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linux/drivers/acpi/executer/exmisc.c

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/******************************************************************************
*
* Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2008, 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 <acpi/acpi.h>
#include <acpi/acinterp.h>
#include <acpi/amlcode.h>
#include <acpi/amlresrc.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_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_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)
{
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_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_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_integer
acpi_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_status
acpi_ex_do_logical_numeric_op(u16 opcode,
acpi_integer integer0,
acpi_integer integer1, u8 * logical_result)
{
acpi_status status = AE_OK;
u8 local_result = FALSE;
ACPI_FUNCTION_TRACE(ex_do_logical_numeric_op);
switch (opcode) {
case AML_LAND_OP: /* LAnd (Integer0, Integer1) */
if (integer0 && integer1) {
local_result = TRUE;
}
break;
case AML_LOR_OP: /* LOr (Integer0, Integer1) */
if (integer0 || integer1) {
local_result = TRUE;
}
break;
default:
status = AE_AML_INTERNAL;
break;
}
/* Return the logical result and status */
*logical_result = local_result;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_do_logical_op
*
* PARAMETERS: Opcode - AML opcode
* Operand0 - operand #0
* Operand1 - operand #1
* logical_result - TRUE/FALSE result of the operation
*
* RETURN: Status
*
* 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. For the Numeric operators (LAnd and LOr), both
* operands must be integers. For the other logical operators,
* operands can be any combination of Integer/String/Buffer. The
* first operand determines the type to which the second operand
* will be converted.
*
* Note: cleanest machine code seems to be produced by the code
* below, rather than using statements of the form:
* Result = (Operand0 == Operand1);
*
******************************************************************************/
acpi_status
acpi_ex_do_logical_op(u16 opcode,
union acpi_operand_object *operand0,
union acpi_operand_object *operand1, u8 * logical_result)
{
union acpi_operand_object *local_operand1 = operand1;
acpi_integer integer0;
acpi_integer integer1;
u32 length0;
u32 length1;
acpi_status status = AE_OK;
u8 local_result = FALSE;
int compare;
ACPI_FUNCTION_TRACE(ex_do_logical_op);
/*
* Convert the second operand if necessary. The first operand
* determines the type of the second operand, (See the Data Types
* section of the ACPI 3.0+ 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:
status = AE_AML_INTERNAL;
break;
}
if (ACPI_FAILURE(status)) {
goto cleanup;
}
/*
* Two cases: 1) Both Integers, 2) Both Strings or Buffers
*/
if (ACPI_GET_OBJECT_TYPE(operand0) == ACPI_TYPE_INTEGER) {
/*
* 1) Both operands are of type integer
* Note: local_operand1 may have changed above
*/
integer0 = operand0->integer.value;
integer1 = local_operand1->integer.value;
switch (opcode) {
case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
if (integer0 == integer1) {
local_result = TRUE;
}
break;
case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
if (integer0 > integer1) {
local_result = TRUE;
}
break;
case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
if (integer0 < integer1) {
local_result = TRUE;
}
break;
default:
status = AE_AML_INTERNAL;
break;
}
} else {
/*
* 2) Both operands are Strings or both are Buffers
* Note: Code below takes advantage of common Buffer/String
* object fields. local_operand1 may have changed above. Use
* memcmp to handle nulls in buffers.
*/
length0 = operand0->buffer.length;
length1 = local_operand1->buffer.length;
/* Lexicographic compare: compare the data bytes */
compare = ACPI_MEMCMP(operand0->buffer.pointer,
local_operand1->buffer.pointer,
(length0 > length1) ? length1 : length0);
switch (opcode) {
case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
/* Length and all bytes must be equal */
if ((length0 == length1) && (compare == 0)) {
/* Length and all bytes match ==> TRUE */
local_result = TRUE;
}
break;
case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
if (compare > 0) {
local_result = TRUE;
goto cleanup; /* TRUE */
}
if (compare < 0) {
goto cleanup; /* FALSE */
}
/* Bytes match (to shortest length), compare lengths */
if (length0 > length1) {
local_result = TRUE;
}
break;
case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
if (compare > 0) {
goto cleanup; /* FALSE */
}
if (compare < 0) {
local_result = TRUE;
goto cleanup; /* TRUE */
}
/* Bytes match (to shortest length), compare lengths */
if (length0 < length1) {
local_result = TRUE;
}
break;
default:
status = AE_AML_INTERNAL;
break;
}
}
cleanup:
/* New object was created if implicit conversion performed - delete */
if (local_operand1 != operand1) {
acpi_ut_remove_reference(local_operand1);
}
/* Return the logical result and status */
*logical_result = local_result;
return_ACPI_STATUS(status);
}
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