include/tee.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (c) 2018 Linaro Limited
   4  */
   5
   6 #ifndef __TEE_H
   7 #define __TEE_H
   8
   9 #define TEE_UUID_LEN            16
  10
  11 #define TEE_GEN_CAP_GP          BIT(0)  /* GlobalPlatform compliant TEE */
  12 #define TEE_GEN_CAP_REG_MEM     BIT(1)  /* Supports registering shared memory */
  13
  14 #define TEE_SHM_REGISTER        BIT(0)  /* In list of shared memory */
  15 #define TEE_SHM_SEC_REGISTER    BIT(1)  /* TEE notified of this memory */
  16 #define TEE_SHM_ALLOC           BIT(2)  /* The memory is malloced() and must */
  17                                         /* be freed() */
  18
  19 #define TEE_PARAM_ATTR_TYPE_NONE                0       /* parameter not used */
  20 #define TEE_PARAM_ATTR_TYPE_VALUE_INPUT         1
  21 #define TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT        2
  22 #define TEE_PARAM_ATTR_TYPE_VALUE_INOUT         3       /* input and output */
  23 #define TEE_PARAM_ATTR_TYPE_MEMREF_INPUT        5
  24 #define TEE_PARAM_ATTR_TYPE_MEMREF_OUTPUT       6
  25 #define TEE_PARAM_ATTR_TYPE_MEMREF_INOUT        7       /* input and output */
  26 #define TEE_PARAM_ATTR_TYPE_MASK                0xff
  27 #define TEE_PARAM_ATTR_META                     0x100
  28 #define TEE_PARAM_ATTR_MASK                     (TEE_PARAM_ATTR_TYPE_MASK | \
  29                                                  TEE_PARAM_ATTR_META)
  30
  31 /*
  32  * Some Global Platform error codes which has a meaning if the
  33  * TEE_GEN_CAP_GP bit is returned by the driver in
  34  * struct tee_version_data::gen_caps
  35  */
  36 #define TEE_SUCCESS                     0x00000000
  37 #define TEE_ERROR_GENERIC               0xffff0000
  38 #define TEE_ERROR_BAD_PARAMETERS        0xffff0006
  39 #define TEE_ERROR_ITEM_NOT_FOUND        0xffff0008
  40 #define TEE_ERROR_NOT_IMPLEMENTED       0xffff0009
  41 #define TEE_ERROR_NOT_SUPPORTED         0xffff000a
  42 #define TEE_ERROR_COMMUNICATION         0xffff000e
  43 #define TEE_ERROR_SECURITY              0xffff000f
  44 #define TEE_ERROR_OUT_OF_MEMORY         0xffff000c
  45 #define TEE_ERROR_TARGET_DEAD           0xffff3024
  46
  47 #define TEE_ORIGIN_COMMS                0x00000002
  48 #define TEE_ORIGIN_TEE                  0x00000003
  49 #define TEE_ORIGIN_TRUSTED_APP          0x00000004
  50
  51 struct udevice;
  52
  53 /**
  54  * struct tee_optee_ta_uuid - OP-TEE Trusted Application (TA) UUID format
  55  *
  56  * Used to identify an OP-TEE TA and define suitable to initialize structs
  57  * of this format is distributed with the interface of the TA. The
  58  * individual fields of this struct doesn't have any special meaning in
  59  * OP-TEE. See RFC4122 for details on the format.
  60  */
  61 struct tee_optee_ta_uuid {
  62         u32 time_low;
  63         u16 time_mid;
  64         u16 time_hi_and_version;
  65         u8 clock_seq_and_node[8];
  66 };
  67
  68 /**
  69  * struct tee_shm - memory shared with the TEE
  70  * @dev:        The TEE device
  71  * @link:       List node in the list in struct struct tee_uclass_priv
  72  * @addr:       Pointer to the shared memory
  73  * @size:       Size of the the shared memory
  74  * @flags:      TEE_SHM_* above
  75  */
  76 struct tee_shm {
  77         struct udevice *dev;
  78         struct list_head link;
  79         void *addr;
  80         ulong size;
  81         u32 flags;
  82 };
  83
  84 /**
  85  * struct tee_param_memref - memory reference for a Trusted Application
  86  * @shm_offs:   Offset in bytes into the shared memory object @shm
  87  * @size:       Size in bytes of the memory reference
  88  * @shm:        Pointer to a shared memory object for the buffer
  89  *
  90  * Used as a part of struct tee_param, see that for more information.
  91  */
  92 struct tee_param_memref {
  93         ulong shm_offs;
  94         ulong size;
  95         struct tee_shm *shm;
  96 };
  97
  98 /**
  99  * struct tee_param_value - value parameter for a Trusted Application
 100  * @a, @b, @c:  Parameters passed by value
 101  *
 102  * Used as a part of struct tee_param, see that for more information.
 103  */
 104 struct tee_param_value {
 105         u64 a;
 106         u64 b;
 107         u64 c;
 108 };
 109
 110 /**
 111  * struct tee_param - invoke parameter for a Trusted Application
 112  * @attr:       Attributes
 113  * @u.memref:   Memref parameter if (@attr & TEE_PARAM_ATTR_MASK) is one of
 114  *              TEE_PARAM_ATTR_TYPE_MEMREF_* above
 115  * @u.value:    Value parameter if (@attr & TEE_PARAM_ATTR_MASK) is one of
 116  *              TEE_PARAM_ATTR_TYPE_VALUE_* above
 117  *
 118  * Parameters to TA are passed using an array of this struct, for
 119  * flexibility both value parameters and memory refereces can be used.
 120  */
 121 struct tee_param {
 122         u64 attr;
 123         union {
 124                 struct tee_param_memref memref;
 125                 struct tee_param_value value;
 126         } u;
 127 };
 128
 129 /**
 130  * struct tee_open_session_arg - extra arguments for tee_open_session()
 131  * @uuid:       [in] UUID of the Trusted Application
 132  * @clnt_uuid:  [in] Normally zeroes
 133  * @clnt_login: [in] Normally 0
 134  * @session:    [out] Session id
 135  * @ret:        [out] return value
 136  * @ret_origin: [out] origin of the return value
 137  */
 138 struct tee_open_session_arg {
 139         u8 uuid[TEE_UUID_LEN];
 140         u8 clnt_uuid[TEE_UUID_LEN];
 141         u32 clnt_login;
 142         u32 session;
 143         u32 ret;
 144         u32 ret_origin;
 145 };
 146
 147 /**
 148  * struct tee_invoke_arg - extra arguments for tee_invoke_func()
 149  * @func:       [in] Trusted Application function, specific to the TA
 150  * @session:    [in] Session id, from open session
 151  * @ret:        [out] return value
 152  * @ret_origin: [out] origin of the return value
 153  */
 154 struct tee_invoke_arg {
 155         u32 func;
 156         u32 session;
 157         u32 ret;
 158         u32 ret_origin;
 159 };
 160
 161 /**
 162  * struct tee_version_data - description of TEE
 163  * @gen_caps:   Generic capabilities, TEE_GEN_CAP_* above
 164  */
 165 struct tee_version_data {
 166         u32 gen_caps;
 167 };
 168
 169 /**
 170  * struct tee_driver_ops - TEE driver operations
 171  * @get_version:        Query capabilities of TEE device,
 172  * @open_session:       Opens a session to a Trusted Application in the TEE,
 173  * @close_session:      Closes a session to Trusted Application,
 174  * @invoke_func:        Invokes a function in a Trusted Application,
 175  * @shm_register:       Registers memory shared with the TEE
 176  * @shm_unregister:     Unregisters memory shared with the TEE
 177  */
 178 struct tee_driver_ops {
 179         /**
 180          * get_version() - Query capabilities of TEE device
 181          * @dev:        The TEE device
 182          * @vers:       Pointer to version data
 183          */
 184         void (*get_version)(struct udevice *dev, struct tee_version_data *vers);
 185         /**
 186          * open_session() - Open a session to a Trusted Application
 187          * @dev:        The TEE device
 188          * @arg:        Open session arguments
 189          * @num_param:  Number of elements in @param
 190          * @param:      Parameters for Trusted Application
 191          *
 192          * Returns < 0 on error else see @arg->ret for result. If @arg->ret is
 193          * TEE_SUCCESS the session identifier is available in @arg->session.
 194          */
 195         int (*open_session)(struct udevice *dev,
 196                             struct tee_open_session_arg *arg, uint num_param,
 197                             struct tee_param *param);
 198         /**
 199          * close_session() - Close a session to a Trusted Application
 200          * @dev:        The TEE device
 201          * @session:    Session id
 202          *
 203          * Return < 0 on error else 0, regardless the session will not be valid
 204          * after this function has returned.
 205          */
 206         int (*close_session)(struct udevice *dev, u32 session);
 207         /**
 208          * tee_invoke_func() - Invoke a function in a Trusted Application
 209          * @dev:        The TEE device
 210          * @arg:        Invoke arguments
 211          * @num_param:  Number of elements in @param
 212          * @param:      Parameters for Trusted Application
 213          *
 214          * Returns < 0 on error else see @arg->ret for result.
 215          */
 216         int (*invoke_func)(struct udevice *dev, struct tee_invoke_arg *arg,
 217                            uint num_param, struct tee_param *param);
 218         /**
 219          * shm_register() - Registers memory shared with the TEE
 220          * @dev:        The TEE device
 221          * @shm:        Pointer to a shared memory object
 222          * Returns 0 on success or < 0 on failure.
 223          */
 224         int (*shm_register)(struct udevice *dev, struct tee_shm *shm);
 225         /**
 226          * shm_unregister() - Unregisters memory shared with the TEE
 227          * @dev:        The TEE device
 228          * @shm:        Pointer to a shared memory object
 229          * Returns 0 on success or < 0 on failure.
 230          */
 231         int (*shm_unregister)(struct udevice *dev, struct tee_shm *shm);
 232 };
 233
 234 /**
 235  * __tee_shm_add() - Internal helper function to register shared memory
 236  * @dev:        The TEE device
 237  * @align:      Required alignment of allocated memory block if
 238  *              (@flags & TEE_SHM_ALLOC)
 239  * @addr:       Address of memory block, ignored if (@flags & TEE_SHM_ALLOC)
 240  * @size:       Size of memory block
 241  * @flags:      TEE_SHM_* above
 242  * @shmp:       If the function return 0, this holds the allocated
 243  *              struct tee_shm
 244  *
 245  * returns 0 on success or < 0 on failure.
 246  */
 247 int __tee_shm_add(struct udevice *dev, ulong align, void *addr, ulong size,
 248                   u32 flags, struct tee_shm **shmp);
 249
 250 /**
 251  * tee_shm_alloc() - Allocate shared memory
 252  * @dev:        The TEE device
 253  * @size:       Size of memory block
 254  * @flags:      TEE_SHM_* above
 255  * @shmp:       If the function return 0, this holds the allocated
 256  *              struct tee_shm
 257  *
 258  * returns 0 on success or < 0 on failure.
 259  */
 260 int tee_shm_alloc(struct udevice *dev, ulong size, u32 flags,
 261                   struct tee_shm **shmp);
 262
 263 /**
 264  * tee_shm_register() - Registers shared memory
 265  * @dev:        The TEE device
 266  * @addr:       Address of memory block
 267  * @size:       Size of memory block
 268  * @flags:      TEE_SHM_* above
 269  * @shmp:       If the function return 0, this holds the allocated
 270  *              struct tee_shm
 271  *
 272  * returns 0 on success or < 0 on failure.
 273  */
 274 int tee_shm_register(struct udevice *dev, void *addr, ulong size, u32 flags,
 275                      struct tee_shm **shmp);
 276
 277 /**
 278  * tee_shm_free() - Frees shared memory
 279  * @shm:        Shared memory object
 280  */
 281 void tee_shm_free(struct tee_shm *shm);
 282
 283 /**
 284  * tee_shm_is_registered() - Check register status of shared memory object
 285  * @shm:        Pointer to shared memory object
 286  * @dev:        The TEE device
 287  *
 288  * Returns true if the shared memory object is registered for the supplied
 289  * TEE device
 290  */
 291 bool tee_shm_is_registered(struct tee_shm *shm, struct udevice *dev);
 292
 293 /**
 294  * tee_find_device() - Look up a TEE device
 295  * @start:      if not NULL, continue search after this device
 296  * @match:      function to check TEE device, returns != 0 if the device
 297  *              matches
 298  * @data:       data for match function
 299  * @vers:       if not NULL, version data of TEE device of the device returned
 300  *
 301  * Returns a probed TEE device of the first TEE device matched by the
 302  * match() callback or NULL.
 303  */
 304 struct udevice *tee_find_device(struct udevice *start,
 305                                 int (*match)(struct tee_version_data *vers,
 306                                              const void *data),
 307                                 const void *data,
 308                                 struct tee_version_data *vers);
 309
 310 /**
 311  * tee_get_version() - Query capabilities of TEE device
 312  * @dev:        The TEE device
 313  * @vers:       Pointer to version data
 314  */
 315 void tee_get_version(struct udevice *dev, struct tee_version_data *vers);
 316
 317 /**
 318  * tee_open_session() - Open a session to a Trusted Application
 319  * @dev:        The TEE device
 320  * @arg:        Open session arguments
 321  * @num_param:  Number of elements in @param
 322  * @param:      Parameters for Trusted Application
 323  *
 324  * Returns < 0 on error else see @arg->ret for result. If @arg->ret is
 325  * TEE_SUCCESS the session identifier is available in @arg->session.
 326  */
 327 int tee_open_session(struct udevice *dev, struct tee_open_session_arg *arg,
 328                      uint num_param, struct tee_param *param);
 329
 330 /**
 331  * tee_close_session() - Close a session to a Trusted Application
 332  * @dev:        The TEE device
 333  * @session:    Session id
 334  *
 335  * Return < 0 on error else 0, regardless the session will not be valid
 336  * after this function has returned.
 337  */
 338 int tee_close_session(struct udevice *dev, u32 session);
 339
 340 /**
 341  * tee_invoke_func() - Invoke a function in a Trusted Application
 342  * @dev:        The TEE device
 343  * @arg:        Invoke arguments
 344  * @num_param:  Number of elements in @param
 345  * @param:      Parameters for Trusted Application
 346  *
 347  * Returns < 0 on error else see @arg->ret for result.
 348  */
 349 int tee_invoke_func(struct udevice *dev, struct tee_invoke_arg *arg,
 350                     uint num_param, struct tee_param *param);
 351
 352 /**
 353  * tee_optee_ta_uuid_from_octets() - Converts to struct tee_optee_ta_uuid
 354  * @d:  Destination struct
 355  * @s:  Source UUID octets
 356  *
 357  * Conversion to a struct tee_optee_ta_uuid represantion from binary octet
 358  * representation.
 359  */
 360 void tee_optee_ta_uuid_from_octets(struct tee_optee_ta_uuid *d,
 361                                    const u8 s[TEE_UUID_LEN]);
 362
 363 /**
 364  * tee_optee_ta_uuid_to_octets() - Converts from struct tee_optee_ta_uuid
 365  * @d:  Destination UUID octets
 366  * @s:  Source struct
 367  *
 368  * Conversion from a struct tee_optee_ta_uuid represantion to binary octet
 369  * representation.
 370  */
 371 void tee_optee_ta_uuid_to_octets(u8 d[TEE_UUID_LEN],
 372                                  const struct tee_optee_ta_uuid *s);
 373
 374 #endif /* __TEE_H */