summaryrefslogtreecommitdiff
path: root/drivers/tee/optee/optee_smc.h
blob: 069c8e1429de8d2aaeb57e1cc51df58293d1d932 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
/*
 * Copyright (c) 2015-2016, Linaro Limited
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef OPTEE_SMC_H
#define OPTEE_SMC_H

#include <linux/arm-smccc.h>
#include <linux/bitops.h>

#define OPTEE_SMC_STD_CALL_VAL(func_num) \
	ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
			   ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
#define OPTEE_SMC_FAST_CALL_VAL(func_num) \
	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
			   ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))

/*
 * Function specified by SMC Calling convention.
 */
#define OPTEE_SMC_FUNCID_CALLS_COUNT	0xFF00
#define OPTEE_SMC_CALLS_COUNT \
	ARM_SMCCC_CALL_VAL(OPTEE_SMC_FAST_CALL, SMCCC_SMC_32, \
			   SMCCC_OWNER_TRUSTED_OS_END, \
			   OPTEE_SMC_FUNCID_CALLS_COUNT)

/*
 * Normal cached memory (write-back), shareable for SMP systems and not
 * shareable for UP systems.
 */
#define OPTEE_SMC_SHM_CACHED		1

/*
 * a0..a7 is used as register names in the descriptions below, on arm32
 * that translates to r0..r7 and on arm64 to w0..w7. In both cases it's
 * 32-bit registers.
 */

/*
 * Function specified by SMC Calling convention
 *
 * Return one of the following UIDs if using API specified in this file
 * without further extentions:
 * 65cb6b93-af0c-4617-8ed6-644a8d1140f8
 * see also OPTEE_SMC_UID_* in optee_msg.h
 */
#define OPTEE_SMC_FUNCID_CALLS_UID OPTEE_MSG_FUNCID_CALLS_UID
#define OPTEE_SMC_CALLS_UID \
	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
			   ARM_SMCCC_OWNER_TRUSTED_OS_END, \
			   OPTEE_SMC_FUNCID_CALLS_UID)

/*
 * Function specified by SMC Calling convention
 *
 * Returns 2.0 if using API specified in this file without further extentions.
 * see also OPTEE_MSG_REVISION_* in optee_msg.h
 */
#define OPTEE_SMC_FUNCID_CALLS_REVISION OPTEE_MSG_FUNCID_CALLS_REVISION
#define OPTEE_SMC_CALLS_REVISION \
	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
			   ARM_SMCCC_OWNER_TRUSTED_OS_END, \
			   OPTEE_SMC_FUNCID_CALLS_REVISION)

struct optee_smc_calls_revision_result {
	unsigned long major;
	unsigned long minor;
	unsigned long reserved0;
	unsigned long reserved1;
};

/*
 * Get UUID of Trusted OS.
 *
 * Used by non-secure world to figure out which Trusted OS is installed.
 * Note that returned UUID is the UUID of the Trusted OS, not of the API.
 *
 * Returns UUID in a0-4 in the same way as OPTEE_SMC_CALLS_UID
 * described above.
 */
#define OPTEE_SMC_FUNCID_GET_OS_UUID OPTEE_MSG_FUNCID_GET_OS_UUID
#define OPTEE_SMC_CALL_GET_OS_UUID \
	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_UUID)

/*
 * Get revision of Trusted OS.
 *
 * Used by non-secure world to figure out which version of the Trusted OS
 * is installed. Note that the returned revision is the revision of the
 * Trusted OS, not of the API.
 *
 * Returns revision in a0-1 in the same way as OPTEE_SMC_CALLS_REVISION
 * described above.
 */
#define OPTEE_SMC_FUNCID_GET_OS_REVISION OPTEE_MSG_FUNCID_GET_OS_REVISION
#define OPTEE_SMC_CALL_GET_OS_REVISION \
	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_REVISION)

/*
 * Call with struct optee_msg_arg as argument
 *
 * Call register usage:
 * a0	SMC Function ID, OPTEE_SMC*CALL_WITH_ARG
 * a1	Upper 32bit of a 64bit physical pointer to a struct optee_msg_arg
 * a2	Lower 32bit of a 64bit physical pointer to a struct optee_msg_arg
 * a3	Cache settings, not used if physical pointer is in a predefined shared
 *	memory area else per OPTEE_SMC_SHM_*
 * a4-6	Not used
 * a7	Hypervisor Client ID register
 *
 * Normal return register usage:
 * a0	Return value, OPTEE_SMC_RETURN_*
 * a1-3	Not used
 * a4-7	Preserved
 *
 * OPTEE_SMC_RETURN_ETHREAD_LIMIT return register usage:
 * a0	Return value, OPTEE_SMC_RETURN_ETHREAD_LIMIT
 * a1-3	Preserved
 * a4-7	Preserved
 *
 * RPC return register usage:
 * a0	Return value, OPTEE_SMC_RETURN_IS_RPC(val)
 * a1-2	RPC parameters
 * a3-7	Resume information, must be preserved
 *
 * Possible return values:
 * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION	Trusted OS does not recognize this
 *					function.
 * OPTEE_SMC_RETURN_OK			Call completed, result updated in
 *					the previously supplied struct
 *					optee_msg_arg.
 * OPTEE_SMC_RETURN_ETHREAD_LIMIT	Number of Trusted OS threads exceeded,
 *					try again later.
 * OPTEE_SMC_RETURN_EBADADDR		Bad physcial pointer to struct
 *					optee_msg_arg.
 * OPTEE_SMC_RETURN_EBADCMD		Bad/unknown cmd in struct optee_msg_arg
 * OPTEE_SMC_RETURN_IS_RPC()		Call suspended by RPC call to normal
 *					world.
 */
#define OPTEE_SMC_FUNCID_CALL_WITH_ARG OPTEE_MSG_FUNCID_CALL_WITH_ARG
#define OPTEE_SMC_CALL_WITH_ARG \
	OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_ARG)

/*
 * Get Shared Memory Config
 *
 * Returns the Secure/Non-secure shared memory config.
 *
 * Call register usage:
 * a0	SMC Function ID, OPTEE_SMC_GET_SHM_CONFIG
 * a1-6	Not used
 * a7	Hypervisor Client ID register
 *
 * Have config return register usage:
 * a0	OPTEE_SMC_RETURN_OK
 * a1	Physical address of start of SHM
 * a2	Size of of SHM
 * a3	Cache settings of memory, as defined by the
 *	OPTEE_SMC_SHM_* values above
 * a4-7	Preserved
 *
 * Not available register usage:
 * a0	OPTEE_SMC_RETURN_ENOTAVAIL
 * a1-3 Not used
 * a4-7	Preserved
 */
#define OPTEE_SMC_FUNCID_GET_SHM_CONFIG	7
#define OPTEE_SMC_GET_SHM_CONFIG \
	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SHM_CONFIG)

struct optee_smc_get_shm_config_result {
	unsigned long status;
	unsigned long start;
	unsigned long size;
	unsigned long settings;
};

/*
 * Exchanges capabilities between normal world and secure world
 *
 * Call register usage:
 * a0	SMC Function ID, OPTEE_SMC_EXCHANGE_CAPABILITIES
 * a1	bitfield of normal world capabilities OPTEE_SMC_NSEC_CAP_*
 * a2-6	Not used
 * a7	Hypervisor Client ID register
 *
 * Normal return register usage:
 * a0	OPTEE_SMC_RETURN_OK
 * a1	bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
 * a2-7	Preserved
 *
 * Error return register usage:
 * a0	OPTEE_SMC_RETURN_ENOTAVAIL, can't use the capabilities from normal world
 * a1	bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
 * a2-7 Preserved
 */
/* Normal world works as a uniprocessor system */
#define OPTEE_SMC_NSEC_CAP_UNIPROCESSOR		BIT(0)
/* Secure world has reserved shared memory for normal world to use */
#define OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM	BIT(0)
/* Secure world can communicate via previously unregistered shared memory */
#define OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM	BIT(1)
#define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES	9
#define OPTEE_SMC_EXCHANGE_CAPABILITIES \
	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES)

struct optee_smc_exchange_capabilities_result {
	unsigned long status;
	unsigned long capabilities;
	unsigned long reserved0;
	unsigned long reserved1;
};

/*
 * Disable and empties cache of shared memory objects
 *
 * Secure world can cache frequently used shared memory objects, for
 * example objects used as RPC arguments. When secure world is idle this
 * function returns one shared memory reference to free. To disable the
 * cache and free all cached objects this function has to be called until
 * it returns OPTEE_SMC_RETURN_ENOTAVAIL.
 *
 * Call register usage:
 * a0	SMC Function ID, OPTEE_SMC_DISABLE_SHM_CACHE
 * a1-6	Not used
 * a7	Hypervisor Client ID register
 *
 * Normal return register usage:
 * a0	OPTEE_SMC_RETURN_OK
 * a1	Upper 32bit of a 64bit Shared memory cookie
 * a2	Lower 32bit of a 64bit Shared memory cookie
 * a3-7	Preserved
 *
 * Cache empty return register usage:
 * a0	OPTEE_SMC_RETURN_ENOTAVAIL
 * a1-7	Preserved
 *
 * Not idle return register usage:
 * a0	OPTEE_SMC_RETURN_EBUSY
 * a1-7	Preserved
 */
#define OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE	10
#define OPTEE_SMC_DISABLE_SHM_CACHE \
	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE)

struct optee_smc_disable_shm_cache_result {
	unsigned long status;
	unsigned long shm_upper32;
	unsigned long shm_lower32;
	unsigned long reserved0;
};

/*
 * Enable cache of shared memory objects
 *
 * Secure world can cache frequently used shared memory objects, for
 * example objects used as RPC arguments. When secure world is idle this
 * function returns OPTEE_SMC_RETURN_OK and the cache is enabled. If
 * secure world isn't idle OPTEE_SMC_RETURN_EBUSY is returned.
 *
 * Call register usage:
 * a0	SMC Function ID, OPTEE_SMC_ENABLE_SHM_CACHE
 * a1-6	Not used
 * a7	Hypervisor Client ID register
 *
 * Normal return register usage:
 * a0	OPTEE_SMC_RETURN_OK
 * a1-7	Preserved
 *
 * Not idle return register usage:
 * a0	OPTEE_SMC_RETURN_EBUSY
 * a1-7	Preserved
 */
#define OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE	11
#define OPTEE_SMC_ENABLE_SHM_CACHE \
	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE)

/*
 * Resume from RPC (for example after processing a foreign interrupt)
 *
 * Call register usage:
 * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC
 * a1-3	Value of a1-3 when OPTEE_SMC_CALL_WITH_ARG returned
 *	OPTEE_SMC_RETURN_RPC in a0
 *
 * Return register usage is the same as for OPTEE_SMC_*CALL_WITH_ARG above.
 *
 * Possible return values
 * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION	Trusted OS does not recognize this
 *					function.
 * OPTEE_SMC_RETURN_OK			Original call completed, result
 *					updated in the previously supplied.
 *					struct optee_msg_arg
 * OPTEE_SMC_RETURN_RPC			Call suspended by RPC call to normal
 *					world.
 * OPTEE_SMC_RETURN_ERESUME		Resume failed, the opaque resume
 *					information was corrupt.
 */
#define OPTEE_SMC_FUNCID_RETURN_FROM_RPC	3
#define OPTEE_SMC_CALL_RETURN_FROM_RPC \
	OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_RETURN_FROM_RPC)

#define OPTEE_SMC_RETURN_RPC_PREFIX_MASK	0xFFFF0000
#define OPTEE_SMC_RETURN_RPC_PREFIX		0xFFFF0000
#define OPTEE_SMC_RETURN_RPC_FUNC_MASK		0x0000FFFF

#define OPTEE_SMC_RETURN_GET_RPC_FUNC(ret) \
	((ret) & OPTEE_SMC_RETURN_RPC_FUNC_MASK)

#define OPTEE_SMC_RPC_VAL(func)		((func) | OPTEE_SMC_RETURN_RPC_PREFIX)

/*
 * Allocate memory for RPC parameter passing. The memory is used to hold a
 * struct optee_msg_arg.
 *
 * "Call" register usage:
 * a0	This value, OPTEE_SMC_RETURN_RPC_ALLOC
 * a1	Size in bytes of required argument memory
 * a2	Not used
 * a3	Resume information, must be preserved
 * a4-5	Not used
 * a6-7	Resume information, must be preserved
 *
 * "Return" register usage:
 * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
 * a1	Upper 32bits of 64bit physical pointer to allocated
 *	memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
 *	be allocated.
 * a2	Lower 32bits of 64bit physical pointer to allocated
 *	memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
 *	be allocated
 * a3	Preserved
 * a4	Upper 32bits of 64bit Shared memory cookie used when freeing
 *	the memory or doing an RPC
 * a5	Lower 32bits of 64bit Shared memory cookie used when freeing
 *	the memory or doing an RPC
 * a6-7	Preserved
 */
#define OPTEE_SMC_RPC_FUNC_ALLOC	0
#define OPTEE_SMC_RETURN_RPC_ALLOC \
	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_ALLOC)

/*
 * Free memory previously allocated by OPTEE_SMC_RETURN_RPC_ALLOC
 *
 * "Call" register usage:
 * a0	This value, OPTEE_SMC_RETURN_RPC_FREE
 * a1	Upper 32bits of 64bit shared memory cookie belonging to this
 *	argument memory
 * a2	Lower 32bits of 64bit shared memory cookie belonging to this
 *	argument memory
 * a3-7	Resume information, must be preserved
 *
 * "Return" register usage:
 * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
 * a1-2	Not used
 * a3-7	Preserved
 */
#define OPTEE_SMC_RPC_FUNC_FREE		2
#define OPTEE_SMC_RETURN_RPC_FREE \
	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FREE)

/*
 * Deliver foreign interrupt to normal world.
 *
 * "Call" register usage:
 * a0	OPTEE_SMC_RETURN_RPC_FOREIGN_INTR
 * a1-7	Resume information, must be preserved
 *
 * "Return" register usage:
 * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
 * a1-7	Preserved
 */
#define OPTEE_SMC_RPC_FUNC_FOREIGN_INTR		4
#define OPTEE_SMC_RETURN_RPC_FOREIGN_INTR \
	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FOREIGN_INTR)

/*
 * Do an RPC request. The supplied struct optee_msg_arg tells which
 * request to do and the parameters for the request. The following fields
 * are used (the rest are unused):
 * - cmd		the Request ID
 * - ret		return value of the request, filled in by normal world
 * - num_params		number of parameters for the request
 * - params		the parameters
 * - param_attrs	attributes of the parameters
 *
 * "Call" register usage:
 * a0	OPTEE_SMC_RETURN_RPC_CMD
 * a1	Upper 32bit of a 64bit Shared memory cookie holding a
 *	struct optee_msg_arg, must be preserved, only the data should
 *	be updated
 * a2	Lower 32bit of a 64bit Shared memory cookie holding a
 *	struct optee_msg_arg, must be preserved, only the data should
 *	be updated
 * a3-7	Resume information, must be preserved
 *
 * "Return" register usage:
 * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
 * a1-2	Not used
 * a3-7	Preserved
 */
#define OPTEE_SMC_RPC_FUNC_CMD		5
#define OPTEE_SMC_RETURN_RPC_CMD \
	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_CMD)

/* Returned in a0 */
#define OPTEE_SMC_RETURN_UNKNOWN_FUNCTION 0xFFFFFFFF

/* Returned in a0 only from Trusted OS functions */
#define OPTEE_SMC_RETURN_OK		0x0
#define OPTEE_SMC_RETURN_ETHREAD_LIMIT	0x1
#define OPTEE_SMC_RETURN_EBUSY		0x2
#define OPTEE_SMC_RETURN_ERESUME	0x3
#define OPTEE_SMC_RETURN_EBADADDR	0x4
#define OPTEE_SMC_RETURN_EBADCMD	0x5
#define OPTEE_SMC_RETURN_ENOMEM		0x6
#define OPTEE_SMC_RETURN_ENOTAVAIL	0x7
#define OPTEE_SMC_RETURN_IS_RPC(ret)	__optee_smc_return_is_rpc((ret))

static inline bool __optee_smc_return_is_rpc(u32 ret)
{
	return ret != OPTEE_SMC_RETURN_UNKNOWN_FUNCTION &&
	       (ret & OPTEE_SMC_RETURN_RPC_PREFIX_MASK) ==
			OPTEE_SMC_RETURN_RPC_PREFIX;
}

#endif /* OPTEE_SMC_H */