/****************************************************************************** * * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes * *****************************************************************************/ /* * Copyright (C) 2000 - 2007, 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>#include <acpi/amlresrc.h> #define _COMPONENT          ACPI_EXECUTERACPI_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_statusacpi_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_ERROR((AE_INFO, "Unknown Reference opcode %X",				    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_ERROR((AE_INFO, "Invalid descriptor type %X",			    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_statusacpi_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){	acpi_status status;	union acpi_operand_object *return_desc;	u8 *new_buf;	u8 *end_tag;	acpi_size length0;	acpi_size length1;	acpi_size new_length; 	ACPI_FUNCTION_TRACE(ex_concat_template); 	/*	 * Find the end_tag descriptor in each resource template.	 * Note1: returned pointers point TO the end_tag, not past it.	 * Note2: zero-length buffers are allowed; treated like one end_tag	 */ 	/* Get the length of the first resource template */ 	status = acpi_ut_get_resource_end_tag(operand0, &end_tag);	if (ACPI_FAILURE(status)) {		return_ACPI_STATUS(status);	} 	length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer); 	/* Get the length of the second resource template */ 	status = acpi_ut_get_resource_end_tag(operand1, &end_tag);	if (ACPI_FAILURE(status)) {		return_ACPI_STATUS(status);	} 	length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer); 	/* Combine both lengths, minimum size will be 2 for end_tag */ 	new_length = length0 + length1 + sizeof(struct aml_resource_end_tag); 	/* Create a new buffer object for the result (with one end_tag) */ 	return_desc = acpi_ut_create_buffer_object(new_length);	if (!return_desc) {		return_ACPI_STATUS(AE_NO_MEMORY);	} 	/*	 * Copy the templates to the new buffer, 0 first, then 1 follows. One	 * end_tag descriptor is copied from Operand1.	 */	new_buf = return_desc->buffer.pointer;	ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0);	ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1); 	/* Insert end_tag and set the checksum to zero, means "ignore checksum" */ 	new_buf[new_length - 1] = 0;	new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; 	/* Return the completed resource template */ 	*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_statusacpi_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_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_ERROR((AE_INFO, "Invalid object type: %X",			    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 */ 		return_desc = acpi_ut_create_string_object((acpi_size)							   (operand0->string.							    length +							    local_operand1->							    string.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 +							    local_operand1->							    buffer.length));		if (!return_desc) {			status = AE_NO_MEMORY;			goto cleanup;		} 		new_buf = (char *)return_desc->buffer.pointer; 		/* Concatenate the buffers */ 		ACPI_MEMCPY(new_buf, operand0->buffer.pointer,			    operand0->buffer.length);		ACPI_MEMCPY(new_buf + operand0->buffer.length,			    local_operand1->buffer.pointer,			    local_operand1->buffer.length);		break; 	default: 		/* Invalid object type, should not happen here */ 		ACPI_ERROR((AE_INFO, "Invalid object type: %X",			    ACPI_GET_OBJECT_TYPE(operand0)));		status = AE_AML_INTERNAL;		goto cleanup;	} 	*actual_return_desc = return_desc;       cleanup:	if (local_operand1 != operand1) {		acpi_ut_remove_reference(local_operand1);	}	return_ACPI_STATUS(status);} /******************************************************************************* * * FUNCTION:    acpi_ex_do_math_op * * PARAMETERS:  Opcode              - AML opcode *              Integer0            - Integer operand #0 *              Integer1            - Integer operand #1 * * RETURN:      Integer result of the operation * * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the *              math functions here is to prevent a lot of pointer dereferencing *              to obtain the operands. * ******************************************************************************/ acpi_integeracpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer integer1){ 	ACPI_FUNCTION_ENTRY(); 	switch (opcode) {	case AML_ADD_OP:	/* Add (Integer0, Integer1, Result) */ 		return (integer0 + integer1); 	case AML_BIT_AND_OP:	/* And (Integer0, Integer1, Result) */ 		return (integer0 & integer1); 	case AML_BIT_NAND_OP:	/* NAnd (Integer0, Integer1, Result) */ 		return (~(integer0 & integer1)); 	case AML_BIT_OR_OP:	/* Or (Integer0, Integer1, Result) */ 		return (integer0 | integer1); 	case AML_BIT_NOR_OP:	/* NOr (Integer0, Integer1, Result) */ 		return (~(integer0 | integer1)); 	case AML_BIT_XOR_OP:	/* XOr (Integer0, Integer1, Result) */ 		return (integer0 ^ integer1); 	case AML_MULTIPLY_OP:	/* Multiply (Integer0, Integer1, Result) */ 		return (integer0 * integer1); 	case AML_SHIFT_LEFT_OP:	/* shift_left (Operand, shift_count, Result) */ 		/*		 * We need to check if the shiftcount is larger than the integer bit		 * width since the behavior of this is not well-defined in the C language.		 */		if (integer1 >= acpi_gbl_integer_bit_width) {			return (0);		}		return (integer0 << integer1); 	case AML_SHIFT_RIGHT_OP:	/* shift_right (Operand, shift_count, Result) */ 		/*		 * We need to check if the shiftcount is larger than the integer bit		 * width since the behavior of this is not well-defined in the C language.		 */		if (integer1 >= acpi_gbl_integer_bit_width) {			return (0);		}		return (integer0 >> integer1); 	case AML_SUBTRACT_OP:	/* Subtract (Integer0, Integer1, Result) */ 		return (integer0 - integer1); 	default: 		return (0);	}} /******************************************************************************* * * FUNCTION:    acpi_ex_do_logical_numeric_op * * PARAMETERS:  Opcode              - AML opcode *              Integer0            - Integer operand #0 *              Integer1            - Integer operand #1 *              logical_result      - TRUE/FALSE result of the operation * * RETURN:      Status * * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric *              operators (LAnd and LOr), both operands must be integers. * *              Note: cleanest machine code seems to be produced by the code *              below, rather than using statements of the form: *                  Result = (Integer0 && Integer1); * ******************************************************************************/ acpi_statusacpi_ex_do_logical_numeric_op(u16 opcode,			      acpi_integer integer0,

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