[PATCH] cfq-iosched: fix crash in do_div()
[linux-2.6.git] / drivers / acpi / executer / exconfig.c
1 /******************************************************************************
2  *
3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2006, R. Byron Moore
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 #include <acpi/acpi.h>
45 #include <acpi/acinterp.h>
46 #include <acpi/amlcode.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acevents.h>
49 #include <acpi/actables.h>
50 #include <acpi/acdispat.h>
51
52 #define _COMPONENT          ACPI_EXECUTER
53 ACPI_MODULE_NAME("exconfig")
54
55 /* Local prototypes */
56 static acpi_status
57 acpi_ex_add_table(struct acpi_table_header *table,
58                   struct acpi_namespace_node *parent_node,
59                   union acpi_operand_object **ddb_handle);
60
61 /*******************************************************************************
62  *
63  * FUNCTION:    acpi_ex_add_table
64  *
65  * PARAMETERS:  Table               - Pointer to raw table
66  *              parent_node         - Where to load the table (scope)
67  *              ddb_handle          - Where to return the table handle.
68  *
69  * RETURN:      Status
70  *
71  * DESCRIPTION: Common function to Install and Load an ACPI table with a
72  *              returned table handle.
73  *
74  ******************************************************************************/
75
76 static acpi_status
77 acpi_ex_add_table(struct acpi_table_header *table,
78                   struct acpi_namespace_node *parent_node,
79                   union acpi_operand_object **ddb_handle)
80 {
81         acpi_status status;
82         struct acpi_table_desc table_info;
83         union acpi_operand_object *obj_desc;
84
85         ACPI_FUNCTION_TRACE("ex_add_table");
86
87         /* Create an object to be the table handle */
88
89         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
90         if (!obj_desc) {
91                 return_ACPI_STATUS(AE_NO_MEMORY);
92         }
93
94         /* Init the table handle */
95
96         obj_desc->reference.opcode = AML_LOAD_OP;
97         *ddb_handle = obj_desc;
98
99         /* Install the new table into the local data structures */
100
101         ACPI_MEMSET(&table_info, 0, sizeof(struct acpi_table_desc));
102
103         table_info.type = ACPI_TABLE_SSDT;
104         table_info.pointer = table;
105         table_info.length = (acpi_size) table->length;
106         table_info.allocation = ACPI_MEM_ALLOCATED;
107
108         status = acpi_tb_install_table(&table_info);
109         obj_desc->reference.object = table_info.installed_desc;
110
111         if (ACPI_FAILURE(status)) {
112                 if (status == AE_ALREADY_EXISTS) {
113                         /* Table already exists, just return the handle */
114
115                         return_ACPI_STATUS(AE_OK);
116                 }
117                 goto cleanup;
118         }
119
120         /* Add the table to the namespace */
121
122         status = acpi_ns_load_table(table_info.installed_desc, parent_node);
123         if (ACPI_FAILURE(status)) {
124                 /* Uninstall table on error */
125
126                 (void)acpi_tb_uninstall_table(table_info.installed_desc);
127                 goto cleanup;
128         }
129
130         return_ACPI_STATUS(AE_OK);
131
132       cleanup:
133         acpi_ut_remove_reference(obj_desc);
134         *ddb_handle = NULL;
135         return_ACPI_STATUS(status);
136 }
137
138 /*******************************************************************************
139  *
140  * FUNCTION:    acpi_ex_load_table_op
141  *
142  * PARAMETERS:  walk_state          - Current state with operands
143  *              return_desc         - Where to store the return object
144  *
145  * RETURN:      Status
146  *
147  * DESCRIPTION: Load an ACPI table
148  *
149  ******************************************************************************/
150
151 acpi_status
152 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
153                       union acpi_operand_object **return_desc)
154 {
155         acpi_status status;
156         union acpi_operand_object **operand = &walk_state->operands[0];
157         struct acpi_table_header *table;
158         struct acpi_namespace_node *parent_node;
159         struct acpi_namespace_node *start_node;
160         struct acpi_namespace_node *parameter_node = NULL;
161         union acpi_operand_object *ddb_handle;
162
163         ACPI_FUNCTION_TRACE("ex_load_table_op");
164
165 #if 0
166         /*
167          * Make sure that the signature does not match one of the tables that
168          * is already loaded.
169          */
170         status = acpi_tb_match_signature(operand[0]->string.pointer, NULL);
171         if (status == AE_OK) {
172                 /* Signature matched -- don't allow override */
173
174                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
175         }
176 #endif
177
178         /* Find the ACPI table */
179
180         status = acpi_tb_find_table(operand[0]->string.pointer,
181                                     operand[1]->string.pointer,
182                                     operand[2]->string.pointer, &table);
183         if (ACPI_FAILURE(status)) {
184                 if (status != AE_NOT_FOUND) {
185                         return_ACPI_STATUS(status);
186                 }
187
188                 /* Table not found, return an Integer=0 and AE_OK */
189
190                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
191                 if (!ddb_handle) {
192                         return_ACPI_STATUS(AE_NO_MEMORY);
193                 }
194
195                 ddb_handle->integer.value = 0;
196                 *return_desc = ddb_handle;
197
198                 return_ACPI_STATUS(AE_OK);
199         }
200
201         /* Default nodes */
202
203         start_node = walk_state->scope_info->scope.node;
204         parent_node = acpi_gbl_root_node;
205
206         /* root_path (optional parameter) */
207
208         if (operand[3]->string.length > 0) {
209                 /*
210                  * Find the node referenced by the root_path_string. This is the
211                  * location within the namespace where the table will be loaded.
212                  */
213                 status =
214                     acpi_ns_get_node_by_path(operand[3]->string.pointer,
215                                              start_node, ACPI_NS_SEARCH_PARENT,
216                                              &parent_node);
217                 if (ACPI_FAILURE(status)) {
218                         return_ACPI_STATUS(status);
219                 }
220         }
221
222         /* parameter_path (optional parameter) */
223
224         if (operand[4]->string.length > 0) {
225                 if ((operand[4]->string.pointer[0] != '\\') &&
226                     (operand[4]->string.pointer[0] != '^')) {
227                         /*
228                          * Path is not absolute, so it will be relative to the node
229                          * referenced by the root_path_string (or the NS root if omitted)
230                          */
231                         start_node = parent_node;
232                 }
233
234                 /* Find the node referenced by the parameter_path_string */
235
236                 status =
237                     acpi_ns_get_node_by_path(operand[4]->string.pointer,
238                                              start_node, ACPI_NS_SEARCH_PARENT,
239                                              &parameter_node);
240                 if (ACPI_FAILURE(status)) {
241                         return_ACPI_STATUS(status);
242                 }
243         }
244
245         /* Load the table into the namespace */
246
247         status = acpi_ex_add_table(table, parent_node, &ddb_handle);
248         if (ACPI_FAILURE(status)) {
249                 return_ACPI_STATUS(status);
250         }
251
252         /* Parameter Data (optional) */
253
254         if (parameter_node) {
255                 /* Store the parameter data into the optional parameter object */
256
257                 status = acpi_ex_store(operand[5],
258                                        ACPI_CAST_PTR(union acpi_operand_object,
259                                                      parameter_node),
260                                        walk_state);
261                 if (ACPI_FAILURE(status)) {
262                         (void)acpi_ex_unload_table(ddb_handle);
263                         return_ACPI_STATUS(status);
264                 }
265         }
266
267         *return_desc = ddb_handle;
268         return_ACPI_STATUS(status);
269 }
270
271 /*******************************************************************************
272  *
273  * FUNCTION:    acpi_ex_load_op
274  *
275  * PARAMETERS:  obj_desc        - Region or Field where the table will be
276  *                                obtained
277  *              Target          - Where a handle to the table will be stored
278  *              walk_state      - Current state
279  *
280  * RETURN:      Status
281  *
282  * DESCRIPTION: Load an ACPI table from a field or operation region
283  *
284  ******************************************************************************/
285
286 acpi_status
287 acpi_ex_load_op(union acpi_operand_object *obj_desc,
288                 union acpi_operand_object *target,
289                 struct acpi_walk_state *walk_state)
290 {
291         acpi_status status;
292         union acpi_operand_object *ddb_handle;
293         union acpi_operand_object *buffer_desc = NULL;
294         struct acpi_table_header *table_ptr = NULL;
295         acpi_physical_address address;
296         struct acpi_table_header table_header;
297         u32 i;
298
299         ACPI_FUNCTION_TRACE("ex_load_op");
300
301         /* Object can be either an op_region or a Field */
302
303         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
304         case ACPI_TYPE_REGION:
305
306                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
307                                   obj_desc,
308                                   acpi_ut_get_object_type_name(obj_desc)));
309
310                 /*
311                  * If the Region Address and Length have not been previously evaluated,
312                  * evaluate them now and save the results.
313                  */
314                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
315                         status = acpi_ds_get_region_arguments(obj_desc);
316                         if (ACPI_FAILURE(status)) {
317                                 return_ACPI_STATUS(status);
318                         }
319                 }
320
321                 /* Get the base physical address of the region */
322
323                 address = obj_desc->region.address;
324
325                 /* Get the table length from the table header */
326
327                 table_header.length = 0;
328                 for (i = 0; i < 8; i++) {
329                         status =
330                             acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
331                                                            (acpi_physical_address)
332                                                            (i + address), 8,
333                                                            ((u8 *) &
334                                                             table_header) + i);
335                         if (ACPI_FAILURE(status)) {
336                                 return_ACPI_STATUS(status);
337                         }
338                 }
339
340                 /* Sanity check the table length */
341
342                 if (table_header.length < sizeof(struct acpi_table_header)) {
343                         return_ACPI_STATUS(AE_BAD_HEADER);
344                 }
345
346                 /* Allocate a buffer for the entire table */
347
348                 table_ptr = ACPI_MEM_ALLOCATE(table_header.length);
349                 if (!table_ptr) {
350                         return_ACPI_STATUS(AE_NO_MEMORY);
351                 }
352
353                 /* Get the entire table from the op region */
354
355                 for (i = 0; i < table_header.length; i++) {
356                         status =
357                             acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
358                                                            (acpi_physical_address)
359                                                            (i + address), 8,
360                                                            ((u8 *) table_ptr +
361                                                             i));
362                         if (ACPI_FAILURE(status)) {
363                                 goto cleanup;
364                         }
365                 }
366                 break;
367
368         case ACPI_TYPE_LOCAL_REGION_FIELD:
369         case ACPI_TYPE_LOCAL_BANK_FIELD:
370         case ACPI_TYPE_LOCAL_INDEX_FIELD:
371
372                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Field %p %s\n",
373                                   obj_desc,
374                                   acpi_ut_get_object_type_name(obj_desc)));
375
376                 /*
377                  * The length of the field must be at least as large as the table.
378                  * Read the entire field and thus the entire table.  Buffer is
379                  * allocated during the read.
380                  */
381                 status =
382                     acpi_ex_read_data_from_field(walk_state, obj_desc,
383                                                  &buffer_desc);
384                 if (ACPI_FAILURE(status)) {
385                         return_ACPI_STATUS(status);
386                 }
387
388                 table_ptr = ACPI_CAST_PTR(struct acpi_table_header,
389                                           buffer_desc->buffer.pointer);
390
391                 /* All done with the buffer_desc, delete it */
392
393                 buffer_desc->buffer.pointer = NULL;
394                 acpi_ut_remove_reference(buffer_desc);
395
396                 /* Sanity check the table length */
397
398                 if (table_ptr->length < sizeof(struct acpi_table_header)) {
399                         status = AE_BAD_HEADER;
400                         goto cleanup;
401                 }
402                 break;
403
404         default:
405                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
406         }
407
408         /* The table must be either an SSDT or a PSDT */
409
410         if ((!ACPI_STRNCMP(table_ptr->signature,
411                            acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
412                            acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
413             (!ACPI_STRNCMP(table_ptr->signature,
414                            acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
415                            acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
416                 ACPI_ERROR((AE_INFO,
417                             "Table has invalid signature [%4.4s], must be SSDT or PSDT",
418                             table_ptr->signature));
419                 status = AE_BAD_SIGNATURE;
420                 goto cleanup;
421         }
422
423         /* Install the new table into the local data structures */
424
425         status = acpi_ex_add_table(table_ptr, acpi_gbl_root_node, &ddb_handle);
426         if (ACPI_FAILURE(status)) {
427                 /* On error, table_ptr was deallocated above */
428
429                 return_ACPI_STATUS(status);
430         }
431
432         /* Store the ddb_handle into the Target operand */
433
434         status = acpi_ex_store(ddb_handle, target, walk_state);
435         if (ACPI_FAILURE(status)) {
436                 (void)acpi_ex_unload_table(ddb_handle);
437
438                 /* table_ptr was deallocated above */
439
440                 return_ACPI_STATUS(status);
441         }
442
443       cleanup:
444         if (ACPI_FAILURE(status)) {
445                 ACPI_MEM_FREE(table_ptr);
446         }
447         return_ACPI_STATUS(status);
448 }
449
450 /*******************************************************************************
451  *
452  * FUNCTION:    acpi_ex_unload_table
453  *
454  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
455  *
456  * RETURN:      Status
457  *
458  * DESCRIPTION: Unload an ACPI table
459  *
460  ******************************************************************************/
461
462 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
463 {
464         acpi_status status = AE_OK;
465         union acpi_operand_object *table_desc = ddb_handle;
466         struct acpi_table_desc *table_info;
467
468         ACPI_FUNCTION_TRACE("ex_unload_table");
469
470         /*
471          * Validate the handle
472          * Although the handle is partially validated in acpi_ex_reconfiguration(),
473          * when it calls acpi_ex_resolve_operands(), the handle is more completely
474          * validated here.
475          */
476         if ((!ddb_handle) ||
477             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
478             (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
479                 return_ACPI_STATUS(AE_BAD_PARAMETER);
480         }
481
482         /* Get the actual table descriptor from the ddb_handle */
483
484         table_info = (struct acpi_table_desc *)table_desc->reference.object;
485
486         /*
487          * Delete the entire namespace under this table Node
488          * (Offset contains the table_id)
489          */
490         acpi_ns_delete_namespace_by_owner(table_info->owner_id);
491         acpi_ut_release_owner_id(&table_info->owner_id);
492
493         /* Delete the table itself */
494
495         (void)acpi_tb_uninstall_table(table_info->installed_desc);
496
497         /* Delete the table descriptor (ddb_handle) */
498
499         acpi_ut_remove_reference(table_desc);
500         return_ACPI_STATUS(status);
501 }