1/******************************************************************************
2 *
3 * Module Name: tbxfload - Table load/unload external interfaces
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2013, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions, and the following disclaimer,
16 *    without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 *    substantially similar to the "NO WARRANTY" disclaimer below
19 *    ("Disclaimer") and any redistribution must be conditioned upon
20 *    including a substantially similar Disclaimer requirement for further
21 *    binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 *    of any contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#define __TBXFLOAD_C__
45
46#include <contrib/dev/acpica/include/acpi.h>
47#include <contrib/dev/acpica/include/accommon.h>
48#include <contrib/dev/acpica/include/acnamesp.h>
49#include <contrib/dev/acpica/include/actables.h>
50
51#define _COMPONENT          ACPI_TABLES
52        ACPI_MODULE_NAME    ("tbxfload")
53
54/* Local prototypes */
55
56static ACPI_STATUS
57AcpiTbLoadNamespace (
58    void);
59
60
61/*******************************************************************************
62 *
63 * FUNCTION:    AcpiLoadTables
64 *
65 * PARAMETERS:  None
66 *
67 * RETURN:      Status
68 *
69 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
70 *
71 ******************************************************************************/
72
73ACPI_STATUS
74AcpiLoadTables (
75    void)
76{
77    ACPI_STATUS             Status;
78
79
80    ACPI_FUNCTION_TRACE (AcpiLoadTables);
81
82
83    /* Load the namespace from the tables */
84
85    Status = AcpiTbLoadNamespace ();
86    if (ACPI_FAILURE (Status))
87    {
88        ACPI_EXCEPTION ((AE_INFO, Status,
89            "While loading namespace from ACPI tables"));
90    }
91
92    return_ACPI_STATUS (Status);
93}
94
95ACPI_EXPORT_SYMBOL (AcpiLoadTables)
96
97
98/*******************************************************************************
99 *
100 * FUNCTION:    AcpiTbLoadNamespace
101 *
102 * PARAMETERS:  None
103 *
104 * RETURN:      Status
105 *
106 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
107 *              the RSDT/XSDT.
108 *
109 ******************************************************************************/
110
111static ACPI_STATUS
112AcpiTbLoadNamespace (
113    void)
114{
115    ACPI_STATUS             Status;
116    UINT32                  i;
117    ACPI_TABLE_HEADER       *NewDsdt;
118
119
120    ACPI_FUNCTION_TRACE (TbLoadNamespace);
121
122
123    (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
124
125    /*
126     * Load the namespace. The DSDT is required, but any SSDT and
127     * PSDT tables are optional. Verify the DSDT.
128     */
129    if (!AcpiGbl_RootTableList.CurrentTableCount ||
130        !ACPI_COMPARE_NAME (
131            &(AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Signature),
132            ACPI_SIG_DSDT) ||
133         ACPI_FAILURE (AcpiTbVerifyTable (
134            &AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT])))
135    {
136        Status = AE_NO_ACPI_TABLES;
137        goto UnlockAndExit;
138    }
139
140    /*
141     * Save the DSDT pointer for simple access. This is the mapped memory
142     * address. We must take care here because the address of the .Tables
143     * array can change dynamically as tables are loaded at run-time. Note:
144     * .Pointer field is not validated until after call to AcpiTbVerifyTable.
145     */
146    AcpiGbl_DSDT = AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer;
147
148    /*
149     * Optionally copy the entire DSDT to local memory (instead of simply
150     * mapping it.) There are some BIOSs that corrupt or replace the original
151     * DSDT, creating the need for this option. Default is FALSE, do not copy
152     * the DSDT.
153     */
154    if (AcpiGbl_CopyDsdtLocally)
155    {
156        NewDsdt = AcpiTbCopyDsdt (ACPI_TABLE_INDEX_DSDT);
157        if (NewDsdt)
158        {
159            AcpiGbl_DSDT = NewDsdt;
160        }
161    }
162
163    /*
164     * Save the original DSDT header for detection of table corruption
165     * and/or replacement of the DSDT from outside the OS.
166     */
167    ACPI_MEMCPY (&AcpiGbl_OriginalDsdtHeader, AcpiGbl_DSDT,
168        sizeof (ACPI_TABLE_HEADER));
169
170    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
171
172    /* Load and parse tables */
173
174    Status = AcpiNsLoadTable (ACPI_TABLE_INDEX_DSDT, AcpiGbl_RootNode);
175    if (ACPI_FAILURE (Status))
176    {
177        return_ACPI_STATUS (Status);
178    }
179
180    /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
181
182    (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
183    for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
184    {
185        if ((!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
186                    ACPI_SIG_SSDT) &&
187             !ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
188                    ACPI_SIG_PSDT)) ||
189             ACPI_FAILURE (AcpiTbVerifyTable (
190                &AcpiGbl_RootTableList.Tables[i])))
191        {
192            continue;
193        }
194
195        /*
196         * Optionally do not load any SSDTs from the RSDT/XSDT. This can
197         * be useful for debugging ACPI problems on some machines.
198         */
199        if (AcpiGbl_DisableSsdtTableLoad)
200        {
201            ACPI_INFO ((AE_INFO, "Ignoring %4.4s at %p",
202                AcpiGbl_RootTableList.Tables[i].Signature.Ascii,
203                ACPI_CAST_PTR (void, AcpiGbl_RootTableList.Tables[i].Address)));
204            continue;
205        }
206
207        /* Ignore errors while loading tables, get as many as possible */
208
209        (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
210        (void) AcpiNsLoadTable (i, AcpiGbl_RootNode);
211        (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
212    }
213
214    ACPI_INFO ((AE_INFO, "All ACPI Tables successfully acquired"));
215
216UnlockAndExit:
217    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
218    return_ACPI_STATUS (Status);
219}
220
221
222/*******************************************************************************
223 *
224 * FUNCTION:    AcpiLoadTable
225 *
226 * PARAMETERS:  Table               - Pointer to a buffer containing the ACPI
227 *                                    table to be loaded.
228 *
229 * RETURN:      Status
230 *
231 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
232 *              be a valid ACPI table with a valid ACPI table header.
233 *              Note1: Mainly intended to support hotplug addition of SSDTs.
234 *              Note2: Does not copy the incoming table. User is responsible
235 *              to ensure that the table is not deleted or unmapped.
236 *
237 ******************************************************************************/
238
239ACPI_STATUS
240AcpiLoadTable (
241    ACPI_TABLE_HEADER       *Table)
242{
243    ACPI_STATUS             Status;
244    ACPI_TABLE_DESC         TableDesc;
245    UINT32                  TableIndex;
246
247
248    ACPI_FUNCTION_TRACE (AcpiLoadTable);
249
250
251    /* Parameter validation */
252
253    if (!Table)
254    {
255        return_ACPI_STATUS (AE_BAD_PARAMETER);
256    }
257
258    /* Init local table descriptor */
259
260    ACPI_MEMSET (&TableDesc, 0, sizeof (ACPI_TABLE_DESC));
261    TableDesc.Address = ACPI_PTR_TO_PHYSADDR (Table);
262    TableDesc.Pointer = Table;
263    TableDesc.Length = Table->Length;
264    TableDesc.Flags = ACPI_TABLE_ORIGIN_UNKNOWN;
265
266    /* Must acquire the interpreter lock during this operation */
267
268    Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
269    if (ACPI_FAILURE (Status))
270    {
271        return_ACPI_STATUS (Status);
272    }
273
274    /* Install the table and load it into the namespace */
275
276    ACPI_INFO ((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
277    Status = AcpiTbAddTable (&TableDesc, &TableIndex);
278    if (ACPI_FAILURE (Status))
279    {
280        goto UnlockAndExit;
281    }
282
283    Status = AcpiNsLoadTable (TableIndex, AcpiGbl_RootNode);
284
285    /* Invoke table handler if present */
286
287    if (AcpiGbl_TableHandler)
288    {
289        (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, Table,
290                    AcpiGbl_TableHandlerContext);
291    }
292
293UnlockAndExit:
294    (void) AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
295    return_ACPI_STATUS (Status);
296}
297
298ACPI_EXPORT_SYMBOL (AcpiLoadTable)
299
300
301/*******************************************************************************
302 *
303 * FUNCTION:    AcpiUnloadParentTable
304 *
305 * PARAMETERS:  Object              - Handle to any namespace object owned by
306 *                                    the table to be unloaded
307 *
308 * RETURN:      Status
309 *
310 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
311 *              the table and deletes all namespace objects associated with
312 *              that table. Unloading of the DSDT is not allowed.
313 *              Note: Mainly intended to support hotplug removal of SSDTs.
314 *
315 ******************************************************************************/
316
317ACPI_STATUS
318AcpiUnloadParentTable (
319    ACPI_HANDLE             Object)
320{
321    ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Object);
322    ACPI_STATUS             Status = AE_NOT_EXIST;
323    ACPI_OWNER_ID           OwnerId;
324    UINT32                  i;
325
326
327    ACPI_FUNCTION_TRACE (AcpiUnloadParentTable);
328
329
330    /* Parameter validation */
331
332    if (!Object)
333    {
334        return_ACPI_STATUS (AE_BAD_PARAMETER);
335    }
336
337    /*
338     * The node OwnerId is currently the same as the parent table ID.
339     * However, this could change in the future.
340     */
341    OwnerId = Node->OwnerId;
342    if (!OwnerId)
343    {
344        /* OwnerId==0 means DSDT is the owner. DSDT cannot be unloaded */
345
346        return_ACPI_STATUS (AE_TYPE);
347    }
348
349    /* Must acquire the interpreter lock during this operation */
350
351    Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
352    if (ACPI_FAILURE (Status))
353    {
354        return_ACPI_STATUS (Status);
355    }
356
357    /* Find the table in the global table list */
358
359    for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
360    {
361        if (OwnerId != AcpiGbl_RootTableList.Tables[i].OwnerId)
362        {
363            continue;
364        }
365
366        /*
367         * Allow unload of SSDT and OEMx tables only. Do not allow unload
368         * of the DSDT. No other types of tables should get here, since
369         * only these types can contain AML and thus are the only types
370         * that can create namespace objects.
371         */
372        if (ACPI_COMPARE_NAME (
373            AcpiGbl_RootTableList.Tables[i].Signature.Ascii,
374            ACPI_SIG_DSDT))
375        {
376            Status = AE_TYPE;
377            break;
378        }
379
380        /* Ensure the table is actually loaded */
381
382        if (!AcpiTbIsTableLoaded (i))
383        {
384            Status = AE_NOT_EXIST;
385            break;
386        }
387
388        /* Invoke table handler if present */
389
390        if (AcpiGbl_TableHandler)
391        {
392            (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_UNLOAD,
393                        AcpiGbl_RootTableList.Tables[i].Pointer,
394                        AcpiGbl_TableHandlerContext);
395        }
396
397        /*
398         * Delete all namespace objects owned by this table. Note that
399         * these objects can appear anywhere in the namespace by virtue
400         * of the AML "Scope" operator. Thus, we need to track ownership
401         * by an ID, not simply a position within the hierarchy.
402         */
403        Status = AcpiTbDeleteNamespaceByOwner (i);
404        if (ACPI_FAILURE (Status))
405        {
406            break;
407        }
408
409        Status = AcpiTbReleaseOwnerId (i);
410        AcpiTbSetTableLoadedFlag (i, FALSE);
411        break;
412    }
413
414    (void) AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
415    return_ACPI_STATUS (Status);
416}
417
418ACPI_EXPORT_SYMBOL (AcpiUnloadParentTable)
419