dsopcode.c

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/******************************************************************************
 *
 * Module Name: dsopcode - Dispatcher Op Region support and handling of
 *                         "control" opcodes
 *              $Revision: 28 $
 *
 *****************************************************************************/

/*
 *  Copyright (C) 2000 R. Byron Moore
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "acpi.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"
#include "actables.h"

#define _COMPONENT          DISPATCHER
	 MODULE_NAME         ("dsopcode")


/*****************************************************************************
 *
 * FUNCTION:    Acpi_ds_get_field_unit_arguments
 *
 * PARAMETERS:  Obj_desc        - A valid Field_unit object
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Get Field_unit Buffer and Index. This implements the late
 *              evaluation of these field attributes.
 *
 ****************************************************************************/

ACPI_STATUS
acpi_ds_get_field_unit_arguments (
	ACPI_OPERAND_OBJECT     *obj_desc)
{
	ACPI_OPERAND_OBJECT     *extra_desc;
	ACPI_NAMESPACE_NODE     *node;
	ACPI_PARSE_OBJECT       *op;
	ACPI_PARSE_OBJECT       *field_op;
	ACPI_STATUS             status;
	ACPI_TABLE_DESC         *table_desc;


	if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
		return (AE_OK);
	}


	/* Get the AML pointer (method object) and Field_unit node */

	extra_desc = obj_desc->field_unit.extra;
	node = obj_desc->field_unit.node;


	/*
	 * Allocate a new parser op to be the root of the parsed
	 * Op_region tree
	 */

	op = acpi_ps_alloc_op (AML_SCOPE_OP);
	if (!op) {
		return (AE_NO_MEMORY);
	}

	/* Save the Node for use in Acpi_ps_parse_aml */

	op->node = acpi_ns_get_parent_object (node);

	/* Get a handle to the parent ACPI table */

	status = acpi_tb_handle_to_object (node->owner_id, &table_desc);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/* Pass1: Parse the entire Field_unit declaration */

	status = acpi_ps_parse_aml (op, extra_desc->extra.pcode,
			  extra_desc->extra.pcode_length, 0,
			  NULL, NULL, NULL, acpi_ds_load1_begin_op, acpi_ds_load1_end_op);
	if (ACPI_FAILURE (status)) {
		acpi_ps_delete_parse_tree (op);
		return (status);
	}


	/* Get and init the actual Fiel_unit_op created above */

	field_op = op->value.arg;
	op->node = node;


	field_op = op->value.arg;
	field_op->node = node;
	acpi_ps_delete_parse_tree (op);

	/* Acpi_evaluate the address and length arguments for the Op_region */

	op = acpi_ps_alloc_op (AML_SCOPE_OP);
	if (!op) {
		return (AE_NO_MEMORY);
	}

	op->node = acpi_ns_get_parent_object (node);

	status = acpi_ps_parse_aml (op, extra_desc->extra.pcode,
			  extra_desc->extra.pcode_length,
			  ACPI_PARSE_EXECUTE | ACPI_PARSE_DELETE_TREE,
			  NULL /*Method_desc*/, NULL, NULL,
			  acpi_ds_exec_begin_op, acpi_ds_exec_end_op);
	/* All done with the parse tree, delete it */

	acpi_ps_delete_parse_tree (op);


	/*
	 * The pseudo-method object is no longer needed since the region is
	 * now initialized
	 */
	acpi_cm_remove_reference (obj_desc->field_unit.extra);
	obj_desc->field_unit.extra = NULL;

	return (status);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_ds_get_region_arguments
 *
 * PARAMETERS:  Obj_desc        - A valid region object
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Get region address and length.  This implements the late
 *              evaluation of these region attributes.
 *
 ****************************************************************************/

ACPI_STATUS
acpi_ds_get_region_arguments (
	ACPI_OPERAND_OBJECT     *obj_desc)
{
	ACPI_OPERAND_OBJECT     *extra_desc = NULL;
	ACPI_NAMESPACE_NODE     *node;
	ACPI_PARSE_OBJECT       *op;
	ACPI_PARSE_OBJECT       *region_op;
	ACPI_STATUS             status;
	ACPI_TABLE_DESC         *table_desc;


	if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
		return (AE_OK);
	}


	/* Get the AML pointer (method object) and region node */

	extra_desc = obj_desc->region.extra;
	node = obj_desc->region.node;

	/*
	 * Allocate a new parser op to be the root of the parsed
	 * Op_region tree
	 */

	op = acpi_ps_alloc_op (AML_SCOPE_OP);
	if (!op) {
		return (AE_NO_MEMORY);
	}

	/* Save the Node for use in Acpi_ps_parse_aml */

	op->node = acpi_ns_get_parent_object (node);

	/* Get a handle to the parent ACPI table */

	status = acpi_tb_handle_to_object (node->owner_id, &table_desc);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/* Parse the entire Op_region declaration, creating a parse tree */

	status = acpi_ps_parse_aml (op, extra_desc->extra.pcode,
			  extra_desc->extra.pcode_length, 0,
			  NULL, NULL, NULL, acpi_ds_load1_begin_op, acpi_ds_load1_end_op);

	if (ACPI_FAILURE (status)) {
		acpi_ps_delete_parse_tree (op);
		return (status);
	}


	/* Get and init the actual Region_op created above */

	region_op = op->value.arg;
	op->node = node;


	region_op = op->value.arg;
	region_op->node = node;
	acpi_ps_delete_parse_tree (op);

	/* Acpi_evaluate the address and length arguments for the Op_region */

	op = acpi_ps_alloc_op (AML_SCOPE_OP);
	if (!op) {
		return (AE_NO_MEMORY);
	}

	op->node = acpi_ns_get_parent_object (node);

	status = acpi_ps_parse_aml (op, extra_desc->extra.pcode,
			  extra_desc->extra.pcode_length,
			  ACPI_PARSE_EXECUTE | ACPI_PARSE_DELETE_TREE,
			  NULL /*Method_desc*/, NULL, NULL,
			  acpi_ds_exec_begin_op, acpi_ds_exec_end_op);

	/* All done with the parse tree, delete it */

	acpi_ps_delete_parse_tree (op);

	return (status);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_ds_initialize_region
 *
 * PARAMETERS:  Op              - A valid region Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION:
 *
 ****************************************************************************/

ACPI_STATUS
acpi_ds_initialize_region (
	ACPI_HANDLE             obj_handle)
{
	ACPI_OPERAND_OBJECT     *obj_desc;
	ACPI_STATUS             status;


	obj_desc = acpi_ns_get_attached_object (obj_handle);

	/* Namespace is NOT locked */

	status = acpi_ev_initialize_region (obj_desc, FALSE);

	return (status);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_ds_eval_field_unit_operands
 *
 * PARAMETERS:  Op              - A valid Field_unit Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get Field_unit Buffer and Index
 *              Called from Acpi_ds_exec_end_op during Field_unit parse tree walk
 *
 ****************************************************************************/

ACPI_STATUS
acpi_ds_eval_field_unit_operands (
	ACPI_WALK_STATE         *walk_state,
	ACPI_PARSE_OBJECT       *op)
{
	ACPI_STATUS             status;
	ACPI_OPERAND_OBJECT     *field_desc;
	ACPI_NAMESPACE_NODE     *node;
	ACPI_PARSE_OBJECT       *next_op;
	u32                     offset;
	u32                     bit_offset;
	u16                     bit_count;


	ACPI_OPERAND_OBJECT     *res_desc = NULL;
	ACPI_OPERAND_OBJECT     *cnt_desc = NULL;
	ACPI_OPERAND_OBJECT     *off_desc = NULL;
	ACPI_OPERAND_OBJECT     *src_desc = NULL;
	u32                     num_operands = 3;


	/*
	 * This is where we evaluate the address and length fields of the Op_field_unit declaration
	 */

	node =  op->node;

	/* Next_op points to the op that holds the Buffer */
	next_op = op->value.arg;

	/* Acpi_evaluate/create the address and length operands */

	status = acpi_ds_create_operands (walk_state, next_op);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	field_desc = acpi_ns_get_attached_object (node);
	if (!field_desc) {
		return (AE_NOT_EXIST);
	}


	/* Resolve the operands */

	status = acpi_aml_resolve_operands (op->opcode, WALK_OPERANDS, walk_state);

	/* Get the operands */

	status |= acpi_ds_obj_stack_pop_object (&res_desc, walk_state);
	if (AML_CREATE_FIELD_OP == op->opcode) {
		num_operands = 4;
		status |= acpi_ds_obj_stack_pop_object (&cnt_desc, walk_state);
	}

	status |= acpi_ds_obj_stack_pop_object (&off_desc, walk_state);
	status |= acpi_ds_obj_stack_pop_object (&src_desc, walk_state);

	if (ACPI_FAILURE (status)) {
		/* Invalid parameters on object stack  */

		goto cleanup;
	}


	offset = (u32) off_desc->number.value;


	/*
	 * If Res_desc is a Name, it will be a direct name pointer after
	 * Acpi_aml_resolve_operands()
	 */

	if (!VALID_DESCRIPTOR_TYPE (res_desc, ACPI_DESC_TYPE_NAMED)) {
		status = AE_AML_OPERAND_TYPE;
		goto cleanup;
	}


	/*
	 * Setup the Bit offsets and counts, according to the opcode
	 */

	switch (op->opcode)
	{

	/* Def_create_bit_field */

	case AML_BIT_FIELD_OP:

		/* Offset is in bits, Field is a bit */

		bit_offset = offset;
		bit_count = 1;
		break;


	/* Def_create_byte_field */

	case AML_BYTE_FIELD_OP:

		/* Offset is in bytes, field is a byte */

		bit_offset = 8 * offset;
		bit_count = 8;
		break;


	/* Def_create_word_field */

	case AML_WORD_FIELD_OP:

		/* Offset is in bytes, field is a word */

		bit_offset = 8 * offset;
		bit_count = 16;
		break;


	/* Def_create_dWord_field */

	case AML_DWORD_FIELD_OP:

		/* Offset is in bytes, field is a dword */

		bit_offset = 8 * offset;
		bit_count = 32;
		break;


	/* Def_create_field */

	case AML_CREATE_FIELD_OP:

		/* Offset is in bits, count is in bits */

		bit_offset = offset;
		bit_count = (u16) cnt_desc->number.value;
		break;


	default:

		status = AE_AML_BAD_OPCODE;
		goto cleanup;
	}