447 lines
12 KiB
C
447 lines
12 KiB
C
/******************************************************************************
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*
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* Module Name: nsconvert - Object conversions for objects returned by
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* predefined methods
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#include "acinterp.h"
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#include "acpredef.h"
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#include "amlresrc.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsconvert")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_convert_to_integer
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*
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* PARAMETERS: original_object - Object to be converted
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* return_object - Where the new converted object is returned
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*
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* RETURN: Status. AE_OK if conversion was successful.
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*
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* DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
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union acpi_operand_object **return_object)
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{
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union acpi_operand_object *new_object;
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acpi_status status;
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u64 value = 0;
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u32 i;
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switch (original_object->common.type) {
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case ACPI_TYPE_STRING:
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/* String-to-Integer conversion */
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status = acpi_ut_strtoul64(original_object->string.pointer,
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ACPI_ANY_BASE, &value);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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break;
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case ACPI_TYPE_BUFFER:
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/* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
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if (original_object->buffer.length > 8) {
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return (AE_AML_OPERAND_TYPE);
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}
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/* Extract each buffer byte to create the integer */
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for (i = 0; i < original_object->buffer.length; i++) {
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value |=
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((u64)original_object->buffer.
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pointer[i] << (i * 8));
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}
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break;
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default:
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return (AE_AML_OPERAND_TYPE);
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}
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new_object = acpi_ut_create_integer_object(value);
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if (!new_object) {
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return (AE_NO_MEMORY);
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}
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*return_object = new_object;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_convert_to_string
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*
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* PARAMETERS: original_object - Object to be converted
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* return_object - Where the new converted object is returned
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*
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* RETURN: Status. AE_OK if conversion was successful.
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*
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* DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_convert_to_string(union acpi_operand_object *original_object,
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union acpi_operand_object **return_object)
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{
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union acpi_operand_object *new_object;
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acpi_size length;
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acpi_status status;
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switch (original_object->common.type) {
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case ACPI_TYPE_INTEGER:
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/*
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* Integer-to-String conversion. Commonly, convert
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* an integer of value 0 to a NULL string. The last element of
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* _BIF and _BIX packages occasionally need this fix.
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*/
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if (original_object->integer.value == 0) {
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/* Allocate a new NULL string object */
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new_object = acpi_ut_create_string_object(0);
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if (!new_object) {
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return (AE_NO_MEMORY);
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}
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} else {
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status =
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acpi_ex_convert_to_string(original_object,
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&new_object,
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ACPI_IMPLICIT_CONVERT_HEX);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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}
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break;
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case ACPI_TYPE_BUFFER:
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/*
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* Buffer-to-String conversion. Use a to_string
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* conversion, no transform performed on the buffer data. The best
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* example of this is the _BIF method, where the string data from
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* the battery is often (incorrectly) returned as buffer object(s).
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*/
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length = 0;
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while ((length < original_object->buffer.length) &&
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(original_object->buffer.pointer[length])) {
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length++;
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}
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/* Allocate a new string object */
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new_object = acpi_ut_create_string_object(length);
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if (!new_object) {
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return (AE_NO_MEMORY);
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}
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/*
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* Copy the raw buffer data with no transform. String is already NULL
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* terminated at Length+1.
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*/
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ACPI_MEMCPY(new_object->string.pointer,
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original_object->buffer.pointer, length);
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break;
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default:
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return (AE_AML_OPERAND_TYPE);
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}
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*return_object = new_object;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_convert_to_buffer
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*
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* PARAMETERS: original_object - Object to be converted
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* return_object - Where the new converted object is returned
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*
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* RETURN: Status. AE_OK if conversion was successful.
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*
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* DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
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union acpi_operand_object **return_object)
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{
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union acpi_operand_object *new_object;
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acpi_status status;
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union acpi_operand_object **elements;
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u32 *dword_buffer;
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u32 count;
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u32 i;
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switch (original_object->common.type) {
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case ACPI_TYPE_INTEGER:
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/*
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* Integer-to-Buffer conversion.
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* Convert the Integer to a packed-byte buffer. _MAT and other
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* objects need this sometimes, if a read has been performed on a
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* Field object that is less than or equal to the global integer
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* size (32 or 64 bits).
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*/
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status =
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acpi_ex_convert_to_buffer(original_object, &new_object);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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break;
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case ACPI_TYPE_STRING:
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/* String-to-Buffer conversion. Simple data copy */
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new_object =
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acpi_ut_create_buffer_object(original_object->string.
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length);
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if (!new_object) {
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return (AE_NO_MEMORY);
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}
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ACPI_MEMCPY(new_object->buffer.pointer,
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original_object->string.pointer,
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original_object->string.length);
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break;
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case ACPI_TYPE_PACKAGE:
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/*
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* This case is often seen for predefined names that must return a
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* Buffer object with multiple DWORD integers within. For example,
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* _FDE and _GTM. The Package can be converted to a Buffer.
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*/
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/* All elements of the Package must be integers */
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elements = original_object->package.elements;
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count = original_object->package.count;
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for (i = 0; i < count; i++) {
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if ((!*elements) ||
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((*elements)->common.type != ACPI_TYPE_INTEGER)) {
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return (AE_AML_OPERAND_TYPE);
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}
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elements++;
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}
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/* Create the new buffer object to replace the Package */
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new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
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if (!new_object) {
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return (AE_NO_MEMORY);
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}
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/* Copy the package elements (integers) to the buffer as DWORDs */
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elements = original_object->package.elements;
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dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
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for (i = 0; i < count; i++) {
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*dword_buffer = (u32)(*elements)->integer.value;
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dword_buffer++;
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elements++;
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}
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break;
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default:
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return (AE_AML_OPERAND_TYPE);
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}
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*return_object = new_object;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_convert_to_unicode
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*
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* PARAMETERS: original_object - ASCII String Object to be converted
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* return_object - Where the new converted object is returned
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*
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* RETURN: Status. AE_OK if conversion was successful.
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*
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* DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
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union acpi_operand_object **return_object)
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{
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union acpi_operand_object *new_object;
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char *ascii_string;
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u16 *unicode_buffer;
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u32 unicode_length;
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u32 i;
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if (!original_object) {
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return (AE_OK);
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}
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/* If a Buffer was returned, it must be at least two bytes long */
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if (original_object->common.type == ACPI_TYPE_BUFFER) {
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if (original_object->buffer.length < 2) {
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return (AE_AML_OPERAND_VALUE);
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}
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*return_object = NULL;
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return (AE_OK);
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}
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/*
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* The original object is an ASCII string. Convert this string to
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* a unicode buffer.
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*/
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ascii_string = original_object->string.pointer;
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unicode_length = (original_object->string.length * 2) + 2;
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/* Create a new buffer object for the Unicode data */
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new_object = acpi_ut_create_buffer_object(unicode_length);
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if (!new_object) {
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return (AE_NO_MEMORY);
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}
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unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
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/* Convert ASCII to Unicode */
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for (i = 0; i < original_object->string.length; i++) {
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unicode_buffer[i] = (u16)ascii_string[i];
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}
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*return_object = new_object;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_convert_to_resource
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*
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* PARAMETERS: original_object - Object to be converted
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* return_object - Where the new converted object is returned
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*
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* RETURN: Status. AE_OK if conversion was successful
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*
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* DESCRIPTION: Attempt to convert a Integer object to a resource_template
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* Buffer.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
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union acpi_operand_object **return_object)
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{
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union acpi_operand_object *new_object;
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u8 *buffer;
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/*
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* We can fix the following cases for an expected resource template:
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* 1. No return value (interpreter slack mode is disabled)
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* 2. A "Return (Zero)" statement
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* 3. A "Return empty buffer" statement
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*
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* We will return a buffer containing a single end_tag
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* resource descriptor.
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*/
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if (original_object) {
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switch (original_object->common.type) {
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case ACPI_TYPE_INTEGER:
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/* We can only repair an Integer==0 */
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if (original_object->integer.value) {
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return (AE_AML_OPERAND_TYPE);
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}
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break;
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case ACPI_TYPE_BUFFER:
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if (original_object->buffer.length) {
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/* Additional checks can be added in the future */
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*return_object = NULL;
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return (AE_OK);
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}
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break;
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case ACPI_TYPE_STRING:
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default:
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return (AE_AML_OPERAND_TYPE);
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}
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}
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/* Create the new buffer object for the resource descriptor */
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new_object = acpi_ut_create_buffer_object(2);
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if (!new_object) {
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return (AE_NO_MEMORY);
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}
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buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
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/* Initialize the Buffer with a single end_tag descriptor */
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buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
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buffer[1] = 0x00;
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*return_object = new_object;
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return (AE_OK);
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}
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