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745 lines
20 KiB
745 lines
20 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/******************************************************************************* |
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* |
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* Module Name: nsaccess - Top-level functions for accessing ACPI namespace |
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* |
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******************************************************************************/ |
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|
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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "amlcode.h" |
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#include "acnamesp.h" |
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#include "acdispat.h" |
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|
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#ifdef ACPI_ASL_COMPILER |
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#include "acdisasm.h" |
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#endif |
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|
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#define _COMPONENT ACPI_NAMESPACE |
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ACPI_MODULE_NAME("nsaccess") |
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|
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_root_initialize |
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* |
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* PARAMETERS: None |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Allocate and initialize the default root named objects |
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* |
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* MUTEX: Locks namespace for entire execution |
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* |
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******************************************************************************/ |
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acpi_status acpi_ns_root_initialize(void) |
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{ |
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acpi_status status; |
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const struct acpi_predefined_names *init_val = NULL; |
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struct acpi_namespace_node *new_node; |
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struct acpi_namespace_node *prev_node = NULL; |
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union acpi_operand_object *obj_desc; |
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acpi_string val = NULL; |
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|
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ACPI_FUNCTION_TRACE(ns_root_initialize); |
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|
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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|
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/* |
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* The global root ptr is initially NULL, so a non-NULL value indicates |
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* that acpi_ns_root_initialize() has already been called; just return. |
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*/ |
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if (acpi_gbl_root_node) { |
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status = AE_OK; |
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goto unlock_and_exit; |
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} |
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|
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/* |
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* Tell the rest of the subsystem that the root is initialized |
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* (This is OK because the namespace is locked) |
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*/ |
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acpi_gbl_root_node = &acpi_gbl_root_node_struct; |
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|
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/* Enter the predefined names in the name table */ |
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|
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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"Entering predefined entries into namespace\n")); |
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|
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/* |
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* Create the initial (default) namespace. |
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* This namespace looks like something similar to this: |
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* |
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* ACPI Namespace (from Namespace Root): |
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* 0 _GPE Scope 00203160 00 |
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* 0 _PR_ Scope 002031D0 00 |
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* 0 _SB_ Device 00203240 00 Notify Object: 0020ADD8 |
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* 0 _SI_ Scope 002032B0 00 |
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* 0 _TZ_ Device 00203320 00 |
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* 0 _REV Integer 00203390 00 = 0000000000000002 |
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* 0 _OS_ String 00203488 00 Len 14 "Microsoft Windows NT" |
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* 0 _GL_ Mutex 00203580 00 Object 002035F0 |
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* 0 _OSI Method 00203678 00 Args 1 Len 0000 Aml 00000000 |
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*/ |
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for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) { |
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status = AE_OK; |
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|
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/* _OSI is optional for now, will be permanent later */ |
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if (!strcmp(init_val->name, "_OSI") |
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&& !acpi_gbl_create_osi_method) { |
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continue; |
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} |
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/* |
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* Create, init, and link the new predefined name |
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* Note: No need to use acpi_ns_lookup here because all the |
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* predefined names are at the root level. It is much easier to |
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* just create and link the new node(s) here. |
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*/ |
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new_node = |
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acpi_ns_create_node(*ACPI_CAST_PTR(u32, init_val->name)); |
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if (!new_node) { |
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status = AE_NO_MEMORY; |
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goto unlock_and_exit; |
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} |
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new_node->descriptor_type = ACPI_DESC_TYPE_NAMED; |
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new_node->type = init_val->type; |
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if (!prev_node) { |
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acpi_gbl_root_node_struct.child = new_node; |
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} else { |
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prev_node->peer = new_node; |
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} |
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new_node->parent = &acpi_gbl_root_node_struct; |
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prev_node = new_node; |
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|
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/* |
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* Name entered successfully. If entry in pre_defined_names[] specifies |
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* an initial value, create the initial value. |
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*/ |
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if (init_val->val) { |
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status = acpi_os_predefined_override(init_val, &val); |
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if (ACPI_FAILURE(status)) { |
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ACPI_ERROR((AE_INFO, |
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"Could not override predefined %s", |
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init_val->name)); |
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} |
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if (!val) { |
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val = init_val->val; |
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} |
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/* |
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* Entry requests an initial value, allocate a |
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* descriptor for it. |
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*/ |
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obj_desc = |
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acpi_ut_create_internal_object(init_val->type); |
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if (!obj_desc) { |
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status = AE_NO_MEMORY; |
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goto unlock_and_exit; |
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} |
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/* |
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* Convert value string from table entry to |
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* internal representation. Only types actually |
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* used for initial values are implemented here. |
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*/ |
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switch (init_val->type) { |
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case ACPI_TYPE_METHOD: |
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obj_desc->method.param_count = |
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(u8) ACPI_TO_INTEGER(val); |
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obj_desc->common.flags |= AOPOBJ_DATA_VALID; |
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#if defined (ACPI_ASL_COMPILER) |
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/* Save the parameter count for the iASL compiler */ |
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new_node->value = obj_desc->method.param_count; |
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#else |
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/* Mark this as a very SPECIAL method (_OSI) */ |
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obj_desc->method.info_flags = |
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ACPI_METHOD_INTERNAL_ONLY; |
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obj_desc->method.dispatch.implementation = |
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acpi_ut_osi_implementation; |
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#endif |
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break; |
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case ACPI_TYPE_INTEGER: |
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obj_desc->integer.value = ACPI_TO_INTEGER(val); |
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break; |
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case ACPI_TYPE_STRING: |
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/* Build an object around the static string */ |
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obj_desc->string.length = (u32)strlen(val); |
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obj_desc->string.pointer = val; |
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obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; |
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break; |
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case ACPI_TYPE_MUTEX: |
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obj_desc->mutex.node = new_node; |
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obj_desc->mutex.sync_level = |
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(u8) (ACPI_TO_INTEGER(val) - 1); |
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/* Create a mutex */ |
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status = |
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acpi_os_create_mutex(&obj_desc->mutex. |
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os_mutex); |
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if (ACPI_FAILURE(status)) { |
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acpi_ut_remove_reference(obj_desc); |
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goto unlock_and_exit; |
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} |
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/* Special case for ACPI Global Lock */ |
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if (strcmp(init_val->name, "_GL_") == 0) { |
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acpi_gbl_global_lock_mutex = obj_desc; |
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/* Create additional counting semaphore for global lock */ |
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status = |
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acpi_os_create_semaphore(1, 0, |
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&acpi_gbl_global_lock_semaphore); |
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if (ACPI_FAILURE(status)) { |
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acpi_ut_remove_reference |
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(obj_desc); |
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goto unlock_and_exit; |
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} |
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} |
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break; |
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default: |
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ACPI_ERROR((AE_INFO, |
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"Unsupported initial type value 0x%X", |
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init_val->type)); |
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acpi_ut_remove_reference(obj_desc); |
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obj_desc = NULL; |
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continue; |
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} |
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/* Store pointer to value descriptor in the Node */ |
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status = acpi_ns_attach_object(new_node, obj_desc, |
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obj_desc->common.type); |
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/* Remove local reference to the object */ |
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acpi_ut_remove_reference(obj_desc); |
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} |
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} |
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unlock_and_exit: |
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
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/* Save a handle to "_GPE", it is always present */ |
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if (ACPI_SUCCESS(status)) { |
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status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, |
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&acpi_gbl_fadt_gpe_device); |
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} |
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return_ACPI_STATUS(status); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_lookup |
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* |
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* PARAMETERS: scope_info - Current scope info block |
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* pathname - Search pathname, in internal format |
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* (as represented in the AML stream) |
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* type - Type associated with name |
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* interpreter_mode - IMODE_LOAD_PASS2 => add name if not found |
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* flags - Flags describing the search restrictions |
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* walk_state - Current state of the walk |
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* return_node - Where the Node is placed (if found |
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* or created successfully) |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Find or enter the passed name in the name space. |
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* Log an error if name not found in Exec mode. |
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* |
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* MUTEX: Assumes namespace is locked. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_lookup(union acpi_generic_state *scope_info, |
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char *pathname, |
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acpi_object_type type, |
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acpi_interpreter_mode interpreter_mode, |
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u32 flags, |
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struct acpi_walk_state *walk_state, |
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struct acpi_namespace_node **return_node) |
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{ |
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acpi_status status; |
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char *path = pathname; |
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char *external_path; |
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struct acpi_namespace_node *prefix_node; |
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struct acpi_namespace_node *current_node = NULL; |
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struct acpi_namespace_node *this_node = NULL; |
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u32 num_segments; |
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u32 num_carats; |
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acpi_name simple_name; |
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acpi_object_type type_to_check_for; |
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acpi_object_type this_search_type; |
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u32 search_parent_flag = ACPI_NS_SEARCH_PARENT; |
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u32 local_flags; |
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acpi_interpreter_mode local_interpreter_mode; |
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ACPI_FUNCTION_TRACE(ns_lookup); |
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if (!return_node) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
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} |
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local_flags = flags & |
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~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | |
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ACPI_NS_SEARCH_PARENT); |
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*return_node = ACPI_ENTRY_NOT_FOUND; |
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acpi_gbl_ns_lookup_count++; |
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if (!acpi_gbl_root_node) { |
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return_ACPI_STATUS(AE_NO_NAMESPACE); |
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} |
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/* Get the prefix scope. A null scope means use the root scope */ |
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if ((!scope_info) || (!scope_info->scope.node)) { |
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Null scope prefix, using root node (%p)\n", |
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acpi_gbl_root_node)); |
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prefix_node = acpi_gbl_root_node; |
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} else { |
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prefix_node = scope_info->scope.node; |
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if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) != |
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ACPI_DESC_TYPE_NAMED) { |
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ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]", |
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prefix_node, |
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acpi_ut_get_descriptor_name(prefix_node))); |
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return_ACPI_STATUS(AE_AML_INTERNAL); |
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} |
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if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) { |
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/* |
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* This node might not be a actual "scope" node (such as a |
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* Device/Method, etc.) It could be a Package or other object |
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* node. Backup up the tree to find the containing scope node. |
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*/ |
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while (!acpi_ns_opens_scope(prefix_node->type) && |
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prefix_node->type != ACPI_TYPE_ANY) { |
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prefix_node = prefix_node->parent; |
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} |
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} |
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} |
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/* Save type. TBD: may be no longer necessary */ |
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type_to_check_for = type; |
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/* |
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* Begin examination of the actual pathname |
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*/ |
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if (!pathname) { |
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/* A Null name_path is allowed and refers to the root */ |
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num_segments = 0; |
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this_node = acpi_gbl_root_node; |
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path = ""; |
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Null Pathname (Zero segments), Flags=%X\n", |
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flags)); |
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} else { |
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/* |
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* Name pointer is valid (and must be in internal name format) |
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* |
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* Check for scope prefixes: |
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* |
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* As represented in the AML stream, a namepath consists of an |
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* optional scope prefix followed by a name segment part. |
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* |
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* If present, the scope prefix is either a Root Prefix (in |
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* which case the name is fully qualified), or one or more |
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* Parent Prefixes (in which case the name's scope is relative |
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* to the current scope). |
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*/ |
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if (*path == (u8) AML_ROOT_PREFIX) { |
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/* Pathname is fully qualified, start from the root */ |
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this_node = acpi_gbl_root_node; |
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search_parent_flag = ACPI_NS_NO_UPSEARCH; |
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/* Point to name segment part */ |
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path++; |
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Path is absolute from root [%p]\n", |
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this_node)); |
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} else { |
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/* Pathname is relative to current scope, start there */ |
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Searching relative to prefix scope [%4.4s] (%p)\n", |
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acpi_ut_get_node_name(prefix_node), |
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prefix_node)); |
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/* |
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* Handle multiple Parent Prefixes (carat) by just getting |
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* the parent node for each prefix instance. |
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*/ |
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this_node = prefix_node; |
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num_carats = 0; |
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while (*path == (u8) AML_PARENT_PREFIX) { |
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|
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/* Name is fully qualified, no search rules apply */ |
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search_parent_flag = ACPI_NS_NO_UPSEARCH; |
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/* |
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* Point past this prefix to the name segment |
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* part or the next Parent Prefix |
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*/ |
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path++; |
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|
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/* Backup to the parent node */ |
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num_carats++; |
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this_node = this_node->parent; |
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if (!this_node) { |
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/* |
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* Current scope has no parent scope. Externalize |
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* the internal path for error message. |
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*/ |
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status = |
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acpi_ns_externalize_name |
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(ACPI_UINT32_MAX, pathname, NULL, |
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&external_path); |
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if (ACPI_SUCCESS(status)) { |
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ACPI_ERROR((AE_INFO, |
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"%s: Path has too many parent prefixes (^)", |
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external_path)); |
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ACPI_FREE(external_path); |
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} |
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return_ACPI_STATUS(AE_NOT_FOUND); |
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} |
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} |
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if (search_parent_flag == ACPI_NS_NO_UPSEARCH) { |
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Search scope is [%4.4s], path has %u carat(s)\n", |
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acpi_ut_get_node_name |
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(this_node), num_carats)); |
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} |
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} |
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|
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/* |
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* Determine the number of ACPI name segments in this pathname. |
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* |
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* The segment part consists of either: |
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* - A Null name segment (0) |
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* - A dual_name_prefix followed by two 4-byte name segments |
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* - A multi_name_prefix followed by a byte indicating the |
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* number of segments and the segments themselves. |
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* - A single 4-byte name segment |
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* |
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* Examine the name prefix opcode, if any, to determine the number of |
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* segments. |
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*/ |
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switch (*path) { |
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case 0: |
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/* |
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* Null name after a root or parent prefixes. We already |
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* have the correct target node and there are no name segments. |
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*/ |
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num_segments = 0; |
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type = this_node->type; |
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|
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Prefix-only Pathname (Zero name segments), Flags=%X\n", |
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flags)); |
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break; |
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|
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case AML_DUAL_NAME_PREFIX: |
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|
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/* More than one name_seg, search rules do not apply */ |
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search_parent_flag = ACPI_NS_NO_UPSEARCH; |
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/* Two segments, point to first name segment */ |
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num_segments = 2; |
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path++; |
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Dual Pathname (2 segments, Flags=%X)\n", |
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flags)); |
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break; |
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|
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case AML_MULTI_NAME_PREFIX: |
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|
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/* More than one name_seg, search rules do not apply */ |
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search_parent_flag = ACPI_NS_NO_UPSEARCH; |
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|
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/* Extract segment count, point to first name segment */ |
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path++; |
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num_segments = (u32) (u8) * path; |
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path++; |
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Multi Pathname (%u Segments, Flags=%X)\n", |
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num_segments, flags)); |
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break; |
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|
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default: |
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/* |
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* Not a Null name, no Dual or Multi prefix, hence there is |
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* only one name segment and Pathname is already pointing to it. |
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*/ |
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num_segments = 1; |
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|
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
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"Simple Pathname (1 segment, Flags=%X)\n", |
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flags)); |
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break; |
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} |
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|
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ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path)); |
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} |
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|
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/* |
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* Search namespace for each segment of the name. Loop through and |
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* verify (or add to the namespace) each name segment. |
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* |
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* The object type is significant only at the last name |
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* segment. (We don't care about the types along the path, only |
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* the type of the final target object.) |
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*/ |
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this_search_type = ACPI_TYPE_ANY; |
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current_node = this_node; |
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|
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while (num_segments && current_node) { |
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num_segments--; |
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if (!num_segments) { |
|
|
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/* This is the last segment, enable typechecking */ |
|
|
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this_search_type = type; |
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|
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/* |
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* Only allow automatic parent search (search rules) if the caller |
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* requested it AND we have a single, non-fully-qualified name_seg |
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*/ |
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if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) && |
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(flags & ACPI_NS_SEARCH_PARENT)) { |
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local_flags |= ACPI_NS_SEARCH_PARENT; |
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} |
|
|
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/* Set error flag according to caller */ |
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|
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if (flags & ACPI_NS_ERROR_IF_FOUND) { |
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local_flags |= ACPI_NS_ERROR_IF_FOUND; |
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} |
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|
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/* Set override flag according to caller */ |
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|
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if (flags & ACPI_NS_OVERRIDE_IF_FOUND) { |
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local_flags |= ACPI_NS_OVERRIDE_IF_FOUND; |
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} |
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} |
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|
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/* Handle opcodes that create a new name_seg via a full name_path */ |
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|
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local_interpreter_mode = interpreter_mode; |
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if ((flags & ACPI_NS_PREFIX_MUST_EXIST) && (num_segments > 0)) { |
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|
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/* Every element of the path must exist (except for the final name_seg) */ |
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|
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local_interpreter_mode = ACPI_IMODE_EXECUTE; |
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} |
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|
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/* Extract one ACPI name from the front of the pathname */ |
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|
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ACPI_MOVE_32_TO_32(&simple_name, path); |
|
|
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/* Try to find the single (4 character) ACPI name */ |
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|
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status = |
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acpi_ns_search_and_enter(simple_name, walk_state, |
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current_node, |
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local_interpreter_mode, |
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this_search_type, local_flags, |
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&this_node); |
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if (ACPI_FAILURE(status)) { |
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if (status == AE_NOT_FOUND) { |
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#if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */ |
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if (flags & ACPI_NS_PREFIX_MUST_EXIST) { |
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acpi_os_printf(ACPI_MSG_BIOS_ERROR |
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"Object does not exist: %4.4s\n", |
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(char *)&simple_name); |
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} |
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#endif |
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/* Name not found in ACPI namespace */ |
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|
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
|
"Name [%4.4s] not found in scope [%4.4s] %p\n", |
|
(char *)&simple_name, |
|
(char *)¤t_node->name, |
|
current_node)); |
|
} |
|
#ifdef ACPI_EXEC_APP |
|
if ((status == AE_ALREADY_EXISTS) && |
|
(this_node->flags & ANOBJ_NODE_EARLY_INIT)) { |
|
this_node->flags &= ~ANOBJ_NODE_EARLY_INIT; |
|
status = AE_OK; |
|
} |
|
#endif |
|
|
|
#ifdef ACPI_ASL_COMPILER |
|
/* |
|
* If this ACPI name already exists within the namespace as an |
|
* external declaration, then mark the external as a conflicting |
|
* declaration and proceed to process the current node as if it did |
|
* not exist in the namespace. If this node is not processed as |
|
* normal, then it could cause improper namespace resolution |
|
* by failing to open a new scope. |
|
*/ |
|
if (acpi_gbl_disasm_flag && |
|
(status == AE_ALREADY_EXISTS) && |
|
((this_node->flags & ANOBJ_IS_EXTERNAL) || |
|
(walk_state |
|
&& walk_state->opcode == AML_EXTERNAL_OP))) { |
|
this_node->flags &= ~ANOBJ_IS_EXTERNAL; |
|
this_node->type = (u8)this_search_type; |
|
if (walk_state->opcode != AML_EXTERNAL_OP) { |
|
acpi_dm_mark_external_conflict |
|
(this_node); |
|
} |
|
break; |
|
} |
|
#endif |
|
|
|
*return_node = this_node; |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/* More segments to follow? */ |
|
|
|
if (num_segments > 0) { |
|
/* |
|
* If we have an alias to an object that opens a scope (such as a |
|
* device or processor), we need to dereference the alias here so |
|
* that we can access any children of the original node (via the |
|
* remaining segments). |
|
*/ |
|
if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) { |
|
if (!this_node->object) { |
|
return_ACPI_STATUS(AE_NOT_EXIST); |
|
} |
|
|
|
if (acpi_ns_opens_scope |
|
(((struct acpi_namespace_node *) |
|
this_node->object)->type)) { |
|
this_node = |
|
(struct acpi_namespace_node *) |
|
this_node->object; |
|
} |
|
} |
|
} |
|
|
|
/* Special handling for the last segment (num_segments == 0) */ |
|
|
|
else { |
|
/* |
|
* Sanity typecheck of the target object: |
|
* |
|
* If 1) This is the last segment (num_segments == 0) |
|
* 2) And we are looking for a specific type |
|
* (Not checking for TYPE_ANY) |
|
* 3) Which is not an alias |
|
* 4) Which is not a local type (TYPE_SCOPE) |
|
* 5) And the type of target object is known (not TYPE_ANY) |
|
* 6) And target object does not match what we are looking for |
|
* |
|
* Then we have a type mismatch. Just warn and ignore it. |
|
*/ |
|
if ((type_to_check_for != ACPI_TYPE_ANY) && |
|
(type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) && |
|
(type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) |
|
&& (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) |
|
&& (this_node->type != ACPI_TYPE_ANY) |
|
&& (this_node->type != type_to_check_for)) { |
|
|
|
/* Complain about a type mismatch */ |
|
|
|
ACPI_WARNING((AE_INFO, |
|
"NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", |
|
ACPI_CAST_PTR(char, &simple_name), |
|
acpi_ut_get_type_name(this_node-> |
|
type), |
|
acpi_ut_get_type_name |
|
(type_to_check_for))); |
|
} |
|
|
|
/* |
|
* If this is the last name segment and we are not looking for a |
|
* specific type, but the type of found object is known, use that |
|
* type to (later) see if it opens a scope. |
|
*/ |
|
if (type == ACPI_TYPE_ANY) { |
|
type = this_node->type; |
|
} |
|
} |
|
|
|
/* Point to next name segment and make this node current */ |
|
|
|
path += ACPI_NAMESEG_SIZE; |
|
current_node = this_node; |
|
} |
|
|
|
/* Always check if we need to open a new scope */ |
|
|
|
if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) { |
|
/* |
|
* If entry is a type which opens a scope, push the new scope on the |
|
* scope stack. |
|
*/ |
|
if (acpi_ns_opens_scope(type)) { |
|
status = |
|
acpi_ds_scope_stack_push(this_node, type, |
|
walk_state); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
} |
|
} |
|
#ifdef ACPI_EXEC_APP |
|
if (flags & ACPI_NS_EARLY_INIT) { |
|
this_node->flags |= ANOBJ_NODE_EARLY_INIT; |
|
} |
|
#endif |
|
|
|
*return_node = this_node; |
|
return_ACPI_STATUS(AE_OK); |
|
}
|
|
|