/******************************************************************************
*
* Module Name: exconvrt - Object conversion routines
* $Revision: 32 $
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2002, 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 "acnamesp.h"
#include "acinterp.h"
#include "acevents.h"
#include "amlcode.h"
#include "acdispat.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
* Walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to an integer.
*
******************************************************************************/
acpi_status
acpi_ex_convert_to_integer (
acpi_operand_object *obj_desc,
acpi_operand_object **result_desc,
acpi_walk_state *walk_state)
{
u32 i;
acpi_operand_object *ret_desc;
u32 count;
char *pointer;
acpi_integer result;
u32 integer_size = sizeof (acpi_integer);
ACPI_FUNCTION_TRACE_PTR ("Ex_convert_to_integer", obj_desc);
switch (obj_desc->common.type) {
case ACPI_TYPE_INTEGER:
*result_desc = obj_desc;
return_ACPI_STATUS (AE_OK);
case ACPI_TYPE_STRING:
pointer = obj_desc->string.pointer;
count = obj_desc->string.length;
break;
case ACPI_TYPE_BUFFER:
pointer = (char *) obj_desc->buffer.pointer;
count = obj_desc->buffer.length;
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
/*
* Create a new integer
*/
ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!ret_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Handle both ACPI 1.0 and ACPI 2.0 Integer widths */
if (walk_state->method_node->flags & ANOBJ_DATA_WIDTH_32) {
/*
* We are running a method that exists in a 32-bit ACPI table.
* Truncate the value to 32 bits by zeroing out the upper 32-bit field
*/
integer_size = sizeof (u32);
}
/*
* 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 > integer_size) {
count = integer_size;
}
/*
* String conversion is different than Buffer conversion
*/
switch (obj_desc->common.type) {
case ACPI_TYPE_STRING:
/* TBD: Need to use 64-bit ACPI_STRTOUL */
/*
* Convert string to an integer
* String must be hexadecimal as per the ACPI specification
*/
result = ACPI_STRTOUL (pointer, NULL, 16);
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;
}
/* Save the Result, delete original descriptor, store new descriptor */
ret_desc->integer.value = result;
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
* Walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to an Buffer
*
******************************************************************************/
acpi_status
acpi_ex_convert_to_buffer (
acpi_operand_object *obj_desc,
acpi_operand_object **result_desc,
acpi_walk_state *walk_state)
{
acpi_operand_object *ret_desc;
u32 i;
u32 integer_size = sizeof (acpi_integer);
u8 *new_buf;
ACPI_FUNCTION_TRACE_PTR ("Ex_convert_to_buffer", obj_desc);
switch (obj_desc->common.type) {
case ACPI_TYPE_INTEGER:
/*
* Create a new Buffer
*/
ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_BUFFER);
if (!ret_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Handle both ACPI 1.0 and ACPI 2.0 Integer widths */
if (walk_state->method_node->flags & ANOBJ_DATA_WIDTH_32) {
/*
* We are running a method that exists in a 32-bit ACPI table.
* Use only 32 bits of the Integer for conversion.
*/
integer_size = sizeof (u32);
}
/* Need enough space for one integer */
ret_desc->buffer.length = integer_size;
new_buf = ACPI_MEM_CALLOCATE (integer_size);
if (!new_buf) {
ACPI_REPORT_ERROR
(("Ex_convert_to_buffer: Buffer allocation failure\n"));
acpi_ut_remove_reference (ret_desc);
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Copy the integer to the buffer */
for (i = 0; i < integer_size; i++) {
new_buf[i] = (u8) (obj_desc->integer.value >> (i * 8));
}
ret_desc->buffer.pointer = new_buf;
/* Return the new buffer descriptor */
*result_desc = ret_desc;
break;
case ACPI_TYPE_STRING:
*result_desc = obj_desc;
break;
case ACPI_TYPE_BUFFER:
*result_desc = obj_desc;
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
/* Mark buffer initialized */
(*result_desc)->common.flags |= AOPOBJ_DATA_VALID;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ex_convert_ascii
*
* PARAMETERS: Integer
*
* RETURN: Actual string length
*
* DESCRIPTION: Convert an ACPI Integer to a hex string
*
******************************************************************************/
u32
acpi_ex_convert_to_ascii (
acpi_integer integer,
u32 base,
u8 *string)
{
u32 i;
u32 j;
u32 k = 0;
u8 hex_digit;
acpi_integer digit;
u32 remainder;
u32 length = sizeof (acpi_integer);
u8 leading_zero = TRUE;
ACPI_FUNCTION_ENTRY ();
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 = 1; j < i; j++) {
acpi_ut_short_divide (&digit, 10, &digit, &remainder);
}
/* Create the decimal digit */
if (digit != 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] = 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
* Walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to a string
*
******************************************************************************/
acpi_status
acpi_ex_convert_to_string (
acpi_operand_object *obj_desc,
acpi_operand_object **result_desc,
u32 base,
u32 max_length,
acpi_walk_state *walk_state)
{
acpi_operand_object *ret_desc;
u32 i;
u32 index;
u32 string_length;
u32 integer_size = sizeof (acpi_integer);
u8 *new_buf;
u8 *pointer;
ACPI_FUNCTION_TRACE_PTR ("Ex_convert_to_string", obj_desc);
switch (obj_desc->common.type) {
case ACPI_TYPE_INTEGER:
/* Handle both ACPI 1.0 and ACPI 2.0 Integer widths */
if (walk_state->method_node->flags & ANOBJ_DATA_WIDTH_32) {
/*
* We are running a method that exists in a 32-bit ACPI table.
* Use only 32 bits of the Integer
*/
integer_size = sizeof (u32);
}
string_length = integer_size * 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 (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);
/* 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;
/* Return the new buffer descriptor */
if (*result_desc == obj_desc) {
if (walk_state->opcode != AML_STORE_OP) {
acpi_ut_remove_reference (obj_desc);
}
}
*result_desc = ret_desc;
break;
case ACPI_TYPE_BUFFER:
string_length = obj_desc->buffer.length * 3;
if (base == 10) {
string_length = obj_desc->buffer.length * 4;
}
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 (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 each byte of the buffer to two ASCII characters plus a space.
*/
pointer = obj_desc->buffer.pointer;
index = 0;
for (i = 0, index = 0; i < obj_desc->buffer.length; i++) {
index = acpi_ex_convert_to_ascii (pointer[i], base, &new_buf[index]);
new_buf[index] = ' ';
index++;
}
/* Null terminate */
new_buf [index-1] = 0;
ret_desc->buffer.pointer = new_buf;
ret_desc->string.length = ACPI_STRLEN ((char *) new_buf);
/* Return the new buffer descriptor */
if (*result_desc == obj_desc) {
if (walk_state->opcode != AML_STORE_OP) {
acpi_ut_remove_reference (obj_desc);
}
}
*result_desc = ret_desc;
break;
case ACPI_TYPE_STRING:
if (max_length >= obj_desc->string.length) {
*result_desc = obj_desc;
}
else {
/* Must copy the string first and then truncate it */
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
}
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
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.
* 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,
acpi_operand_object *source_desc,
acpi_operand_object **result_desc,
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 INTERNAL_TYPE_REGION_FIELD:
/*
* Named field can always handle conversions
*/
break;
default:
/* No conversion allowed for these types */
if (destination_type != source_desc->common.type) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Target does not allow conversion of type %s to %s\n",
acpi_ut_get_type_name ((source_desc)->common.type),
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 INTERNAL_TYPE_BANK_FIELD:
case INTERNAL_TYPE_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;
}
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)));
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);
}