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