/******************************************************************************
*
* Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2003, 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:
/* The referenced object is the pseudo-node for the local/arg */
referenced_obj = obj_desc->reference.object;
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Reference subtype %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_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid descriptor type %X in %p\n",
ACPI_GET_DESCRIPTOR_TYPE (obj_desc), 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: *obj_desc - Object to be converted. Must be an
* Integer, Buffer, or String
* walk_state - Current walk state
*
* RETURN: Status
*
* DESCRIPTION: Concatenate two resource templates
*
******************************************************************************/
acpi_status
acpi_ex_concat_template (
union acpi_operand_object *obj_desc1,
union acpi_operand_object *obj_desc2,
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 (obj_desc1);
end_tag2 = acpi_ut_get_resource_end_tag (obj_desc2);
if (!end_tag1 || !end_tag2) {
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/* Compute the length of each part */
length1 = ACPI_PTR_DIFF (end_tag1, obj_desc1->buffer.pointer);
length2 = ACPI_PTR_DIFF (end_tag2, obj_desc2->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, obj_desc1->buffer.pointer, length1);
ACPI_MEMCPY (new_buf + length1, obj_desc2->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: obj_desc1 - First source object
* obj_desc2 - 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 *obj_desc1,
union acpi_operand_object *obj_desc2,
union acpi_operand_object **actual_return_desc,
struct acpi_walk_state *walk_state)
{
acpi_status status;
u32 i;
acpi_integer this_integer;
union acpi_operand_object *return_desc;
char *new_buf;
ACPI_FUNCTION_ENTRY ();
/*
* 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 (obj_desc1)) {
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_gbl_integer_byte_width * 2);
if (!return_desc) {
return (AE_NO_MEMORY);
}
new_buf = (char *) return_desc->buffer.pointer;
/* Convert the first integer */
this_integer = obj_desc1->integer.value;
for (i = 0; i < acpi_gbl_integer_byte_width; i++) {
new_buf[i] = (char) this_integer;
this_integer >>= 8;
}
/* Convert the second integer */
this_integer = obj_desc2->integer.value;
for (; i < (ACPI_MUL_2 (acpi_gbl_integer_byte_width)); i++) {
new_buf[i] = (char) this_integer;
this_integer >>= 8;
}
break;
case ACPI_TYPE_STRING:
/* Result of two Strings is a String */
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
if (!return_desc) {
return (AE_NO_MEMORY);
}
/* Operand0 is string */
new_buf = ACPI_MEM_CALLOCATE ((acpi_size) obj_desc1->string.length +
(acpi_size) obj_desc2->string.length + 1);
if (!new_buf) {
ACPI_REPORT_ERROR
(("ex_do_concatenate: String allocation failure\n"));
status = AE_NO_MEMORY;
goto cleanup;
}
/* Concatenate the strings */
ACPI_STRCPY (new_buf, obj_desc1->string.pointer);
ACPI_STRCPY (new_buf + obj_desc1->string.length,
obj_desc2->string.pointer);
/* Complete the String object initialization */
return_desc->string.pointer = new_buf;
return_desc->string.length = obj_desc1->string.length +
obj_desc2->string.length;
break;
case ACPI_TYPE_BUFFER:
/* Result of two Buffers is a Buffer */
return_desc = acpi_ut_create_buffer_object (
(acpi_size) obj_desc1->buffer.length +
(acpi_size) obj_desc2->buffer.length);
if (!return_desc) {
return (AE_NO_MEMORY);
}
new_buf = (char *) return_desc->buffer.pointer;
/* Concatenate the buffers */
ACPI_MEMCPY (new_buf, obj_desc1->buffer.pointer,
obj_desc1->buffer.length);
ACPI_MEMCPY (new_buf + obj_desc1->buffer.length, obj_desc2->buffer.pointer,
obj_desc2->buffer.length);
break;
default:
/* Invalid object type, should not happen here */
status = AE_AML_INTERNAL;
return_desc = NULL;
}
*actual_return_desc = return_desc;
return (AE_OK);
cleanup:
acpi_ut_remove_reference (return_desc);
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_do_math_op
*
* PARAMETERS: Opcode - AML opcode
* Operand0 - Integer operand #0
* Operand1 - 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_integer
acpi_ex_do_math_op (
u16 opcode,
acpi_integer operand0,
acpi_integer operand1)
{
switch (opcode) {
case AML_ADD_OP: /* Add (Operand0, Operand1, Result) */
return (operand0 + operand1);
case AML_BIT_AND_OP: /* And (Operand0, Operand1, Result) */
return (operand0 & operand1);
case AML_BIT_NAND_OP: /* NAnd (Operand0, Operand1, Result) */
return (~(operand0 & operand1));
case AML_BIT_OR_OP: /* Or (Operand0, Operand1, Result) */
return (operand0 | operand1);
case AML_BIT_NOR_OP: /* NOr (Operand0, Operand1, Result) */
return (~(operand0 | operand1));
case AML_BIT_XOR_OP: /* XOr (Operand0, Operand1, Result) */
return (operand0 ^ operand1);
case AML_MULTIPLY_OP: /* Multiply (Operand0, Operand1, Result) */
return (operand0 * operand1);
case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
return (operand0 << operand1);
case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */
return (operand0 >> operand1);
case AML_SUBTRACT_OP: /* Subtract (Operand0, Operand1, Result) */
return (operand0 - operand1);
default:
return (0);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_do_logical_op
*
* PARAMETERS: Opcode - AML opcode
* Operand0 - Integer operand #0
* Operand1 - Integer operand #1
*
* RETURN: TRUE/FALSE result of the operation
*
* DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
* functions here is to prevent a lot of pointer dereferencing
* to obtain the operands and to simplify the generation of the
* logical value.
*
* Note: cleanest machine code seems to be produced by the code
* below, rather than using statements of the form:
* Result = (Operand0 == Operand1);
*
******************************************************************************/
u8
acpi_ex_do_logical_op (
u16 opcode,
acpi_integer operand0,
acpi_integer operand1)
{
switch (opcode) {
case AML_LAND_OP: /* LAnd (Operand0, Operand1) */
if (operand0 && operand1) {
return (TRUE);
}
break;
case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
if (operand0 == operand1) {
return (TRUE);
}
break;
case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
if (operand0 > operand1) {
return (TRUE);
}
break;
case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
if (operand0 < operand1) {
return (TRUE);
}
break;
case AML_LOR_OP: /* LOr (Operand0, Operand1) */
if (operand0 || operand1) {
return (TRUE);
}
break;
default:
break;
}
return (FALSE);
}
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