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1/*
2 * Copyright (c) 2015-2016, Linaro Limited
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27#ifndef OPTEE_SMC_H
28#define OPTEE_SMC_H
29
30#include <linux/arm-smccc.h>
31#include <linux/bitops.h>
32
33#define OPTEE_SMC_STD_CALL_VAL(func_num) \
34 ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
35 ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
36#define OPTEE_SMC_FAST_CALL_VAL(func_num) \
37 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
38 ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
39
40/*
41 * Function specified by SMC Calling convention.
42 */
43#define OPTEE_SMC_FUNCID_CALLS_COUNT 0xFF00
44#define OPTEE_SMC_CALLS_COUNT \
45 ARM_SMCCC_CALL_VAL(OPTEE_SMC_FAST_CALL, SMCCC_SMC_32, \
46 SMCCC_OWNER_TRUSTED_OS_END, \
47 OPTEE_SMC_FUNCID_CALLS_COUNT)
48
49/*
50 * Normal cached memory (write-back), shareable for SMP systems and not
51 * shareable for UP systems.
52 */
53#define OPTEE_SMC_SHM_CACHED 1
54
55/*
56 * a0..a7 is used as register names in the descriptions below, on arm32
57 * that translates to r0..r7 and on arm64 to w0..w7. In both cases it's
58 * 32-bit registers.
59 */
60
61/*
62 * Function specified by SMC Calling convention
63 *
64 * Return one of the following UIDs if using API specified in this file
65 * without further extentions:
66 * 65cb6b93-af0c-4617-8ed6-644a8d1140f8
67 * see also OPTEE_SMC_UID_* in optee_msg.h
68 */
69#define OPTEE_SMC_FUNCID_CALLS_UID OPTEE_MSG_FUNCID_CALLS_UID
70#define OPTEE_SMC_CALLS_UID \
71 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
72 ARM_SMCCC_OWNER_TRUSTED_OS_END, \
73 OPTEE_SMC_FUNCID_CALLS_UID)
74
75/*
76 * Function specified by SMC Calling convention
77 *
78 * Returns 2.0 if using API specified in this file without further extentions.
79 * see also OPTEE_MSG_REVISION_* in optee_msg.h
80 */
81#define OPTEE_SMC_FUNCID_CALLS_REVISION OPTEE_MSG_FUNCID_CALLS_REVISION
82#define OPTEE_SMC_CALLS_REVISION \
83 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
84 ARM_SMCCC_OWNER_TRUSTED_OS_END, \
85 OPTEE_SMC_FUNCID_CALLS_REVISION)
86
87struct optee_smc_calls_revision_result {
88 unsigned long major;
89 unsigned long minor;
90 unsigned long reserved0;
91 unsigned long reserved1;
92};
93
94/*
95 * Get UUID of Trusted OS.
96 *
97 * Used by non-secure world to figure out which Trusted OS is installed.
98 * Note that returned UUID is the UUID of the Trusted OS, not of the API.
99 *
100 * Returns UUID in a0-4 in the same way as OPTEE_SMC_CALLS_UID
101 * described above.
102 */
103#define OPTEE_SMC_FUNCID_GET_OS_UUID OPTEE_MSG_FUNCID_GET_OS_UUID
104#define OPTEE_SMC_CALL_GET_OS_UUID \
105 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_UUID)
106
107/*
108 * Get revision of Trusted OS.
109 *
110 * Used by non-secure world to figure out which version of the Trusted OS
111 * is installed. Note that the returned revision is the revision of the
112 * Trusted OS, not of the API.
113 *
114 * Returns revision in a0-1 in the same way as OPTEE_SMC_CALLS_REVISION
115 * described above. May optionally return a 32-bit build identifier in a2,
116 * with zero meaning unspecified.
117 */
118#define OPTEE_SMC_FUNCID_GET_OS_REVISION OPTEE_MSG_FUNCID_GET_OS_REVISION
119#define OPTEE_SMC_CALL_GET_OS_REVISION \
120 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_REVISION)
121
122struct optee_smc_call_get_os_revision_result {
123 unsigned long major;
124 unsigned long minor;
125 unsigned long build_id;
126 unsigned long reserved1;
127};
128
129/*
130 * Call with struct optee_msg_arg as argument
131 *
132 * Call register usage:
133 * a0 SMC Function ID, OPTEE_SMC*CALL_WITH_ARG
134 * a1 Upper 32bit of a 64bit physical pointer to a struct optee_msg_arg
135 * a2 Lower 32bit of a 64bit physical pointer to a struct optee_msg_arg
136 * a3 Cache settings, not used if physical pointer is in a predefined shared
137 * memory area else per OPTEE_SMC_SHM_*
138 * a4-6 Not used
139 * a7 Hypervisor Client ID register
140 *
141 * Normal return register usage:
142 * a0 Return value, OPTEE_SMC_RETURN_*
143 * a1-3 Not used
144 * a4-7 Preserved
145 *
146 * OPTEE_SMC_RETURN_ETHREAD_LIMIT return register usage:
147 * a0 Return value, OPTEE_SMC_RETURN_ETHREAD_LIMIT
148 * a1-3 Preserved
149 * a4-7 Preserved
150 *
151 * RPC return register usage:
152 * a0 Return value, OPTEE_SMC_RETURN_IS_RPC(val)
153 * a1-2 RPC parameters
154 * a3-7 Resume information, must be preserved
155 *
156 * Possible return values:
157 * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this
158 * function.
159 * OPTEE_SMC_RETURN_OK Call completed, result updated in
160 * the previously supplied struct
161 * optee_msg_arg.
162 * OPTEE_SMC_RETURN_ETHREAD_LIMIT Number of Trusted OS threads exceeded,
163 * try again later.
164 * OPTEE_SMC_RETURN_EBADADDR Bad physcial pointer to struct
165 * optee_msg_arg.
166 * OPTEE_SMC_RETURN_EBADCMD Bad/unknown cmd in struct optee_msg_arg
167 * OPTEE_SMC_RETURN_IS_RPC() Call suspended by RPC call to normal
168 * world.
169 */
170#define OPTEE_SMC_FUNCID_CALL_WITH_ARG OPTEE_MSG_FUNCID_CALL_WITH_ARG
171#define OPTEE_SMC_CALL_WITH_ARG \
172 OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_ARG)
173
174/*
175 * Get Shared Memory Config
176 *
177 * Returns the Secure/Non-secure shared memory config.
178 *
179 * Call register usage:
180 * a0 SMC Function ID, OPTEE_SMC_GET_SHM_CONFIG
181 * a1-6 Not used
182 * a7 Hypervisor Client ID register
183 *
184 * Have config return register usage:
185 * a0 OPTEE_SMC_RETURN_OK
186 * a1 Physical address of start of SHM
187 * a2 Size of of SHM
188 * a3 Cache settings of memory, as defined by the
189 * OPTEE_SMC_SHM_* values above
190 * a4-7 Preserved
191 *
192 * Not available register usage:
193 * a0 OPTEE_SMC_RETURN_ENOTAVAIL
194 * a1-3 Not used
195 * a4-7 Preserved
196 */
197#define OPTEE_SMC_FUNCID_GET_SHM_CONFIG 7
198#define OPTEE_SMC_GET_SHM_CONFIG \
199 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SHM_CONFIG)
200
201struct optee_smc_get_shm_config_result {
202 unsigned long status;
203 unsigned long start;
204 unsigned long size;
205 unsigned long settings;
206};
207
208/*
209 * Exchanges capabilities between normal world and secure world
210 *
211 * Call register usage:
212 * a0 SMC Function ID, OPTEE_SMC_EXCHANGE_CAPABILITIES
213 * a1 bitfield of normal world capabilities OPTEE_SMC_NSEC_CAP_*
214 * a2-6 Not used
215 * a7 Hypervisor Client ID register
216 *
217 * Normal return register usage:
218 * a0 OPTEE_SMC_RETURN_OK
219 * a1 bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
220 * a2-7 Preserved
221 *
222 * Error return register usage:
223 * a0 OPTEE_SMC_RETURN_ENOTAVAIL, can't use the capabilities from normal world
224 * a1 bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
225 * a2-7 Preserved
226 */
227/* Normal world works as a uniprocessor system */
228#define OPTEE_SMC_NSEC_CAP_UNIPROCESSOR BIT(0)
229/* Secure world has reserved shared memory for normal world to use */
230#define OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM BIT(0)
231/* Secure world can communicate via previously unregistered shared memory */
232#define OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM BIT(1)
233
234/*
235 * Secure world supports commands "register/unregister shared memory",
236 * secure world accepts command buffers located in any parts of non-secure RAM
237 */
238#define OPTEE_SMC_SEC_CAP_DYNAMIC_SHM BIT(2)
239
240#define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9
241#define OPTEE_SMC_EXCHANGE_CAPABILITIES \
242 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES)
243
244struct optee_smc_exchange_capabilities_result {
245 unsigned long status;
246 unsigned long capabilities;
247 unsigned long reserved0;
248 unsigned long reserved1;
249};
250
251/*
252 * Disable and empties cache of shared memory objects
253 *
254 * Secure world can cache frequently used shared memory objects, for
255 * example objects used as RPC arguments. When secure world is idle this
256 * function returns one shared memory reference to free. To disable the
257 * cache and free all cached objects this function has to be called until
258 * it returns OPTEE_SMC_RETURN_ENOTAVAIL.
259 *
260 * Call register usage:
261 * a0 SMC Function ID, OPTEE_SMC_DISABLE_SHM_CACHE
262 * a1-6 Not used
263 * a7 Hypervisor Client ID register
264 *
265 * Normal return register usage:
266 * a0 OPTEE_SMC_RETURN_OK
267 * a1 Upper 32bit of a 64bit Shared memory cookie
268 * a2 Lower 32bit of a 64bit Shared memory cookie
269 * a3-7 Preserved
270 *
271 * Cache empty return register usage:
272 * a0 OPTEE_SMC_RETURN_ENOTAVAIL
273 * a1-7 Preserved
274 *
275 * Not idle return register usage:
276 * a0 OPTEE_SMC_RETURN_EBUSY
277 * a1-7 Preserved
278 */
279#define OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE 10
280#define OPTEE_SMC_DISABLE_SHM_CACHE \
281 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE)
282
283struct optee_smc_disable_shm_cache_result {
284 unsigned long status;
285 unsigned long shm_upper32;
286 unsigned long shm_lower32;
287 unsigned long reserved0;
288};
289
290/*
291 * Enable cache of shared memory objects
292 *
293 * Secure world can cache frequently used shared memory objects, for
294 * example objects used as RPC arguments. When secure world is idle this
295 * function returns OPTEE_SMC_RETURN_OK and the cache is enabled. If
296 * secure world isn't idle OPTEE_SMC_RETURN_EBUSY is returned.
297 *
298 * Call register usage:
299 * a0 SMC Function ID, OPTEE_SMC_ENABLE_SHM_CACHE
300 * a1-6 Not used
301 * a7 Hypervisor Client ID register
302 *
303 * Normal return register usage:
304 * a0 OPTEE_SMC_RETURN_OK
305 * a1-7 Preserved
306 *
307 * Not idle return register usage:
308 * a0 OPTEE_SMC_RETURN_EBUSY
309 * a1-7 Preserved
310 */
311#define OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE 11
312#define OPTEE_SMC_ENABLE_SHM_CACHE \
313 OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE)
314
315/*
316 * Resume from RPC (for example after processing a foreign interrupt)
317 *
318 * Call register usage:
319 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC
320 * a1-3 Value of a1-3 when OPTEE_SMC_CALL_WITH_ARG returned
321 * OPTEE_SMC_RETURN_RPC in a0
322 *
323 * Return register usage is the same as for OPTEE_SMC_*CALL_WITH_ARG above.
324 *
325 * Possible return values
326 * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this
327 * function.
328 * OPTEE_SMC_RETURN_OK Original call completed, result
329 * updated in the previously supplied.
330 * struct optee_msg_arg
331 * OPTEE_SMC_RETURN_RPC Call suspended by RPC call to normal
332 * world.
333 * OPTEE_SMC_RETURN_ERESUME Resume failed, the opaque resume
334 * information was corrupt.
335 */
336#define OPTEE_SMC_FUNCID_RETURN_FROM_RPC 3
337#define OPTEE_SMC_CALL_RETURN_FROM_RPC \
338 OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_RETURN_FROM_RPC)
339
340#define OPTEE_SMC_RETURN_RPC_PREFIX_MASK 0xFFFF0000
341#define OPTEE_SMC_RETURN_RPC_PREFIX 0xFFFF0000
342#define OPTEE_SMC_RETURN_RPC_FUNC_MASK 0x0000FFFF
343
344#define OPTEE_SMC_RETURN_GET_RPC_FUNC(ret) \
345 ((ret) & OPTEE_SMC_RETURN_RPC_FUNC_MASK)
346
347#define OPTEE_SMC_RPC_VAL(func) ((func) | OPTEE_SMC_RETURN_RPC_PREFIX)
348
349/*
350 * Allocate memory for RPC parameter passing. The memory is used to hold a
351 * struct optee_msg_arg.
352 *
353 * "Call" register usage:
354 * a0 This value, OPTEE_SMC_RETURN_RPC_ALLOC
355 * a1 Size in bytes of required argument memory
356 * a2 Not used
357 * a3 Resume information, must be preserved
358 * a4-5 Not used
359 * a6-7 Resume information, must be preserved
360 *
361 * "Return" register usage:
362 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
363 * a1 Upper 32bits of 64bit physical pointer to allocated
364 * memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
365 * be allocated.
366 * a2 Lower 32bits of 64bit physical pointer to allocated
367 * memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
368 * be allocated
369 * a3 Preserved
370 * a4 Upper 32bits of 64bit Shared memory cookie used when freeing
371 * the memory or doing an RPC
372 * a5 Lower 32bits of 64bit Shared memory cookie used when freeing
373 * the memory or doing an RPC
374 * a6-7 Preserved
375 */
376#define OPTEE_SMC_RPC_FUNC_ALLOC 0
377#define OPTEE_SMC_RETURN_RPC_ALLOC \
378 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_ALLOC)
379
380/*
381 * Free memory previously allocated by OPTEE_SMC_RETURN_RPC_ALLOC
382 *
383 * "Call" register usage:
384 * a0 This value, OPTEE_SMC_RETURN_RPC_FREE
385 * a1 Upper 32bits of 64bit shared memory cookie belonging to this
386 * argument memory
387 * a2 Lower 32bits of 64bit shared memory cookie belonging to this
388 * argument memory
389 * a3-7 Resume information, must be preserved
390 *
391 * "Return" register usage:
392 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
393 * a1-2 Not used
394 * a3-7 Preserved
395 */
396#define OPTEE_SMC_RPC_FUNC_FREE 2
397#define OPTEE_SMC_RETURN_RPC_FREE \
398 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FREE)
399
400/*
401 * Deliver foreign interrupt to normal world.
402 *
403 * "Call" register usage:
404 * a0 OPTEE_SMC_RETURN_RPC_FOREIGN_INTR
405 * a1-7 Resume information, must be preserved
406 *
407 * "Return" register usage:
408 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
409 * a1-7 Preserved
410 */
411#define OPTEE_SMC_RPC_FUNC_FOREIGN_INTR 4
412#define OPTEE_SMC_RETURN_RPC_FOREIGN_INTR \
413 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FOREIGN_INTR)
414
415/*
416 * Do an RPC request. The supplied struct optee_msg_arg tells which
417 * request to do and the parameters for the request. The following fields
418 * are used (the rest are unused):
419 * - cmd the Request ID
420 * - ret return value of the request, filled in by normal world
421 * - num_params number of parameters for the request
422 * - params the parameters
423 * - param_attrs attributes of the parameters
424 *
425 * "Call" register usage:
426 * a0 OPTEE_SMC_RETURN_RPC_CMD
427 * a1 Upper 32bit of a 64bit Shared memory cookie holding a
428 * struct optee_msg_arg, must be preserved, only the data should
429 * be updated
430 * a2 Lower 32bit of a 64bit Shared memory cookie holding a
431 * struct optee_msg_arg, must be preserved, only the data should
432 * be updated
433 * a3-7 Resume information, must be preserved
434 *
435 * "Return" register usage:
436 * a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
437 * a1-2 Not used
438 * a3-7 Preserved
439 */
440#define OPTEE_SMC_RPC_FUNC_CMD 5
441#define OPTEE_SMC_RETURN_RPC_CMD \
442 OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_CMD)
443
444/* Returned in a0 */
445#define OPTEE_SMC_RETURN_UNKNOWN_FUNCTION 0xFFFFFFFF
446
447/* Returned in a0 only from Trusted OS functions */
448#define OPTEE_SMC_RETURN_OK 0x0
449#define OPTEE_SMC_RETURN_ETHREAD_LIMIT 0x1
450#define OPTEE_SMC_RETURN_EBUSY 0x2
451#define OPTEE_SMC_RETURN_ERESUME 0x3
452#define OPTEE_SMC_RETURN_EBADADDR 0x4
453#define OPTEE_SMC_RETURN_EBADCMD 0x5
454#define OPTEE_SMC_RETURN_ENOMEM 0x6
455#define OPTEE_SMC_RETURN_ENOTAVAIL 0x7
456#define OPTEE_SMC_RETURN_IS_RPC(ret) __optee_smc_return_is_rpc((ret))
457
458static inline bool __optee_smc_return_is_rpc(u32 ret)
459{
460 return ret != OPTEE_SMC_RETURN_UNKNOWN_FUNCTION &&
461 (ret & OPTEE_SMC_RETURN_RPC_PREFIX_MASK) ==
462 OPTEE_SMC_RETURN_RPC_PREFIX;
463}
464
465#endif /* OPTEE_SMC_H */