exmisc.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, 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("exmisc")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_get_object_reference
 *
 * PARAMETERS:  obj_desc            - Create a reference to this object
 *              return_desc         - Where to store the reference
 *              walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Obtain and return a "reference" to the target object
 *              Common code for the ref_of_op and the cond_ref_of_op.
 *
 ******************************************************************************/
acpi_status
acpi_ex_get_object_reference(union acpi_operand_object *obj_desc,
			     union acpi_operand_object **return_desc,
			     struct acpi_walk_state *walk_state)
{
	union acpi_operand_object *reference_obj;
	union acpi_operand_object *referenced_obj;

	ACPI_FUNCTION_TRACE_PTR("ex_get_object_reference", obj_desc);

	*return_desc = NULL;

	switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
	case ACPI_DESC_TYPE_OPERAND:

		if (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) {
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/*
		 * Must be a reference to a Local or Arg
		 */
		switch (obj_desc->reference.opcode) {
		case AML_LOCAL_OP:
		case AML_ARG_OP:
		case AML_DEBUG_OP:

			/* The referenced object is the pseudo-node for the local/arg */

			referenced_obj = obj_desc->reference.object;
			break;

		default:

			ACPI_REPORT_ERROR(("Unknown Reference opcode in get_reference %X\n", obj_desc->reference.opcode));
			return_ACPI_STATUS(AE_AML_INTERNAL);
		}
		break;

	case ACPI_DESC_TYPE_NAMED:

		/*
		 * A named reference that has already been resolved to a Node
		 */
		referenced_obj = obj_desc;
		break;

	default:

		ACPI_REPORT_ERROR(("Invalid descriptor type in get_reference: %X\n", ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
		return_ACPI_STATUS(AE_TYPE);
	}

	/* Create a new reference object */

	reference_obj =
	    acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
	if (!reference_obj) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	reference_obj->reference.opcode = AML_REF_OF_OP;
	reference_obj->reference.object = referenced_obj;
	*return_desc = reference_obj;

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Object %p Type [%s], returning Reference %p\n",
			  obj_desc, acpi_ut_get_object_type_name(obj_desc),
			  *return_desc));

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_concat_template
 *
 * PARAMETERS:  Operand0            - First source object
 *              Operand1            - Second source object
 *              actual_return_desc  - Where to place the return object
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Concatenate two resource templates
 *
 ******************************************************************************/

acpi_status
acpi_ex_concat_template(union acpi_operand_object *operand0,
			union acpi_operand_object *operand1,
			union acpi_operand_object **actual_return_desc,
			struct acpi_walk_state *walk_state)
{
	union acpi_operand_object *return_desc;
	u8 *new_buf;
	u8 *end_tag1;
	u8 *end_tag2;
	acpi_size length1;
	acpi_size length2;

	ACPI_FUNCTION_TRACE("ex_concat_template");

	/* Find the end_tags in each resource template */

	end_tag1 = acpi_ut_get_resource_end_tag(operand0);
	end_tag2 = acpi_ut_get_resource_end_tag(operand1);
	if (!end_tag1 || !end_tag2) {
		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	/* Compute the length of each part */

	length1 = ACPI_PTR_DIFF(end_tag1, operand0->buffer.pointer);
	length2 = ACPI_PTR_DIFF(end_tag2, operand1->buffer.pointer) + 2;	/* Size of END_TAG */

	/* Create a new buffer object for the result */

	return_desc = acpi_ut_create_buffer_object(length1 + length2);
	if (!return_desc) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Copy the templates to the new descriptor */

	new_buf = return_desc->buffer.pointer;
	ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length1);
	ACPI_MEMCPY(new_buf + length1, operand1->buffer.pointer, length2);

	/* Compute the new checksum */

	new_buf[return_desc->buffer.length - 1] =
	    acpi_ut_generate_checksum(return_desc->buffer.pointer,
				      (return_desc->buffer.length - 1));

	/* Return the completed template descriptor */

	*actual_return_desc = return_desc;
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_do_concatenate
 *
 * PARAMETERS:  Operand0            - First source object
 *              Operand1            - Second source object
 *              actual_return_desc  - Where to place the return object
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
 *
 ******************************************************************************/

acpi_status
acpi_ex_do_concatenate(union acpi_operand_object *operand0,
		       union acpi_operand_object *operand1,
		       union acpi_operand_object **actual_return_desc,
		       struct acpi_walk_state *walk_state)
{
	union acpi_operand_object *local_operand1 = operand1;
	union acpi_operand_object *return_desc;
	char *new_buf;
	acpi_status status;
	acpi_size new_length;

	ACPI_FUNCTION_TRACE("ex_do_concatenate");

	/*
	 * Convert the second operand if necessary.  The first operand
	 * determines the type of the second operand, (See the Data Types
	 * section of the ACPI specification.)  Both object types are
	 * guaranteed to be either Integer/String/Buffer by the operand
	 * resolution mechanism.
	 */
	switch (ACPI_GET_OBJECT_TYPE(operand0)) {
	case ACPI_TYPE_INTEGER:
		status =
		    acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
		break;

	case ACPI_TYPE_STRING:
		status = acpi_ex_convert_to_string(operand1, &local_operand1,
						   ACPI_IMPLICIT_CONVERT_HEX);
		break;

	case ACPI_TYPE_BUFFER:
		status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
		break;

	default:
		ACPI_REPORT_ERROR(("Concat - invalid obj type: %X\n",
				   ACPI_GET_OBJECT_TYPE(operand0)));
		status = AE_AML_INTERNAL;
	}

	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/*
	 * Both operands are now known to be the same object type
	 * (Both are Integer, String, or Buffer), and we can now perform the
	 * concatenation.
	 */

	/*
	 * There are three cases to handle:
	 *
	 * 1) Two Integers concatenated to produce a new Buffer
	 * 2) Two Strings concatenated to produce a new String
	 * 3) Two Buffers concatenated to produce a new Buffer
	 */
	switch (ACPI_GET_OBJECT_TYPE(operand0)) {
	case ACPI_TYPE_INTEGER:

		/* Result of two Integers is a Buffer */
		/* Need enough buffer space for two integers */

		return_desc = acpi_ut_create_buffer_object((acpi_size)
							   ACPI_MUL_2
							   (acpi_gbl_integer_byte_width));
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		new_buf = (char *)return_desc->buffer.pointer;

		/* Copy the first integer, LSB first */

		ACPI_MEMCPY(new_buf,
			    &operand0->integer.value,
			    acpi_gbl_integer_byte_width);

		/* Copy the second integer (LSB first) after the first */

		ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width,
			    &local_operand1->integer.value,
			    acpi_gbl_integer_byte_width);
		break;

	case ACPI_TYPE_STRING:

		/* Result of two Strings is a String */

		new_length = (acpi_size) operand0->string.length +
		    (acpi_size) local_operand1->string.length;
		if (new_length > ACPI_MAX_STRING_CONVERSION) {
			status = AE_AML_STRING_LIMIT;
			goto cleanup;
		}

		return_desc = acpi_ut_create_string_object(new_length);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		new_buf = return_desc->string.pointer;

		/* Concatenate the strings */

		ACPI_STRCPY(new_buf, operand0->string.pointer);
		ACPI_STRCPY(new_buf + operand0->string.length,
			    local_operand1->string.pointer);
		break;

	case ACPI_TYPE_BUFFER:

		/* Result of two Buffers is a Buffer */

		return_desc = acpi_ut_create_buffer_object((acpi_size)
							   operand0->buffer.
							   length +
							   (acpi_size)
							   local_operand1->
							   buffer.length);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}