1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /*******************************************************************************
3 *
4 * Module Name: utmisc - common utility procedures
5 *
6 ******************************************************************************/
7
8 #include <acpi/acpi.h>
9 #include "accommon.h"
10 #include "acnamesp.h"
11
12 #define _COMPONENT ACPI_UTILITIES
13 ACPI_MODULE_NAME("utmisc")
14
15 /*******************************************************************************
16 *
17 * FUNCTION: acpi_ut_is_pci_root_bridge
18 *
19 * PARAMETERS: id - The HID/CID in string format
20 *
21 * RETURN: TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
22 *
23 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
24 *
25 ******************************************************************************/
26 u8 acpi_ut_is_pci_root_bridge(char *id)
27 {
28
29 /*
30 * Check if this is a PCI root bridge.
31 * ACPI 3.0+: check for a PCI Express root also.
32 */
33 if (!(strcmp(id,
34 PCI_ROOT_HID_STRING)) ||
35 !(strcmp(id, PCI_EXPRESS_ROOT_HID_STRING))) {
36 return (TRUE);
37 }
38
39 return (FALSE);
40 }
41
42 #if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_NAMES_APP)
43 /*******************************************************************************
44 *
45 * FUNCTION: acpi_ut_is_aml_table
46 *
47 * PARAMETERS: table - An ACPI table
48 *
49 * RETURN: TRUE if table contains executable AML; FALSE otherwise
50 *
51 * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
52 * Currently, these are DSDT,SSDT,PSDT. All other table types are
53 * data tables that do not contain AML code.
54 *
55 ******************************************************************************/
56
57 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
58 {
59
60 /* These are the only tables that contain executable AML */
61
62 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_DSDT) ||
63 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_PSDT) ||
64 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_SSDT) ||
65 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_OSDT) ||
66 ACPI_IS_OEM_SIG(table->signature)) {
67 return (TRUE);
68 }
69
70 return (FALSE);
71 }
72 #endif
73
74 /*******************************************************************************
75 *
76 * FUNCTION: acpi_ut_dword_byte_swap
77 *
78 * PARAMETERS: value - Value to be converted
79 *
80 * RETURN: u32 integer with bytes swapped
81 *
82 * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
83 *
84 ******************************************************************************/
85
86 u32 acpi_ut_dword_byte_swap(u32 value)
87 {
88 union {
89 u32 value;
90 u8 bytes[4];
91 } out;
92 union {
93 u32 value;
94 u8 bytes[4];
95 } in;
96
97 ACPI_FUNCTION_ENTRY();
98
99 in.value = value;
100
101 out.bytes[0] = in.bytes[3];
102 out.bytes[1] = in.bytes[2];
103 out.bytes[2] = in.bytes[1];
104 out.bytes[3] = in.bytes[0];
105
106 return (out.value);
107 }
108
109 /*******************************************************************************
110 *
111 * FUNCTION: acpi_ut_set_integer_width
112 *
113 * PARAMETERS: Revision From DSDT header
114 *
115 * RETURN: None
116 *
117 * DESCRIPTION: Set the global integer bit width based upon the revision
118 * of the DSDT. For Revision 1 and 0, Integers are 32 bits.
119 * For Revision 2 and above, Integers are 64 bits. Yes, this
120 * makes a difference.
121 *
122 ******************************************************************************/
123
124 void acpi_ut_set_integer_width(u8 revision)
125 {
126
127 if (revision < 2) {
128
129 /* 32-bit case */
130
131 acpi_gbl_integer_bit_width = 32;
132 acpi_gbl_integer_nybble_width = 8;
133 acpi_gbl_integer_byte_width = 4;
134 } else {
135 /* 64-bit case (ACPI 2.0+) */
136
137 acpi_gbl_integer_bit_width = 64;
138 acpi_gbl_integer_nybble_width = 16;
139 acpi_gbl_integer_byte_width = 8;
140 }
141 }
142
143 /*******************************************************************************
144 *
145 * FUNCTION: acpi_ut_create_update_state_and_push
146 *
147 * PARAMETERS: object - Object to be added to the new state
148 * action - Increment/Decrement
149 * state_list - List the state will be added to
150 *
151 * RETURN: Status
152 *
153 * DESCRIPTION: Create a new state and push it
154 *
155 ******************************************************************************/
156
157 acpi_status
158 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
159 u16 action,
160 union acpi_generic_state **state_list)
161 {
162 union acpi_generic_state *state;
163
164 ACPI_FUNCTION_ENTRY();
165
166 /* Ignore null objects; these are expected */
167
168 if (!object) {
169 return (AE_OK);
170 }
171
172 state = acpi_ut_create_update_state(object, action);
173 if (!state) {
174 return (AE_NO_MEMORY);
175 }
176
177 acpi_ut_push_generic_state(state_list, state);
178 return (AE_OK);
179 }
180
181 /*******************************************************************************
182 *
183 * FUNCTION: acpi_ut_walk_package_tree
184 *
185 * PARAMETERS: source_object - The package to walk
186 * target_object - Target object (if package is being copied)
187 * walk_callback - Called once for each package element
188 * context - Passed to the callback function
189 *
190 * RETURN: Status
191 *
192 * DESCRIPTION: Walk through a package, including subpackages
193 *
194 ******************************************************************************/
195
196 acpi_status
197 acpi_ut_walk_package_tree(union acpi_operand_object *source_object,
198 void *target_object,
199 acpi_pkg_callback walk_callback, void *context)
200 {
201 acpi_status status = AE_OK;
202 union acpi_generic_state *state_list = NULL;
203 union acpi_generic_state *state;
204 union acpi_operand_object *this_source_obj;
205 u32 this_index;
206
207 ACPI_FUNCTION_TRACE(ut_walk_package_tree);
208
209 state = acpi_ut_create_pkg_state(source_object, target_object, 0);
210 if (!state) {
211 return_ACPI_STATUS(AE_NO_MEMORY);
212 }
213
214 while (state) {
215
216 /* Get one element of the package */
217
218 this_index = state->pkg.index;
219 this_source_obj =
220 state->pkg.source_object->package.elements[this_index];
221 state->pkg.this_target_obj =
222 &state->pkg.source_object->package.elements[this_index];
223
224 /*
225 * Check for:
226 * 1) An uninitialized package element. It is completely
227 * legal to declare a package and leave it uninitialized
228 * 2) Not an internal object - can be a namespace node instead
229 * 3) Any type other than a package. Packages are handled in else
230 * case below.
231 */
232 if ((!this_source_obj) ||
233 (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
234 ACPI_DESC_TYPE_OPERAND) ||
235 (this_source_obj->common.type != ACPI_TYPE_PACKAGE)) {
236 status =
237 walk_callback(ACPI_COPY_TYPE_SIMPLE,
238 this_source_obj, state, context);
239 if (ACPI_FAILURE(status)) {
240 return_ACPI_STATUS(status);
241 }
242
243 state->pkg.index++;
244 while (state->pkg.index >=
245 state->pkg.source_object->package.count) {
246 /*
247 * We've handled all of the objects at this level, This means
248 * that we have just completed a package. That package may
249 * have contained one or more packages itself.
250 *
251 * Delete this state and pop the previous state (package).
252 */
253 acpi_ut_delete_generic_state(state);
254 state = acpi_ut_pop_generic_state(&state_list);
255
256 /* Finished when there are no more states */
257
258 if (!state) {
259 /*
260 * We have handled all of the objects in the top level
261 * package just add the length of the package objects
262 * and exit
263 */
264 return_ACPI_STATUS(AE_OK);
265 }
266
267 /*
268 * Go back up a level and move the index past the just
269 * completed package object.
270 */
271 state->pkg.index++;
272 }
273 } else {
274 /* This is a subobject of type package */
275
276 status =
277 walk_callback(ACPI_COPY_TYPE_PACKAGE,
278 this_source_obj, state, context);
279 if (ACPI_FAILURE(status)) {
280 return_ACPI_STATUS(status);
281 }
282
283 /*
284 * Push the current state and create a new one
285 * The callback above returned a new target package object.
286 */
287 acpi_ut_push_generic_state(&state_list, state);
288 state =
289 acpi_ut_create_pkg_state(this_source_obj,
290 state->pkg.this_target_obj,
291 0);
292 if (!state) {
293
294 /* Free any stacked Update State objects */
295
296 while (state_list) {
297 state =
298 acpi_ut_pop_generic_state
299 (&state_list);
300 acpi_ut_delete_generic_state(state);
301 }
302 return_ACPI_STATUS(AE_NO_MEMORY);
303 }
304 }
305 }
306
307 /* We should never get here */
308
309 ACPI_ERROR((AE_INFO, "State list did not terminate correctly"));
310
311 return_ACPI_STATUS(AE_AML_INTERNAL);
312 }
313
314 #ifdef ACPI_DEBUG_OUTPUT
315 /*******************************************************************************
316 *
317 * FUNCTION: acpi_ut_display_init_pathname
318 *
319 * PARAMETERS: type - Object type of the node
320 * obj_handle - Handle whose pathname will be displayed
321 * path - Additional path string to be appended.
322 * (NULL if no extra path)
323 *
324 * RETURN: acpi_status
325 *
326 * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
327 *
328 ******************************************************************************/
329
330 void
331 acpi_ut_display_init_pathname(u8 type,
332 struct acpi_namespace_node *obj_handle,
333 const char *path)
334 {
335 acpi_status status;
336 struct acpi_buffer buffer;
337
338 ACPI_FUNCTION_ENTRY();
339
340 /* Only print the path if the appropriate debug level is enabled */
341
342 if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
343 return;
344 }
345
346 /* Get the full pathname to the node */
347
348 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
349 status = acpi_ns_handle_to_pathname(obj_handle, &buffer, TRUE);
350 if (ACPI_FAILURE(status)) {
351 return;
352 }
353
354 /* Print what we're doing */
355
356 switch (type) {
357 case ACPI_TYPE_METHOD:
358
359 acpi_os_printf("Executing ");
360 break;
361
362 default:
363
364 acpi_os_printf("Initializing ");
365 break;
366 }
367
368 /* Print the object type and pathname */
369
370 acpi_os_printf("%-12s %s",
371 acpi_ut_get_type_name(type), (char *)buffer.pointer);
372
373 /* Extra path is used to append names like _STA, _INI, etc. */
374
375 if (path) {
376 acpi_os_printf(".%s", path);
377 }
378 acpi_os_printf("\n");
379
380 ACPI_FREE(buffer.pointer);
381 }
382 #endif