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android_kernel_xiaomi_sm8350/drivers/acpi/executer/exoparg1.c
Robert Moore 44f6c01242 ACPICA 20050408 from Bob Moore 
Fixed three cases in the interpreter where an "index"
argument to an ASL function was still (internally) 32
bits instead of the required 64 bits.  This was the Index
argument to the Index, Mid, and Match operators.

The "strupr" function is now permanently local
(acpi_ut_strupr), since this is not a POSIX-defined
function and not present in most kernel-level C
libraries. References to the C library strupr function
have been removed from the headers.

Completed the deployment of static
functions/prototypes. All prototypes with the static
attribute have been moved from the headers to the owning
C file.

ACPICA 20050329 from Bob Moore

An error is now generated if an attempt is made to create
a Buffer Field of length zero (A CreateField with a length
operand of zero.)

The interpreter now issues a warning whenever executable
code at the module level is detected during ACPI table
load. This will give some idea of the prevalence of this
type of code.

Implemented support for references to named objects (other
than control methods) within package objects.

Enhanced package object output for the debug
object. Package objects are now completely dumped, showing
all elements.

Enhanced miscellaneous object output for the debug
object. Any object can now be written to the debug object
(for example, a device object can be written, and the type
of the object will be displayed.)

The "static" qualifier has been added to all local
functions across the core subsystem.

The number of "long" lines (> 80 chars) within the source
has been significantly reduced, by about 1/3.

Cleaned up all header files to ensure that all CA/iASL
functions are prototyped (even static functions) and the
formatting is consistent.

Two new header files have been added, acopcode.h and
acnames.h.

Removed several obsolete functions that were no longer
used.

Signed-off-by: Len Brown <len.brown@intel.com>
2005-07-12 00:08:52 -04:00

1032 lines
27 KiB
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/******************************************************************************
*
* Module Name: exoparg1 - AML execution - opcodes with 1 argument
*
*****************************************************************************/
/*
* 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/acparser.h>
#include <acpi/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exoparg1")
/*!
* Naming convention for AML interpreter execution routines.
*
* The routines that begin execution of AML opcodes are named with a common
* convention based upon the number of arguments, the number of target operands,
* and whether or not a value is returned:
*
* AcpiExOpcode_xA_yT_zR
*
* Where:
*
* xA - ARGUMENTS: The number of arguments (input operands) that are
* required for this opcode type (0 through 6 args).
* yT - TARGETS: The number of targets (output operands) that are required
* for this opcode type (0, 1, or 2 targets).
* zR - RETURN VALUE: Indicates whether this opcode type returns a value
* as the function return (0 or 1).
*
* The AcpiExOpcode* functions are called via the Dispatcher component with
* fully resolved operands.
!*/
/*******************************************************************************
*
* FUNCTION: acpi_ex_opcode_0A_0T_1R
*
* PARAMETERS: walk_state - Current state (contains AML opcode)
*
* RETURN: Status
*
* DESCRIPTION: Execute operator with no operands, one return value
*
******************************************************************************/
acpi_status
acpi_ex_opcode_0A_0T_1R (
struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
union acpi_operand_object *return_desc = NULL;
ACPI_FUNCTION_TRACE_STR ("ex_opcode_0A_0T_1R",
acpi_ps_get_opcode_name (walk_state->opcode));
/* Examine the AML opcode */
switch (walk_state->opcode) {
case AML_TIMER_OP: /* Timer () */
/* Create a return object of type Integer */
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
return_desc->integer.value = acpi_os_get_timer ();
break;
default: /* Unknown opcode */
ACPI_REPORT_ERROR (("acpi_ex_opcode_0A_0T_1R: Unknown opcode %X\n",
walk_state->opcode));
status = AE_AML_BAD_OPCODE;
break;
}
cleanup:
if (!walk_state->result_obj) {
walk_state->result_obj = return_desc;
}
/* Delete return object on error */
if (ACPI_FAILURE (status)) {
acpi_ut_remove_reference (return_desc);
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_opcode_1A_0T_0R
*
* PARAMETERS: walk_state - Current state (contains AML opcode)
*
* RETURN: Status
*
* DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
* object stack
*
******************************************************************************/
acpi_status
acpi_ex_opcode_1A_0T_0R (
struct acpi_walk_state *walk_state)
{
union acpi_operand_object **operand = &walk_state->operands[0];
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_0R",
acpi_ps_get_opcode_name (walk_state->opcode));
/* Examine the AML opcode */
switch (walk_state->opcode) {
case AML_RELEASE_OP: /* Release (mutex_object) */
status = acpi_ex_release_mutex (operand[0], walk_state);
break;
case AML_RESET_OP: /* Reset (event_object) */
status = acpi_ex_system_reset_event (operand[0]);
break;
case AML_SIGNAL_OP: /* Signal (event_object) */
status = acpi_ex_system_signal_event (operand[0]);
break;
case AML_SLEEP_OP: /* Sleep (msec_time) */
status = acpi_ex_system_do_suspend (operand[0]->integer.value);
break;
case AML_STALL_OP: /* Stall (usec_time) */
status = acpi_ex_system_do_stall ((u32) operand[0]->integer.value);
break;
case AML_UNLOAD_OP: /* Unload (Handle) */
status = acpi_ex_unload_table (operand[0]);
break;
default: /* Unknown opcode */
ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_0R: Unknown opcode %X\n",
walk_state->opcode));
status = AE_AML_BAD_OPCODE;
break;
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_opcode_1A_1T_0R
*
* PARAMETERS: walk_state - Current state (contains AML opcode)
*
* RETURN: Status
*
* DESCRIPTION: Execute opcode with one argument, one target, and no
* return value.
*
******************************************************************************/
acpi_status
acpi_ex_opcode_1A_1T_0R (
struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
union acpi_operand_object **operand = &walk_state->operands[0];
ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_0R",
acpi_ps_get_opcode_name (walk_state->opcode));
/* Examine the AML opcode */
switch (walk_state->opcode) {
case AML_LOAD_OP:
status = acpi_ex_load_op (operand[0], operand[1], walk_state);
break;
default: /* Unknown opcode */
ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_0R: Unknown opcode %X\n",
walk_state->opcode));
status = AE_AML_BAD_OPCODE;
goto cleanup;
}
cleanup:
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_opcode_1A_1T_1R
*
* PARAMETERS: walk_state - Current state (contains AML opcode)
*
* RETURN: Status
*
* DESCRIPTION: Execute opcode with one argument, one target, and a
* return value.
*
******************************************************************************/
acpi_status
acpi_ex_opcode_1A_1T_1R (
struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
union acpi_operand_object **operand = &walk_state->operands[0];
union acpi_operand_object *return_desc = NULL;
union acpi_operand_object *return_desc2 = NULL;
u32 temp32;
u32 i;
acpi_integer power_of_ten;
acpi_integer digit;
ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_1R",
acpi_ps_get_opcode_name (walk_state->opcode));
/* Examine the AML opcode */
switch (walk_state->opcode) {
case AML_BIT_NOT_OP:
case AML_FIND_SET_LEFT_BIT_OP:
case AML_FIND_SET_RIGHT_BIT_OP:
case AML_FROM_BCD_OP:
case AML_TO_BCD_OP:
case AML_COND_REF_OF_OP:
/* Create a return object of type Integer for these opcodes */
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
switch (walk_state->opcode) {
case AML_BIT_NOT_OP: /* Not (Operand, Result) */
return_desc->integer.value = ~operand[0]->integer.value;
break;
case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
return_desc->integer.value = operand[0]->integer.value;
/*
* Acpi specification describes Integer type as a little
* endian unsigned value, so this boundary condition is valid.
*/
for (temp32 = 0; return_desc->integer.value &&
temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
return_desc->integer.value >>= 1;
}
return_desc->integer.value = temp32;
break;
case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
return_desc->integer.value = operand[0]->integer.value;
/*
* The Acpi specification describes Integer type as a little
* endian unsigned value, so this boundary condition is valid.
*/
for (temp32 = 0; return_desc->integer.value &&
temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
return_desc->integer.value <<= 1;
}
/* Since the bit position is one-based, subtract from 33 (65) */
return_desc->integer.value = temp32 == 0 ? 0 :
(ACPI_INTEGER_BIT_SIZE + 1) - temp32;
break;
case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
/*
* The 64-bit ACPI integer can hold 16 4-bit BCD characters
* (if table is 32-bit, integer can hold 8 BCD characters)
* Convert each 4-bit BCD value
*/
power_of_ten = 1;
return_desc->integer.value = 0;
digit = operand[0]->integer.value;
/* Convert each BCD digit (each is one nybble wide) */
for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) {
/* Get the least significant 4-bit BCD digit */
temp32 = ((u32) digit) & 0xF;
/* Check the range of the digit */
if (temp32 > 9) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"BCD digit too large (not decimal): 0x%X\n",
temp32));
status = AE_AML_NUMERIC_OVERFLOW;
goto cleanup;
}
/* Sum the digit into the result with the current power of 10 */
return_desc->integer.value += (((acpi_integer) temp32) *
power_of_ten);
/* Shift to next BCD digit */
digit >>= 4;
/* Next power of 10 */
power_of_ten *= 10;
}
break;
case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
return_desc->integer.value = 0;
digit = operand[0]->integer.value;
/* Each BCD digit is one nybble wide */
for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) {
(void) acpi_ut_short_divide (digit, 10, &digit, &temp32);
/*
* Insert the BCD digit that resides in the
* remainder from above
*/
return_desc->integer.value |= (((acpi_integer) temp32) <<
ACPI_MUL_4 (i));
}
/* Overflow if there is any data left in Digit */
if (digit > 0) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Integer too large to convert to BCD: %8.8X%8.8X\n",
ACPI_FORMAT_UINT64 (operand[0]->integer.value)));
status = AE_AML_NUMERIC_OVERFLOW;
goto cleanup;
}
break;
case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */
/*
* This op is a little strange because the internal return value is
* different than the return value stored in the result descriptor
* (There are really two return values)
*/
if ((struct acpi_namespace_node *) operand[0] == acpi_gbl_root_node) {
/*
* This means that the object does not exist in the namespace,
* return FALSE
*/
return_desc->integer.value = 0;
goto cleanup;
}
/* Get the object reference, store it, and remove our reference */
status = acpi_ex_get_object_reference (operand[0],
&return_desc2, walk_state);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
status = acpi_ex_store (return_desc2, operand[1], walk_state);
acpi_ut_remove_reference (return_desc2);
/* The object exists in the namespace, return TRUE */
return_desc->integer.value = ACPI_INTEGER_MAX;
goto cleanup;
default:
/* No other opcodes get here */
break;
}
break;
case AML_STORE_OP: /* Store (Source, Target) */
/*
* A store operand is typically a number, string, buffer or lvalue
* Be careful about deleting the source object,
* since the object itself may have been stored.
*/
status = acpi_ex_store (operand[0], operand[1], walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* It is possible that the Store already produced a return object */
if (!walk_state->result_obj) {
/*
* Normally, we would remove a reference on the Operand[0]
* parameter; But since it is being used as the internal return
* object (meaning we would normally increment it), the two
* cancel out, and we simply don't do anything.
*/
walk_state->result_obj = operand[0];
walk_state->operands[0] = NULL; /* Prevent deletion */
}
return_ACPI_STATUS (status);
/*
* ACPI 2.0 Opcodes
*/
case AML_COPY_OP: /* Copy (Source, Target) */
status = acpi_ut_copy_iobject_to_iobject (operand[0], &return_desc,
walk_state);
break;
case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */
status = acpi_ex_convert_to_string (operand[0], &return_desc,
ACPI_EXPLICIT_CONVERT_DECIMAL);
if (return_desc == operand[0]) {
/* No conversion performed, add ref to handle return value */
acpi_ut_add_reference (return_desc);
}
break;
case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */
status = acpi_ex_convert_to_string (operand[0], &return_desc,
ACPI_EXPLICIT_CONVERT_HEX);
if (return_desc == operand[0]) {
/* No conversion performed, add ref to handle return value */
acpi_ut_add_reference (return_desc);
}
break;
case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
status = acpi_ex_convert_to_buffer (operand[0], &return_desc);
if (return_desc == operand[0]) {
/* No conversion performed, add ref to handle return value */
acpi_ut_add_reference (return_desc);
}
break;
case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
status = acpi_ex_convert_to_integer (operand[0], &return_desc,
ACPI_ANY_BASE);
if (return_desc == operand[0]) {
/* No conversion performed, add ref to handle return value */
acpi_ut_add_reference (return_desc);
}
break;
case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
/* These are two obsolete opcodes */
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"%s is obsolete and not implemented\n",
acpi_ps_get_opcode_name (walk_state->opcode)));
status = AE_SUPPORT;
goto cleanup;
default: /* Unknown opcode */
ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_1R: Unknown opcode %X\n",
walk_state->opcode));
status = AE_AML_BAD_OPCODE;
goto cleanup;
}
if (ACPI_SUCCESS (status)) {
/* Store the return value computed above into the target object */
status = acpi_ex_store (return_desc, operand[1], walk_state);
}
cleanup:
if (!walk_state->result_obj) {
walk_state->result_obj = return_desc;
}
/* Delete return object on error */
if (ACPI_FAILURE (status)) {
acpi_ut_remove_reference (return_desc);
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_opcode_1A_0T_1R
*
* PARAMETERS: walk_state - Current state (contains AML opcode)
*
* RETURN: Status
*
* DESCRIPTION: Execute opcode with one argument, no target, and a return value
*
******************************************************************************/
acpi_status
acpi_ex_opcode_1A_0T_1R (
struct acpi_walk_state *walk_state)
{
union acpi_operand_object **operand = &walk_state->operands[0];
union acpi_operand_object *temp_desc;
union acpi_operand_object *return_desc = NULL;
acpi_status status = AE_OK;
u32 type;
acpi_integer value;
ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_1R",
acpi_ps_get_opcode_name (walk_state->opcode));
/* Examine the AML opcode */
switch (walk_state->opcode) {
case AML_LNOT_OP: /* LNot (Operand) */
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
/*
* Set result to ONES (TRUE) if Value == 0. Note:
* return_desc->Integer.Value is initially == 0 (FALSE) from above.
*/
if (!operand[0]->integer.value) {
return_desc->integer.value = ACPI_INTEGER_MAX;
}
break;
case AML_DECREMENT_OP: /* Decrement (Operand) */
case AML_INCREMENT_OP: /* Increment (Operand) */
/*
* Create a new integer. Can't just get the base integer and
* increment it because it may be an Arg or Field.
*/
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
/*
* Since we are expecting a Reference operand, it can be either a
* NS Node or an internal object.
*/
temp_desc = operand[0];
if (ACPI_GET_DESCRIPTOR_TYPE (temp_desc) == ACPI_DESC_TYPE_OPERAND) {
/* Internal reference object - prevent deletion */
acpi_ut_add_reference (temp_desc);
}
/*
* Convert the Reference operand to an Integer (This removes a
* reference on the Operand[0] object)
*
* NOTE: We use LNOT_OP here in order to force resolution of the
* reference operand to an actual integer.
*/
status = acpi_ex_resolve_operands (AML_LNOT_OP, &temp_desc, walk_state);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s: bad operand(s) %s\n",
acpi_ps_get_opcode_name (walk_state->opcode),
acpi_format_exception(status)));
goto cleanup;
}
/*
* temp_desc is now guaranteed to be an Integer object --
* Perform the actual increment or decrement
*/
if (walk_state->opcode == AML_INCREMENT_OP) {
return_desc->integer.value = temp_desc->integer.value +1;
}
else {
return_desc->integer.value = temp_desc->integer.value -1;
}
/* Finished with this Integer object */
acpi_ut_remove_reference (temp_desc);
/*
* Store the result back (indirectly) through the original
* Reference object
*/
status = acpi_ex_store (return_desc, operand[0], walk_state);
break;
case AML_TYPE_OP: /* object_type (source_object) */
/*
* Note: The operand is not resolved at this point because we want to
* get the associated object, not its value. For example, we don't
* want to resolve a field_unit to its value, we want the actual
* field_unit object.
*/
/* Get the type of the base object */
status = acpi_ex_resolve_multiple (walk_state, operand[0], &type, NULL);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
/* Allocate a descriptor to hold the type. */
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
return_desc->integer.value = type;
break;
case AML_SIZE_OF_OP: /* size_of (source_object) */
/*
* Note: The operand is not resolved at this point because we want to
* get the associated object, not its value.
*/
/* Get the base object */
status = acpi_ex_resolve_multiple (walk_state,
operand[0], &type, &temp_desc);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
/*
* The type of the base object must be integer, buffer, string, or
* package. All others are not supported.
*
* NOTE: Integer is not specifically supported by the ACPI spec,
* but is supported implicitly via implicit operand conversion.
* rather than bother with conversion, we just use the byte width
* global (4 or 8 bytes).
*/
switch (type) {
case ACPI_TYPE_INTEGER:
value = acpi_gbl_integer_byte_width;
break;
case ACPI_TYPE_BUFFER:
value = temp_desc->buffer.length;
break;
case ACPI_TYPE_STRING:
value = temp_desc->string.length;
break;
case ACPI_TYPE_PACKAGE:
value = temp_desc->package.count;
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"size_of - Operand is not Buf/Int/Str/Pkg - found type %s\n",
acpi_ut_get_type_name (type)));
status = AE_AML_OPERAND_TYPE;
goto cleanup;
}
/*
* Now that we have the size of the object, create a result
* object to hold the value
*/
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
return_desc->integer.value = value;
break;
case AML_REF_OF_OP: /* ref_of (source_object) */
status = acpi_ex_get_object_reference (operand[0], &return_desc, walk_state);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
break;
case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
/* Check for a method local or argument, or standalone String */
if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) != ACPI_DESC_TYPE_NAMED) {
switch (ACPI_GET_OBJECT_TYPE (operand[0])) {
case ACPI_TYPE_LOCAL_REFERENCE:
/*
* This is a deref_of (local_x | arg_x)
*
* Must resolve/dereference the local/arg reference first
*/
switch (operand[0]->reference.opcode) {
case AML_LOCAL_OP:
case AML_ARG_OP:
/* Set Operand[0] to the value of the local/arg */
status = acpi_ds_method_data_get_value (
operand[0]->reference.opcode,
operand[0]->reference.offset,
walk_state, &temp_desc);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
/*
* Delete our reference to the input object and
* point to the object just retrieved
*/
acpi_ut_remove_reference (operand[0]);
operand[0] = temp_desc;
break;
case AML_REF_OF_OP:
/* Get the object to which the reference refers */
temp_desc = operand[0]->reference.object;
acpi_ut_remove_reference (operand[0]);
operand[0] = temp_desc;
break;
default:
/* Must be an Index op - handled below */
break;
}
break;
case ACPI_TYPE_STRING:
/*
* This is a deref_of (String). The string is a reference
* to a named ACPI object.
*
* 1) Find the owning Node
* 2) Dereference the node to an actual object. Could be a
* Field, so we need to resolve the node to a value.
*/
status = acpi_ns_get_node_by_path (operand[0]->string.pointer,
walk_state->scope_info->scope.node,
ACPI_NS_SEARCH_PARENT,
ACPI_CAST_INDIRECT_PTR (
struct acpi_namespace_node, &return_desc));
if (ACPI_FAILURE (status)) {
goto cleanup;
}
status = acpi_ex_resolve_node_to_value (
ACPI_CAST_INDIRECT_PTR (
struct acpi_namespace_node, &return_desc),
walk_state);
goto cleanup;
default:
status = AE_AML_OPERAND_TYPE;
goto cleanup;
}
}
/* Operand[0] may have changed from the code above */
if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) == ACPI_DESC_TYPE_NAMED) {
/*
* This is a deref_of (object_reference)
* Get the actual object from the Node (This is the dereference).
* This case may only happen when a local_x or arg_x is
* dereferenced above.
*/
return_desc = acpi_ns_get_attached_object (
(struct acpi_namespace_node *) operand[0]);
}
else {
/*
* This must be a reference object produced by either the
* Index() or ref_of() operator
*/
switch (operand[0]->reference.opcode) {
case AML_INDEX_OP:
/*
* The target type for the Index operator must be
* either a Buffer or a Package
*/
switch (operand[0]->reference.target_type) {
case ACPI_TYPE_BUFFER_FIELD:
temp_desc = operand[0]->reference.object;
/*
* Create a new object that contains one element of the
* buffer -- the element pointed to by the index.
*
* NOTE: index into a buffer is NOT a pointer to a
* sub-buffer of the main buffer, it is only a pointer to a
* single element (byte) of the buffer!
*/
return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
/*
* Since we are returning the value of the buffer at the
* indexed location, we don't need to add an additional
* reference to the buffer itself.
*/
return_desc->integer.value =
temp_desc->buffer.pointer[operand[0]->reference.offset];
break;
case ACPI_TYPE_PACKAGE:
/*
* Return the referenced element of the package. We must
* add another reference to the referenced object, however.
*/
return_desc = *(operand[0]->reference.where);
if (!return_desc) {
/*
* We can't return a NULL dereferenced value. This is
* an uninitialized package element and is thus a
* severe error.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"NULL package element obj %p\n",
operand[0]));
status = AE_AML_UNINITIALIZED_ELEMENT;
goto cleanup;
}
acpi_ut_add_reference (return_desc);
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unknown Index target_type %X in obj %p\n",
operand[0]->reference.target_type, operand[0]));
status = AE_AML_OPERAND_TYPE;
goto cleanup;
}
break;
case AML_REF_OF_OP:
return_desc = operand[0]->reference.object;
if (ACPI_GET_DESCRIPTOR_TYPE (return_desc) ==
ACPI_DESC_TYPE_NAMED) {
return_desc = acpi_ns_get_attached_object (
(struct acpi_namespace_node *) return_desc);
}
/* Add another reference to the object! */
acpi_ut_add_reference (return_desc);
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unknown opcode in ref(%p) - %X\n",
operand[0], operand[0]->reference.opcode));
status = AE_TYPE;
goto cleanup;
}
}
break;
default:
ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_1R: Unknown opcode %X\n",
walk_state->opcode));
status = AE_AML_BAD_OPCODE;
goto cleanup;
}
cleanup:
/* Delete return object on error */
if (ACPI_FAILURE (status)) {
acpi_ut_remove_reference (return_desc);
}
walk_state->result_obj = return_desc;
return_ACPI_STATUS (status);
}
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