Subversion Repositories Kolibri OS

/******************************************************************************

 *

 * Module Name: nsconvert - Object conversions for objects returned by

 *                          predefined methods

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2015, Intel Corp.

 * 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 

#include "accommon.h"

#include "acnamesp.h"

#include "acinterp.h"

#include "acpredef.h"

#include "amlresrc.h"

#define _COMPONENT          ACPI_NAMESPACE

ACPI_MODULE_NAME("nsconvert")

/*******************************************************************************

 *

 * FUNCTION:    acpi_ns_convert_to_integer

 *

 * PARAMETERS:  original_object     - Object to be converted

 *              return_object       - Where the new converted object is returned

 *

 * RETURN:      Status. AE_OK if conversion was successful.

 *

 * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.

 *

 ******************************************************************************/

acpi_status

acpi_ns_convert_to_integer(union acpi_operand_object *original_object,

			   union acpi_operand_object **return_object)

{

	union acpi_operand_object *new_object;

	acpi_status status;

	u64 value = 0;

	u32 i;

	switch (original_object->common.type) {

	case ACPI_TYPE_STRING:

		/* String-to-Integer conversion */

		status = acpi_ut_strtoul64(original_object->string.pointer,

					   ACPI_ANY_BASE, &value);

		if (ACPI_FAILURE(status)) {

			return (status);

		}

		break;

	case ACPI_TYPE_BUFFER:

		/* Buffer-to-Integer conversion. Max buffer size is 64 bits. */

		if (original_object->buffer.length > 8) {

			return (AE_AML_OPERAND_TYPE);

		}

		/* Extract each buffer byte to create the integer */

		for (i = 0; i < original_object->buffer.length; i++) {

			value |=

			    ((u64)original_object->buffer.

			     pointer[i] << (i * 8));

		}

		break;

	default:

		return (AE_AML_OPERAND_TYPE);

	}

	new_object = acpi_ut_create_integer_object(value);

	if (!new_object) {

		return (AE_NO_MEMORY);

	}

	*return_object = new_object;

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ns_convert_to_string

 *

 * PARAMETERS:  original_object     - Object to be converted

 *              return_object       - Where the new converted object is returned

 *

 * RETURN:      Status. AE_OK if conversion was successful.

 *

 * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.

 *

 ******************************************************************************/

acpi_status

acpi_ns_convert_to_string(union acpi_operand_object *original_object,

			  union acpi_operand_object **return_object)

{

	union acpi_operand_object *new_object;

	acpi_size length;

	acpi_status status;

	switch (original_object->common.type) {

	case ACPI_TYPE_INTEGER:

		/*

		 * Integer-to-String conversion. Commonly, convert

		 * an integer of value 0 to a NULL string. The last element of

		 * _BIF and _BIX packages occasionally need this fix.

		 */

		if (original_object->integer.value == 0) {

			/* Allocate a new NULL string object */

			new_object = acpi_ut_create_string_object(0);

			if (!new_object) {

				return (AE_NO_MEMORY);

			}

		} else {

			status =

			    acpi_ex_convert_to_string(original_object,

						      &new_object,

						      ACPI_IMPLICIT_CONVERT_HEX);

			if (ACPI_FAILURE(status)) {

				return (status);

			}

		}

		break;

	case ACPI_TYPE_BUFFER:

		/*

		 * Buffer-to-String conversion. Use a to_string

		 * conversion, no transform performed on the buffer data. The best

		 * example of this is the _BIF method, where the string data from

		 * the battery is often (incorrectly) returned as buffer object(s).

		 */

		length = 0;

		while ((length < original_object->buffer.length) &&

		       (original_object->buffer.pointer[length])) {

			length++;

		}

		/* Allocate a new string object */

		new_object = acpi_ut_create_string_object(length);

		if (!new_object) {

			return (AE_NO_MEMORY);

		}

		/*

		 * Copy the raw buffer data with no transform. String is already NULL

		 * terminated at Length+1.

		 */

		memcpy(new_object->string.pointer,

		       original_object->buffer.pointer, length);

		break;

	default:

		return (AE_AML_OPERAND_TYPE);

	}

	*return_object = new_object;

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ns_convert_to_buffer

 *

 * PARAMETERS:  original_object     - Object to be converted

 *              return_object       - Where the new converted object is returned

 *

 * RETURN:      Status. AE_OK if conversion was successful.

 *

 * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.

 *

 ******************************************************************************/

acpi_status

acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,

			  union acpi_operand_object **return_object)

{

	union acpi_operand_object *new_object;

	acpi_status status;

	union acpi_operand_object **elements;

	u32 *dword_buffer;

	u32 count;

	u32 i;

	switch (original_object->common.type) {

	case ACPI_TYPE_INTEGER:

		/*

		 * Integer-to-Buffer conversion.

		 * Convert the Integer to a packed-byte buffer. _MAT and other

		 * objects need this sometimes, if a read has been performed on a

		 * Field object that is less than or equal to the global integer

		 * size (32 or 64 bits).

		 */

		status =

		    acpi_ex_convert_to_buffer(original_object, &new_object);

		if (ACPI_FAILURE(status)) {

			return (status);

		}

		break;

	case ACPI_TYPE_STRING:

		/* String-to-Buffer conversion. Simple data copy */

		new_object =

		    acpi_ut_create_buffer_object(original_object->string.

						 length);

		if (!new_object) {

			return (AE_NO_MEMORY);

		}

		memcpy(new_object->buffer.pointer,

		       original_object->string.pointer,

		       original_object->string.length);

		break;

	case ACPI_TYPE_PACKAGE:

		/*

		 * This case is often seen for predefined names that must return a

		 * Buffer object with multiple DWORD integers within. For example,

		 * _FDE and _GTM. The Package can be converted to a Buffer.

		 */

		/* All elements of the Package must be integers */

		elements = original_object->package.elements;

		count = original_object->package.count;

		for (i = 0; i < count; i++) {

			if ((!*elements) ||

			    ((*elements)->common.type != ACPI_TYPE_INTEGER)) {

				return (AE_AML_OPERAND_TYPE);

			}

			elements++;

		}

		/* Create the new buffer object to replace the Package */

		new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));

		if (!new_object) {

			return (AE_NO_MEMORY);

		}

		/* Copy the package elements (integers) to the buffer as DWORDs */

		elements = original_object->package.elements;

		dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);

		for (i = 0; i < count; i++) {

			*dword_buffer = (u32)(*elements)->integer.value;

			dword_buffer++;

			elements++;

		}

		break;

	default:

		return (AE_AML_OPERAND_TYPE);

	}

	*return_object = new_object;

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ns_convert_to_unicode

 *

 * PARAMETERS:  original_object     - ASCII String Object to be converted

 *              return_object       - Where the new converted object is returned

 *

 * RETURN:      Status. AE_OK if conversion was successful.

 *

 * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.

 *

 ******************************************************************************/

acpi_status

acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,

			   union acpi_operand_object **return_object)

{

	union acpi_operand_object *new_object;

	char *ascii_string;

	u16 *unicode_buffer;

	u32 unicode_length;

	u32 i;

	if (!original_object) {

		return (AE_OK);

	}

	/* If a Buffer was returned, it must be at least two bytes long */

	if (original_object->common.type == ACPI_TYPE_BUFFER) {

		if (original_object->buffer.length < 2) {

			return (AE_AML_OPERAND_VALUE);

		}

		*return_object = NULL;

		return (AE_OK);

	}

	/*

	 * The original object is an ASCII string. Convert this string to

	 * a unicode buffer.

	 */

	ascii_string = original_object->string.pointer;

	unicode_length = (original_object->string.length * 2) + 2;

	/* Create a new buffer object for the Unicode data */

	new_object = acpi_ut_create_buffer_object(unicode_length);

	if (!new_object) {

		return (AE_NO_MEMORY);

	}

	unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);

	/* Convert ASCII to Unicode */

	for (i = 0; i < original_object->string.length; i++) {

		unicode_buffer[i] = (u16)ascii_string[i];

	}

	*return_object = new_object;

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ns_convert_to_resource

 *

 * PARAMETERS:  original_object     - Object to be converted

 *              return_object       - Where the new converted object is returned

 *

 * RETURN:      Status. AE_OK if conversion was successful

 *

 * DESCRIPTION: Attempt to convert a Integer object to a resource_template

 *              Buffer.

 *

 ******************************************************************************/

acpi_status

acpi_ns_convert_to_resource(union acpi_operand_object *original_object,

			    union acpi_operand_object **return_object)

{

	union acpi_operand_object *new_object;

	u8 *buffer;

	/*

	 * We can fix the following cases for an expected resource template:

	 * 1. No return value (interpreter slack mode is disabled)

	 * 2. A "Return (Zero)" statement

	 * 3. A "Return empty buffer" statement

	 *

	 * We will return a buffer containing a single end_tag

	 * resource descriptor.

	 */

	if (original_object) {

		switch (original_object->common.type) {

		case ACPI_TYPE_INTEGER:

			/* We can only repair an Integer==0 */

			if (original_object->integer.value) {

				return (AE_AML_OPERAND_TYPE);

			}

			break;

		case ACPI_TYPE_BUFFER:

			if (original_object->buffer.length) {

				/* Additional checks can be added in the future */

				*return_object = NULL;

				return (AE_OK);

			}

			break;

		case ACPI_TYPE_STRING:

		default:

			return (AE_AML_OPERAND_TYPE);

		}

	}

	/* Create the new buffer object for the resource descriptor */

	new_object = acpi_ut_create_buffer_object(2);

	if (!new_object) {

		return (AE_NO_MEMORY);

	}

	buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);

	/* Initialize the Buffer with a single end_tag descriptor */

	buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);

	buffer[1] = 0x00;

	*return_object = new_object;

	return (AE_OK);

}