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/******************************************************************************
*
* Module Name: amfield - ACPI AML (p-code) execution - field manipulation
* $Revision: 74 $
*
*****************************************************************************/
/*
* 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 "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "achware.h"
#include "acevents.h"
#define _COMPONENT INTERPRETER
MODULE_NAME ("amfield")
/*******************************************************************************
*
* FUNCTION: Acpi_aml_setup_field
*
* PARAMETERS: *Obj_desc - Field to be read or written
* *Rgn_desc - Region containing field
* Field_bit_width - Field Width in bits (8, 16, or 32)
*
* RETURN: Status
*
* DESCRIPTION: Common processing for Acpi_aml_read_field and Acpi_aml_write_field
*
* ACPI SPECIFICATION REFERENCES:
* Each of the Type1_opcodes is defined as specified in in-line
* comments below. For each one, use the following definitions.
*
* Def_bit_field := Bit_field_op Src_buf Bit_idx Destination
* Def_byte_field := Byte_field_op Src_buf Byte_idx Destination
* Def_create_field := Create_field_op Src_buf Bit_idx Num_bits Name_string
* Def_dWord_field := DWord_field_op Src_buf Byte_idx Destination
* Def_word_field := Word_field_op Src_buf Byte_idx Destination
* Bit_index := Term_arg=>Integer
* Byte_index := Term_arg=>Integer
* Destination := Name_string
* Num_bits := Term_arg=>Integer
* Source_buf := Term_arg=>Buffer
*
******************************************************************************/
ACPI_STATUS
acpi_aml_setup_field (
ACPI_OPERAND_OBJECT *obj_desc,
ACPI_OPERAND_OBJECT *rgn_desc,
u32 field_bit_width)
{
ACPI_STATUS status = AE_OK;
u32 field_byte_width;
/* Parameter validation */
if (!obj_desc || !rgn_desc) {
return (AE_AML_NO_OPERAND);
}
if (ACPI_TYPE_REGION != rgn_desc->common.type) {
return (AE_AML_OPERAND_TYPE);
}
/*
* TBD: [Future] Acpi 2.0 supports Qword fields
*
* Init and validate Field width
* Possible values are 1, 2, 4
*/
field_byte_width = DIV_8 (field_bit_width);
if ((field_bit_width != 8) &&
(field_bit_width != 16) &&
(field_bit_width != 32))
{
return (AE_AML_OPERAND_VALUE);
}
/*
* If the Region Address and Length have not been previously evaluated,
* evaluate them and save the results.
*/
if (!(rgn_desc->region.flags & AOPOBJ_DATA_VALID)) {
status = acpi_ds_get_region_arguments (rgn_desc);
if (ACPI_FAILURE (status)) {
return (status);
}
}
if ((obj_desc->common.type == ACPI_TYPE_FIELD_UNIT) &&
(!(obj_desc->common.flags & AOPOBJ_DATA_VALID)))
{
/*
* Field Buffer and Index have not been previously evaluated,
*/
return (AE_AML_INTERNAL);
}
if (rgn_desc->region.length <
(obj_desc->field.offset & ~((u32) field_byte_width - 1)) +
field_byte_width)
{
/*
* Offset rounded up to next multiple of field width
* exceeds region length, indicate an error
*/
return (AE_AML_REGION_LIMIT);
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_access_named_field
*
* PARAMETERS: Mode - ACPI_READ or ACPI_WRITE
* Named_field - Handle for field to be accessed
* *Buffer - Value(s) to be read or written
* Buffer_length - Number of bytes to transfer
*
* RETURN: Status
*
* DESCRIPTION: Read or write a named field
*
******************************************************************************/
ACPI_STATUS
acpi_aml_access_named_field (
u32 mode,
ACPI_HANDLE named_field,
void *buffer,
u32 buffer_length)
{
ACPI_OPERAND_OBJECT *obj_desc = NULL;
ACPI_STATUS status = AE_OK;
u8 locked = FALSE;
u32 bit_granularity = 0;
u32 byte_granularity;
u32 datum_length;
u32 actual_byte_length;
u32 byte_field_length;
/* Basic data checking */
if ((!named_field) || (ACPI_READ == mode && !buffer)) {
return (AE_AML_INTERNAL);
}
/* Get the attached field object */
obj_desc = acpi_ns_get_attached_object (named_field);
if (!obj_desc) {
return (AE_AML_INTERNAL);
}
/* Check the type */
if (INTERNAL_TYPE_DEF_FIELD != acpi_ns_get_type (named_field)) {
return (AE_AML_OPERAND_TYPE);
}
/* Obj_desc valid and Named_field is a defined field */
/* Double-check that the attached object is also a field */
if (INTERNAL_TYPE_DEF_FIELD != obj_desc->common.type) {
return (AE_AML_OPERAND_TYPE);
}
/*
* Granularity was decoded from the field access type
* (Any_acc will be the same as Byte_acc)
*/
bit_granularity = obj_desc->field_unit.granularity;
byte_granularity = DIV_8 (bit_granularity);
/*
* Check if request is too large for the field, and silently truncate
* if necessary
*/
/* TBD: [Errors] should an error be returned in this case? */
byte_field_length = (u32) DIV_8 (obj_desc->field_unit.length + 7);
actual_byte_length = buffer_length;
if (buffer_length > byte_field_length) {
actual_byte_length = byte_field_length;
}
/* TBD: should these round down to a power of 2? */
if (DIV_8(bit_granularity) > byte_field_length) {
bit_granularity = MUL_8(byte_field_length);
}
if (byte_granularity > byte_field_length) {
byte_granularity = byte_field_length;
}
/* Convert byte count to datum count, round up if necessary */
datum_length = (actual_byte_length + (byte_granularity-1)) / byte_granularity;
/* Get the global lock if needed */
locked = acpi_aml_acquire_global_lock (obj_desc->field_unit.lock_rule);
/* Perform the actual read or write of the buffer */
switch (mode)
{
case ACPI_READ:
status = acpi_aml_read_field (obj_desc, buffer, buffer_length,
actual_byte_length, datum_length,
bit_granularity, byte_granularity);
break;
case ACPI_WRITE:
status = acpi_aml_write_field (obj_desc, buffer, buffer_length,
actual_byte_length, datum_length,
bit_granularity, byte_granularity);
break;
default:
status = AE_BAD_PARAMETER;
break;
}
/* Release global lock if we acquired it earlier */
acpi_aml_release_global_lock (locked);
return (status);
}
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