Erik Schmauss | 9585763 | 2018-03-14 16:13:07 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /****************************************************************************** |
| 3 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 4 | * Module Name: utalloc - local memory allocation routines |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
Bob Moore | da6f832 | 2018-01-04 10:06:38 -0800 | [diff] [blame] | 6 | * Copyright (C) 2000 - 2018, Intel Corp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Erik Schmauss | 9585763 | 2018-03-14 16:13:07 -0700 | [diff] [blame] | 8 | *****************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <acpi/acpi.h> |
Len Brown | e2f7a77 | 2009-01-09 00:30:03 -0500 | [diff] [blame] | 11 | #include "accommon.h" |
| 12 | #include "acdebug.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| 14 | #define _COMPONENT ACPI_UTILITIES |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 15 | ACPI_MODULE_NAME("utalloc") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Lv Zheng | b3c86c3 | 2013-10-29 09:29:27 +0800 | [diff] [blame] | 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 | ******************************************************************************/ |
| 31 | void *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 | |
Bob Moore | 4fa4616 | 2015-07-01 14:45:11 +0800 | [diff] [blame] | 42 | memset(allocation, 0, size); |
Lv Zheng | b3c86c3 | 2013-10-29 09:29:27 +0800 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | return (allocation); |
| 46 | } |
| 47 | |
| 48 | #endif /* !USE_NATIVE_ALLOCATE_ZEROED */ |
| 49 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 50 | /******************************************************************************* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 52 | * FUNCTION: acpi_ut_create_caches |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 54 | * PARAMETERS: None |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 56 | * RETURN: Status |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 58 | * DESCRIPTION: Create all local caches |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * |
| 60 | ******************************************************************************/ |
Lv Zheng | b3c86c3 | 2013-10-29 09:29:27 +0800 | [diff] [blame] | 61 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 62 | acpi_status acpi_ut_create_caches(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 64 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 66 | /* Object Caches, for frequently used objects */ |
| 67 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 68 | status = |
Bob Moore | 61686124 | 2006-03-17 16:44:00 -0500 | [diff] [blame] | 69 | acpi_os_create_cache("Acpi-Namespace", |
| 70 | sizeof(struct acpi_namespace_node), |
| 71 | ACPI_MAX_NAMESPACE_CACHE_DEPTH, |
| 72 | &acpi_gbl_namespace_cache); |
| 73 | if (ACPI_FAILURE(status)) { |
| 74 | return (status); |
| 75 | } |
| 76 | |
| 77 | status = |
| 78 | acpi_os_create_cache("Acpi-State", sizeof(union acpi_generic_state), |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 79 | ACPI_MAX_STATE_CACHE_DEPTH, |
| 80 | &acpi_gbl_state_cache); |
| 81 | if (ACPI_FAILURE(status)) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 82 | return (status); |
| 83 | } |
| 84 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 85 | status = |
Bob Moore | 61686124 | 2006-03-17 16:44:00 -0500 | [diff] [blame] | 86 | acpi_os_create_cache("Acpi-Parse", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 87 | sizeof(struct acpi_parse_obj_common), |
| 88 | ACPI_MAX_PARSE_CACHE_DEPTH, |
| 89 | &acpi_gbl_ps_node_cache); |
| 90 | if (ACPI_FAILURE(status)) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 91 | return (status); |
| 92 | } |
| 93 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 94 | status = |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 95 | acpi_os_create_cache("Acpi-ParseExt", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 96 | sizeof(struct acpi_parse_obj_named), |
| 97 | ACPI_MAX_EXTPARSE_CACHE_DEPTH, |
| 98 | &acpi_gbl_ps_node_ext_cache); |
| 99 | if (ACPI_FAILURE(status)) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 100 | return (status); |
| 101 | } |
| 102 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 103 | status = |
Bob Moore | 61686124 | 2006-03-17 16:44:00 -0500 | [diff] [blame] | 104 | acpi_os_create_cache("Acpi-Operand", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 105 | sizeof(union acpi_operand_object), |
| 106 | ACPI_MAX_OBJECT_CACHE_DEPTH, |
| 107 | &acpi_gbl_operand_cache); |
| 108 | if (ACPI_FAILURE(status)) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 109 | return (status); |
| 110 | } |
Bob Moore | 9cf7ade | 2017-04-28 08:53:22 +0800 | [diff] [blame] | 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 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 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 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 168 | return (AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
| 170 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 171 | /******************************************************************************* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 173 | * FUNCTION: acpi_ut_delete_caches |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 175 | * PARAMETERS: None |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 177 | * RETURN: Status |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | * |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 179 | * DESCRIPTION: Purge and delete all local caches |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | * |
| 181 | ******************************************************************************/ |
| 182 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 183 | acpi_status acpi_ut_delete_caches(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
Bob Moore | d41eb99 | 2007-02-02 19:48:23 +0300 | [diff] [blame] | 185 | #ifdef ACPI_DBG_TRACK_ALLOCATIONS |
| 186 | char buffer[7]; |
| 187 | |
| 188 | if (acpi_gbl_display_final_mem_stats) { |
Bob Moore | 4fa4616 | 2015-07-01 14:45:11 +0800 | [diff] [blame] | 189 | strcpy(buffer, "MEMORY"); |
Bob Moore | 1d18c05 | 2008-04-10 19:06:40 +0400 | [diff] [blame] | 190 | (void)acpi_db_display_statistics(buffer); |
Bob Moore | d41eb99 | 2007-02-02 19:48:23 +0300 | [diff] [blame] | 191 | } |
| 192 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Bob Moore | 61686124 | 2006-03-17 16:44:00 -0500 | [diff] [blame] | 194 | (void)acpi_os_delete_cache(acpi_gbl_namespace_cache); |
| 195 | acpi_gbl_namespace_cache = NULL; |
| 196 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 197 | (void)acpi_os_delete_cache(acpi_gbl_state_cache); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 198 | acpi_gbl_state_cache = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 200 | (void)acpi_os_delete_cache(acpi_gbl_operand_cache); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 201 | acpi_gbl_operand_cache = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 203 | (void)acpi_os_delete_cache(acpi_gbl_ps_node_cache); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 204 | acpi_gbl_ps_node_cache = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 206 | (void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache); |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 207 | acpi_gbl_ps_node_ext_cache = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
Bob Moore | 9cf7ade | 2017-04-28 08:53:22 +0800 | [diff] [blame] | 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 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 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 | |
Lv Zheng | dba47d3a | 2013-10-31 09:31:00 +0800 | [diff] [blame] | 228 | acpi_os_free(acpi_gbl_global_list); |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 229 | acpi_gbl_global_list = NULL; |
| 230 | |
Lv Zheng | dba47d3a | 2013-10-31 09:31:00 +0800 | [diff] [blame] | 231 | acpi_os_free(acpi_gbl_ns_node_list); |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 232 | acpi_gbl_ns_node_list = NULL; |
| 233 | #endif |
| 234 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 235 | return (AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | /******************************************************************************* |
| 239 | * |
| 240 | * FUNCTION: acpi_ut_validate_buffer |
| 241 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 242 | * PARAMETERS: buffer - Buffer descriptor to be validated |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | * |
| 244 | * RETURN: Status |
| 245 | * |
| 246 | * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer |
| 247 | * |
| 248 | ******************************************************************************/ |
| 249 | |
Lv Zheng | f5c1e1c | 2016-05-05 12:57:53 +0800 | [diff] [blame] | 250 | acpi_status acpi_ut_validate_buffer(struct acpi_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 261 | if ((buffer->length == ACPI_NO_BUFFER) || |
| 262 | (buffer->length == ACPI_ALLOCATE_BUFFER) || |
| 263 | (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | /******************************************************************************* |
| 277 | * |
| 278 | * FUNCTION: acpi_ut_initialize_buffer |
| 279 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 280 | * PARAMETERS: buffer - Buffer to be validated |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | * required_length - Length needed |
| 282 | * |
| 283 | * RETURN: Status |
| 284 | * |
| 285 | * DESCRIPTION: Validate that the buffer is of the required length or |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 286 | * allocate a new buffer. Returned buffer is always zeroed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | * |
| 288 | ******************************************************************************/ |
| 289 | |
| 290 | acpi_status |
Lv Zheng | f5c1e1c | 2016-05-05 12:57:53 +0800 | [diff] [blame] | 291 | acpi_ut_initialize_buffer(struct acpi_buffer *buffer, acpi_size required_length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | { |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 293 | acpi_size input_buffer_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Bob Moore | 3c7db22 | 2008-08-04 11:13:01 +0800 | [diff] [blame] | 295 | /* Parameter validation */ |
| 296 | |
| 297 | if (!buffer || !required_length) { |
| 298 | return (AE_BAD_PARAMETER); |
Ingo Molnar | f88133d | 2008-07-21 15:57:45 +0200 | [diff] [blame] | 299 | } |
Bob Moore | 3c7db22 | 2008-08-04 11:13:01 +0800 | [diff] [blame] | 300 | |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 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) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | case ACPI_NO_BUFFER: |
| 314 | |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 315 | /* Return the exception (and the required buffer length) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 317 | return (AE_BUFFER_OVERFLOW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | case ACPI_ALLOCATE_BUFFER: |
Lv Zheng | bb3fec1 | 2014-01-08 13:43:23 +0800 | [diff] [blame] | 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 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 327 | buffer->pointer = acpi_os_allocate(required_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | break; |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | case ACPI_ALLOCATE_LOCAL_BUFFER: |
| 331 | |
| 332 | /* Allocate a new buffer with local interface to allow tracking */ |
| 333 | |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 334 | buffer->pointer = ACPI_ALLOCATE(required_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | break; |
| 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | default: |
| 338 | |
| 339 | /* Existing buffer: Validate the size of the buffer */ |
| 340 | |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 341 | if (input_buffer_length < required_length) { |
| 342 | return (AE_BUFFER_OVERFLOW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | break; |
| 345 | } |
| 346 | |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 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 | |
Bob Moore | 4fa4616 | 2015-07-01 14:45:11 +0800 | [diff] [blame] | 355 | memset(buffer->pointer, 0, required_length); |
Bob Moore | 68e125c | 2008-09-27 11:34:48 +0800 | [diff] [blame] | 356 | return (AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |