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|
/******************************************************************************
*
* Module Name: amstorob - AML Interpreter object store support, store to object
* $Revision: 18 $
*
*****************************************************************************/
/*
* 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 "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "actables.h"
#define _COMPONENT INTERPRETER
MODULE_NAME ("amstorob")
/*******************************************************************************
*
* FUNCTION: Acpi_aml_store_object_to_object
*
* PARAMETERS: *Val_desc - Value to be stored
* *Dest_desc - Object to receive the value
*
* RETURN: Status
*
* DESCRIPTION: Store an object to another object.
*
* The Assignment of an object to another (not named) object
* is handled here.
* The val passed in will replace the current value (if any)
* with the input value.
*
* When storing into an object the data is converted to the
* target object type then stored in the object. This means
* that the target object type (for an initialized target) will
* not be changed by a store operation.
*
* This module allows destination types of Number, String,
* and Buffer.
*
******************************************************************************/
ACPI_STATUS
acpi_aml_store_object_to_object (
ACPI_OPERAND_OBJECT *val_desc,
ACPI_OPERAND_OBJECT *dest_desc,
ACPI_WALK_STATE *walk_state)
{
ACPI_STATUS status = AE_OK;
u8 *buffer = NULL;
u32 length = 0;
OBJECT_TYPE_INTERNAL destination_type = dest_desc->common.type;
/*
* Assuming the parameters are valid!!!
*/
ACPI_ASSERT((dest_desc) && (val_desc));
/*
* First ensure we have a value that can be stored in the target
*/
switch (destination_type)
{
/* Type of Name's existing value */
case ACPI_TYPE_NUMBER:
/*
* These cases all require only number values or values that
* can be converted to numbers.
*
* If value is not a Number, try to resolve it to one.
*/
if (val_desc->common.type != ACPI_TYPE_NUMBER) {
/*
* Initially not a number, convert
*/
status = acpi_aml_resolve_to_value (&val_desc, walk_state);
if (ACPI_SUCCESS (status) &&
(val_desc->common.type != ACPI_TYPE_NUMBER))
{
/*
* Conversion successful but still not a number
*/
status = AE_AML_OPERAND_TYPE;
}
}
break;
case ACPI_TYPE_STRING:
case ACPI_TYPE_BUFFER:
/*
* Storing into a Field in a region or into a buffer or into
* a string all is essentially the same.
*
* If value is not a valid type, try to resolve it to one.
*/
if ((val_desc->common.type != ACPI_TYPE_NUMBER) &&
(val_desc->common.type != ACPI_TYPE_BUFFER) &&
(val_desc->common.type != ACPI_TYPE_STRING))
{
/*
* Initially not a valid type, convert
*/
status = acpi_aml_resolve_to_value (&val_desc, walk_state);
if (ACPI_SUCCESS (status) &&
(val_desc->common.type != ACPI_TYPE_NUMBER) &&
(val_desc->common.type != ACPI_TYPE_BUFFER) &&
(val_desc->common.type != ACPI_TYPE_STRING))
{
/*
* Conversion successful but still not a valid type
*/
status = AE_AML_OPERAND_TYPE;
}
}
break;
default:
/*
* TBD: [Unhandled] What other combinations must be implemented?
*/
status = AE_NOT_IMPLEMENTED;
break;
}
/* Exit now if failure above */
if (ACPI_FAILURE (status)) {
goto clean_up_and_bail_out;
}
/*
* Acpi_everything is ready to execute now, We have
* a value we can handle, just perform the update
*/
switch (destination_type)
{
case ACPI_TYPE_STRING:
/*
* Perform the update
*/
switch (val_desc->common.type)
{
case ACPI_TYPE_NUMBER:
buffer = (u8 *) &val_desc->number.value;
length = sizeof (val_desc->number.value);
break;
case ACPI_TYPE_BUFFER:
buffer = (u8 *) val_desc->buffer.pointer;
length = val_desc->buffer.length;
break;
case ACPI_TYPE_STRING:
buffer = (u8 *) val_desc->string.pointer;
length = val_desc->string.length;
break;
}
/*
* Setting a string value replaces the old string
*/
if (length < dest_desc->string.length) {
/*
* Zero fill, not willing to do pointer arithmetic for
* architecture independence. Just clear the whole thing
*/
MEMSET(dest_desc->string.pointer, 0, dest_desc->string.length);
MEMCPY(dest_desc->string.pointer, buffer, length);
}
else {
/*
* Free the current buffer, then allocate a buffer
* large enough to hold the value
*/
if ( dest_desc->string.pointer &&
!acpi_tb_system_table_pointer (dest_desc->string.pointer))
{
/*
* Only free if not a pointer into the DSDT
*/
acpi_cm_free(dest_desc->string.pointer);
}
dest_desc->string.pointer = acpi_cm_allocate (length + 1);
dest_desc->string.length = length;
if (!dest_desc->string.pointer) {
status = AE_NO_MEMORY;
goto clean_up_and_bail_out;
}
MEMCPY(dest_desc->string.pointer, buffer, length);
}
break;
case ACPI_TYPE_BUFFER:
/*
* Perform the update to the buffer
*/
switch (val_desc->common.type)
{
case ACPI_TYPE_NUMBER:
buffer = (u8 *) &val_desc->number.value;
length = sizeof (val_desc->number.value);
break;
case ACPI_TYPE_BUFFER:
buffer = (u8 *) val_desc->buffer.pointer;
length = val_desc->buffer.length;
break;
case ACPI_TYPE_STRING:
buffer = (u8 *) val_desc->string.pointer;
length = val_desc->string.length;
break;
}
/*
* If the buffer is uninitialized,
* memory needs to be allocated for the copy.
*/
if(0 == dest_desc->buffer.length) {
dest_desc->buffer.pointer = acpi_cm_callocate(length);
dest_desc->buffer.length = length;
if (!dest_desc->buffer.pointer) {
status = AE_NO_MEMORY;
goto clean_up_and_bail_out;
}
}
/*
* Buffer is a static allocation,
* only place what will fit in the buffer.
*/
if (length <= dest_desc->buffer.length) {
/*
* Zero fill first, not willing to do pointer arithmetic for
* architecture independence. Just clear the whole thing
*/
MEMSET(dest_desc->buffer.pointer, 0, dest_desc->buffer.length);
MEMCPY(dest_desc->buffer.pointer, buffer, length);
}
else {
/*
* truncate, copy only what will fit
*/
MEMCPY(dest_desc->buffer.pointer, buffer, dest_desc->buffer.length);
}
break;
case ACPI_TYPE_NUMBER:
dest_desc->number.value = val_desc->number.value;
/* Truncate value if we are executing from a 32-bit ACPI table */
acpi_aml_truncate_for32bit_table (dest_desc, walk_state);
break;
default:
/*
* All other types than Alias and the various Fields come here.
* Store Val_desc as the new value of the Name, and set
* the Name's type to that of the value being stored in it.
* Val_desc reference count is incremented by Attach_object.
*/
status = AE_NOT_IMPLEMENTED;
break;
}
clean_up_and_bail_out:
return (status);
}
|
