1 /*******************************************************************************
2 *
3 * Module Name: utmisc - common utility procedures
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2015, 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 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acnamesp.h"
47
48 #define _COMPONENT ACPI_UTILITIES
49 ACPI_MODULE_NAME("utmisc")
50
51 /*******************************************************************************
52 *
53 * FUNCTION: acpi_ut_is_pci_root_bridge
54 *
55 * PARAMETERS: id - The HID/CID in string format
56 *
57 * RETURN: TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
58 *
59 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
60 *
61 ******************************************************************************/
acpi_ut_is_pci_root_bridge(char * id)62 u8 acpi_ut_is_pci_root_bridge(char *id)
63 {
64
65 /*
66 * Check if this is a PCI root bridge.
67 * ACPI 3.0+: check for a PCI Express root also.
68 */
69 if (!(strcmp(id,
70 PCI_ROOT_HID_STRING)) ||
71 !(strcmp(id, PCI_EXPRESS_ROOT_HID_STRING))) {
72 return (TRUE);
73 }
74
75 return (FALSE);
76 }
77
78 #if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_NAMES_APP)
79 /*******************************************************************************
80 *
81 * FUNCTION: acpi_ut_is_aml_table
82 *
83 * PARAMETERS: table - An ACPI table
84 *
85 * RETURN: TRUE if table contains executable AML; FALSE otherwise
86 *
87 * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
88 * Currently, these are DSDT,SSDT,PSDT. All other table types are
89 * data tables that do not contain AML code.
90 *
91 ******************************************************************************/
92
acpi_ut_is_aml_table(struct acpi_table_header * table)93 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
94 {
95
96 /* These are the only tables that contain executable AML */
97
98 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) ||
99 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_PSDT) ||
100 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT) ||
101 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_OSDT)) {
102 return (TRUE);
103 }
104
105 return (FALSE);
106 }
107 #endif
108
109 /*******************************************************************************
110 *
111 * FUNCTION: acpi_ut_dword_byte_swap
112 *
113 * PARAMETERS: value - Value to be converted
114 *
115 * RETURN: u32 integer with bytes swapped
116 *
117 * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
118 *
119 ******************************************************************************/
120
acpi_ut_dword_byte_swap(u32 value)121 u32 acpi_ut_dword_byte_swap(u32 value)
122 {
123 union {
124 u32 value;
125 u8 bytes[4];
126 } out;
127 union {
128 u32 value;
129 u8 bytes[4];
130 } in;
131
132 ACPI_FUNCTION_ENTRY();
133
134 in.value = value;
135
136 out.bytes[0] = in.bytes[3];
137 out.bytes[1] = in.bytes[2];
138 out.bytes[2] = in.bytes[1];
139 out.bytes[3] = in.bytes[0];
140
141 return (out.value);
142 }
143
144 /*******************************************************************************
145 *
146 * FUNCTION: acpi_ut_set_integer_width
147 *
148 * PARAMETERS: Revision From DSDT header
149 *
150 * RETURN: None
151 *
152 * DESCRIPTION: Set the global integer bit width based upon the revision
153 * of the DSDT. For Revision 1 and 0, Integers are 32 bits.
154 * For Revision 2 and above, Integers are 64 bits. Yes, this
155 * makes a difference.
156 *
157 ******************************************************************************/
158
acpi_ut_set_integer_width(u8 revision)159 void acpi_ut_set_integer_width(u8 revision)
160 {
161
162 if (revision < 2) {
163
164 /* 32-bit case */
165
166 acpi_gbl_integer_bit_width = 32;
167 acpi_gbl_integer_nybble_width = 8;
168 acpi_gbl_integer_byte_width = 4;
169 } else {
170 /* 64-bit case (ACPI 2.0+) */
171
172 acpi_gbl_integer_bit_width = 64;
173 acpi_gbl_integer_nybble_width = 16;
174 acpi_gbl_integer_byte_width = 8;
175 }
176 }
177
178 /*******************************************************************************
179 *
180 * FUNCTION: acpi_ut_create_update_state_and_push
181 *
182 * PARAMETERS: object - Object to be added to the new state
183 * action - Increment/Decrement
184 * state_list - List the state will be added to
185 *
186 * RETURN: Status
187 *
188 * DESCRIPTION: Create a new state and push it
189 *
190 ******************************************************************************/
191
192 acpi_status
acpi_ut_create_update_state_and_push(union acpi_operand_object * object,u16 action,union acpi_generic_state ** state_list)193 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
194 u16 action,
195 union acpi_generic_state **state_list)
196 {
197 union acpi_generic_state *state;
198
199 ACPI_FUNCTION_ENTRY();
200
201 /* Ignore null objects; these are expected */
202
203 if (!object) {
204 return (AE_OK);
205 }
206
207 state = acpi_ut_create_update_state(object, action);
208 if (!state) {
209 return (AE_NO_MEMORY);
210 }
211
212 acpi_ut_push_generic_state(state_list, state);
213 return (AE_OK);
214 }
215
216 /*******************************************************************************
217 *
218 * FUNCTION: acpi_ut_walk_package_tree
219 *
220 * PARAMETERS: source_object - The package to walk
221 * target_object - Target object (if package is being copied)
222 * walk_callback - Called once for each package element
223 * context - Passed to the callback function
224 *
225 * RETURN: Status
226 *
227 * DESCRIPTION: Walk through a package
228 *
229 ******************************************************************************/
230
231 acpi_status
acpi_ut_walk_package_tree(union acpi_operand_object * source_object,void * target_object,acpi_pkg_callback walk_callback,void * context)232 acpi_ut_walk_package_tree(union acpi_operand_object *source_object,
233 void *target_object,
234 acpi_pkg_callback walk_callback, void *context)
235 {
236 acpi_status status = AE_OK;
237 union acpi_generic_state *state_list = NULL;
238 union acpi_generic_state *state;
239 u32 this_index;
240 union acpi_operand_object *this_source_obj;
241
242 ACPI_FUNCTION_TRACE(ut_walk_package_tree);
243
244 state = acpi_ut_create_pkg_state(source_object, target_object, 0);
245 if (!state) {
246 return_ACPI_STATUS(AE_NO_MEMORY);
247 }
248
249 while (state) {
250
251 /* Get one element of the package */
252
253 this_index = state->pkg.index;
254 this_source_obj = (union acpi_operand_object *)
255 state->pkg.source_object->package.elements[this_index];
256
257 /*
258 * Check for:
259 * 1) An uninitialized package element. It is completely
260 * legal to declare a package and leave it uninitialized
261 * 2) Not an internal object - can be a namespace node instead
262 * 3) Any type other than a package. Packages are handled in else
263 * case below.
264 */
265 if ((!this_source_obj) ||
266 (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
267 ACPI_DESC_TYPE_OPERAND)
268 || (this_source_obj->common.type != ACPI_TYPE_PACKAGE)) {
269 status =
270 walk_callback(ACPI_COPY_TYPE_SIMPLE,
271 this_source_obj, state, context);
272 if (ACPI_FAILURE(status)) {
273 return_ACPI_STATUS(status);
274 }
275
276 state->pkg.index++;
277 while (state->pkg.index >=
278 state->pkg.source_object->package.count) {
279 /*
280 * We've handled all of the objects at this level, This means
281 * that we have just completed a package. That package may
282 * have contained one or more packages itself.
283 *
284 * Delete this state and pop the previous state (package).
285 */
286 acpi_ut_delete_generic_state(state);
287 state = acpi_ut_pop_generic_state(&state_list);
288
289 /* Finished when there are no more states */
290
291 if (!state) {
292 /*
293 * We have handled all of the objects in the top level
294 * package just add the length of the package objects
295 * and exit
296 */
297 return_ACPI_STATUS(AE_OK);
298 }
299
300 /*
301 * Go back up a level and move the index past the just
302 * completed package object.
303 */
304 state->pkg.index++;
305 }
306 } else {
307 /* This is a subobject of type package */
308
309 status =
310 walk_callback(ACPI_COPY_TYPE_PACKAGE,
311 this_source_obj, state, context);
312 if (ACPI_FAILURE(status)) {
313 return_ACPI_STATUS(status);
314 }
315
316 /*
317 * Push the current state and create a new one
318 * The callback above returned a new target package object.
319 */
320 acpi_ut_push_generic_state(&state_list, state);
321 state = acpi_ut_create_pkg_state(this_source_obj,
322 state->pkg.
323 this_target_obj, 0);
324 if (!state) {
325
326 /* Free any stacked Update State objects */
327
328 while (state_list) {
329 state =
330 acpi_ut_pop_generic_state
331 (&state_list);
332 acpi_ut_delete_generic_state(state);
333 }
334 return_ACPI_STATUS(AE_NO_MEMORY);
335 }
336 }
337 }
338
339 /* We should never get here */
340
341 return_ACPI_STATUS(AE_AML_INTERNAL);
342 }
343
344 #ifdef ACPI_DEBUG_OUTPUT
345 /*******************************************************************************
346 *
347 * FUNCTION: acpi_ut_display_init_pathname
348 *
349 * PARAMETERS: type - Object type of the node
350 * obj_handle - Handle whose pathname will be displayed
351 * path - Additional path string to be appended.
352 * (NULL if no extra path)
353 *
354 * RETURN: acpi_status
355 *
356 * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
357 *
358 ******************************************************************************/
359
360 void
acpi_ut_display_init_pathname(u8 type,struct acpi_namespace_node * obj_handle,char * path)361 acpi_ut_display_init_pathname(u8 type,
362 struct acpi_namespace_node *obj_handle,
363 char *path)
364 {
365 acpi_status status;
366 struct acpi_buffer buffer;
367
368 ACPI_FUNCTION_ENTRY();
369
370 /* Only print the path if the appropriate debug level is enabled */
371
372 if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
373 return;
374 }
375
376 /* Get the full pathname to the node */
377
378 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
379 status = acpi_ns_handle_to_pathname(obj_handle, &buffer, TRUE);
380 if (ACPI_FAILURE(status)) {
381 return;
382 }
383
384 /* Print what we're doing */
385
386 switch (type) {
387 case ACPI_TYPE_METHOD:
388
389 acpi_os_printf("Executing ");
390 break;
391
392 default:
393
394 acpi_os_printf("Initializing ");
395 break;
396 }
397
398 /* Print the object type and pathname */
399
400 acpi_os_printf("%-12s %s",
401 acpi_ut_get_type_name(type), (char *)buffer.pointer);
402
403 /* Extra path is used to append names like _STA, _INI, etc. */
404
405 if (path) {
406 acpi_os_printf(".%s", path);
407 }
408 acpi_os_printf("\n");
409
410 ACPI_FREE(buffer.pointer);
411 }
412 #endif
413