */

					parser_state->aml   = parser_state->pkg_end;
					walk_state->arg_count = 0;
					break;

				case AML_BUFFER_OP:
				case AML_PACKAGE_OP:
				case AML_VAR_PACKAGE_OP:

					if ((op->common.parent) &&
						(op->common.parent->common.aml_opcode == AML_NAME_OP) &&
						(walk_state->descending_callback != acpi_ds_exec_begin_op)) {
						/*
						 * Skip parsing of Buffers and Packages
						 * because we don't have enough info in the first pass
						 * to parse them correctly.
						 */
						op->named.data   = aml_op_start;
						op->named.length = (u32) (parser_state->pkg_end - aml_op_start);

						/* Skip body */

						parser_state->aml   = parser_state->pkg_end;
						walk_state->arg_count = 0;
					}
					break;

				case AML_WHILE_OP:

					if (walk_state->control_state) {
						walk_state->control_state->control.package_end = parser_state->pkg_end;
					}
					break;

				default:

					/* No action for all other opcodes */
					break;
				}
				break;
			}
		}

		/* Check for arguments that need to be processed */

		if (walk_state->arg_count) {
			/* There are arguments (complex ones), push Op and prepare for argument */

			status = acpi_ps_push_scope (parser_state, op,
					 walk_state->arg_types, walk_state->arg_count);
			if (ACPI_FAILURE (status)) {
				goto close_this_op;
			}
			op = NULL;
			continue;
		}

		/* All arguments have been processed -- Op is complete, prepare for next */

		walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
		if (walk_state->op_info->flags & AML_NAMED) {
			if (acpi_gbl_depth) {
				acpi_gbl_depth--;
			}

			if (op->common.aml_opcode == AML_REGION_OP) {
				/*
				 * Skip parsing of control method or opregion body,
				 * because we don't have enough info in the first pass
				 * to parse them correctly.
				 *