exconvrt.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:15k
- /******************************************************************************
- *
- * Module Name: exconvrt - Object conversion routines
- * $Revision: 24 $
- *
- *****************************************************************************/
- /*
- * 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 "acparser.h"
- #include "acnamesp.h"
- #include "acinterp.h"
- #include "acevents.h"
- #include "amlcode.h"
- #include "acdispat.h"
- #define _COMPONENT ACPI_EXECUTER
- 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);
- FUNCTION_ENTRY ();
- switch (obj_desc->common.type) {
- case ACPI_TYPE_INTEGER:
- *result_desc = obj_desc;
- return (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 (AE_TYPE);
- }
- /*
- * Create a new integer
- */
- ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
- if (!ret_desc) {
- return (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 STRTOUL */
- /*
- * Convert string to an integer
- * String must be hexadecimal as per the ACPI specification
- */
- result = 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 (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;
- FUNCTION_ENTRY ();
- 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 (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);
- }
- /* Need enough space for one integers */
- ret_desc->buffer.length = integer_size;
- new_buf = ACPI_MEM_CALLOCATE (integer_size);
- if (!new_buf) {
- REPORT_ERROR
- (("Ex_convert_to_buffer: Buffer allocation failuren"));
- acpi_ut_remove_reference (ret_desc);
- return (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 */
- 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:
- *result_desc = obj_desc;
- break;
- case ACPI_TYPE_BUFFER:
- *result_desc = obj_desc;
- break;
- default:
- return (AE_TYPE);
- break;
- }
- return (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;
- 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) (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 != 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] = 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;
- FUNCTION_ENTRY ();
- 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.
- * Truncate the value to 32 bits by zeroing out the upper
- * 32-bit field
- */
- 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 (AE_NO_MEMORY);
- }
- /* Need enough space for one ASCII integer plus null terminator */
- new_buf = ACPI_MEM_CALLOCATE (string_length + 1);
- if (!new_buf) {
- REPORT_ERROR
- (("Ex_convert_to_string: Buffer allocation failuren"));
- acpi_ut_remove_reference (ret_desc);
- return (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 (AE_AML_STRING_LIMIT);
- }
- }
- /*
- * Create a new string object
- */
- ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
- if (!ret_desc) {
- return (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) {
- REPORT_ERROR
- (("Ex_convert_to_string: Buffer allocation failuren"));
- acpi_ut_remove_reference (ret_desc);
- return (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 = 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 (AE_NOT_IMPLEMENTED);
- }
- break;
- default:
- return (AE_TYPE);
- break;
- }
- return (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ex_convert_to_target_type
- *
- * PARAMETERS: *Obj_desc - Object to be converted.
- * Walk_state - Current method state
- *
- * RETURN: Status
- *
- * DESCRIPTION:
- *
- ******************************************************************************/
- acpi_status
- acpi_ex_convert_to_target_type (
- acpi_object_type8 destination_type,
- acpi_operand_object **obj_desc,
- acpi_walk_state *walk_state)
- {
- acpi_status status = AE_OK;
- FUNCTION_TRACE ("Ex_convert_to_target_type");
- /*
- * 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 != (*obj_desc)->common.type) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Target does not allow conversion of type %s to %sn",
- acpi_ut_get_type_name ((*obj_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 (*obj_desc, obj_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 (*obj_desc, obj_desc, 16, ACPI_UINT32_MAX, walk_state);
- break;
- case ACPI_TYPE_BUFFER:
- /*
- * The operand must be a String. We can convert an
- * Integer or Buffer if necessary
- */
- status = acpi_ex_convert_to_buffer (*obj_desc, obj_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 %sn",
- 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);
- }