[mirror_ubuntu-artful-kernel.git] / drivers / acpi / acpica / psloop.c

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

/*
 * Copyright (C) 2000 - 2017, 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 "acinterp.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);

	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
			  "Get arguments for opcode [%s]\n",
			  op->common.aml_op_name));

	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,
						   ACPI_POSSIBLE_METHOD_CALL);
		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 = walk_state->parser_state.aml;

			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) {
				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;

	ACPI_FUNCTION_TRACE(ps_link_module_code);

	/* 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_VOID;
		}

		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Create/Link new code block: %p\n",
				  method_obj));

		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 {
		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Appending to existing code block: %p\n",
				  prev));

		prev->method.aml_length += aml_length;
	}

	return_VOID;
}

/*******************************************************************************
 *
 * 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;
			}

			acpi_ex_start_trace_opcode(op, walk_state);
		}

		/*
		 * 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);
}
Commit	Line	Data
73459f73 RM	1	/******************************************************************************
	2	*
	3	* Module Name: psloop - Main AML parse loop
	4	*
	5	*****************************************************************************/
	6
	7	/*
7735ca0e	8	* Copyright (C) 2000 - 2017, Intel Corp.
73459f73 RM	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
73459f73	44	/*
4d0b4af9 MK	45	* Parse the AML and build an operation tree as most interpreters, (such as
	46	* Perl) do. Parsing is done by hand rather than with a YACC generated parser
	47	* to tightly constrain stack and dynamic memory usage. Parsing is kept
	48	* flexible and the code fairly compact by parsing based on a list of AML
	49	* opcode templates in aml_op_info[].
73459f73 RM	50	*/
	51
	52	#include <acpi/acpi.h>
e2f7a777	53	#include "accommon.h"
ab6c5733	54	#include "acinterp.h"
e2f7a777 LB	55	#include "acparser.h"
	56	#include "acdispat.h"
	57	#include "amlcode.h"
73459f73 RM	58
73459f73 RM	59	#define _COMPONENT ACPI_PARSER
4be44fcd	60	ACPI_MODULE_NAME("psloop")
73459f73	61
4d0b4af9	62	/* Local prototypes */
4d0b4af9 MK	63	static acpi_status
	64	acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
	65	u8 * aml_op_start, union acpi_parse_object *op);
	66
7f0c826a	67	static void
9a884ab6 LM	68	acpi_ps_link_module_code(union acpi_parse_object *parent_op,
9a884ab6 LM	69	u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);
7f0c826a	70
4d0b4af9 MK	71	/*******************************************************************************
	72	*
	73	* FUNCTION: acpi_ps_get_arguments
	74	*
	75	* PARAMETERS: walk_state - Current state
	76	* aml_op_start - Op start in AML
ba494bee	77	* op - Current Op
4d0b4af9 MK	78	*
	79	* RETURN: Status
	80	*
	81	* DESCRIPTION: Get arguments for passed Op.
	82	*
	83	******************************************************************************/
	84
	85	static acpi_status
	86	acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
	87	u8 * aml_op_start, union acpi_parse_object *op)
	88	{
	89	acpi_status status = AE_OK;
	90	union acpi_parse_object *arg = NULL;
7f0c826a	91	const struct acpi_opcode_info *op_info;
4d0b4af9 MK	92
	93	ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
	94
ce87e09d BM	95	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
	96	"Get arguments for opcode [%s]\n",
	97	op->common.aml_op_name));
	98
4d0b4af9 MK	99	switch (op->common.aml_opcode) {
	100	case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
	101	case AML_WORD_OP: /* AML_WORDDATA_ARG */
	102	case AML_DWORD_OP: /* AML_DWORDATA_ARG */
	103	case AML_QWORD_OP: /* AML_QWORDATA_ARG */
	104	case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
	105
	106	/* Fill in constant or string argument directly */
	107
	108	acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
	109	GET_CURRENT_ARG_TYPE(walk_state->
	110	arg_types),
	111	op);
	112	break;
	113
	114	case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
	115
89438f96 BM	116	status = acpi_ps_get_next_namepath(walk_state,
	117	&(walk_state->parser_state),
	118	op,
	119	ACPI_POSSIBLE_METHOD_CALL);
4d0b4af9 MK	120	if (ACPI_FAILURE(status)) {
	121	return_ACPI_STATUS(status);
	122	}
	123
	124	walk_state->arg_types = 0;
	125	break;
	126
	127	default:
	128	/*
	129	* Op is not a constant or string, append each argument to the Op
	130	*/
1fad8738 BM	131	while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
1fad8738 BM	132	!walk_state->arg_count) {
83482f75	133	walk_state->aml = walk_state->parser_state.aml;
4d0b4af9 MK	134
	135	status =
	136	acpi_ps_get_next_arg(walk_state,
	137	&(walk_state->parser_state),
	138	GET_CURRENT_ARG_TYPE
	139	(walk_state->arg_types), &arg);
	140	if (ACPI_FAILURE(status)) {
	141	return_ACPI_STATUS(status);
	142	}
	143
	144	if (arg) {
4d0b4af9 MK	145	acpi_ps_append_arg(op, arg);
	146	}
	147
	148	INCREMENT_ARG_LIST(walk_state->arg_types);
	149	}
	150
7f0c826a LM	151	/*
	152	* Handle executable code at "module-level". This refers to
	153	* executable opcodes that appear outside of any control method.
	154	*/
	155	if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
4d0b4af9 MK	156	((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
	157	/*
	158	* We want to skip If/Else/While constructs during Pass1 because we
	159	* want to actually conditionally execute the code during Pass2.
	160	*
	161	* Except for disassembly, where we always want to walk the
	162	* If/Else/While packages
	163	*/
	164	switch (op->common.aml_opcode) {
	165	case AML_IF_OP:
	166	case AML_ELSE_OP:
	167	case AML_WHILE_OP:
7f0c826a LM	168	/*
	169	* Currently supported module-level opcodes are:
	170	* IF/ELSE/WHILE. These appear to be the most common,
	171	* and easiest to support since they open an AML
	172	* package.
	173	*/
	174	if (walk_state->pass_number ==
	175	ACPI_IMODE_LOAD_PASS1) {
9a884ab6 LM	176	acpi_ps_link_module_code(op->common.
	177	parent,
	178	aml_op_start,
	179	(u32)
	180	(walk_state->
7f0c826a LM	181	parser_state.
7f0c826a LM	182	pkg_end -
9a884ab6	183	aml_op_start),
7f0c826a LM	184	walk_state->
	185	owner_id);
	186	}
	187
4d0b4af9 MK	188	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
	189	"Pass1: Skipping an If/Else/While body\n"));
	190
	191	/* Skip body of if/else/while in pass 1 */
	192
	193	walk_state->parser_state.aml =
	194	walk_state->parser_state.pkg_end;
	195	walk_state->arg_count = 0;
	196	break;
	197
	198	default:
7f0c826a LM	199	/*
	200	* Check for an unsupported executable opcode at module
	201	* level. We must be in PASS1, the parent must be a SCOPE,
	202	* The opcode class must be EXECUTE, and the opcode must
	203	* not be an argument to another opcode.
	204	*/
	205	if ((walk_state->pass_number ==
	206	ACPI_IMODE_LOAD_PASS1)
	207	&& (op->common.parent->common.aml_opcode ==
	208	AML_SCOPE_OP)) {
	209	op_info =
	210	acpi_ps_get_opcode_info(op->common.
	211	aml_opcode);
	212	if ((op_info->class ==
	213	AML_CLASS_EXECUTE) && (!arg)) {
	214	ACPI_WARNING((AE_INFO,
00eb3255 BM	215	"Unsupported module-level executable opcode "
	216	"0x%.2X at table offset 0x%.4X",
	217	op->common.
	218	aml_opcode,
	219	(u32)
	220	(ACPI_PTR_DIFF
	221	(aml_op_start,
	222	walk_state->
	223	parser_state.
	224	aml_start) +
	225	sizeof(struct
	226	acpi_table_header))));
7f0c826a LM	227	}
7f0c826a LM	228	}
4d0b4af9 MK	229	break;
	230	}
	231	}
7f0c826a LM	232
7f0c826a LM	233	/* Special processing for certain opcodes */
4d0b4af9 MK	234
	235	switch (op->common.aml_opcode) {
	236	case AML_METHOD_OP:
	237	/*
	238	* Skip parsing of control method because we don't have enough
	239	* info in the first pass to parse it correctly.
	240	*
	241	* Save the length and address of the body
	242	*/
	243	op->named.data = walk_state->parser_state.aml;
	244	op->named.length = (u32)
	245	(walk_state->parser_state.pkg_end -
	246	walk_state->parser_state.aml);
	247
	248	/* Skip body of method */
	249
	250	walk_state->parser_state.aml =
	251	walk_state->parser_state.pkg_end;
	252	walk_state->arg_count = 0;
	253	break;
	254
	255	case AML_BUFFER_OP:
	256	case AML_PACKAGE_OP:
	257	case AML_VAR_PACKAGE_OP:
	258
	259	if ((op->common.parent) &&
	260	(op->common.parent->common.aml_opcode ==
	261	AML_NAME_OP)
	262	&& (walk_state->pass_number <=
	263	ACPI_IMODE_LOAD_PASS2)) {
	264	/*
	265	* Skip parsing of Buffers and Packages because we don't have
	266	* enough info in the first pass to parse them correctly.
	267	*/
	268	op->named.data = aml_op_start;
	269	op->named.length = (u32)
	270	(walk_state->parser_state.pkg_end -
	271	aml_op_start);
	272
	273	/* Skip body */
	274
	275	walk_state->parser_state.aml =
	276	walk_state->parser_state.pkg_end;
	277	walk_state->arg_count = 0;
	278	}
	279	break;
	280
	281	case AML_WHILE_OP:
	282
	283	if (walk_state->control_state) {
	284	walk_state->control_state->control.package_end =
	285	walk_state->parser_state.pkg_end;
	286	}
	287	break;
	288
	289	default:
	290
	291	/* No action for all other opcodes */
1d1ea1b7	292
4d0b4af9 MK	293	break;
	294	}
	295
	296	break;
	297	}
	298
	299	return_ACPI_STATUS(AE_OK);
	300	}
	301
7f0c826a LM	302	/*******************************************************************************
	303	*
	304	* FUNCTION: acpi_ps_link_module_code
	305	*
9a884ab6 LM	306	* PARAMETERS: parent_op - Parent parser op
9a884ab6 LM	307	* aml_start - Pointer to the AML
7f0c826a LM	308	* aml_length - Length of executable AML
	309	* owner_id - owner_id of module level code
	310	*
	311	* RETURN: None.
	312	*
	313	* DESCRIPTION: Wrap the module-level code with a method object and link the
	314	* object to the global list. Note, the mutex field of the method
	315	* object is used to link multiple module-level code objects.
	316	*
	317	******************************************************************************/
	318
	319	static void
9a884ab6 LM	320	acpi_ps_link_module_code(union acpi_parse_object *parent_op,
9a884ab6 LM	321	u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
7f0c826a LM	322	{
	323	union acpi_operand_object *prev;
	324	union acpi_operand_object *next;
	325	union acpi_operand_object *method_obj;
9a884ab6	326	struct acpi_namespace_node *parent_node;
7f0c826a	327
25823e78 BM	328	ACPI_FUNCTION_TRACE(ps_link_module_code);
25823e78 BM	329
7f0c826a LM	330	/* Get the tail of the list */
	331
	332	prev = next = acpi_gbl_module_code_list;
	333	while (next) {
	334	prev = next;
	335	next = next->method.mutex;
	336	}
	337
	338	/*
	339	* Insert the module level code into the list. Merge it if it is
	340	* adjacent to the previous element.
	341	*/
	342	if (!prev \|\|
	343	((prev->method.aml_start + prev->method.aml_length) != aml_start)) {
	344
	345	/* Create, initialize, and link a new temporary method object */
	346
	347	method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
	348	if (!method_obj) {
25823e78	349	return_VOID;
7f0c826a LM	350	}
7f0c826a LM	351
25823e78 BM	352	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
	353	"Create/Link new code block: %p\n",
	354	method_obj));
	355
9a884ab6 LM	356	if (parent_op->common.node) {
	357	parent_node = parent_op->common.node;
	358	} else {
	359	parent_node = acpi_gbl_root_node;
	360	}
	361
7f0c826a LM	362	method_obj->method.aml_start = aml_start;
	363	method_obj->method.aml_length = aml_length;
	364	method_obj->method.owner_id = owner_id;
26294842	365	method_obj->method.info_flags \|= ACPI_METHOD_MODULE_LEVEL;
7f0c826a	366
9a884ab6 LM	367	/*
	368	* Save the parent node in next_object. This is cheating, but we
	369	* don't want to expand the method object.
	370	*/
	371	method_obj->method.next_object =
	372	ACPI_CAST_PTR(union acpi_operand_object, parent_node);
	373
7f0c826a LM	374	if (!prev) {
	375	acpi_gbl_module_code_list = method_obj;
	376	} else {
	377	prev->method.mutex = method_obj;
	378	}
	379	} else {
25823e78 BM	380	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
	381	"Appending to existing code block: %p\n",
	382	prev));
	383
7f0c826a LM	384	prev->method.aml_length += aml_length;
7f0c826a LM	385	}
25823e78 BM	386
25823e78 BM	387	return_VOID;
7f0c826a LM	388	}
7f0c826a LM	389
73459f73 RM	390	/*******************************************************************************
	391	*
	392	* FUNCTION: acpi_ps_parse_loop
	393	*
	394	* PARAMETERS: walk_state - Current state
	395	*
	396	* RETURN: Status
	397	*
	398	* DESCRIPTION: Parse AML (pointed to by the current parser state) and return
	399	* a tree of ops.
	400	*
	401	******************************************************************************/
	402
4be44fcd	403	acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
73459f73	404	{
4be44fcd	405	acpi_status status = AE_OK;
4be44fcd	406	union acpi_parse_object op = NULL; / current op */
4be44fcd LB	407	struct acpi_parse_state *parser_state;
4be44fcd LB	408	u8 *aml_op_start = NULL;
73459f73	409
b229cf92	410	ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
73459f73 RM	411
73459f73 RM	412	if (walk_state->descending_callback == NULL) {
4be44fcd	413	return_ACPI_STATUS(AE_BAD_PARAMETER);
73459f73 RM	414	}
	415
	416	parser_state = &walk_state->parser_state;
	417	walk_state->arg_types = 0;
	418
	419	#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
	420
	421	if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
52fc0b02	422
73459f73 RM	423	/* We are restarting a preempted control method */
73459f73 RM	424
4be44fcd	425	if (acpi_ps_has_completed_scope(parser_state)) {
73459f73 RM	426	/*
	427	* We must check if a predicate to an IF or WHILE statement
	428	* was just completed
	429	*/
	430	if ((parser_state->scope->parse_scope.op) &&
4be44fcd LB	431	((parser_state->scope->parse_scope.op->common.
	432	aml_opcode == AML_IF_OP)
	433	\|\| (parser_state->scope->parse_scope.op->common.
	434	aml_opcode == AML_WHILE_OP))
	435	&& (walk_state->control_state)
	436	&& (walk_state->control_state->common.state ==
	437	ACPI_CONTROL_PREDICATE_EXECUTING)) {
73459f73 RM	438	/*
	439	* A predicate was just completed, get the value of the
	440	* predicate and branch based on that value
	441	*/
	442	walk_state->op = NULL;
4be44fcd LB	443	status =
	444	acpi_ds_get_predicate_value(walk_state,
	445	ACPI_TO_POINTER
	446	(TRUE));
	447	if (ACPI_FAILURE(status)
	448	&& ((status & AE_CODE_MASK) !=
	449	AE_CODE_CONTROL)) {
73459f73	450	if (status == AE_AML_NO_RETURN_VALUE) {
b8e4d893 BM	451	ACPI_EXCEPTION((AE_INFO, status,
b8e4d893 BM	452	"Invoked method did not return a value"));
73459f73	453	}
4d0b4af9	454
b8e4d893	455	ACPI_EXCEPTION((AE_INFO, status,
b229cf92	456	"GetPredicate Failed"));
4be44fcd	457	return_ACPI_STATUS(status);
73459f73 RM	458	}
73459f73 RM	459
4be44fcd LB	460	status =
	461	acpi_ps_next_parse_state(walk_state, op,
	462	status);
73459f73 RM	463	}
73459f73 RM	464
4be44fcd LB	465	acpi_ps_pop_scope(parser_state, &op,
	466	&walk_state->arg_types,
	467	&walk_state->arg_count);
	468	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
	469	"Popped scope, Op=%p\n", op));
	470	} else if (walk_state->prev_op) {
52fc0b02	471
73459f73 RM	472	/* We were in the middle of an op */
73459f73 RM	473
4d0b4af9 MK	474	op = walk_state->prev_op;
	475	walk_state->arg_types = walk_state->prev_arg_types;
	476	}
	477	}
	478	#endif
73459f73	479
4d0b4af9	480	/* Iterative parsing loop, while there is more AML to process: */
73459f73	481
4d0b4af9 MK	482	while ((parser_state->aml < parser_state->aml_end) \|\| (op)) {
	483	aml_op_start = parser_state->aml;
	484	if (!op) {
	485	status =
	486	acpi_ps_create_op(walk_state, aml_op_start, &op);
	487	if (ACPI_FAILURE(status)) {
	488	if (status == AE_CTRL_PARSE_CONTINUE) {
73459f73 RM	489	continue;
	490	}
	491
4d0b4af9	492	if (status == AE_CTRL_PARSE_PENDING) {
73459f73	493	status = AE_OK;
73459f73 RM	494	}
73459f73 RM	495
22b5afce BM	496	if (status == AE_CTRL_TERMINATE) {
	497	return_ACPI_STATUS(status);
	498	}
	499
4d0b4af9 MK	500	status =
	501	acpi_ps_complete_op(walk_state, &op,
	502	status);
4be44fcd	503	if (ACPI_FAILURE(status)) {
4d0b4af9	504	return_ACPI_STATUS(status);
73459f73 RM	505	}
73459f73 RM	506
4d0b4af9	507	continue;
73459f73 RM	508	}
73459f73 RM	509
ab6c5733	510	acpi_ex_start_trace_opcode(op, walk_state);
73459f73 RM	511	}
73459f73 RM	512
73459f73 RM	513	/*
	514	* Start arg_count at zero because we don't know if there are
	515	* any args yet
	516	*/
	517	walk_state->arg_count = 0;
	518
	519	/* Are there any arguments that must be processed? */
	520
	521	if (walk_state->arg_types) {
52fc0b02	522
73459f73 RM	523	/* Get arguments */
73459f73 RM	524
4d0b4af9 MK	525	status =
	526	acpi_ps_get_arguments(walk_state, aml_op_start, op);
	527	if (ACPI_FAILURE(status)) {
4be44fcd	528	status =
4d0b4af9 MK	529	acpi_ps_complete_op(walk_state, &op,
4d0b4af9 MK	530	status);
4be44fcd	531	if (ACPI_FAILURE(status)) {
4d0b4af9	532	return_ACPI_STATUS(status);
73459f73	533	}
73459f73	534
4d0b4af9	535	continue;
73459f73 RM	536	}
	537	}
	538
	539	/* Check for arguments that need to be processed */
	540
	541	if (walk_state->arg_count) {
	542	/*
	543	* There are arguments (complex ones), push Op and
	544	* prepare for argument
	545	*/
4be44fcd LB	546	status = acpi_ps_push_scope(parser_state, op,
	547	walk_state->arg_types,
	548	walk_state->arg_count);
	549	if (ACPI_FAILURE(status)) {
4d0b4af9 MK	550	status =
	551	acpi_ps_complete_op(walk_state, &op,
	552	status);
	553	if (ACPI_FAILURE(status)) {
	554	return_ACPI_STATUS(status);
	555	}
	556
	557	continue;
73459f73	558	}
4d0b4af9	559
73459f73 RM	560	op = NULL;
	561	continue;
	562	}
	563
	564	/*
	565	* All arguments have been processed -- Op is complete,
	566	* prepare for next
	567	*/
4be44fcd LB	568	walk_state->op_info =
4be44fcd LB	569	acpi_ps_get_opcode_info(op->common.aml_opcode);
73459f73	570	if (walk_state->op_info->flags & AML_NAMED) {
941f48bb LM	571	if (op->common.aml_opcode == AML_REGION_OP \|\|
941f48bb LM	572	op->common.aml_opcode == AML_DATA_REGION_OP) {
73459f73 RM	573	/*
	574	* Skip parsing of control method or opregion body,
	575	* because we don't have enough info in the first pass
	576	* to parse them correctly.
	577	*
	578	* Completed parsing an op_region declaration, we now
	579	* know the length.
	580	*/
4be44fcd LB	581	op->named.length =
4be44fcd LB	582	(u32) (parser_state->aml - op->named.data);
73459f73 RM	583	}
	584	}
	585
	586	if (walk_state->op_info->flags & AML_CREATE) {
	587	/*
ba494bee	588	* Backup to beginning of create_XXXfield declaration (1 for
73459f73 RM	589	* Opcode)
	590	*
	591	* body_length is unknown until we parse the body
	592	*/
4be44fcd LB	593	op->named.length =
4be44fcd LB	594	(u32) (parser_state->aml - op->named.data);
73459f73 RM	595	}
73459f73 RM	596
ef805d95 LM	597	if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
	598	/*
	599	* Backup to beginning of bank_field declaration
	600	*
	601	* body_length is unknown until we parse the body
	602	*/
	603	op->named.length =
	604	(u32) (parser_state->aml - op->named.data);
	605	}
	606
73459f73 RM	607	/* This op complete, notify the dispatcher */
	608
	609	if (walk_state->ascending_callback != NULL) {
4be44fcd	610	walk_state->op = op;
73459f73 RM	611	walk_state->opcode = op->common.aml_opcode;
73459f73 RM	612
4be44fcd LB	613	status = walk_state->ascending_callback(walk_state);
	614	status =
	615	acpi_ps_next_parse_state(walk_state, op, status);
73459f73 RM	616	if (status == AE_CTRL_PENDING) {
73459f73 RM	617	status = AE_OK;
73459f73 RM	618	}
	619	}
	620
4d0b4af9 MK	621	status = acpi_ps_complete_op(walk_state, &op, status);
4d0b4af9 MK	622	if (ACPI_FAILURE(status)) {
4be44fcd	623	return_ACPI_STATUS(status);
73459f73 RM	624	}
73459f73 RM	625
4be44fcd	626	} /* while parser_state->Aml */
73459f73	627
4d0b4af9	628	status = acpi_ps_complete_final_op(walk_state, op, status);
4be44fcd	629	return_ACPI_STATUS(status);
73459f73	630	}