1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: utalloc - local memory allocation routines
5 *
6 * Copyright (C) 2000 - 2025, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acdebug.h"
13
14#define _COMPONENT ACPI_UTILITIES
15ACPI_MODULE_NAME("utalloc")
16
17#if !defined (USE_NATIVE_ALLOCATE_ZEROED)
18/*******************************************************************************
19 *
20 * FUNCTION: acpi_os_allocate_zeroed
21 *
22 * PARAMETERS: size - Size of the allocation
23 *
24 * RETURN: Address of the allocated memory on success, NULL on failure.
25 *
26 * DESCRIPTION: Subsystem equivalent of calloc. Allocate and zero memory.
27 * This is the default implementation. Can be overridden via the
28 * USE_NATIVE_ALLOCATE_ZEROED flag.
29 *
30 ******************************************************************************/
31void *acpi_os_allocate_zeroed(acpi_size size)
32{
33 void *allocation;
34
35 ACPI_FUNCTION_ENTRY();
36
37 allocation = acpi_os_allocate(size);
38 if (allocation) {
39
40 /* Clear the memory block */
41
42 memset(allocation, 0, size);
43 }
44
45 return (allocation);
46}
47
48#endif /* !USE_NATIVE_ALLOCATE_ZEROED */
49
50/*******************************************************************************
51 *
52 * FUNCTION: acpi_ut_create_caches
53 *
54 * PARAMETERS: None
55 *
56 * RETURN: Status
57 *
58 * DESCRIPTION: Create all local caches
59 *
60 ******************************************************************************/
61
62acpi_status acpi_ut_create_caches(void)
63{
64 acpi_status status;
65
66 /* Object Caches, for frequently used objects */
67
68 status =
69 acpi_os_create_cache(cache_name: "Acpi-Namespace",
70 object_size: sizeof(struct acpi_namespace_node),
71 ACPI_MAX_NAMESPACE_CACHE_DEPTH,
72 return_cache: &acpi_gbl_namespace_cache);
73 if (ACPI_FAILURE(status)) {
74 return (status);
75 }
76
77 status =
78 acpi_os_create_cache(cache_name: "Acpi-State", object_size: sizeof(union acpi_generic_state),
79 ACPI_MAX_STATE_CACHE_DEPTH,
80 return_cache: &acpi_gbl_state_cache);
81 if (ACPI_FAILURE(status)) {
82 return (status);
83 }
84
85 status =
86 acpi_os_create_cache(cache_name: "Acpi-Parse",
87 object_size: sizeof(struct acpi_parse_obj_common),
88 ACPI_MAX_PARSE_CACHE_DEPTH,
89 return_cache: &acpi_gbl_ps_node_cache);
90 if (ACPI_FAILURE(status)) {
91 return (status);
92 }
93
94 status =
95 acpi_os_create_cache(cache_name: "Acpi-ParseExt",
96 object_size: sizeof(struct acpi_parse_obj_named),
97 ACPI_MAX_EXTPARSE_CACHE_DEPTH,
98 return_cache: &acpi_gbl_ps_node_ext_cache);
99 if (ACPI_FAILURE(status)) {
100 return (status);
101 }
102
103 status =
104 acpi_os_create_cache(cache_name: "Acpi-Operand",
105 object_size: sizeof(union acpi_operand_object),
106 ACPI_MAX_OBJECT_CACHE_DEPTH,
107 return_cache: &acpi_gbl_operand_cache);
108 if (ACPI_FAILURE(status)) {
109 return (status);
110 }
111#ifdef ACPI_ASL_COMPILER
112 /*
113 * For use with the ASL-/ASL+ option. This cache keeps track of regular
114 * 0xA9 0x01 comments.
115 */
116 status =
117 acpi_os_create_cache("Acpi-Comment",
118 sizeof(struct acpi_comment_node),
119 ACPI_MAX_COMMENT_CACHE_DEPTH,
120 &acpi_gbl_reg_comment_cache);
121 if (ACPI_FAILURE(status)) {
122 return (status);
123 }
124
125 /*
126 * This cache keeps track of the starting addresses of where the comments
127 * lie. This helps prevent duplication of comments.
128 */
129 status =
130 acpi_os_create_cache("Acpi-Comment-Addr",
131 sizeof(struct acpi_comment_addr_node),
132 ACPI_MAX_COMMENT_CACHE_DEPTH,
133 &acpi_gbl_comment_addr_cache);
134 if (ACPI_FAILURE(status)) {
135 return (status);
136 }
137
138 /*
139 * This cache will be used for nodes that represent files.
140 */
141 status =
142 acpi_os_create_cache("Acpi-File", sizeof(struct acpi_file_node),
143 ACPI_MAX_COMMENT_CACHE_DEPTH,
144 &acpi_gbl_file_cache);
145 if (ACPI_FAILURE(status)) {
146 return (status);
147 }
148#endif
149
150#ifdef ACPI_DBG_TRACK_ALLOCATIONS
151
152 /* Memory allocation lists */
153
154 status = acpi_ut_create_list("Acpi-Global", 0, &acpi_gbl_global_list);
155 if (ACPI_FAILURE(status)) {
156 return (status);
157 }
158
159 status =
160 acpi_ut_create_list("Acpi-Namespace",
161 sizeof(struct acpi_namespace_node),
162 &acpi_gbl_ns_node_list);
163 if (ACPI_FAILURE(status)) {
164 return (status);
165 }
166#endif
167
168 return (AE_OK);
169}
170
171/*******************************************************************************
172 *
173 * FUNCTION: acpi_ut_delete_caches
174 *
175 * PARAMETERS: None
176 *
177 * RETURN: Status
178 *
179 * DESCRIPTION: Purge and delete all local caches
180 *
181 ******************************************************************************/
182
183acpi_status acpi_ut_delete_caches(void)
184{
185#ifdef ACPI_DBG_TRACK_ALLOCATIONS
186 char buffer[7];
187
188 if (acpi_gbl_display_final_mem_stats) {
189 strcpy(buffer, "MEMORY");
190 (void)acpi_db_display_statistics(buffer);
191 }
192#endif
193
194 (void)acpi_os_delete_cache(cache: acpi_gbl_namespace_cache);
195 acpi_gbl_namespace_cache = NULL;
196
197 (void)acpi_os_delete_cache(cache: acpi_gbl_state_cache);
198 acpi_gbl_state_cache = NULL;
199
200 (void)acpi_os_delete_cache(cache: acpi_gbl_operand_cache);
201 acpi_gbl_operand_cache = NULL;
202
203 (void)acpi_os_delete_cache(cache: acpi_gbl_ps_node_cache);
204 acpi_gbl_ps_node_cache = NULL;
205
206 (void)acpi_os_delete_cache(cache: acpi_gbl_ps_node_ext_cache);
207 acpi_gbl_ps_node_ext_cache = NULL;
208
209#ifdef ACPI_ASL_COMPILER
210 (void)acpi_os_delete_cache(acpi_gbl_reg_comment_cache);
211 acpi_gbl_reg_comment_cache = NULL;
212
213 (void)acpi_os_delete_cache(acpi_gbl_comment_addr_cache);
214 acpi_gbl_comment_addr_cache = NULL;
215
216 (void)acpi_os_delete_cache(acpi_gbl_file_cache);
217 acpi_gbl_file_cache = NULL;
218#endif
219
220#ifdef ACPI_DBG_TRACK_ALLOCATIONS
221
222 /* Debug only - display leftover memory allocation, if any */
223
224 acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);
225
226 /* Free memory lists */
227
228 acpi_os_free(acpi_gbl_global_list);
229 acpi_gbl_global_list = NULL;
230
231 acpi_os_free(acpi_gbl_ns_node_list);
232 acpi_gbl_ns_node_list = NULL;
233#endif
234
235 return (AE_OK);
236}
237
238/*******************************************************************************
239 *
240 * FUNCTION: acpi_ut_validate_buffer
241 *
242 * PARAMETERS: buffer - Buffer descriptor to be validated
243 *
244 * RETURN: Status
245 *
246 * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
247 *
248 ******************************************************************************/
249
250acpi_status acpi_ut_validate_buffer(struct acpi_buffer *buffer)
251{
252
253 /* Obviously, the structure pointer must be valid */
254
255 if (!buffer) {
256 return (AE_BAD_PARAMETER);
257 }
258
259 /* Special semantics for the length */
260
261 if ((buffer->length == ACPI_NO_BUFFER) ||
262 (buffer->length == ACPI_ALLOCATE_BUFFER) ||
263 (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
264 return (AE_OK);
265 }
266
267 /* Length is valid, the buffer pointer must be also */
268
269 if (!buffer->pointer) {
270 return (AE_BAD_PARAMETER);
271 }
272
273 return (AE_OK);
274}
275
276/*******************************************************************************
277 *
278 * FUNCTION: acpi_ut_initialize_buffer
279 *
280 * PARAMETERS: buffer - Buffer to be validated
281 * required_length - Length needed
282 *
283 * RETURN: Status
284 *
285 * DESCRIPTION: Validate that the buffer is of the required length or
286 * allocate a new buffer. Returned buffer is always zeroed.
287 *
288 ******************************************************************************/
289
290acpi_status
291acpi_ut_initialize_buffer(struct acpi_buffer *buffer, acpi_size required_length)
292{
293 acpi_size input_buffer_length;
294
295 /* Parameter validation */
296
297 if (!buffer || !required_length) {
298 return (AE_BAD_PARAMETER);
299 }
300
301 /*
302 * Buffer->Length is used as both an input and output parameter. Get the
303 * input actual length and set the output required buffer length.
304 */
305 input_buffer_length = buffer->length;
306 buffer->length = required_length;
307
308 /*
309 * The input buffer length contains the actual buffer length, or the type
310 * of buffer to be allocated by this routine.
311 */
312 switch (input_buffer_length) {
313 case ACPI_NO_BUFFER:
314
315 /* Return the exception (and the required buffer length) */
316
317 return (AE_BUFFER_OVERFLOW);
318
319 case ACPI_ALLOCATE_BUFFER:
320 /*
321 * Allocate a new buffer. We directectly call acpi_os_allocate here to
322 * purposefully bypass the (optionally enabled) internal allocation
323 * tracking mechanism since we only want to track internal
324 * allocations. Note: The caller should use acpi_os_free to free this
325 * buffer created via ACPI_ALLOCATE_BUFFER.
326 */
327 buffer->pointer = acpi_os_allocate(required_length);
328 break;
329
330 case ACPI_ALLOCATE_LOCAL_BUFFER:
331
332 /* Allocate a new buffer with local interface to allow tracking */
333
334 buffer->pointer = ACPI_ALLOCATE(required_length);
335 break;
336
337 default:
338
339 /* Existing buffer: Validate the size of the buffer */
340
341 if (input_buffer_length < required_length) {
342 return (AE_BUFFER_OVERFLOW);
343 }
344 break;
345 }
346
347 /* Validate allocation from above or input buffer pointer */
348
349 if (!buffer->pointer) {
350 return (AE_NO_MEMORY);
351 }
352
353 /* Have a valid buffer, clear it */
354
355 memset(s: buffer->pointer, c: 0, n: required_length);
356 return (AE_OK);
357}
358