drivers/acpi/acpica/psloop.c - kernel/msm-4.9 - Gitiles

 /******************************************************************************
  *
  * Module Name: psloop - Main AML parse loop
  *
  *****************************************************************************/

 /*
  * Copyright (C) 2000 - 2014, 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.
  */

 /*
  * Parse the AML and build an operation tree as most interpreters, (such as
  * Perl) do. Parsing is done by hand rather than with a YACC generated parser
  * to tightly constrain stack and dynamic memory usage. Parsing is kept
  * flexible and the code fairly compact by parsing based on a list of AML
  * opcode templates in aml_op_info[].
  */

 #include <acpi/acpi.h>
 #include "accommon.h"
 #include "acparser.h"
 #include "acdispat.h"
 #include "amlcode.h"

 #define _COMPONENT          ACPI_PARSER
 ACPI_MODULE_NAME("psloop")

 /* Local prototypes */
 static acpi_status
 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
 		      u8 * aml_op_start, union acpi_parse_object *op);

 static void
 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
 			 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ps_get_arguments
  *
  * PARAMETERS:  walk_state          - Current state
  *              aml_op_start        - Op start in AML
  *              op                  - Current Op
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Get arguments for passed Op.
  *
  ******************************************************************************/

 static acpi_status
 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
 		      u8 * aml_op_start, union acpi_parse_object *op)
 {
 	acpi_status status = AE_OK;
 	union acpi_parse_object *arg = NULL;
 	const struct acpi_opcode_info *op_info;

 	ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);

 	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(&(walk_state->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,
 					      &(walk_state->parser_state), op,
 					      1);
 		if (ACPI_FAILURE(status)) {
 			return_ACPI_STATUS(status);
 		}

 		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(walk_state->parser_state.aml,
 						walk_state->parser_state.
 						aml_start);

 			status =
 			    acpi_ps_get_next_arg(walk_state,
 						 &(walk_state->parser_state),
 						 GET_CURRENT_ARG_TYPE
 						 (walk_state->arg_types), &arg);
 			if (ACPI_FAILURE(status)) {
 				return_ACPI_STATUS(status);
 			}

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

 			INCREMENT_ARG_LIST(walk_state->arg_types);
 		}

 		/*
 		 * Handle executable code at "module-level". This refers to
 		 * executable opcodes that appear outside of any control method.
 		 */
 		if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
 		    ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
 			/*
 			 * We want to skip If/Else/While constructs during Pass1 because we
 			 * want to actually conditionally execute the code during Pass2.
 			 *
 			 * Except for disassembly, where we always want to walk the
 			 * If/Else/While packages
 			 */
 			switch (op->common.aml_opcode) {
 			case AML_IF_OP:
 			case AML_ELSE_OP:
 			case AML_WHILE_OP:
 				/*
 				 * Currently supported module-level opcodes are:
 				 * IF/ELSE/WHILE. These appear to be the most common,
 				 * and easiest to support since they open an AML
 				 * package.
 				 */
 				if (walk_state->pass_number ==
 				    ACPI_IMODE_LOAD_PASS1) {
 					acpi_ps_link_module_code(op->common.
 								 parent,
 								 aml_op_start,
 								 (u32)
 								 (walk_state->
 								 parser_state.
 								 pkg_end -
 								 aml_op_start),
 								 walk_state->
 								 owner_id);
 				}

 				ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 						  "Pass1: Skipping an If/Else/While body\n"));

 				/* Skip body of if/else/while in pass 1 */

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

 			default:
 				/*
 				 * Check for an unsupported executable opcode at module
 				 * level. We must be in PASS1, the parent must be a SCOPE,
 				 * The opcode class must be EXECUTE, and the opcode must
 				 * not be an argument to another opcode.
 				 */
 				if ((walk_state->pass_number ==
 				     ACPI_IMODE_LOAD_PASS1)
 				    && (op->common.parent->common.aml_opcode ==
 					AML_SCOPE_OP)) {
 					op_info =
 					    acpi_ps_get_opcode_info(op->common.
 								    aml_opcode);
 					if ((op_info->class ==
 					     AML_CLASS_EXECUTE) && (!arg)) {
 						ACPI_WARNING((AE_INFO,
 							      "Unsupported module-level executable opcode "
 							      "0x%.2X at table offset 0x%.4X",
 							      op->common.
 							      aml_opcode,
 							      (u32)
 							      (ACPI_PTR_DIFF
 							       (aml_op_start,
 								walk_state->
 								parser_state.
 								aml_start) +
 							       sizeof(struct
 								      acpi_table_header))));
 					}
 				}
 				break;
 			}
 		}

 		/* 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 = walk_state->parser_state.aml;
 			op->named.length = (u32)
 			    (walk_state->parser_state.pkg_end -
 			     walk_state->parser_state.aml);

 			/* Skip body of method */

 			walk_state->parser_state.aml =
 			    walk_state->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->pass_number <=
 				ACPI_IMODE_LOAD_PASS2)) {
 				/*
 				 * 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)
 				    (walk_state->parser_state.pkg_end -
 				     aml_op_start);

 				/* Skip body */

 				walk_state->parser_state.aml =
 				    walk_state->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 =
 				    walk_state->parser_state.pkg_end;
 			}
 			break;

 		default:

 			/* No action for all other opcodes */

 			break;
 		}

 		break;
 	}

 	return_ACPI_STATUS(AE_OK);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ps_link_module_code
  *
  * PARAMETERS:  parent_op           - Parent parser op
  *              aml_start           - Pointer to the AML
  *              aml_length          - Length of executable AML
  *              owner_id            - owner_id of module level code
  *
  * RETURN:      None.
  *
  * DESCRIPTION: Wrap the module-level code with a method object and link the
  *              object to the global list. Note, the mutex field of the method
  *              object is used to link multiple module-level code objects.
  *
  ******************************************************************************/

 static void
 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
 			 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
 {
 	union acpi_operand_object *prev;
 	union acpi_operand_object *next;
 	union acpi_operand_object *method_obj;
 	struct acpi_namespace_node *parent_node;

 	/* Get the tail of the list */

 	prev = next = acpi_gbl_module_code_list;
 	while (next) {
 		prev = next;
 		next = next->method.mutex;
 	}

 	/*
 	 * Insert the module level code into the list. Merge it if it is
 	 * adjacent to the previous element.
 	 */
 	if (!prev ||
 	    ((prev->method.aml_start + prev->method.aml_length) != aml_start)) {

 		/* Create, initialize, and link a new temporary method object */

 		method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 		if (!method_obj) {
 			return;
 		}

 		if (parent_op->common.node) {
 			parent_node = parent_op->common.node;
 		} else {
 			parent_node = acpi_gbl_root_node;
 		}

 		method_obj->method.aml_start = aml_start;
 		method_obj->method.aml_length = aml_length;
 		method_obj->method.owner_id = owner_id;
 		method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL;

 		/*
 		 * Save the parent node in next_object. This is cheating, but we
 		 * don't want to expand the method object.
 		 */
 		method_obj->method.next_object =
 		    ACPI_CAST_PTR(union acpi_operand_object, parent_node);

 		if (!prev) {
 			acpi_gbl_module_code_list = method_obj;
 		} else {
 			prev->method.mutex = method_obj;
 		}
 	} else {
 		prev->method.aml_length += aml_length;
 	}
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ps_parse_loop
  *
  * PARAMETERS:  walk_state          - Current state
  *
  * 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 */
 	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_EXCEPTION((AE_INFO, status,
 								"Invoked method did not return a value"));
 					}

 					ACPI_EXCEPTION((AE_INFO, status,
 							"GetPredicate Failed"));
 					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) {
 			status =
 			    acpi_ps_create_op(walk_state, aml_op_start, &op);
 			if (ACPI_FAILURE(status)) {
 				if (status == AE_CTRL_PARSE_CONTINUE) {
 					continue;
 				}

 				if (status == AE_CTRL_PARSE_PENDING) {
 					status = AE_OK;
 				}

 				if (status == AE_CTRL_TERMINATE) {
 					return_ACPI_STATUS(status);
 				}

 				status =
 				    acpi_ps_complete_op(walk_state, &op,
 							status);
 				if (ACPI_FAILURE(status)) {
 					return_ACPI_STATUS(status);
 				}

 				continue;
 			}

 			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 AmlOffset %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;

 		/* Are there any arguments that must be processed? */

 		if (walk_state->arg_types) {

 			/* Get arguments */

 			status =
 			    acpi_ps_get_arguments(walk_state, aml_op_start, op);
 			if (ACPI_FAILURE(status)) {
 				status =
 				    acpi_ps_complete_op(walk_state, &op,
 							status);
 				if (ACPI_FAILURE(status)) {
 					return_ACPI_STATUS(status);
 				}

 				continue;
 			}
 		}

 		/* 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)) {
 				status =
 				    acpi_ps_complete_op(walk_state, &op,
 							status);
 				if (ACPI_FAILURE(status)) {
 					return_ACPI_STATUS(status);
 				}

 				continue;
 			}

 			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 (op->common.aml_opcode == AML_REGION_OP ||
 			    op->common.aml_opcode == AML_DATA_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.
 				 *
 				 * Completed parsing an op_region declaration, we now
 				 * know the length.
 				 */
 				op->named.length =
 				    (u32) (parser_state->aml - op->named.data);
 			}
 		}

 		if (walk_state->op_info->flags & AML_CREATE) {
 			/*
 			 * Backup to beginning of create_XXXfield declaration (1 for
 			 * Opcode)
 			 *
 			 * body_length is unknown until we parse the body
 			 */
 			op->named.length =
 			    (u32) (parser_state->aml - op->named.data);
 		}

 		if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
 			/*
 			 * Backup to beginning of bank_field declaration
 			 *
 			 * body_length is unknown until we parse the body
 			 */
 			op->named.length =
 			    (u32) (parser_state->aml - op->named.data);
 		}

 		/* This op complete, notify the dispatcher */

 		if (walk_state->ascending_callback != NULL) {
 			walk_state->op = op;
 			walk_state->opcode = op->common.aml_opcode;

 			status = walk_state->ascending_callback(walk_state);
 			status =
 			    acpi_ps_next_parse_state(walk_state, op, status);
 			if (status == AE_CTRL_PENDING) {
 				status = AE_OK;
 			}
 		}

 		status = acpi_ps_complete_op(walk_state, &op, status);
 		if (ACPI_FAILURE(status)) {
 			return_ACPI_STATUS(status);
 		}

 	}			/* while parser_state->Aml */

 	status = acpi_ps_complete_final_op(walk_state, op, status);
 	return_ACPI_STATUS(status);
 }
	/******************************************************************************
	*
	* Module Name: psloop - Main AML parse loop
	*
	*****************************************************************************/

	/*
	* Copyright (C) 2000 - 2014, 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.
	*/

	/*
	* Parse the AML and build an operation tree as most interpreters, (such as
	* Perl) do. Parsing is done by hand rather than with a YACC generated parser
	* to tightly constrain stack and dynamic memory usage. Parsing is kept
	* flexible and the code fairly compact by parsing based on a list of AML
	* opcode templates in aml_op_info[].
	*/

	#include <acpi/acpi.h>
	#include "accommon.h"
	#include "acparser.h"
	#include "acdispat.h"
	#include "amlcode.h"

	#define _COMPONENT ACPI_PARSER
	ACPI_MODULE_NAME("psloop")

	/* Local prototypes */
	static acpi_status
	acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
	u8 * aml_op_start, union acpi_parse_object *op);

	static void
	acpi_ps_link_module_code(union acpi_parse_object *parent_op,
	u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);

	/*******************************************************************************
	*
	* FUNCTION: acpi_ps_get_arguments
	*
	* PARAMETERS: walk_state - Current state
	* aml_op_start - Op start in AML
	* op - Current Op
	*
	* RETURN: Status
	*
	* DESCRIPTION: Get arguments for passed Op.
	*
	******************************************************************************/

	static acpi_status
	acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
	u8 * aml_op_start, union acpi_parse_object *op)
	{
	acpi_status status = AE_OK;
	union acpi_parse_object *arg = NULL;
	const struct acpi_opcode_info *op_info;

	ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);

	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(&(walk_state->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,
	&(walk_state->parser_state), op,
	1);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

	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(walk_state->parser_state.aml,
	walk_state->parser_state.
	aml_start);

	status =
	acpi_ps_get_next_arg(walk_state,
	&(walk_state->parser_state),
	GET_CURRENT_ARG_TYPE
	(walk_state->arg_types), &arg);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

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

	INCREMENT_ARG_LIST(walk_state->arg_types);
	}

	/*
	* Handle executable code at "module-level". This refers to
	* executable opcodes that appear outside of any control method.
	*/
	if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
	((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
	/*
	* We want to skip If/Else/While constructs during Pass1 because we
	* want to actually conditionally execute the code during Pass2.
	*
	* Except for disassembly, where we always want to walk the
	* If/Else/While packages
	*/
	switch (op->common.aml_opcode) {
	case AML_IF_OP:
	case AML_ELSE_OP:
	case AML_WHILE_OP:
	/*
	* Currently supported module-level opcodes are:
	* IF/ELSE/WHILE. These appear to be the most common,
	* and easiest to support since they open an AML
	* package.
	*/
	if (walk_state->pass_number ==
	ACPI_IMODE_LOAD_PASS1) {
	acpi_ps_link_module_code(op->common.
	parent,
	aml_op_start,
	(u32)
	(walk_state->
	parser_state.
	pkg_end -
	aml_op_start),
	walk_state->
	owner_id);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
	"Pass1: Skipping an If/Else/While body\n"));

	/* Skip body of if/else/while in pass 1 */

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

	default:
	/*
	* Check for an unsupported executable opcode at module
	* level. We must be in PASS1, the parent must be a SCOPE,
	* The opcode class must be EXECUTE, and the opcode must
	* not be an argument to another opcode.
	*/
	if ((walk_state->pass_number ==
	ACPI_IMODE_LOAD_PASS1)
	&& (op->common.parent->common.aml_opcode ==
	AML_SCOPE_OP)) {
	op_info =
	acpi_ps_get_opcode_info(op->common.
	aml_opcode);
	if ((op_info->class ==
	AML_CLASS_EXECUTE) && (!arg)) {
	ACPI_WARNING((AE_INFO,
	"Unsupported module-level executable opcode "
	"0x%.2X at table offset 0x%.4X",
	op->common.
	aml_opcode,
	(u32)
	(ACPI_PTR_DIFF
	(aml_op_start,
	walk_state->
	parser_state.
	aml_start) +
	sizeof(struct
	acpi_table_header))));
	}
	}
	break;
	}
	}

	/* 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 = walk_state->parser_state.aml;
	op->named.length = (u32)
	(walk_state->parser_state.pkg_end -
	walk_state->parser_state.aml);

	/* Skip body of method */

	walk_state->parser_state.aml =
	walk_state->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->pass_number <=
	ACPI_IMODE_LOAD_PASS2)) {
	/*
	* 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)
	(walk_state->parser_state.pkg_end -
	aml_op_start);

	/* Skip body */

	walk_state->parser_state.aml =
	walk_state->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 =
	walk_state->parser_state.pkg_end;
	}
	break;

	default:

	/* No action for all other opcodes */

	break;
	}

	break;
	}

	return_ACPI_STATUS(AE_OK);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ps_link_module_code
	*
	* PARAMETERS: parent_op - Parent parser op
	* aml_start - Pointer to the AML
	* aml_length - Length of executable AML
	* owner_id - owner_id of module level code
	*
	* RETURN: None.
	*
	* DESCRIPTION: Wrap the module-level code with a method object and link the
	* object to the global list. Note, the mutex field of the method
	* object is used to link multiple module-level code objects.
	*
	******************************************************************************/

	static void
	acpi_ps_link_module_code(union acpi_parse_object *parent_op,
	u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
	{
	union acpi_operand_object *prev;
	union acpi_operand_object *next;
	union acpi_operand_object *method_obj;
	struct acpi_namespace_node *parent_node;

	/* Get the tail of the list */

	prev = next = acpi_gbl_module_code_list;
	while (next) {
	prev = next;
	next = next->method.mutex;
	}

	/*
	* Insert the module level code into the list. Merge it if it is
	* adjacent to the previous element.
	*/
	if (!prev \|\|
	((prev->method.aml_start + prev->method.aml_length) != aml_start)) {

	/* Create, initialize, and link a new temporary method object */

	method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
	if (!method_obj) {
	return;
	}

	if (parent_op->common.node) {
	parent_node = parent_op->common.node;
	} else {
	parent_node = acpi_gbl_root_node;
	}

	method_obj->method.aml_start = aml_start;
	method_obj->method.aml_length = aml_length;
	method_obj->method.owner_id = owner_id;
	method_obj->method.info_flags \|= ACPI_METHOD_MODULE_LEVEL;

	/*
	* Save the parent node in next_object. This is cheating, but we
	* don't want to expand the method object.
	*/
	method_obj->method.next_object =
	ACPI_CAST_PTR(union acpi_operand_object, parent_node);

	if (!prev) {
	acpi_gbl_module_code_list = method_obj;
	} else {
	prev->method.mutex = method_obj;
	}
	} else {
	prev->method.aml_length += aml_length;
	}
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ps_parse_loop
	*
	* PARAMETERS: walk_state - Current state
	*
	* 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 */
	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_EXCEPTION((AE_INFO, status,
	"Invoked method did not return a value"));
	}

	ACPI_EXCEPTION((AE_INFO, status,
	"GetPredicate Failed"));
	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) {
	status =
	acpi_ps_create_op(walk_state, aml_op_start, &op);
	if (ACPI_FAILURE(status)) {
	if (status == AE_CTRL_PARSE_CONTINUE) {
	continue;
	}

	if (status == AE_CTRL_PARSE_PENDING) {
	status = AE_OK;
	}

	if (status == AE_CTRL_TERMINATE) {
	return_ACPI_STATUS(status);
	}

	status =
	acpi_ps_complete_op(walk_state, &op,
	status);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

	continue;
	}

	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 AmlOffset %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;

	/* Are there any arguments that must be processed? */

	if (walk_state->arg_types) {

	/* Get arguments */

	status =
	acpi_ps_get_arguments(walk_state, aml_op_start, op);
	if (ACPI_FAILURE(status)) {
	status =
	acpi_ps_complete_op(walk_state, &op,
	status);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

	continue;
	}
	}

	/* 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)) {
	status =
	acpi_ps_complete_op(walk_state, &op,
	status);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

	continue;
	}

	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 (op->common.aml_opcode == AML_REGION_OP \|\|
	op->common.aml_opcode == AML_DATA_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.
	*
	* Completed parsing an op_region declaration, we now
	* know the length.
	*/
	op->named.length =
	(u32) (parser_state->aml - op->named.data);
	}
	}

	if (walk_state->op_info->flags & AML_CREATE) {
	/*
	* Backup to beginning of create_XXXfield declaration (1 for
	* Opcode)
	*
	* body_length is unknown until we parse the body
	*/
	op->named.length =
	(u32) (parser_state->aml - op->named.data);
	}

	if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
	/*
	* Backup to beginning of bank_field declaration
	*
	* body_length is unknown until we parse the body
	*/
	op->named.length =
	(u32) (parser_state->aml - op->named.data);
	}

	/* This op complete, notify the dispatcher */

	if (walk_state->ascending_callback != NULL) {
	walk_state->op = op;
	walk_state->opcode = op->common.aml_opcode;

	status = walk_state->ascending_callback(walk_state);
	status =
	acpi_ps_next_parse_state(walk_state, op, status);
	if (status == AE_CTRL_PENDING) {
	status = AE_OK;
	}
	}

	status = acpi_ps_complete_op(walk_state, &op, status);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

	} /* while parser_state->Aml */

	status = acpi_ps_complete_final_op(walk_state, op, status);
	return_ACPI_STATUS(status);
	}