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62 |
marcus.erl |
/*******************************************************************************
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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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* Copyright (C) 2000 - 2007, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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| 45 |
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#include <acpi/amlcode.h>
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| 46 |
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#include <acpi/acnamesp.h>
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| 47 |
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#include <acpi/acdispat.h>
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| 48 |
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| 49 |
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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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* FUNCTION: acpi_ns_root_initialize
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| 55 |
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*
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* PARAMETERS: None
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| 57 |
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*
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* RETURN: Status
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| 59 |
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*
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* DESCRIPTION: Allocate and initialize the default root named objects
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| 61 |
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*
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| 62 |
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* MUTEX: Locks namespace for entire execution
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| 63 |
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*
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| 64 |
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******************************************************************************/
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| 65 |
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acpi_status acpi_ns_root_initialize(void)
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| 66 |
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{
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| 67 |
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acpi_status status;
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| 68 |
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const struct acpi_predefined_names *init_val = NULL;
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| 69 |
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struct acpi_namespace_node *new_node;
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| 70 |
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union acpi_operand_object *obj_desc;
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| 71 |
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acpi_string val = NULL;
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| 73 |
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ACPI_FUNCTION_TRACE(ns_root_initialize);
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| 74 |
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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| 76 |
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if (ACPI_FAILURE(status)) {
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| 77 |
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return_ACPI_STATUS(status);
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| 78 |
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}
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| 79 |
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| 80 |
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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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| 84 |
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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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| 87 |
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}
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| 88 |
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| 89 |
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/*
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| 90 |
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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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| 93 |
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acpi_gbl_root_node = &acpi_gbl_root_node_struct;
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| 94 |
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| 95 |
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/* Enter the pre-defined names in the name table */
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| 96 |
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| 97 |
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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| 98 |
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"Entering predefined entries into namespace\n"));
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| 99 |
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| 100 |
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for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
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| 101 |
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| 102 |
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/* _OSI is optional for now, will be permanent later */
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| 103 |
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| 104 |
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if (!ACPI_STRCMP(init_val->name, "_OSI")
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| 105 |
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&& !acpi_gbl_create_osi_method) {
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| 106 |
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continue;
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| 107 |
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}
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| 108 |
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| 109 |
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status = acpi_ns_lookup(NULL, init_val->name, init_val->type,
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| 110 |
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ACPI_IMODE_LOAD_PASS2,
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| 111 |
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ACPI_NS_NO_UPSEARCH, NULL, &new_node);
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| 112 |
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| 113 |
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if (ACPI_FAILURE(status) || (!new_node)) { /* Must be on same line for code converter */
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| 114 |
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ACPI_EXCEPTION((AE_INFO, status,
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| 115 |
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"Could not create predefined name %s",
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| 116 |
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init_val->name));
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| 117 |
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}
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| 118 |
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| 119 |
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/*
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* Name entered successfully.
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* If entry in pre_defined_names[] specifies an
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* initial value, create the initial value.
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*/
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| 124 |
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if (init_val->val) {
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status = acpi_os_predefined_override(init_val, &val);
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| 126 |
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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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| 129 |
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init_val->name));
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| 130 |
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}
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| 131 |
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| 132 |
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if (!val) {
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| 133 |
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val = init_val->val;
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| 134 |
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}
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| 135 |
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| 136 |
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/*
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| 137 |
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* Entry requests an initial value, allocate a
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| 138 |
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* descriptor for it.
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| 139 |
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*/
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| 140 |
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obj_desc =
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| 141 |
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acpi_ut_create_internal_object(init_val->type);
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| 142 |
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if (!obj_desc) {
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status = AE_NO_MEMORY;
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| 144 |
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goto unlock_and_exit;
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| 145 |
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}
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| 146 |
|
|
|
| 147 |
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/*
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| 148 |
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* Convert value string from table entry to
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| 149 |
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* internal representation. Only types actually
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| 150 |
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* used for initial values are implemented here.
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| 151 |
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*/
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| 152 |
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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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| 158 |
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#if defined (ACPI_ASL_COMPILER)
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| 159 |
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| 160 |
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/* Save the parameter count for the i_aSL 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 */
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| 166 |
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obj_desc->method.method_flags =
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AML_METHOD_INTERNAL_ONLY;
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| 168 |
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| 169 |
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#ifndef ACPI_DUMP_APP
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obj_desc->method.implementation =
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acpi_ut_osi_implementation;
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#endif
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#endif
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| 174 |
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break;
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| 175 |
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| 176 |
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case ACPI_TYPE_INTEGER:
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| 178 |
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obj_desc->integer.value = ACPI_TO_INTEGER(val);
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| 179 |
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break;
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| 180 |
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| 181 |
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case ACPI_TYPE_STRING:
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| 182 |
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| 183 |
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/*
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| 184 |
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* Build an object around the static string
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| 185 |
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*/
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| 186 |
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obj_desc->string.length =
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| 187 |
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(u32) ACPI_STRLEN(val);
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| 188 |
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obj_desc->string.pointer = val;
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| 189 |
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obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
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| 190 |
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break;
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| 191 |
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|
|
| 192 |
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case ACPI_TYPE_MUTEX:
|
| 193 |
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|
|
| 194 |
|
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obj_desc->mutex.node = new_node;
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| 195 |
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obj_desc->mutex.sync_level =
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| 196 |
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(u8) (ACPI_TO_INTEGER(val) - 1);
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| 197 |
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|
|
| 198 |
|
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/* Create a mutex */
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| 199 |
|
|
|
| 200 |
|
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status =
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| 201 |
|
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acpi_os_create_mutex(&obj_desc->mutex.
|
| 202 |
|
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os_mutex);
|
| 203 |
|
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if (ACPI_FAILURE(status)) {
|
| 204 |
|
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acpi_ut_remove_reference(obj_desc);
|
| 205 |
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goto unlock_and_exit;
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| 206 |
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}
|
| 207 |
|
|
|
| 208 |
|
|
/* Special case for ACPI Global Lock */
|
| 209 |
|
|
|
| 210 |
|
|
if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
|
| 211 |
|
|
acpi_gbl_global_lock_mutex =
|
| 212 |
|
|
obj_desc->mutex.os_mutex;
|
| 213 |
|
|
|
| 214 |
|
|
/* Create additional counting semaphore for global lock */
|
| 215 |
|
|
|
| 216 |
|
|
status =
|
| 217 |
|
|
acpi_os_create_semaphore(1, 0,
|
| 218 |
|
|
&acpi_gbl_global_lock_semaphore);
|
| 219 |
|
|
if (ACPI_FAILURE(status)) {
|
| 220 |
|
|
acpi_ut_remove_reference
|
| 221 |
|
|
(obj_desc);
|
| 222 |
|
|
goto unlock_and_exit;
|
| 223 |
|
|
}
|
| 224 |
|
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}
|
| 225 |
|
|
break;
|
| 226 |
|
|
|
| 227 |
|
|
default:
|
| 228 |
|
|
|
| 229 |
|
|
ACPI_ERROR((AE_INFO,
|
| 230 |
|
|
"Unsupported initial type value %X",
|
| 231 |
|
|
init_val->type));
|
| 232 |
|
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acpi_ut_remove_reference(obj_desc);
|
| 233 |
|
|
obj_desc = NULL;
|
| 234 |
|
|
continue;
|
| 235 |
|
|
}
|
| 236 |
|
|
|
| 237 |
|
|
/* Store pointer to value descriptor in the Node */
|
| 238 |
|
|
|
| 239 |
|
|
status = acpi_ns_attach_object(new_node, obj_desc,
|
| 240 |
|
|
ACPI_GET_OBJECT_TYPE
|
| 241 |
|
|
(obj_desc));
|
| 242 |
|
|
|
| 243 |
|
|
/* Remove local reference to the object */
|
| 244 |
|
|
|
| 245 |
|
|
acpi_ut_remove_reference(obj_desc);
|
| 246 |
|
|
}
|
| 247 |
|
|
}
|
| 248 |
|
|
|
| 249 |
|
|
unlock_and_exit:
|
| 250 |
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
| 251 |
|
|
|
| 252 |
|
|
/* Save a handle to "_GPE", it is always present */
|
| 253 |
|
|
|
| 254 |
|
|
if (ACPI_SUCCESS(status)) {
|
| 255 |
|
|
status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
|
| 256 |
|
|
&acpi_gbl_fadt_gpe_device);
|
| 257 |
|
|
}
|
| 258 |
|
|
|
| 259 |
|
|
return_ACPI_STATUS(status);
|
| 260 |
|
|
}
|
| 261 |
|
|
|
| 262 |
|
|
/*******************************************************************************
|
| 263 |
|
|
*
|
| 264 |
|
|
* FUNCTION: acpi_ns_lookup
|
| 265 |
|
|
*
|
| 266 |
|
|
* PARAMETERS: scope_info - Current scope info block
|
| 267 |
|
|
* Pathname - Search pathname, in internal format
|
| 268 |
|
|
* (as represented in the AML stream)
|
| 269 |
|
|
* Type - Type associated with name
|
| 270 |
|
|
* interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
|
| 271 |
|
|
* Flags - Flags describing the search restrictions
|
| 272 |
|
|
* walk_state - Current state of the walk
|
| 273 |
|
|
* return_node - Where the Node is placed (if found
|
| 274 |
|
|
* or created successfully)
|
| 275 |
|
|
*
|
| 276 |
|
|
* RETURN: Status
|
| 277 |
|
|
*
|
| 278 |
|
|
* DESCRIPTION: Find or enter the passed name in the name space.
|
| 279 |
|
|
* Log an error if name not found in Exec mode.
|
| 280 |
|
|
*
|
| 281 |
|
|
* MUTEX: Assumes namespace is locked.
|
| 282 |
|
|
*
|
| 283 |
|
|
******************************************************************************/
|
| 284 |
|
|
|
| 285 |
|
|
acpi_status
|
| 286 |
|
|
acpi_ns_lookup(union acpi_generic_state *scope_info,
|
| 287 |
|
|
char *pathname,
|
| 288 |
|
|
acpi_object_type type,
|
| 289 |
|
|
acpi_interpreter_mode interpreter_mode,
|
| 290 |
|
|
u32 flags,
|
| 291 |
|
|
struct acpi_walk_state *walk_state,
|
| 292 |
|
|
struct acpi_namespace_node **return_node)
|
| 293 |
|
|
{
|
| 294 |
|
|
acpi_status status;
|
| 295 |
|
|
char *path = pathname;
|
| 296 |
|
|
struct acpi_namespace_node *prefix_node;
|
| 297 |
|
|
struct acpi_namespace_node *current_node = NULL;
|
| 298 |
|
|
struct acpi_namespace_node *this_node = NULL;
|
| 299 |
|
|
u32 num_segments;
|
| 300 |
|
|
u32 num_carats;
|
| 301 |
|
|
acpi_name simple_name;
|
| 302 |
|
|
acpi_object_type type_to_check_for;
|
| 303 |
|
|
acpi_object_type this_search_type;
|
| 304 |
|
|
u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
|
| 305 |
|
|
u32 local_flags;
|
| 306 |
|
|
|
| 307 |
|
|
ACPI_FUNCTION_TRACE(ns_lookup);
|
| 308 |
|
|
|
| 309 |
|
|
if (!return_node) {
|
| 310 |
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
| 311 |
|
|
}
|
| 312 |
|
|
|
| 313 |
|
|
local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT);
|
| 314 |
|
|
*return_node = ACPI_ENTRY_NOT_FOUND;
|
| 315 |
|
|
acpi_gbl_ns_lookup_count++;
|
| 316 |
|
|
|
| 317 |
|
|
if (!acpi_gbl_root_node) {
|
| 318 |
|
|
return_ACPI_STATUS(AE_NO_NAMESPACE);
|
| 319 |
|
|
}
|
| 320 |
|
|
|
| 321 |
|
|
/*
|
| 322 |
|
|
* Get the prefix scope.
|
| 323 |
|
|
* A null scope means use the root scope
|
| 324 |
|
|
*/
|
| 325 |
|
|
if ((!scope_info) || (!scope_info->scope.node)) {
|
| 326 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 327 |
|
|
"Null scope prefix, using root node (%p)\n",
|
| 328 |
|
|
acpi_gbl_root_node));
|
| 329 |
|
|
|
| 330 |
|
|
prefix_node = acpi_gbl_root_node;
|
| 331 |
|
|
} else {
|
| 332 |
|
|
prefix_node = scope_info->scope.node;
|
| 333 |
|
|
if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
|
| 334 |
|
|
ACPI_DESC_TYPE_NAMED) {
|
| 335 |
|
|
ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
|
| 336 |
|
|
prefix_node,
|
| 337 |
|
|
acpi_ut_get_descriptor_name(prefix_node)));
|
| 338 |
|
|
return_ACPI_STATUS(AE_AML_INTERNAL);
|
| 339 |
|
|
}
|
| 340 |
|
|
|
| 341 |
|
|
if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
|
| 342 |
|
|
/*
|
| 343 |
|
|
* This node might not be a actual "scope" node (such as a
|
| 344 |
|
|
* Device/Method, etc.) It could be a Package or other object node.
|
| 345 |
|
|
* Backup up the tree to find the containing scope node.
|
| 346 |
|
|
*/
|
| 347 |
|
|
while (!acpi_ns_opens_scope(prefix_node->type) &&
|
| 348 |
|
|
prefix_node->type != ACPI_TYPE_ANY) {
|
| 349 |
|
|
prefix_node =
|
| 350 |
|
|
acpi_ns_get_parent_node(prefix_node);
|
| 351 |
|
|
}
|
| 352 |
|
|
}
|
| 353 |
|
|
}
|
| 354 |
|
|
|
| 355 |
|
|
/* Save type TBD: may be no longer necessary */
|
| 356 |
|
|
|
| 357 |
|
|
type_to_check_for = type;
|
| 358 |
|
|
|
| 359 |
|
|
/*
|
| 360 |
|
|
* Begin examination of the actual pathname
|
| 361 |
|
|
*/
|
| 362 |
|
|
if (!pathname) {
|
| 363 |
|
|
|
| 364 |
|
|
/* A Null name_path is allowed and refers to the root */
|
| 365 |
|
|
|
| 366 |
|
|
num_segments = 0;
|
| 367 |
|
|
this_node = acpi_gbl_root_node;
|
| 368 |
|
|
path = "";
|
| 369 |
|
|
|
| 370 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 371 |
|
|
"Null Pathname (Zero segments), Flags=%X\n",
|
| 372 |
|
|
flags));
|
| 373 |
|
|
} else {
|
| 374 |
|
|
/*
|
| 375 |
|
|
* Name pointer is valid (and must be in internal name format)
|
| 376 |
|
|
*
|
| 377 |
|
|
* Check for scope prefixes:
|
| 378 |
|
|
*
|
| 379 |
|
|
* As represented in the AML stream, a namepath consists of an
|
| 380 |
|
|
* optional scope prefix followed by a name segment part.
|
| 381 |
|
|
*
|
| 382 |
|
|
* If present, the scope prefix is either a Root Prefix (in
|
| 383 |
|
|
* which case the name is fully qualified), or one or more
|
| 384 |
|
|
* Parent Prefixes (in which case the name's scope is relative
|
| 385 |
|
|
* to the current scope).
|
| 386 |
|
|
*/
|
| 387 |
|
|
if (*path == (u8) AML_ROOT_PREFIX) {
|
| 388 |
|
|
|
| 389 |
|
|
/* Pathname is fully qualified, start from the root */
|
| 390 |
|
|
|
| 391 |
|
|
this_node = acpi_gbl_root_node;
|
| 392 |
|
|
search_parent_flag = ACPI_NS_NO_UPSEARCH;
|
| 393 |
|
|
|
| 394 |
|
|
/* Point to name segment part */
|
| 395 |
|
|
|
| 396 |
|
|
path++;
|
| 397 |
|
|
|
| 398 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 399 |
|
|
"Path is absolute from root [%p]\n",
|
| 400 |
|
|
this_node));
|
| 401 |
|
|
} else {
|
| 402 |
|
|
/* Pathname is relative to current scope, start there */
|
| 403 |
|
|
|
| 404 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 405 |
|
|
"Searching relative to prefix scope [%4.4s] (%p)\n",
|
| 406 |
|
|
acpi_ut_get_node_name(prefix_node),
|
| 407 |
|
|
prefix_node));
|
| 408 |
|
|
|
| 409 |
|
|
/*
|
| 410 |
|
|
* Handle multiple Parent Prefixes (carat) by just getting
|
| 411 |
|
|
* the parent node for each prefix instance.
|
| 412 |
|
|
*/
|
| 413 |
|
|
this_node = prefix_node;
|
| 414 |
|
|
num_carats = 0;
|
| 415 |
|
|
while (*path == (u8) AML_PARENT_PREFIX) {
|
| 416 |
|
|
|
| 417 |
|
|
/* Name is fully qualified, no search rules apply */
|
| 418 |
|
|
|
| 419 |
|
|
search_parent_flag = ACPI_NS_NO_UPSEARCH;
|
| 420 |
|
|
/*
|
| 421 |
|
|
* Point past this prefix to the name segment
|
| 422 |
|
|
* part or the next Parent Prefix
|
| 423 |
|
|
*/
|
| 424 |
|
|
path++;
|
| 425 |
|
|
|
| 426 |
|
|
/* Backup to the parent node */
|
| 427 |
|
|
|
| 428 |
|
|
num_carats++;
|
| 429 |
|
|
this_node = acpi_ns_get_parent_node(this_node);
|
| 430 |
|
|
if (!this_node) {
|
| 431 |
|
|
|
| 432 |
|
|
/* Current scope has no parent scope */
|
| 433 |
|
|
|
| 434 |
|
|
ACPI_ERROR((AE_INFO,
|
| 435 |
|
|
"ACPI path has too many parent prefixes (^) - reached beyond root node"));
|
| 436 |
|
|
return_ACPI_STATUS(AE_NOT_FOUND);
|
| 437 |
|
|
}
|
| 438 |
|
|
}
|
| 439 |
|
|
|
| 440 |
|
|
if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
|
| 441 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 442 |
|
|
"Search scope is [%4.4s], path has %d carat(s)\n",
|
| 443 |
|
|
acpi_ut_get_node_name
|
| 444 |
|
|
(this_node), num_carats));
|
| 445 |
|
|
}
|
| 446 |
|
|
}
|
| 447 |
|
|
|
| 448 |
|
|
/*
|
| 449 |
|
|
* Determine the number of ACPI name segments in this pathname.
|
| 450 |
|
|
*
|
| 451 |
|
|
* The segment part consists of either:
|
| 452 |
|
|
* - A Null name segment (0)
|
| 453 |
|
|
* - A dual_name_prefix followed by two 4-byte name segments
|
| 454 |
|
|
* - A multi_name_prefix followed by a byte indicating the
|
| 455 |
|
|
* number of segments and the segments themselves.
|
| 456 |
|
|
* - A single 4-byte name segment
|
| 457 |
|
|
*
|
| 458 |
|
|
* Examine the name prefix opcode, if any, to determine the number of
|
| 459 |
|
|
* segments.
|
| 460 |
|
|
*/
|
| 461 |
|
|
switch (*path) {
|
| 462 |
|
|
case 0:
|
| 463 |
|
|
/*
|
| 464 |
|
|
* Null name after a root or parent prefixes. We already
|
| 465 |
|
|
* have the correct target node and there are no name segments.
|
| 466 |
|
|
*/
|
| 467 |
|
|
num_segments = 0;
|
| 468 |
|
|
type = this_node->type;
|
| 469 |
|
|
|
| 470 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 471 |
|
|
"Prefix-only Pathname (Zero name segments), Flags=%X\n",
|
| 472 |
|
|
flags));
|
| 473 |
|
|
break;
|
| 474 |
|
|
|
| 475 |
|
|
case AML_DUAL_NAME_PREFIX:
|
| 476 |
|
|
|
| 477 |
|
|
/* More than one name_seg, search rules do not apply */
|
| 478 |
|
|
|
| 479 |
|
|
search_parent_flag = ACPI_NS_NO_UPSEARCH;
|
| 480 |
|
|
|
| 481 |
|
|
/* Two segments, point to first name segment */
|
| 482 |
|
|
|
| 483 |
|
|
num_segments = 2;
|
| 484 |
|
|
path++;
|
| 485 |
|
|
|
| 486 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 487 |
|
|
"Dual Pathname (2 segments, Flags=%X)\n",
|
| 488 |
|
|
flags));
|
| 489 |
|
|
break;
|
| 490 |
|
|
|
| 491 |
|
|
case AML_MULTI_NAME_PREFIX_OP:
|
| 492 |
|
|
|
| 493 |
|
|
/* More than one name_seg, search rules do not apply */
|
| 494 |
|
|
|
| 495 |
|
|
search_parent_flag = ACPI_NS_NO_UPSEARCH;
|
| 496 |
|
|
|
| 497 |
|
|
/* Extract segment count, point to first name segment */
|
| 498 |
|
|
|
| 499 |
|
|
path++;
|
| 500 |
|
|
num_segments = (u32) (u8) * path;
|
| 501 |
|
|
path++;
|
| 502 |
|
|
|
| 503 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 504 |
|
|
"Multi Pathname (%d Segments, Flags=%X)\n",
|
| 505 |
|
|
num_segments, flags));
|
| 506 |
|
|
break;
|
| 507 |
|
|
|
| 508 |
|
|
default:
|
| 509 |
|
|
/*
|
| 510 |
|
|
* Not a Null name, no Dual or Multi prefix, hence there is
|
| 511 |
|
|
* only one name segment and Pathname is already pointing to it.
|
| 512 |
|
|
*/
|
| 513 |
|
|
num_segments = 1;
|
| 514 |
|
|
|
| 515 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 516 |
|
|
"Simple Pathname (1 segment, Flags=%X)\n",
|
| 517 |
|
|
flags));
|
| 518 |
|
|
break;
|
| 519 |
|
|
}
|
| 520 |
|
|
|
| 521 |
|
|
ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
|
| 522 |
|
|
}
|
| 523 |
|
|
|
| 524 |
|
|
/*
|
| 525 |
|
|
* Search namespace for each segment of the name. Loop through and
|
| 526 |
|
|
* verify (or add to the namespace) each name segment.
|
| 527 |
|
|
*
|
| 528 |
|
|
* The object type is significant only at the last name
|
| 529 |
|
|
* segment. (We don't care about the types along the path, only
|
| 530 |
|
|
* the type of the final target object.)
|
| 531 |
|
|
*/
|
| 532 |
|
|
this_search_type = ACPI_TYPE_ANY;
|
| 533 |
|
|
current_node = this_node;
|
| 534 |
|
|
while (num_segments && current_node) {
|
| 535 |
|
|
num_segments--;
|
| 536 |
|
|
if (!num_segments) {
|
| 537 |
|
|
/*
|
| 538 |
|
|
* This is the last segment, enable typechecking
|
| 539 |
|
|
*/
|
| 540 |
|
|
this_search_type = type;
|
| 541 |
|
|
|
| 542 |
|
|
/*
|
| 543 |
|
|
* Only allow automatic parent search (search rules) if the caller
|
| 544 |
|
|
* requested it AND we have a single, non-fully-qualified name_seg
|
| 545 |
|
|
*/
|
| 546 |
|
|
if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
|
| 547 |
|
|
(flags & ACPI_NS_SEARCH_PARENT)) {
|
| 548 |
|
|
local_flags |= ACPI_NS_SEARCH_PARENT;
|
| 549 |
|
|
}
|
| 550 |
|
|
|
| 551 |
|
|
/* Set error flag according to caller */
|
| 552 |
|
|
|
| 553 |
|
|
if (flags & ACPI_NS_ERROR_IF_FOUND) {
|
| 554 |
|
|
local_flags |= ACPI_NS_ERROR_IF_FOUND;
|
| 555 |
|
|
}
|
| 556 |
|
|
}
|
| 557 |
|
|
|
| 558 |
|
|
/* Extract one ACPI name from the front of the pathname */
|
| 559 |
|
|
|
| 560 |
|
|
ACPI_MOVE_32_TO_32(&simple_name, path);
|
| 561 |
|
|
|
| 562 |
|
|
/* Try to find the single (4 character) ACPI name */
|
| 563 |
|
|
|
| 564 |
|
|
status =
|
| 565 |
|
|
acpi_ns_search_and_enter(simple_name, walk_state,
|
| 566 |
|
|
current_node, interpreter_mode,
|
| 567 |
|
|
this_search_type, local_flags,
|
| 568 |
|
|
&this_node);
|
| 569 |
|
|
if (ACPI_FAILURE(status)) {
|
| 570 |
|
|
if (status == AE_NOT_FOUND) {
|
| 571 |
|
|
|
| 572 |
|
|
/* Name not found in ACPI namespace */
|
| 573 |
|
|
|
| 574 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
| 575 |
|
|
"Name [%4.4s] not found in scope [%4.4s] %p\n",
|
| 576 |
|
|
(char *)&simple_name,
|
| 577 |
|
|
(char *)¤t_node->name,
|
| 578 |
|
|
current_node));
|
| 579 |
|
|
}
|
| 580 |
|
|
|
| 581 |
|
|
*return_node = this_node;
|
| 582 |
|
|
return_ACPI_STATUS(status);
|
| 583 |
|
|
}
|
| 584 |
|
|
|
| 585 |
|
|
/*
|
| 586 |
|
|
* Sanity typecheck of the target object:
|
| 587 |
|
|
*
|
| 588 |
|
|
* If 1) This is the last segment (num_segments == 0)
|
| 589 |
|
|
* 2) And we are looking for a specific type
|
| 590 |
|
|
* (Not checking for TYPE_ANY)
|
| 591 |
|
|
* 3) Which is not an alias
|
| 592 |
|
|
* 4) Which is not a local type (TYPE_SCOPE)
|
| 593 |
|
|
* 5) And the type of target object is known (not TYPE_ANY)
|
| 594 |
|
|
* 6) And target object does not match what we are looking for
|
| 595 |
|
|
*
|
| 596 |
|
|
* Then we have a type mismatch. Just warn and ignore it.
|
| 597 |
|
|
*/
|
| 598 |
|
|
if ((num_segments == 0) &&
|
| 599 |
|
|
(type_to_check_for != ACPI_TYPE_ANY) &&
|
| 600 |
|
|
(type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
|
| 601 |
|
|
(type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) &&
|
| 602 |
|
|
(type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) &&
|
| 603 |
|
|
(this_node->type != ACPI_TYPE_ANY) &&
|
| 604 |
|
|
(this_node->type != type_to_check_for)) {
|
| 605 |
|
|
|
| 606 |
|
|
/* Complain about a type mismatch */
|
| 607 |
|
|
|
| 608 |
|
|
ACPI_WARNING((AE_INFO,
|
| 609 |
|
|
"NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
|
| 610 |
|
|
ACPI_CAST_PTR(char, &simple_name),
|
| 611 |
|
|
acpi_ut_get_type_name(this_node->type),
|
| 612 |
|
|
acpi_ut_get_type_name
|
| 613 |
|
|
(type_to_check_for)));
|
| 614 |
|
|
}
|
| 615 |
|
|
|
| 616 |
|
|
/*
|
| 617 |
|
|
* If this is the last name segment and we are not looking for a
|
| 618 |
|
|
* specific type, but the type of found object is known, use that type
|
| 619 |
|
|
* to see if it opens a scope.
|
| 620 |
|
|
*/
|
| 621 |
|
|
if ((num_segments == 0) && (type == ACPI_TYPE_ANY)) {
|
| 622 |
|
|
type = this_node->type;
|
| 623 |
|
|
}
|
| 624 |
|
|
|
| 625 |
|
|
/* Point to next name segment and make this node current */
|
| 626 |
|
|
|
| 627 |
|
|
path += ACPI_NAME_SIZE;
|
| 628 |
|
|
current_node = this_node;
|
| 629 |
|
|
}
|
| 630 |
|
|
|
| 631 |
|
|
/*
|
| 632 |
|
|
* Always check if we need to open a new scope
|
| 633 |
|
|
*/
|
| 634 |
|
|
if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
|
| 635 |
|
|
/*
|
| 636 |
|
|
* If entry is a type which opens a scope, push the new scope on the
|
| 637 |
|
|
* scope stack.
|
| 638 |
|
|
*/
|
| 639 |
|
|
if (acpi_ns_opens_scope(type)) {
|
| 640 |
|
|
status =
|
| 641 |
|
|
acpi_ds_scope_stack_push(this_node, type,
|
| 642 |
|
|
walk_state);
|
| 643 |
|
|
if (ACPI_FAILURE(status)) {
|
| 644 |
|
|
return_ACPI_STATUS(status);
|
| 645 |
|
|
}
|
| 646 |
|
|
}
|
| 647 |
|
|
}
|
| 648 |
|
|
|
| 649 |
|
|
*return_node = this_node;
|
| 650 |
|
|
return_ACPI_STATUS(AE_OK);
|
| 651 |
|
|
}
|
