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/******************************************************************************
*
* Module Name: amprep - ACPI AML (p-code) execution - field prep utilities
* $Revision: 73 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 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 "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acparser.h"
#define _COMPONENT INTERPRETER
MODULE_NAME ("amprep")
/*******************************************************************************
*
* FUNCTION: Acpi_aml_decode_field_access_type
*
* PARAMETERS: Access - Encoded field access bits
*
* RETURN: Field granularity (8, 16, or 32)
*
* DESCRIPTION: Decode the Access_type bits of a field definition.
*
******************************************************************************/
static u32
acpi_aml_decode_field_access_type (
u32 access,
u16 length)
{
switch (access)
{
case ACCESS_ANY_ACC:
if (length <= 8) {
return (8);
}
else if (length <= 16) {
return (16);
}
else if (length <= 32) {
return (32);
}
else {
return (8);
}
break;
case ACCESS_BYTE_ACC:
return (8);
break;
case ACCESS_WORD_ACC:
return (16);
break;
case ACCESS_DWORD_ACC:
return (32);
break;
default:
/* Invalid field access type */
return (0);
}
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_prep_common_field_objec
*
* PARAMETERS: Obj_desc - The field object
* Field_flags - Access, Lock_rule, or Update_rule.
* The format of a Field_flag is described
* in the ACPI specification
* Field_position - Field position
* Field_length - Field length
*
* RETURN: Status
*
* DESCRIPTION: Initialize the areas of the field object that are common
* to the various types of fields.
*
******************************************************************************/
static ACPI_STATUS
acpi_aml_prep_common_field_object (
ACPI_OPERAND_OBJECT *obj_desc,
u8 field_flags,
u8 field_attribute,
u32 field_position,
u32 field_length)
{
u32 granularity;
/*
* Note: the structure being initialized is the
* ACPI_COMMON_FIELD_INFO; Therefore, we can just use the Field union to
* access this common area. No structure fields outside of the common area
* are initialized by this procedure.
*/
/* Decode the Field_flags */
obj_desc->field.access = (u8) ((field_flags & ACCESS_TYPE_MASK)
>> ACCESS_TYPE_SHIFT);
obj_desc->field.lock_rule = (u8) ((field_flags & LOCK_RULE_MASK)
>> LOCK_RULE_SHIFT);
obj_desc->field.update_rule = (u8) ((field_flags & UPDATE_RULE_MASK)
>> UPDATE_RULE_SHIFT);
/* Other misc fields */
obj_desc->field.length = (u16) field_length;
obj_desc->field.access_attribute = field_attribute;
/* Decode the access type so we can compute offsets */
granularity = acpi_aml_decode_field_access_type (obj_desc->field.access, obj_desc->field.length);
if (!granularity) {
return (AE_AML_OPERAND_VALUE);
}
/* Access granularity based fields */
obj_desc->field.granularity = (u8) granularity;
obj_desc->field.bit_offset = (u8) (field_position % granularity);
obj_desc->field.offset = (u32) field_position / granularity;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_prep_def_field_value
*
* PARAMETERS: Node - Owning Node
* Region - Region in which field is being defined
* Field_flags - Access, Lock_rule, or Update_rule.
* The format of a Field_flag is described
* in the ACPI specification
* Field_position - Field position
* Field_length - Field length
*
* RETURN: Status
*
* DESCRIPTION: Construct an ACPI_OPERAND_OBJECT of type Def_field and
* connect it to the parent Node.
*
******************************************************************************/
ACPI_STATUS
acpi_aml_prep_def_field_value (
ACPI_NAMESPACE_NODE *node,
ACPI_HANDLE region,
u8 field_flags,
u8 field_attribute,
u32 field_position,
u32 field_length)
{
ACPI_OPERAND_OBJECT *obj_desc;
u32 type;
ACPI_STATUS status;
/* Parameter validation */
if (!region) {
return (AE_AML_NO_OPERAND);
}
type = acpi_ns_get_type (region);
if (type != ACPI_TYPE_REGION) {
return (AE_AML_OPERAND_TYPE);
}
/* Allocate a new object */
obj_desc = acpi_cm_create_internal_object (INTERNAL_TYPE_DEF_FIELD);
if (!obj_desc) {
return (AE_NO_MEMORY);
}
/* Obj_desc and Region valid */
/* Initialize areas of the object that are common to all fields */
status = acpi_aml_prep_common_field_object (obj_desc, field_flags, field_attribute,
field_position, field_length);
if (ACPI_FAILURE (status)) {
return (status);
}
/* Initialize areas of the object that are specific to this field type */
obj_desc->field.container = acpi_ns_get_attached_object (region);
/* An additional reference for the container */
acpi_cm_add_reference (obj_desc->field.container);
/* Debug info */
/*
* Store the constructed descriptor (Obj_desc) into the Named_obj whose
* handle is on TOS, preserving the current type of that Named_obj.
*/
status = acpi_ns_attach_object ((ACPI_HANDLE) node, obj_desc,
(u8) acpi_ns_get_type ((ACPI_HANDLE) node));
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_prep_bank_field_value
*
* PARAMETERS: Node - Owning Node
* Region - Region in which field is being defined
* Bank_reg - Bank selection register
* Bank_val - Value to store in selection register
* Field_flags - Access, Lock_rule, or Update_rule
* Field_position - Field position
* Field_length - Field length
*
* RETURN: Status
*
* DESCRIPTION: Construct an ACPI_OPERAND_OBJECT of type Bank_field and
* connect it to the parent Node.
*
******************************************************************************/
ACPI_STATUS
acpi_aml_prep_bank_field_value (
ACPI_NAMESPACE_NODE *node,
ACPI_HANDLE region,
ACPI_HANDLE bank_reg,
u32 bank_val,
u8 field_flags,
u8 field_attribute,
u32 field_position,
u32 field_length)
{
ACPI_OPERAND_OBJECT *obj_desc;
u32 type;
ACPI_STATUS status;
/* Parameter validation */
if (!region) {
return (AE_AML_NO_OPERAND);
}
type = acpi_ns_get_type (region);
if (type != ACPI_TYPE_REGION) {
return (AE_AML_OPERAND_TYPE);
}
/* Allocate a new object */
obj_desc = acpi_cm_create_internal_object (INTERNAL_TYPE_BANK_FIELD);
if (!obj_desc) {
return (AE_NO_MEMORY);
}
/* Obj_desc and Region valid */
/* Initialize areas of the object that are common to all fields */
status = acpi_aml_prep_common_field_object (obj_desc, field_flags, field_attribute,
field_position, field_length);
if (ACPI_FAILURE (status)) {
return (status);
}
/* Initialize areas of the object that are specific to this field type */
obj_desc->bank_field.value = bank_val;
obj_desc->bank_field.container = acpi_ns_get_attached_object (region);
obj_desc->bank_field.bank_select = acpi_ns_get_attached_object (bank_reg);
/* An additional reference for the container and bank select */
/* TBD: [Restructure] is "Bank_select" ever a real internal object?? */
acpi_cm_add_reference (obj_desc->bank_field.container);
acpi_cm_add_reference (obj_desc->bank_field.bank_select);
/* Debug info */
/*
* Store the constructed descriptor (Obj_desc) into the Named_obj whose
* handle is on TOS, preserving the current type of that Named_obj.
*/
status = acpi_ns_attach_object ((ACPI_HANDLE) node, obj_desc,
(u8) acpi_ns_get_type ((ACPI_HANDLE) node));
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_prep_index_field_value
*
* PARAMETERS: Node - Owning Node
* Index_reg - Index register
* Data_reg - Data register
* Field_flags - Access, Lock_rule, or Update_rule
* Field_position - Field position
* Field_length - Field length
*
* RETURN: Status
*
* DESCRIPTION: Construct an ACPI_OPERAND_OBJECT of type Index_field and
* connect it to the parent Node.
*
******************************************************************************/
ACPI_STATUS
acpi_aml_prep_index_field_value (
ACPI_NAMESPACE_NODE *node,
ACPI_HANDLE index_reg,
ACPI_HANDLE data_reg,
u8 field_flags,
u8 field_attribute,
u32 field_position,
u32 field_length)
{
ACPI_OPERAND_OBJECT *obj_desc;
ACPI_STATUS status;
/* Parameter validation */
if (!index_reg || !data_reg) {
return (AE_AML_NO_OPERAND);
}
/* Allocate a new object descriptor */
obj_desc = acpi_cm_create_internal_object (INTERNAL_TYPE_INDEX_FIELD);
if (!obj_desc) {
return (AE_NO_MEMORY);
}
/* Initialize areas of the object that are common to all fields */
status = acpi_aml_prep_common_field_object (obj_desc, field_flags, field_attribute,
field_position, field_length);
if (ACPI_FAILURE (status)) {
return (status);
}
/* Initialize areas of the object that are specific to this field type */
obj_desc->index_field.value = (u32) (field_position /
obj_desc->field.granularity);
obj_desc->index_field.index = index_reg;
obj_desc->index_field.data = data_reg;
/* Debug info */
/*
* Store the constructed descriptor (Obj_desc) into the Named_obj whose
* handle is on TOS, preserving the current type of that Named_obj.
*/
status = acpi_ns_attach_object ((ACPI_HANDLE) node, obj_desc,
(u8) acpi_ns_get_type ((ACPI_HANDLE) node));
return (status);
}
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