1/******************************************************************************
2 *
3 * Module Name: nsinit - namespace initialization
4 *
5 *****************************************************************************/
6
7/******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 *    notice, this list of conditions, and the following disclaimer,
124 *    without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 *    substantially similar to the "NO WARRANTY" disclaimer below
127 *    ("Disclaimer") and any redistribution must be conditioned upon
128 *    including a substantially similar Disclaimer requirement for further
129 *    binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 *    of any contributors may be used to endorse or promote products derived
132 *    from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152#include "acpi.h"
153#include "accommon.h"
154#include "acnamesp.h"
155#include "acdispat.h"
156#include "acinterp.h"
157#include "acevents.h"
158
159#define _COMPONENT          ACPI_NAMESPACE
160        ACPI_MODULE_NAME    ("nsinit")
161
162/* Local prototypes */
163
164static ACPI_STATUS
165AcpiNsInitOneObject (
166    ACPI_HANDLE             ObjHandle,
167    UINT32                  Level,
168    void                    *Context,
169    void                    **ReturnValue);
170
171static ACPI_STATUS
172AcpiNsInitOneDevice (
173    ACPI_HANDLE             ObjHandle,
174    UINT32                  NestingLevel,
175    void                    *Context,
176    void                    **ReturnValue);
177
178static ACPI_STATUS
179AcpiNsFindIniMethods (
180    ACPI_HANDLE             ObjHandle,
181    UINT32                  NestingLevel,
182    void                    *Context,
183    void                    **ReturnValue);
184
185
186/*******************************************************************************
187 *
188 * FUNCTION:    AcpiNsInitializeObjects
189 *
190 * PARAMETERS:  None
191 *
192 * RETURN:      Status
193 *
194 * DESCRIPTION: Walk the entire namespace and perform any necessary
195 *              initialization on the objects found therein
196 *
197 ******************************************************************************/
198
199ACPI_STATUS
200AcpiNsInitializeObjects (
201    void)
202{
203    ACPI_STATUS             Status;
204    ACPI_INIT_WALK_INFO     Info;
205
206
207    ACPI_FUNCTION_TRACE (NsInitializeObjects);
208
209
210    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
211        "[Init] Completing Initialization of ACPI Objects\n"));
212    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
213        "**** Starting initialization of namespace objects ****\n"));
214    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
215        "Completing Region/Field/Buffer/Package initialization:\n"));
216
217    /* Set all init info to zero */
218
219    memset (&Info, 0, sizeof (ACPI_INIT_WALK_INFO));
220
221    /* Walk entire namespace from the supplied root */
222
223    Status = AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
224        ACPI_UINT32_MAX, AcpiNsInitOneObject, NULL,
225        &Info, NULL);
226    if (ACPI_FAILURE (Status))
227    {
228        ACPI_EXCEPTION ((AE_INFO, Status, "During WalkNamespace"));
229    }
230
231    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
232        "    Initialized %u/%u Regions %u/%u Fields %u/%u "
233        "Buffers %u/%u Packages (%u nodes)\n",
234        Info.OpRegionInit,  Info.OpRegionCount,
235        Info.FieldInit,     Info.FieldCount,
236        Info.BufferInit,    Info.BufferCount,
237        Info.PackageInit,   Info.PackageCount, Info.ObjectCount));
238
239    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
240        "%u Control Methods found\n%u Op Regions found\n",
241        Info.MethodCount, Info.OpRegionCount));
242
243    return_ACPI_STATUS (AE_OK);
244}
245
246
247/*******************************************************************************
248 *
249 * FUNCTION:    AcpiNsInitializeDevices
250 *
251 * PARAMETERS:  None
252 *
253 * RETURN:      ACPI_STATUS
254 *
255 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
256 *              This means running _INI on all present devices.
257 *
258 *              Note: We install PCI config space handler on region access,
259 *              not here.
260 *
261 ******************************************************************************/
262
263ACPI_STATUS
264AcpiNsInitializeDevices (
265    UINT32                  Flags)
266{
267    ACPI_STATUS             Status = AE_OK;
268    ACPI_DEVICE_WALK_INFO   Info;
269    ACPI_HANDLE             Handle;
270
271
272    ACPI_FUNCTION_TRACE (NsInitializeDevices);
273
274
275    if (!(Flags & ACPI_NO_DEVICE_INIT))
276    {
277        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
278            "[Init] Initializing ACPI Devices\n"));
279
280        /* Init counters */
281
282        Info.DeviceCount = 0;
283        Info.Num_STA = 0;
284        Info.Num_INI = 0;
285
286        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
287            "Initializing Device/Processor/Thermal objects "
288            "and executing _INI/_STA methods:\n"));
289
290        /* Tree analysis: find all subtrees that contain _INI methods */
291
292        Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
293            ACPI_UINT32_MAX, FALSE, AcpiNsFindIniMethods, NULL, &Info, NULL);
294        if (ACPI_FAILURE (Status))
295        {
296            goto ErrorExit;
297        }
298
299        /* Allocate the evaluation information block */
300
301        Info.EvaluateInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
302        if (!Info.EvaluateInfo)
303        {
304            Status = AE_NO_MEMORY;
305            goto ErrorExit;
306        }
307
308        /*
309         * Execute the "global" _INI method that may appear at the root.
310         * This support is provided for Windows compatibility (Vista+) and
311         * is not part of the ACPI specification.
312         */
313        Info.EvaluateInfo->PrefixNode = AcpiGbl_RootNode;
314        Info.EvaluateInfo->RelativePathname = METHOD_NAME__INI;
315        Info.EvaluateInfo->Parameters = NULL;
316        Info.EvaluateInfo->Flags = ACPI_IGNORE_RETURN_VALUE;
317
318        Status = AcpiNsEvaluate (Info.EvaluateInfo);
319        if (ACPI_SUCCESS (Status))
320        {
321            Info.Num_INI++;
322        }
323
324        /*
325         * Execute \_SB._INI.
326         * There appears to be a strict order requirement for \_SB._INI,
327         * which should be evaluated before any _REG evaluations.
328         */
329        Status = AcpiGetHandle (NULL, "\\_SB", &Handle);
330        if (ACPI_SUCCESS (Status))
331        {
332            memset (Info.EvaluateInfo, 0, sizeof (ACPI_EVALUATE_INFO));
333            Info.EvaluateInfo->PrefixNode = Handle;
334            Info.EvaluateInfo->RelativePathname = METHOD_NAME__INI;
335            Info.EvaluateInfo->Parameters = NULL;
336            Info.EvaluateInfo->Flags = ACPI_IGNORE_RETURN_VALUE;
337
338            Status = AcpiNsEvaluate (Info.EvaluateInfo);
339            if (ACPI_SUCCESS (Status))
340            {
341                Info.Num_INI++;
342            }
343        }
344    }
345
346    /*
347     * Run all _REG methods
348     *
349     * Note: Any objects accessed by the _REG methods will be automatically
350     * initialized, even if they contain executable AML (see the call to
351     * AcpiNsInitializeObjects below).
352     *
353     * Note: According to the ACPI specification, we actually needn't execute
354     * _REG for SystemMemory/SystemIo operation regions, but for PCI_Config
355     * operation regions, it is required to evaluate _REG for those on a PCI
356     * root bus that doesn't contain _BBN object. So this code is kept here
357     * in order not to break things.
358     */
359    if (!(Flags & ACPI_NO_ADDRESS_SPACE_INIT))
360    {
361        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
362            "[Init] Executing _REG OpRegion methods\n"));
363
364        Status = AcpiEvInitializeOpRegions ();
365        if (ACPI_FAILURE (Status))
366        {
367            goto ErrorExit;
368        }
369    }
370
371    if (!(Flags & ACPI_NO_DEVICE_INIT))
372    {
373        /* Walk namespace to execute all _INIs on present devices */
374
375        Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
376            ACPI_UINT32_MAX, FALSE, AcpiNsInitOneDevice, NULL, &Info, NULL);
377
378        /*
379         * Any _OSI requests should be completed by now. If the BIOS has
380         * requested any Windows OSI strings, we will always truncate
381         * I/O addresses to 16 bits -- for Windows compatibility.
382         */
383        if (AcpiGbl_OsiData >= ACPI_OSI_WIN_2000)
384        {
385            AcpiGbl_TruncateIoAddresses = TRUE;
386        }
387
388        ACPI_FREE (Info.EvaluateInfo);
389        if (ACPI_FAILURE (Status))
390        {
391            goto ErrorExit;
392        }
393
394        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
395            "    Executed %u _INI methods requiring %u _STA executions "
396            "(examined %u objects)\n",
397            Info.Num_INI, Info.Num_STA, Info.DeviceCount));
398    }
399
400    return_ACPI_STATUS (Status);
401
402
403ErrorExit:
404    ACPI_EXCEPTION ((AE_INFO, Status, "During device initialization"));
405    return_ACPI_STATUS (Status);
406}
407
408
409/*******************************************************************************
410 *
411 * FUNCTION:    AcpiNsInitOnePackage
412 *
413 * PARAMETERS:  ObjHandle       - Node
414 *              Level           - Current nesting level
415 *              Context         - Not used
416 *              ReturnValue     - Not used
417 *
418 * RETURN:      Status
419 *
420 * DESCRIPTION: Callback from AcpiWalkNamespace. Invoked for every package
421 *              within the namespace. Used during dynamic load of an SSDT.
422 *
423 ******************************************************************************/
424
425ACPI_STATUS
426AcpiNsInitOnePackage (
427    ACPI_HANDLE             ObjHandle,
428    UINT32                  Level,
429    void                    *Context,
430    void                    **ReturnValue)
431{
432    ACPI_STATUS             Status;
433    ACPI_OPERAND_OBJECT     *ObjDesc;
434    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
435
436
437    ObjDesc = AcpiNsGetAttachedObject (Node);
438    if (!ObjDesc)
439    {
440        return (AE_OK);
441    }
442
443    /* Exit if package is already initialized */
444
445    if (ObjDesc->Package.Flags & AOPOBJ_DATA_VALID)
446    {
447        return (AE_OK);
448    }
449
450    Status = AcpiDsGetPackageArguments (ObjDesc);
451    if (ACPI_FAILURE (Status))
452    {
453        return (AE_OK);
454    }
455
456    Status = AcpiUtWalkPackageTree (ObjDesc, NULL, AcpiDsInitPackageElement,
457        NULL);
458    if (ACPI_FAILURE (Status))
459    {
460        return (AE_OK);
461    }
462
463    ObjDesc->Package.Flags |= AOPOBJ_DATA_VALID;
464    return (AE_OK);
465}
466
467
468/*******************************************************************************
469 *
470 * FUNCTION:    AcpiNsInitOneObject
471 *
472 * PARAMETERS:  ObjHandle       - Node
473 *              Level           - Current nesting level
474 *              Context         - Points to a init info struct
475 *              ReturnValue     - Not used
476 *
477 * RETURN:      Status
478 *
479 * DESCRIPTION: Callback from AcpiWalkNamespace. Invoked for every object
480 *              within the namespace.
481 *
482 *              Currently, the only objects that require initialization are:
483 *              1) Methods
484 *              2) Op Regions
485 *
486 ******************************************************************************/
487
488static ACPI_STATUS
489AcpiNsInitOneObject (
490    ACPI_HANDLE             ObjHandle,
491    UINT32                  Level,
492    void                    *Context,
493    void                    **ReturnValue)
494{
495    ACPI_OBJECT_TYPE        Type;
496    ACPI_STATUS             Status = AE_OK;
497    ACPI_INIT_WALK_INFO     *Info = (ACPI_INIT_WALK_INFO *) Context;
498    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
499    ACPI_OPERAND_OBJECT     *ObjDesc;
500
501
502    ACPI_FUNCTION_NAME (NsInitOneObject);
503
504
505    Info->ObjectCount++;
506
507    /* And even then, we are only interested in a few object types */
508
509    Type = AcpiNsGetType (ObjHandle);
510    ObjDesc = AcpiNsGetAttachedObject (Node);
511    if (!ObjDesc)
512    {
513        return (AE_OK);
514    }
515
516    /* Increment counters for object types we are looking for */
517
518    switch (Type)
519    {
520    case ACPI_TYPE_REGION:
521
522        Info->OpRegionCount++;
523        break;
524
525    case ACPI_TYPE_BUFFER_FIELD:
526
527        Info->FieldCount++;
528        break;
529
530    case ACPI_TYPE_LOCAL_BANK_FIELD:
531
532        Info->FieldCount++;
533        break;
534
535    case ACPI_TYPE_BUFFER:
536
537        Info->BufferCount++;
538        break;
539
540    case ACPI_TYPE_PACKAGE:
541
542        Info->PackageCount++;
543        break;
544
545    default:
546
547        /* No init required, just exit now */
548
549        return (AE_OK);
550    }
551
552    /* If the object is already initialized, nothing else to do */
553
554    if (ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)
555    {
556        return (AE_OK);
557    }
558
559    /* Must lock the interpreter before executing AML code */
560
561    AcpiExEnterInterpreter ();
562
563    /*
564     * Each of these types can contain executable AML code within the
565     * declaration.
566     */
567    switch (Type)
568    {
569    case ACPI_TYPE_REGION:
570
571        Info->OpRegionInit++;
572        Status = AcpiDsGetRegionArguments (ObjDesc);
573        break;
574
575    case ACPI_TYPE_BUFFER_FIELD:
576
577        Info->FieldInit++;
578        Status = AcpiDsGetBufferFieldArguments (ObjDesc);
579        break;
580
581    case ACPI_TYPE_LOCAL_BANK_FIELD:
582
583        Info->FieldInit++;
584        Status = AcpiDsGetBankFieldArguments (ObjDesc);
585        break;
586
587    case ACPI_TYPE_BUFFER:
588
589        Info->BufferInit++;
590        Status = AcpiDsGetBufferArguments (ObjDesc);
591        break;
592
593    case ACPI_TYPE_PACKAGE:
594
595        /* Complete the initialization/resolution of the package object */
596
597        Info->PackageInit++;
598        Status = AcpiNsInitOnePackage (ObjHandle, Level, NULL, NULL);
599        break;
600
601    default:
602
603        /* No other types can get here */
604
605        break;
606    }
607
608    if (ACPI_FAILURE (Status))
609    {
610        ACPI_EXCEPTION ((AE_INFO, Status,
611            "Could not execute arguments for [%4.4s] (%s)",
612            AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Type)));
613    }
614
615    /*
616     * We ignore errors from above, and always return OK, since we don't want
617     * to abort the walk on any single error.
618     */
619    AcpiExExitInterpreter ();
620    return (AE_OK);
621}
622
623
624/*******************************************************************************
625 *
626 * FUNCTION:    AcpiNsFindIniMethods
627 *
628 * PARAMETERS:  ACPI_WALK_CALLBACK
629 *
630 * RETURN:      ACPI_STATUS
631 *
632 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
633 *              device/processor/thermal objects, and marks the entire subtree
634 *              with a SUBTREE_HAS_INI flag. This flag is used during the
635 *              subsequent device initialization walk to avoid entire subtrees
636 *              that do not contain an _INI.
637 *
638 ******************************************************************************/
639
640static ACPI_STATUS
641AcpiNsFindIniMethods (
642    ACPI_HANDLE             ObjHandle,
643    UINT32                  NestingLevel,
644    void                    *Context,
645    void                    **ReturnValue)
646{
647    ACPI_DEVICE_WALK_INFO   *Info = ACPI_CAST_PTR (ACPI_DEVICE_WALK_INFO, Context);
648    ACPI_NAMESPACE_NODE     *Node;
649    ACPI_NAMESPACE_NODE     *ParentNode;
650
651
652    /* Keep count of device/processor/thermal objects */
653
654    Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
655    if ((Node->Type == ACPI_TYPE_DEVICE)    ||
656        (Node->Type == ACPI_TYPE_PROCESSOR) ||
657        (Node->Type == ACPI_TYPE_THERMAL))
658    {
659        Info->DeviceCount++;
660        return (AE_OK);
661    }
662
663    /* We are only looking for methods named _INI */
664
665    if (!ACPI_COMPARE_NAME (Node->Name.Ascii, METHOD_NAME__INI))
666    {
667        return (AE_OK);
668    }
669
670    /*
671     * The only _INI methods that we care about are those that are
672     * present under Device, Processor, and Thermal objects.
673     */
674    ParentNode = Node->Parent;
675    switch (ParentNode->Type)
676    {
677    case ACPI_TYPE_DEVICE:
678    case ACPI_TYPE_PROCESSOR:
679    case ACPI_TYPE_THERMAL:
680
681        /* Mark parent and bubble up the INI present flag to the root */
682
683        while (ParentNode)
684        {
685            ParentNode->Flags |= ANOBJ_SUBTREE_HAS_INI;
686            ParentNode = ParentNode->Parent;
687        }
688        break;
689
690    default:
691
692        break;
693    }
694
695    return (AE_OK);
696}
697
698
699/*******************************************************************************
700 *
701 * FUNCTION:    AcpiNsInitOneDevice
702 *
703 * PARAMETERS:  ACPI_WALK_CALLBACK
704 *
705 * RETURN:      ACPI_STATUS
706 *
707 * DESCRIPTION: This is called once per device soon after ACPI is enabled
708 *              to initialize each device. It determines if the device is
709 *              present, and if so, calls _INI.
710 *
711 ******************************************************************************/
712
713static ACPI_STATUS
714AcpiNsInitOneDevice (
715    ACPI_HANDLE             ObjHandle,
716    UINT32                  NestingLevel,
717    void                    *Context,
718    void                    **ReturnValue)
719{
720    ACPI_DEVICE_WALK_INFO   *WalkInfo = ACPI_CAST_PTR (ACPI_DEVICE_WALK_INFO, Context);
721    ACPI_EVALUATE_INFO      *Info = WalkInfo->EvaluateInfo;
722    UINT32                  Flags;
723    ACPI_STATUS             Status;
724    ACPI_NAMESPACE_NODE     *DeviceNode;
725
726
727    ACPI_FUNCTION_TRACE (NsInitOneDevice);
728
729
730    /* We are interested in Devices, Processors and ThermalZones only */
731
732    DeviceNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
733    if ((DeviceNode->Type != ACPI_TYPE_DEVICE)    &&
734        (DeviceNode->Type != ACPI_TYPE_PROCESSOR) &&
735        (DeviceNode->Type != ACPI_TYPE_THERMAL))
736    {
737        return_ACPI_STATUS (AE_OK);
738    }
739
740    /*
741     * Because of an earlier namespace analysis, all subtrees that contain an
742     * _INI method are tagged.
743     *
744     * If this device subtree does not contain any _INI methods, we
745     * can exit now and stop traversing this entire subtree.
746     */
747    if (!(DeviceNode->Flags & ANOBJ_SUBTREE_HAS_INI))
748    {
749        return_ACPI_STATUS (AE_CTRL_DEPTH);
750    }
751
752    /*
753     * Run _STA to determine if this device is present and functioning. We
754     * must know this information for two important reasons (from ACPI spec):
755     *
756     * 1) We can only run _INI if the device is present.
757     * 2) We must abort the device tree walk on this subtree if the device is
758     *    not present and is not functional (we will not examine the children)
759     *
760     * The _STA method is not required to be present under the device, we
761     * assume the device is present if _STA does not exist.
762     */
763    ACPI_DEBUG_EXEC (AcpiUtDisplayInitPathname (
764        ACPI_TYPE_METHOD, DeviceNode, METHOD_NAME__STA));
765
766    Status = AcpiUtExecute_STA (DeviceNode, &Flags);
767    if (ACPI_FAILURE (Status))
768    {
769        /* Ignore error and move on to next device */
770
771        return_ACPI_STATUS (AE_OK);
772    }
773
774    /*
775     * Flags == -1 means that _STA was not found. In this case, we assume that
776     * the device is both present and functional.
777     *
778     * From the ACPI spec, description of _STA:
779     *
780     * "If a device object (including the processor object) does not have an
781     * _STA object, then OSPM assumes that all of the above bits are set (in
782     * other words, the device is present, ..., and functioning)"
783     */
784    if (Flags != ACPI_UINT32_MAX)
785    {
786        WalkInfo->Num_STA++;
787    }
788
789    /*
790     * Examine the PRESENT and FUNCTIONING status bits
791     *
792     * Note: ACPI spec does not seem to specify behavior for the present but
793     * not functioning case, so we assume functioning if present.
794     */
795    if (!(Flags & ACPI_STA_DEVICE_PRESENT))
796    {
797        /* Device is not present, we must examine the Functioning bit */
798
799        if (Flags & ACPI_STA_DEVICE_FUNCTIONING)
800        {
801            /*
802             * Device is not present but is "functioning". In this case,
803             * we will not run _INI, but we continue to examine the children
804             * of this device.
805             *
806             * From the ACPI spec, description of _STA: (Note - no mention
807             * of whether to run _INI or not on the device in question)
808             *
809             * "_STA may return bit 0 clear (not present) with bit 3 set
810             * (device is functional). This case is used to indicate a valid
811             * device for which no device driver should be loaded (for example,
812             * a bridge device.) Children of this device may be present and
813             * valid. OSPM should continue enumeration below a device whose
814             * _STA returns this bit combination"
815             */
816            return_ACPI_STATUS (AE_OK);
817        }
818        else
819        {
820            /*
821             * Device is not present and is not functioning. We must abort the
822             * walk of this subtree immediately -- don't look at the children
823             * of such a device.
824             *
825             * From the ACPI spec, description of _INI:
826             *
827             * "If the _STA method indicates that the device is not present,
828             * OSPM will not run the _INI and will not examine the children
829             * of the device for _INI methods"
830             */
831            return_ACPI_STATUS (AE_CTRL_DEPTH);
832        }
833    }
834
835    /*
836     * The device is present or is assumed present if no _STA exists.
837     * Run the _INI if it exists (not required to exist)
838     *
839     * Note: We know there is an _INI within this subtree, but it may not be
840     * under this particular device, it may be lower in the branch.
841     */
842    if (!ACPI_COMPARE_NAME (DeviceNode->Name.Ascii, "_SB_") ||
843        DeviceNode->Parent != AcpiGbl_RootNode)
844    {
845        ACPI_DEBUG_EXEC (AcpiUtDisplayInitPathname (
846            ACPI_TYPE_METHOD, DeviceNode, METHOD_NAME__INI));
847
848        memset (Info, 0, sizeof (ACPI_EVALUATE_INFO));
849        Info->PrefixNode = DeviceNode;
850        Info->RelativePathname = METHOD_NAME__INI;
851        Info->Parameters = NULL;
852        Info->Flags = ACPI_IGNORE_RETURN_VALUE;
853
854        Status = AcpiNsEvaluate (Info);
855        if (ACPI_SUCCESS (Status))
856        {
857            WalkInfo->Num_INI++;
858        }
859
860#ifdef ACPI_DEBUG_OUTPUT
861        else if (Status != AE_NOT_FOUND)
862        {
863            /* Ignore error and move on to next device */
864
865            char *ScopeName = AcpiNsGetNormalizedPathname (DeviceNode, TRUE);
866
867            ACPI_EXCEPTION ((AE_INFO, Status, "during %s._INI execution",
868                ScopeName));
869            ACPI_FREE (ScopeName);
870        }
871#endif
872    }
873
874    /* Ignore errors from above */
875
876    Status = AE_OK;
877
878    /*
879     * The _INI method has been run if present; call the Global Initialization
880     * Handler for this device.
881     */
882    if (AcpiGbl_InitHandler)
883    {
884        Status = AcpiGbl_InitHandler (DeviceNode, ACPI_INIT_DEVICE_INI);
885    }
886
887    return_ACPI_STATUS (Status);
888}
889