patch-2.4.6 linux/drivers/acpi/interpreter/amfield.c

• Lines: 284
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.5/linux/drivers/acpi/interpreter/amfield.c
• Orig date: Mon Jan 29 10:15:59 2001

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/interpreter/amfield.c linux/drivers/acpi/interpreter/amfield.c
@@ -1,283 +0,0 @@
-/******************************************************************************
- *
- * Module Name: amfield - ACPI AML (p-code) execution - field manipulation
- *              $Revision: 77 $
- *
- *****************************************************************************/
-
-/*
- *  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 "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;
-
-
-	/* Parameter validation */
-
-	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);
-}
-