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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/acpi/acpica/dsobject.c

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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: dsobject - Dispatcher object management routines
*
* Copyright (C) 2000 - 2020, Intel Corp.
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acnamesp.h"
#include "acinterp.h"
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dsobject")
/*******************************************************************************
*
* FUNCTION: acpi_ds_build_internal_object
*
* PARAMETERS: walk_state - Current walk state
* op - Parser object to be translated
* obj_desc_ptr - Where the ACPI internal object is returned
*
* RETURN: Status
*
* DESCRIPTION: Translate a parser Op object to the equivalent namespace object
* Simple objects are any objects other than a package object!
*
******************************************************************************/
acpi_status
acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
union acpi_operand_object **obj_desc_ptr)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(ds_build_internal_object);
*obj_desc_ptr = NULL;
if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
/*
* This is a named object reference. If this name was
* previously looked up in the namespace, it was stored in
* this op. Otherwise, go ahead and look it up now
*/
if (!op->common.node) {
/* Check if we are resolving a named reference within a package */
if ((op->common.parent->common.aml_opcode ==
AML_PACKAGE_OP)
|| (op->common.parent->common.aml_opcode ==
AML_VARIABLE_PACKAGE_OP)) {
/*
* We won't resolve package elements here, we will do this
* after all ACPI tables are loaded into the namespace. This
* behavior supports both forward references to named objects
* and external references to objects in other tables.
*/
goto create_new_object;
} else {
status = acpi_ns_lookup(walk_state->scope_info,
op->common.value.string,
ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT |
ACPI_NS_DONT_OPEN_SCOPE,
NULL,
ACPI_CAST_INDIRECT_PTR
(struct
acpi_namespace_node,
&(op->common.node)));
if (ACPI_FAILURE(status)) {
ACPI_ERROR_NAMESPACE(walk_state->
scope_info,
op->common.value.
string, status);
return_ACPI_STATUS(status);
}
}
}
}
create_new_object:
/* Create and init a new internal ACPI object */
obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
(op->common.aml_opcode))->
object_type);
if (!obj_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
status =
acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
&obj_desc);
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*
* Handling for unresolved package reference elements.
* These are elements that are namepaths.
*/
if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
obj_desc->reference.resolved = TRUE;
if ((op->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
!obj_desc->reference.node) {
/*
* Name was unresolved above.
* Get the prefix node for later lookup
*/
obj_desc->reference.node =
walk_state->scope_info->scope.node;
obj_desc->reference.aml = op->common.aml;
obj_desc->reference.resolved = FALSE;
}
}
*obj_desc_ptr = obj_desc;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_build_internal_buffer_obj
*
* PARAMETERS: walk_state - Current walk state
* op - Parser object to be translated
* buffer_length - Length of the buffer
* obj_desc_ptr - Where the ACPI internal object is returned
*
* RETURN: Status
*
* DESCRIPTION: Translate a parser Op package object to the equivalent
* namespace object
*
******************************************************************************/
acpi_status
acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
u32 buffer_length,
union acpi_operand_object **obj_desc_ptr)
{
union acpi_parse_object *arg;
union acpi_operand_object *obj_desc;
union acpi_parse_object *byte_list;
u32 byte_list_length = 0;
ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj);
/*
* If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
* The buffer object already exists (from the NS node), otherwise it must
* be created.
*/
obj_desc = *obj_desc_ptr;
if (!obj_desc) {
/* Create a new buffer object */
obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
*obj_desc_ptr = obj_desc;
if (!obj_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
}
/*
* Second arg is the buffer data (optional) byte_list can be either
* individual bytes or a string initializer. In either case, a
* byte_list appears in the AML.
*/
arg = op->common.value.arg; /* skip first arg */
byte_list = arg->named.next;
if (byte_list) {
if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
ACPI_ERROR((AE_INFO,
"Expecting bytelist, found AML opcode 0x%X in op %p",
byte_list->common.aml_opcode, byte_list));
acpi_ut_remove_reference(obj_desc);
return (AE_TYPE);
}
byte_list_length = (u32) byte_list->common.value.integer;
}
/*
* The buffer length (number of bytes) will be the larger of:
* 1) The specified buffer length and
* 2) The length of the initializer byte list
*/
obj_desc->buffer.length = buffer_length;
if (byte_list_length > buffer_length) {
obj_desc->buffer.length = byte_list_length;
}
/* Allocate the buffer */
if (obj_desc->buffer.length == 0) {
obj_desc->buffer.pointer = NULL;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Buffer defined with zero length in AML, creating\n"));
} else {
obj_desc->buffer.pointer =
ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length);
if (!obj_desc->buffer.pointer) {
acpi_ut_delete_object_desc(obj_desc);
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Initialize buffer from the byte_list (if present) */
if (byte_list) {
memcpy(obj_desc->buffer.pointer, byte_list->named.data,
byte_list_length);
}
}
obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_node
*
* PARAMETERS: walk_state - Current walk state
* node - NS Node to be initialized
* op - Parser object to be translated
*
* RETURN: Status
*
* DESCRIPTION: Create the object to be associated with a namespace node
*
******************************************************************************/
acpi_status
acpi_ds_create_node(struct acpi_walk_state *walk_state,
struct acpi_namespace_node *node,
union acpi_parse_object *op)
{
acpi_status status;
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);
/*
* Because of the execution pass through the non-control-method
* parts of the table, we can arrive here twice. Only init
* the named object node the first time through
*/
if (acpi_ns_get_attached_object(node)) {
return_ACPI_STATUS(AE_OK);
}
if (!op->common.value.arg) {
/* No arguments, there is nothing to do */
return_ACPI_STATUS(AE_OK);
}
/* Build an internal object for the argument(s) */
status =
acpi_ds_build_internal_object(walk_state, op->common.value.arg,
&obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Re-type the object according to its argument */
node->type = obj_desc->common.type;
/* Attach obj to node */
status = acpi_ns_attach_object(node, obj_desc, node->type);
/* Remove local reference to the object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_init_object_from_op
*
* PARAMETERS: walk_state - Current walk state
* op - Parser op used to init the internal object
* opcode - AML opcode associated with the object
* ret_obj_desc - Namespace object to be initialized
*
* RETURN: Status
*
* DESCRIPTION: Initialize a namespace object from a parser Op and its
* associated arguments. The namespace object is a more compact
* representation of the Op and its arguments.
*
******************************************************************************/
acpi_status
acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
u16 opcode,
union acpi_operand_object **ret_obj_desc)
{
const struct acpi_opcode_info *op_info;
union acpi_operand_object *obj_desc;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ds_init_object_from_op);
obj_desc = *ret_obj_desc;
op_info = acpi_ps_get_opcode_info(opcode);
if (op_info->class == AML_CLASS_UNKNOWN) {
/* Unknown opcode */
return_ACPI_STATUS(AE_TYPE);
}
/* Perform per-object initialization */
switch (obj_desc->common.type) {
case ACPI_TYPE_BUFFER:
/*
* Defer evaluation of Buffer term_arg operand
*/
obj_desc->buffer.node =
ACPI_CAST_PTR(struct acpi_namespace_node,
walk_state->operands[0]);
obj_desc->buffer.aml_start = op->named.data;
obj_desc->buffer.aml_length = op->named.length;
break;
case ACPI_TYPE_PACKAGE:
/*
* Defer evaluation of Package term_arg operand and all
* package elements. (01/2017): We defer the element
* resolution to allow forward references from the package
* in order to provide compatibility with other ACPI
* implementations.
*/
obj_desc->package.node =
ACPI_CAST_PTR(struct acpi_namespace_node,
walk_state->operands[0]);
if (!op->named.data) {
return_ACPI_STATUS(AE_OK);
}
obj_desc->package.aml_start = op->named.data;
obj_desc->package.aml_length = op->named.length;
break;
case ACPI_TYPE_INTEGER:
switch (op_info->type) {
case AML_TYPE_CONSTANT:
/*
* Resolve AML Constants here - AND ONLY HERE!
* All constants are integers.
* We mark the integer with a flag that indicates that it started
* life as a constant -- so that stores to constants will perform
* as expected (noop). zero_op is used as a placeholder for optional
* target operands.
*/
obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
switch (opcode) {
case AML_ZERO_OP:
obj_desc->integer.value = 0;
break;
case AML_ONE_OP:
obj_desc->integer.value = 1;
break;
case AML_ONES_OP:
obj_desc->integer.value = ACPI_UINT64_MAX;
/* Truncate value if we are executing from a 32-bit ACPI table */
(void)acpi_ex_truncate_for32bit_table(obj_desc);
break;
case AML_REVISION_OP:
obj_desc->integer.value = ACPI_CA_VERSION;
break;
default:
ACPI_ERROR((AE_INFO,
"Unknown constant opcode 0x%X",
opcode));
status = AE_AML_OPERAND_TYPE;
break;
}
break;
case AML_TYPE_LITERAL:
obj_desc->integer.value = op->common.value.integer;
if (acpi_ex_truncate_for32bit_table(obj_desc)) {
/* Warn if we found a 64-bit constant in a 32-bit table */
ACPI_WARNING((AE_INFO,
"Truncated 64-bit constant found in 32-bit table: %8.8X%8.8X => %8.8X",
ACPI_FORMAT_UINT64(op->common.
value.integer),
(u32)obj_desc->integer.value));
}
break;
default:
ACPI_ERROR((AE_INFO, "Unknown Integer type 0x%X",
op_info->type));
status = AE_AML_OPERAND_TYPE;
break;
}
break;
case ACPI_TYPE_STRING:
obj_desc->string.pointer = op->common.value.string;
obj_desc->string.length = (u32)strlen(op->common.value.string);
/*
* The string is contained in the ACPI table, don't ever try
* to delete it
*/
obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
break;
case ACPI_TYPE_METHOD:
break;
case ACPI_TYPE_LOCAL_REFERENCE:
switch (op_info->type) {
case AML_TYPE_LOCAL_VARIABLE:
/* Local ID (0-7) is (AML opcode - base AML_FIRST_LOCAL_OP) */
obj_desc->reference.value =
((u32)opcode) - AML_FIRST_LOCAL_OP;
obj_desc->reference.class = ACPI_REFCLASS_LOCAL;
status =
acpi_ds_method_data_get_node(ACPI_REFCLASS_LOCAL,
obj_desc->reference.
value, walk_state,
ACPI_CAST_INDIRECT_PTR
(struct
acpi_namespace_node,
&obj_desc->reference.
object));
break;
case AML_TYPE_METHOD_ARGUMENT:
/* Arg ID (0-6) is (AML opcode - base AML_FIRST_ARG_OP) */
obj_desc->reference.value =
((u32)opcode) - AML_FIRST_ARG_OP;
obj_desc->reference.class = ACPI_REFCLASS_ARG;
status = acpi_ds_method_data_get_node(ACPI_REFCLASS_ARG,
obj_desc->
reference.value,
walk_state,
ACPI_CAST_INDIRECT_PTR
(struct
acpi_namespace_node,
&obj_desc->
reference.
object));
break;
default: /* Object name or Debug object */
switch (op->common.aml_opcode) {
case AML_INT_NAMEPATH_OP:
/* Node was saved in Op */
obj_desc->reference.node = op->common.node;
obj_desc->reference.class = ACPI_REFCLASS_NAME;
if (op->common.node) {
obj_desc->reference.object =
op->common.node->object;
}
break;
case AML_DEBUG_OP:
obj_desc->reference.class = ACPI_REFCLASS_DEBUG;
break;
default:
ACPI_ERROR((AE_INFO,
"Unimplemented reference type for AML opcode: 0x%4.4X",
opcode));
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
break;
}
break;
default:
ACPI_ERROR((AE_INFO, "Unimplemented data type: 0x%X",
obj_desc->common.type));
status = AE_AML_OPERAND_TYPE;
break;
}
return_ACPI_STATUS(status);
}
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