1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
2 /*
3 * Copyright (c) 2015-2021, Linaro Limited
4 */
5 #ifndef OPTEE_SMC_H
6 #define OPTEE_SMC_H
7
8 #include <linux/arm-smccc.h>
9 #include <linux/bitops.h>
10
11 #define OPTEE_SMC_STD_CALL_VAL(func_num) \
12 ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
13 ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
14 #define OPTEE_SMC_FAST_CALL_VAL(func_num) \
15 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
16 ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
17
18 /*
19 * Function specified by SMC Calling convention.
20 */
21 #define OPTEE_SMC_FUNCID_CALLS_COUNT 0xFF00
22 #define OPTEE_SMC_CALLS_COUNT \
23 ARM_SMCCC_CALL_VAL(OPTEE_SMC_FAST_CALL, SMCCC_SMC_32, \
24 SMCCC_OWNER_TRUSTED_OS_END, \
25 OPTEE_SMC_FUNCID_CALLS_COUNT)
26
27 /*
28 * Normal cached memory (write-back), shareable for SMP systems and not
29 * shareable for UP systems.
30 */
31 #define OPTEE_SMC_SHM_CACHED 1
32
33 /*
34 * a0..a7 is used as register names in the descriptions below, on arm32
35 * that translates to r0..r7 and on arm64 to w0..w7. In both cases it's
36 * 32-bit registers.
37 */
38
39 /*
40 * Function specified by SMC Calling convention
41 *
42 * Return the following UID if using API specified in this file
43 * without further extensions:
44 * 384fb3e0-e7f8-11e3-af63-0002a5d5c51b.
45 * see also OPTEE_MSG_UID_* in optee_msg.h
46 */
47 #define OPTEE_SMC_FUNCID_CALLS_UID OPTEE_MSG_FUNCID_CALLS_UID
48 #define OPTEE_SMC_CALLS_UID \
49 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
50 ARM_SMCCC_OWNER_TRUSTED_OS_END, \
51 OPTEE_SMC_FUNCID_CALLS_UID)
52
53 /*
54 * Function specified by SMC Calling convention
55 *
56 * Returns 2.0 if using API specified in this file without further extensions.
57 * see also OPTEE_MSG_REVISION_* in optee_msg.h
58 */
59 #define OPTEE_SMC_FUNCID_CALLS_REVISION OPTEE_MSG_FUNCID_CALLS_REVISION
60 #define OPTEE_SMC_CALLS_REVISION \
61 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
62 ARM_SMCCC_OWNER_TRUSTED_OS_END, \
63 OPTEE_SMC_FUNCID_CALLS_REVISION)
64
65 struct optee_smc_calls_revision_result {
66 unsigned long major;
67 unsigned long minor;
68 unsigned long reserved0;
69 unsigned long reserved1;
70 };
71
72 /*
73 * Get UUID of Trusted OS.
74 *
75 * Used by non-secure world to figure out which Trusted OS is installed.
76 * Note that returned UUID is the UUID of the Trusted OS, not of the API.
77 *
78 * Returns UUID in a0-4 in the same way as OPTEE_SMC_CALLS_UID
79 * described above.
80 */
81 #define OPTEE_SMC_FUNCID_GET_OS_UUID OPTEE_MSG_FUNCID_GET_OS_UUID
82 #define OPTEE_SMC_CALL_GET_OS_UUID \
83 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_UUID)
84
85 /*
86 * Get revision of Trusted OS.
87 *
88 * Used by non-secure world to figure out which version of the Trusted OS
89 * is installed. Note that the returned revision is the revision of the
90 * Trusted OS, not of the API.
91 *
92 * Returns revision in a0-1 in the same way as OPTEE_SMC_CALLS_REVISION
93 * described above. May optionally return a 32-bit build identifier in a2,
94 * with zero meaning unspecified.
95 */
96 #define OPTEE_SMC_FUNCID_GET_OS_REVISION OPTEE_MSG_FUNCID_GET_OS_REVISION
97 #define OPTEE_SMC_CALL_GET_OS_REVISION \
98 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_REVISION)
99
100 struct optee_smc_call_get_os_revision_result {
101 unsigned long major;
102 unsigned long minor;
103 unsigned long build_id;
104 unsigned long reserved1;
105 };
106
107 /*
108 * Load Trusted OS from optee/tee.bin in the Linux firmware.
109 *
110 * WARNING: Use this cautiously as it could lead to insecure loading of the
111 * Trusted OS.
112 * This SMC instructs EL3 to load a binary and execute it as the Trusted OS.
113 *
114 * Call register usage:
115 * a0 SMC Function ID, OPTEE_SMC_CALL_LOAD_IMAGE
116 * a1 Upper 32bit of a 64bit size for the payload
117 * a2 Lower 32bit of a 64bit size for the payload
118 * a3 Upper 32bit of the physical address for the payload
119 * a4 Lower 32bit of the physical address for the payload
120 *
121 * The payload is in the OP-TEE image format.
122 *
123 * Returns result in a0, 0 on success and an error code otherwise.
124 */
125 #define OPTEE_SMC_FUNCID_LOAD_IMAGE 2
126 #define OPTEE_SMC_CALL_LOAD_IMAGE \
127 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
128 ARM_SMCCC_OWNER_TRUSTED_OS_END, \
129 OPTEE_SMC_FUNCID_LOAD_IMAGE)
130
131 /*
132 * Call with struct optee_msg_arg as argument
133 *
134 * When called with OPTEE_SMC_CALL_WITH_RPC_ARG or
135 * OPTEE_SMC_CALL_WITH_REGD_ARG in a0 there is one RPC struct optee_msg_arg
136 * following after the first struct optee_msg_arg. The RPC struct
137 * optee_msg_arg has reserved space for the number of RPC parameters as
138 * returned by OPTEE_SMC_EXCHANGE_CAPABILITIES.
139 *
140 * When calling these functions, normal world has a few responsibilities:
141 * 1. It must be able to handle eventual RPCs
142 * 2. Non-secure interrupts should not be masked
143 * 3. If asynchronous notifications has been negotiated successfully, then
144 * the interrupt for asynchronous notifications should be unmasked
145 * during this call.
146 *
147 * Call register usage, OPTEE_SMC_CALL_WITH_ARG and
148 * OPTEE_SMC_CALL_WITH_RPC_ARG:
149 * a0 SMC Function ID, OPTEE_SMC_CALL_WITH_ARG or OPTEE_SMC_CALL_WITH_RPC_ARG
150 * a1 Upper 32 bits of a 64-bit physical pointer to a struct optee_msg_arg
151 * a2 Lower 32 bits of a 64-bit physical pointer to a struct optee_msg_arg
152 * a3 Cache settings, not used if physical pointer is in a predefined shared
153 * memory area else per OPTEE_SMC_SHM_*
154 * a4-6 Not used
155 * a7 Hypervisor Client ID register
156 *
157 * Call register usage, OPTEE_SMC_CALL_WITH_REGD_ARG:
158 * a0 SMC Function ID, OPTEE_SMC_CALL_WITH_REGD_ARG
159 * a1 Upper 32 bits of a 64-bit shared memory cookie
160 * a2 Lower 32 bits of a 64-bit shared memory cookie
161 * a3 Offset of the struct optee_msg_arg in the shared memory with the
162 * supplied cookie
163 * a4-6 Not used
164 * a7 Hypervisor Client ID register
165 *
166 * Normal return register usage:
167 * a0 Return value, OPTEE_SMC_RETURN_*
168 * a1-3 Not used
169 * a4-7 Preserved
170 *
171 * OPTEE_SMC_RETURN_ETHREAD_LIMIT return register usage:
172 * a0 Return value, OPTEE_SMC_RETURN_ETHREAD_LIMIT
173 * a1-3 Preserved
174 * a4-7 Preserved
175 *
176 * RPC return register usage:
177 * a0 Return value, OPTEE_SMC_RETURN_IS_RPC(val)
178 * a1-2 RPC parameters
179 * a3-7 Resume information, must be preserved
180 *
181 * Possible return values:
182 * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this
183 * function.
184 * OPTEE_SMC_RETURN_OK Call completed, result updated in
185 * the previously supplied struct
186 * optee_msg_arg.
187 * OPTEE_SMC_RETURN_ETHREAD_LIMIT Number of Trusted OS threads exceeded,
188 * try again later.
189 * OPTEE_SMC_RETURN_EBADADDR Bad physical pointer to struct
190 * optee_msg_arg.
191 * OPTEE_SMC_RETURN_EBADCMD Bad/unknown cmd in struct optee_msg_arg
192 * OPTEE_SMC_RETURN_IS_RPC() Call suspended by RPC call to normal
193 * world.
194 */
195 #define OPTEE_SMC_FUNCID_CALL_WITH_ARG OPTEE_MSG_FUNCID_CALL_WITH_ARG
196 #define OPTEE_SMC_CALL_WITH_ARG \
197 OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_ARG)
198 #define OPTEE_SMC_CALL_WITH_RPC_ARG \
199 OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_RPC_ARG)
200 #define OPTEE_SMC_CALL_WITH_REGD_ARG \
201 OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG)
202
203 /*
204 * Get Shared Memory Config
205 *
206 * Returns the Secure/Non-secure shared memory config.
207 *
208 * Call register usage:
209 * a0 SMC Function ID, OPTEE_SMC_GET_SHM_CONFIG
210 * a1-6 Not used
211 * a7 Hypervisor Client ID register
212 *
213 * Have config return register usage:
214 * a0 OPTEE_SMC_RETURN_OK
215 * a1 Physical address of start of SHM
216 * a2 Size of SHM
217 * a3 Cache settings of memory, as defined by the
218 * OPTEE_SMC_SHM_* values above
219 * a4-7 Preserved
220 *
221 * Not available register usage:
222 * a0 OPTEE_SMC_RETURN_ENOTAVAIL
223 * a1-3 Not used
224 * a4-7 Preserved
225 */
226 #define OPTEE_SMC_FUNCID_GET_SHM_CONFIG 7
227 #define OPTEE_SMC_GET_SHM_CONFIG \
228 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SHM_CONFIG)
229
230 struct optee_smc_get_shm_config_result {
231 unsigned long status;
232 unsigned long start;
233 unsigned long size;
234 unsigned long settings;
235 };
236
237 /*
238 * Exchanges capabilities between normal world and secure world
239 *
240 * Call register usage:
241 * a0 SMC Function ID, OPTEE_SMC_EXCHANGE_CAPABILITIES
242 * a1 bitfield of normal world capabilities OPTEE_SMC_NSEC_CAP_*
243 * a2-6 Not used
244 * a7 Hypervisor Client ID register
245 *
246 * Normal return register usage:
247 * a0 OPTEE_SMC_RETURN_OK
248 * a1 bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
249 * a2 The maximum secure world notification number
250 * a3 Bit[7:0]: Number of parameters needed for RPC to be supplied
251 * as the second MSG arg struct for
252 * OPTEE_SMC_CALL_WITH_ARG
253 * Bit[31:8]: Reserved (MBZ)
254 * a4-7 Preserved
255 *
256 * Error return register usage:
257 * a0 OPTEE_SMC_RETURN_ENOTAVAIL, can't use the capabilities from normal world
258 * a1 bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
259 * a2-7 Preserved
260 */
261 /* Normal world works as a uniprocessor system */
262 #define OPTEE_SMC_NSEC_CAP_UNIPROCESSOR BIT(0)
263 /* Secure world has reserved shared memory for normal world to use */
264 #define OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM BIT(0)
265 /* Secure world can communicate via previously unregistered shared memory */
266 #define OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM BIT(1)
267
268 /*
269 * Secure world supports commands "register/unregister shared memory",
270 * secure world accepts command buffers located in any parts of non-secure RAM
271 */
272 #define OPTEE_SMC_SEC_CAP_DYNAMIC_SHM BIT(2)
273 /* Secure world is built with virtualization support */
274 #define OPTEE_SMC_SEC_CAP_VIRTUALIZATION BIT(3)
275 /* Secure world supports Shared Memory with a NULL reference */
276 #define OPTEE_SMC_SEC_CAP_MEMREF_NULL BIT(4)
277 /* Secure world supports asynchronous notification of normal world */
278 #define OPTEE_SMC_SEC_CAP_ASYNC_NOTIF BIT(5)
279 /* Secure world supports pre-allocating RPC arg struct */
280 #define OPTEE_SMC_SEC_CAP_RPC_ARG BIT(6)
281
282 #define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9
283 #define OPTEE_SMC_EXCHANGE_CAPABILITIES \
284 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES)
285
286 struct optee_smc_exchange_capabilities_result {
287 unsigned long status;
288 unsigned long capabilities;
289 unsigned long max_notif_value;
290 unsigned long data;
291 };
292
293 /*
294 * Disable and empties cache of shared memory objects
295 *
296 * Secure world can cache frequently used shared memory objects, for
297 * example objects used as RPC arguments. When secure world is idle this
298 * function returns one shared memory reference to free. To disable the
299 * cache and free all cached objects this function has to be called until
300 * it returns OPTEE_SMC_RETURN_ENOTAVAIL.
301 *
302 * Call register usage:
303 * a0 SMC Function ID, OPTEE_SMC_DISABLE_SHM_CACHE
304 * a1-6 Not used
305 * a7 Hypervisor Client ID register
306 *
307 * Normal return register usage:
308 * a0 OPTEE_SMC_RETURN_OK
309 * a1 Upper 32 bits of a 64-bit Shared memory cookie
310 * a2 Lower 32 bits of a 64-bit Shared memory cookie
311 * a3-7 Preserved
312 *
313 * Cache empty return register usage:
314 * a0 OPTEE_SMC_RETURN_ENOTAVAIL
315 * a1-7 Preserved
316 *
317 * Not idle return register usage:
318 * a0 OPTEE_SMC_RETURN_EBUSY
319 * a1-7 Preserved
320 */
321 #define OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE 10
322 #define OPTEE_SMC_DISABLE_SHM_CACHE \
323 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE)
324
325 struct optee_smc_disable_shm_cache_result {
326 unsigned long status;
327 unsigned long shm_upper32;
328 unsigned long shm_lower32;
329 unsigned long reserved0;
330 };
331
332 /*
333 * Enable cache of shared memory objects
334 *
335 * Secure world can cache frequently used shared memory objects, for
336 * example objects used as RPC arguments. When secure world is idle this
337 * function returns OPTEE_SMC_RETURN_OK and the cache is enabled. If
338 * secure world isn't idle OPTEE_SMC_RETURN_EBUSY is returned.
339 *
340 * Call register usage:
341 * a0 SMC Function ID, OPTEE_SMC_ENABLE_SHM_CACHE
342 * a1-6 Not used
343 * a7 Hypervisor Client ID register
344 *
345 * Normal return register usage:
346 * a0 OPTEE_SMC_RETURN_OK
347 * a1-7 Preserved
348 *
349 * Not idle return register usage:
350 * a0 OPTEE_SMC_RETURN_EBUSY
351 * a1-7 Preserved
352 */
353 #define OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE 11
354 #define OPTEE_SMC_ENABLE_SHM_CACHE \
355 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE)
356
357 /*
358 * Query OP-TEE about number of supported threads
359 *
360 * Normal World OS or Hypervisor issues this call to find out how many
361 * threads OP-TEE supports. That is how many standard calls can be issued
362 * in parallel before OP-TEE will return OPTEE_SMC_RETURN_ETHREAD_LIMIT.
363 *
364 * Call requests usage:
365 * a0 SMC Function ID, OPTEE_SMC_GET_THREAD_COUNT
366 * a1-6 Not used
367 * a7 Hypervisor Client ID register
368 *
369 * Normal return register usage:
370 * a0 OPTEE_SMC_RETURN_OK
371 * a1 Number of threads
372 * a2-7 Preserved
373 *
374 * Error return:
375 * a0 OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Requested call is not implemented
376 * a1-7 Preserved
377 */
378 #define OPTEE_SMC_FUNCID_GET_THREAD_COUNT 15
379 #define OPTEE_SMC_GET_THREAD_COUNT \
380 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_THREAD_COUNT)
381
382 /*
383 * Inform OP-TEE that normal world is able to receive asynchronous
384 * notifications.
385 *
386 * Call requests usage:
387 * a0 SMC Function ID, OPTEE_SMC_ENABLE_ASYNC_NOTIF
388 * a1-6 Not used
389 * a7 Hypervisor Client ID register
390 *
391 * Normal return register usage:
392 * a0 OPTEE_SMC_RETURN_OK
393 * a1-7 Preserved
394 *
395 * Not supported return register usage:
396 * a0 OPTEE_SMC_RETURN_ENOTAVAIL
397 * a1-7 Preserved
398 */
399 #define OPTEE_SMC_FUNCID_ENABLE_ASYNC_NOTIF 16
400 #define OPTEE_SMC_ENABLE_ASYNC_NOTIF \
401 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_ENABLE_ASYNC_NOTIF)
402
403 /*
404 * Retrieve a value of notifications pending since the last call of this
405 * function.
406 *
407 * OP-TEE keeps a record of all posted values. When an interrupt is
408 * received which indicates that there are posted values this function
409 * should be called until all pended values have been retrieved. When a
410 * value is retrieved, it's cleared from the record in secure world.
411 *
412 * It is expected that this function is called from an interrupt handler
413 * in normal world.
414 *
415 * Call requests usage:
416 * a0 SMC Function ID, OPTEE_SMC_GET_ASYNC_NOTIF_VALUE
417 * a1-6 Not used
418 * a7 Hypervisor Client ID register
419 *
420 * Normal return register usage:
421 * a0 OPTEE_SMC_RETURN_OK
422 * a1 value
423 * a2 Bit[0]: OPTEE_SMC_ASYNC_NOTIF_VALUE_VALID if the value in a1 is
424 * valid, else 0 if no values where pending
425 * a2 Bit[1]: OPTEE_SMC_ASYNC_NOTIF_VALUE_PENDING if another value is
426 * pending, else 0.
427 * Bit[31:2]: MBZ
428 * a3-7 Preserved
429 *
430 * Not supported return register usage:
431 * a0 OPTEE_SMC_RETURN_ENOTAVAIL
432 * a1-7 Preserved
433 */
434 #define OPTEE_SMC_ASYNC_NOTIF_VALUE_VALID BIT(0)
435 #define OPTEE_SMC_ASYNC_NOTIF_VALUE_PENDING BIT(1)
436
437 /*
438 * Notification that OP-TEE expects a yielding call to do some bottom half
439 * work in a driver.
440 */
441 #define OPTEE_SMC_ASYNC_NOTIF_VALUE_DO_BOTTOM_HALF 0
442
443 #define OPTEE_SMC_FUNCID_GET_ASYNC_NOTIF_VALUE 17
444 #define OPTEE_SMC_GET_ASYNC_NOTIF_VALUE \
445 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_ASYNC_NOTIF_VALUE)
446
447 /* See OPTEE_SMC_CALL_WITH_RPC_ARG above */
448 #define OPTEE_SMC_FUNCID_CALL_WITH_RPC_ARG 18
449
450 /* See OPTEE_SMC_CALL_WITH_REGD_ARG above */
451 #define OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG 19
452
453 /*
454 * Resume from RPC (for example after processing a foreign interrupt)
455 *
456 * Call register usage:
457 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC
458 * a1-3 Value of a1-3 when OPTEE_SMC_CALL_WITH_ARG returned
459 * OPTEE_SMC_RETURN_RPC in a0
460 *
461 * Return register usage is the same as for OPTEE_SMC_*CALL_WITH_ARG above.
462 *
463 * Possible return values
464 * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this
465 * function.
466 * OPTEE_SMC_RETURN_OK Original call completed, result
467 * updated in the previously supplied.
468 * struct optee_msg_arg
469 * OPTEE_SMC_RETURN_RPC Call suspended by RPC call to normal
470 * world.
471 * OPTEE_SMC_RETURN_ERESUME Resume failed, the opaque resume
472 * information was corrupt.
473 */
474 #define OPTEE_SMC_FUNCID_RETURN_FROM_RPC 3
475 #define OPTEE_SMC_CALL_RETURN_FROM_RPC \
476 OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_RETURN_FROM_RPC)
477
478 #define OPTEE_SMC_RETURN_RPC_PREFIX_MASK 0xFFFF0000
479 #define OPTEE_SMC_RETURN_RPC_PREFIX 0xFFFF0000
480 #define OPTEE_SMC_RETURN_RPC_FUNC_MASK 0x0000FFFF
481
482 #define OPTEE_SMC_RETURN_GET_RPC_FUNC(ret) \
483 ((ret) & OPTEE_SMC_RETURN_RPC_FUNC_MASK)
484
485 #define OPTEE_SMC_RPC_VAL(func) ((func) | OPTEE_SMC_RETURN_RPC_PREFIX)
486
487 /*
488 * Allocate memory for RPC parameter passing. The memory is used to hold a
489 * struct optee_msg_arg.
490 *
491 * "Call" register usage:
492 * a0 This value, OPTEE_SMC_RETURN_RPC_ALLOC
493 * a1 Size in bytes of required argument memory
494 * a2 Not used
495 * a3 Resume information, must be preserved
496 * a4-5 Not used
497 * a6-7 Resume information, must be preserved
498 *
499 * "Return" register usage:
500 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
501 * a1 Upper 32 bits of 64-bit physical pointer to allocated
502 * memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
503 * be allocated.
504 * a2 Lower 32 bits of 64-bit physical pointer to allocated
505 * memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
506 * be allocated
507 * a3 Preserved
508 * a4 Upper 32 bits of 64-bit Shared memory cookie used when freeing
509 * the memory or doing an RPC
510 * a5 Lower 32 bits of 64-bit Shared memory cookie used when freeing
511 * the memory or doing an RPC
512 * a6-7 Preserved
513 */
514 #define OPTEE_SMC_RPC_FUNC_ALLOC 0
515 #define OPTEE_SMC_RETURN_RPC_ALLOC \
516 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_ALLOC)
517
518 /*
519 * Free memory previously allocated by OPTEE_SMC_RETURN_RPC_ALLOC
520 *
521 * "Call" register usage:
522 * a0 This value, OPTEE_SMC_RETURN_RPC_FREE
523 * a1 Upper 32 bits of 64-bit shared memory cookie belonging to this
524 * argument memory
525 * a2 Lower 32 bits of 64-bit shared memory cookie belonging to this
526 * argument memory
527 * a3-7 Resume information, must be preserved
528 *
529 * "Return" register usage:
530 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
531 * a1-2 Not used
532 * a3-7 Preserved
533 */
534 #define OPTEE_SMC_RPC_FUNC_FREE 2
535 #define OPTEE_SMC_RETURN_RPC_FREE \
536 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FREE)
537
538 /*
539 * Deliver a foreign interrupt in normal world.
540 *
541 * "Call" register usage:
542 * a0 OPTEE_SMC_RETURN_RPC_FOREIGN_INTR
543 * a1-7 Resume information, must be preserved
544 *
545 * "Return" register usage:
546 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
547 * a1-7 Preserved
548 */
549 #define OPTEE_SMC_RPC_FUNC_FOREIGN_INTR 4
550 #define OPTEE_SMC_RETURN_RPC_FOREIGN_INTR \
551 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FOREIGN_INTR)
552
553 /*
554 * Do an RPC request. The supplied struct optee_msg_arg tells which
555 * request to do and the parameters for the request. The following fields
556 * are used (the rest are unused):
557 * - cmd the Request ID
558 * - ret return value of the request, filled in by normal world
559 * - num_params number of parameters for the request
560 * - params the parameters
561 * - param_attrs attributes of the parameters
562 *
563 * "Call" register usage:
564 * a0 OPTEE_SMC_RETURN_RPC_CMD
565 * a1 Upper 32 bits of a 64-bit Shared memory cookie holding a
566 * struct optee_msg_arg, must be preserved, only the data should
567 * be updated
568 * a2 Lower 32 bits of a 64-bit Shared memory cookie holding a
569 * struct optee_msg_arg, must be preserved, only the data should
570 * be updated
571 * a3-7 Resume information, must be preserved
572 *
573 * "Return" register usage:
574 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
575 * a1-2 Not used
576 * a3-7 Preserved
577 */
578 #define OPTEE_SMC_RPC_FUNC_CMD 5
579 #define OPTEE_SMC_RETURN_RPC_CMD \
580 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_CMD)
581
582 /* Returned in a0 */
583 #define OPTEE_SMC_RETURN_UNKNOWN_FUNCTION 0xFFFFFFFF
584
585 /* Returned in a0 only from Trusted OS functions */
586 #define OPTEE_SMC_RETURN_OK 0x0
587 #define OPTEE_SMC_RETURN_ETHREAD_LIMIT 0x1
588 #define OPTEE_SMC_RETURN_EBUSY 0x2
589 #define OPTEE_SMC_RETURN_ERESUME 0x3
590 #define OPTEE_SMC_RETURN_EBADADDR 0x4
591 #define OPTEE_SMC_RETURN_EBADCMD 0x5
592 #define OPTEE_SMC_RETURN_ENOMEM 0x6
593 #define OPTEE_SMC_RETURN_ENOTAVAIL 0x7
594 #define OPTEE_SMC_RETURN_IS_RPC(ret) __optee_smc_return_is_rpc((ret))
595
__optee_smc_return_is_rpc(u32 ret)596 static inline bool __optee_smc_return_is_rpc(u32 ret)
597 {
598 return ret != OPTEE_SMC_RETURN_UNKNOWN_FUNCTION &&
599 (ret & OPTEE_SMC_RETURN_RPC_PREFIX_MASK) ==
600 OPTEE_SMC_RETURN_RPC_PREFIX;
601 }
602
603 #endif /* OPTEE_SMC_H */
604