/******************************************************************************
*
* Module Name: exconvrt - Object conversion routines
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2004, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include <acpi/acinterp.h>
#include <acpi/amlcode.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exconvrt")
/*******************************************************************************
*
* FUNCTION: acpi_ex_convert_to_integer
*
* PARAMETERS: obj_desc - Object to be converted. Must be an
* Integer, Buffer, or String
* result_desc - Where the new Integer object is returned
* walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to an integer.
*
******************************************************************************/
acpi_status
acpi_ex_convert_to_integer (
union acpi_operand_object *obj_desc,
union acpi_operand_object **result_desc,
struct acpi_walk_state *walk_state)
{
u32 i;
union acpi_operand_object *ret_desc;
u32 count;
u8 *pointer;
acpi_integer result;
acpi_status status;
ACPI_FUNCTION_TRACE_PTR ("ex_convert_to_integer", obj_desc);
switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
case ACPI_TYPE_INTEGER:
*result_desc = obj_desc;
return_ACPI_STATUS (AE_OK);
case ACPI_TYPE_STRING:
pointer = (u8 *) obj_desc->string.pointer;
count = obj_desc->string.length;
break;
case ACPI_TYPE_BUFFER:
pointer = obj_desc->buffer.pointer;
count = obj_desc->buffer.length;
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
/*
* Convert the buffer/string to an integer. Note that both buffers and
* strings are treated as raw data - we don't convert ascii to hex for
* strings.
*
* There are two terminating conditions for the loop:
* 1) The size of an integer has been reached, or
* 2) The end of the buffer or string has been reached
*/
result = 0;
/* Transfer no more than an integer's worth of data */
if (count > acpi_gbl_integer_byte_width) {
count = acpi_gbl_integer_byte_width;
}
/*
* String conversion is different than Buffer conversion
*/
switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
case ACPI_TYPE_STRING:
/*
* Convert string to an integer
* String must be hexadecimal as per the ACPI specification
*/
status = acpi_ut_strtoul64 ((char *) pointer, 16, &result);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
break;
case ACPI_TYPE_BUFFER:
/*
* Buffer conversion - we simply grab enough raw data from the
* buffer to fill an integer
*/
for (i = 0; i < count; i++) {
/*
* Get next byte and shift it into the Result.
* Little endian is used, meaning that the first byte of the buffer
* is the LSB of the integer
*/
result |= (((acpi_integer) pointer[i]) << (i * 8));
}
break;
default:
/* No other types can get here */
break;
}
/*
* Create a new integer
*/
ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!ret_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Save the Result */
ret_desc->integer.value = result;
/*
* If we are about to overwrite the original object on the operand stack,
* we must remove a reference on the original object because we are
* essentially removing it from the stack.
*/
if (*result_desc == obj_desc) {
if (walk_state->opcode != AML_STORE_OP) {
acpi_ut_remove_reference (obj_desc);
}
}
*result_desc = ret_desc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_convert_to_buffer
*
* PARAMETERS: obj_desc - Object to be converted. Must be an
* Integer, Buffer, or String
* result_desc - Where the new buffer object is returned
* walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to a Buffer
*
******************************************************************************/
acpi_status
acpi_ex_convert_to_buffer (
union acpi_operand_object *obj_desc,
union acpi_operand_object **result_desc,
struct acpi_walk_state *walk_state)
{
union acpi_operand_object *ret_desc;
u32 i;
u8 *new_buf;
ACPI_FUNCTION_TRACE_PTR ("ex_convert_to_buffer", obj_desc);
switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
case ACPI_TYPE_BUFFER:
/* No conversion necessary */
*result_desc = obj_desc;
return_ACPI_STATUS (AE_OK);
case ACPI_TYPE_INTEGER:
/*
* Create a new Buffer object.
* Need enough space for one integer
*/
ret_desc = acpi_ut_create_buffer_object (acpi_gbl_integer_byte_width);
if (!ret_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Copy the integer to the buffer */
new_buf = ret_desc->buffer.pointer;
for (i = 0; i < acpi_gbl_integer_byte_width; i++) {
new_buf[i] = (u8) (obj_desc->integer.value >> (i * 8));
}
break;
case ACPI_TYPE_STRING:
/*
* Create a new Buffer object
* Size will be the string length
*/
ret_desc = acpi_ut_create_buffer_object ((acpi_size) obj_desc->string.length);
if (!ret_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Copy the string to the buffer */
new_buf = ret_desc->buffer.pointer;
ACPI_STRNCPY ((char *) new_buf, (char *) obj_desc->string.pointer,
obj_desc->string.length);
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
/* Mark buffer initialized */
ret_desc->common.flags |= AOPOBJ_DATA_VALID;
/*
* If we are about to overwrite the original object on the operand stack,
* we must remove a reference on the original object because we are
* essentially removing it from the stack.
*/
if (*result_desc == obj_desc) {
if (walk_state->opcode != AML_STORE_OP) {
acpi_ut_remove_reference (obj_desc);
}
}
*result_desc = ret_desc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_convert_ascii
*
* PARAMETERS: Integer - Value to be converted
* Base - 10 or 16
* String - Where the string is returned
* data_width - Size of data item to be converted
*
* RETURN: Actual string length
*
* DESCRIPTION: Convert an ACPI Integer to a hex or decimal string
*
******************************************************************************/
u32
acpi_ex_convert_to_ascii (
acpi_integer integer,
u32 base,
u8 *string,
u8 data_width)
{
u32 i;
u32 j;
u32 k = 0;
char hex_digit;
acpi_integer digit;
u32 remainder;
u32 length;
u8 leading_zero;
ACPI_FUNCTION_ENTRY ();
if (data_width < sizeof (acpi_integer)) {
leading_zero = FALSE;
length = data_width;
}
else {
leading_zero = TRUE;
length = sizeof (acpi_integer);
}
switch (base) {
case 10:
remainder = 0;
for (i = ACPI_MAX_DECIMAL_DIGITS; i > 0; i--) {
/* Divide by nth factor of 10 */
digit = integer;
for (j = 0; j < i; j++) {
(void) acpi_ut_short_divide (&digit, 10, &digit, &remainder);
}
/* Create the decimal digit */
if (remainder != 0) {
leading_zero = FALSE;
}
if (!leading_zero) {
string[k] = (u8) (ACPI_ASCII_ZERO + remainder);
k++;
}
}
break;
case 16:
/* Copy the integer to the buffer */
for (i = 0, j = ((length * 2) -1); i < (length * 2); i++, j--) {
hex_digit = acpi_ut_hex_to_ascii_char (integer, (j * 4));
if (hex_digit != ACPI_ASCII_ZERO) {
leading_zero = FALSE;
}
if (!leading_zero) {
string[k] = (u8) hex_digit;
k++;
}
}
break;
default:
break;
}
/*
* Since leading zeros are supressed, we must check for the case where
* the integer equals 0
*
* Finally, null terminate the string and return the length
*/
if (!k) {
string [0] = ACPI_ASCII_ZERO;
k = 1;
}
string [k] = 0;
return (k);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_convert_to_string
*
* PARAMETERS: obj_desc - Object to be converted. Must be an
* Integer, Buffer, or String
* result_desc - Where the string object is returned
* Base - 10 or 16
* max_length - Max length of the returned string
* walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to a string
*
******************************************************************************/
acpi_status
acpi_ex_convert_to_string (
union acpi_operand_object *obj_desc,
union acpi_operand_object **result_desc,
u32 base,
u32 max_length,
struct acpi_walk_state *walk_state)
{
union acpi_operand_object *ret_desc;
u8 *new_buf;
u8 *pointer;
u32 string_length;
u32 i;
ACPI_FUNCTION_TRACE_PTR ("ex_convert_to_string", obj_desc);
switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
case ACPI_TYPE_STRING:
if (max_length >= obj_desc->string.length) {
*result_desc = obj_desc;
return_ACPI_STATUS (AE_OK);
}
else {
/* Must copy the string first and then truncate it */
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
}
case ACPI_TYPE_INTEGER:
string_length = acpi_gbl_integer_byte_width * 2;
if (base == 10) {
string_length = ACPI_MAX_DECIMAL_DIGITS;
}
/*
* Create a new String
*/
ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
if (!ret_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Need enough space for one ASCII integer plus null terminator */
new_buf = ACPI_MEM_CALLOCATE ((acpi_size) string_length + 1);
if (!new_buf) {
ACPI_REPORT_ERROR
(("ex_convert_to_string: Buffer allocation failure\n"));
acpi_ut_remove_reference (ret_desc);
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Convert */
i = acpi_ex_convert_to_ascii (obj_desc->integer.value, base, new_buf, sizeof (acpi_integer));
/* Null terminate at the correct place */
if (max_length < i) {
new_buf[max_length] = 0;
ret_desc->string.length = max_length;
}
else {
new_buf [i] = 0;
ret_desc->string.length = i;
}
ret_desc->buffer.pointer = new_buf;
break;
case ACPI_TYPE_BUFFER:
/* Find the string length */
pointer = obj_desc->buffer.pointer;
for (string_length = 0; string_length < obj_desc->buffer.length; string_length++) {
/* Exit on null terminator */
if (!pointer[string_length]) {
break;
}
}
if (max_length > ACPI_MAX_STRING_CONVERSION) {
if (string_length > ACPI_MAX_STRING_CONVERSION) {
return_ACPI_STATUS (AE_AML_STRING_LIMIT);
}
}
/*
* Create a new string object
*/
ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
if (!ret_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* String length is the lesser of the Max or the actual length */
if (max_length < string_length) {
string_length = max_length;
}
new_buf = ACPI_MEM_CALLOCATE ((acpi_size) string_length + 1);
if (!new_buf) {
ACPI_REPORT_ERROR
(("ex_convert_to_string: Buffer allocation failure\n"));
acpi_ut_remove_reference (ret_desc);
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Copy the appropriate number of buffer characters */
ACPI_MEMCPY (new_buf, pointer, string_length);
/* Null terminate */
new_buf [string_length] = 0;
ret_desc->buffer.pointer = new_buf;
ret_desc->string.length = string_length;
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
/*
* If we are about to overwrite the original object on the operand stack,
* we must remove a reference on the original object because we are
* essentially removing it from the stack.
*/
if (*result_desc == obj_desc) {
if (walk_state->opcode != AML_STORE_OP) {
acpi_ut_remove_reference (obj_desc);
}
}
*result_desc = ret_desc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_convert_to_target_type
*
* PARAMETERS: destination_type - Current type of the destination
* source_desc - Source object to be converted.
* result_desc - Where the converted object is returned
* walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Implements "implicit conversion" rules for storing an object.
*
******************************************************************************/
acpi_status
acpi_ex_convert_to_target_type (
acpi_object_type destination_type,
union acpi_operand_object *source_desc,
union acpi_operand_object **result_desc,
struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE ("ex_convert_to_target_type");
/* Default behavior */
*result_desc = source_desc;
/*
* If required by the target,
* perform implicit conversion on the source before we store it.
*/
switch (GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args)) {
case ARGI_SIMPLE_TARGET:
case ARGI_FIXED_TARGET:
case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */
switch (destination_type) {
case ACPI_TYPE_LOCAL_REGION_FIELD:
/*
* Named field can always handle conversions
*/
break;
default:
/* No conversion allowed for these types */
if (destination_type != ACPI_GET_OBJECT_TYPE (source_desc)) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Explicit operator, will store (%s) over existing type (%s)\n",
acpi_ut_get_object_type_name (source_desc),
acpi_ut_get_type_name (destination_type)));
status = AE_TYPE;
}
}
break;
case ARGI_TARGETREF:
switch (destination_type) {
case ACPI_TYPE_INTEGER:
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
/*
* These types require an Integer operand. We can convert
* a Buffer or a String to an Integer if necessary.
*/
status = acpi_ex_convert_to_integer (source_desc, result_desc, walk_state);
break;
case ACPI_TYPE_STRING:
/*
* The operand must be a String. We can convert an
* Integer or Buffer if necessary
*/
status = acpi_ex_convert_to_string (source_desc, result_desc, 16, ACPI_UINT32_MAX, walk_state);
break;
case ACPI_TYPE_BUFFER:
/*
* The operand must be a Buffer. We can convert an
* Integer or String if necessary
*/
status = acpi_ex_convert_to_buffer (source_desc, result_desc, walk_state);
break;
default:
ACPI_REPORT_ERROR (("Bad destination type during conversion: %X\n",
destination_type));
status = AE_AML_INTERNAL;
break;
}
break;
case ARGI_REFERENCE:
/*
* create_xxxx_field cases - we are storing the field object into the name
*/
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unknown Target type ID 0x%X Op %s dest_type %s\n",
GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args),
walk_state->op_info->name, acpi_ut_get_type_name (destination_type)));
ACPI_REPORT_ERROR (("Bad Target Type (ARGI): %X\n",
GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args)))
status = AE_AML_INTERNAL;
}
/*
* Source-to-Target conversion semantics:
*
* If conversion to the target type cannot be performed, then simply
* overwrite the target with the new object and type.
*/
if (status == AE_TYPE) {
status = AE_OK;
}
return_ACPI_STATUS (status);
}
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