1/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */ 2/* 3 * Copyright (c) 2015-2021, Linaro Limited 4 */ 5#ifndef _OPTEE_MSG_H 6#define _OPTEE_MSG_H 7 8#include <linux/bitops.h> 9#include <linux/types.h> 10 11/* 12 * This file defines the OP-TEE message protocol (ABI) used to communicate 13 * with an instance of OP-TEE running in secure world. 14 * 15 * This file is divided into two sections. 16 * 1. Formatting of messages. 17 * 2. Requests from normal world 18 */ 19 20/***************************************************************************** 21 * Part 1 - formatting of messages 22 *****************************************************************************/ 23 24#define OPTEE_MSG_ATTR_TYPE_NONE 0x0 25#define OPTEE_MSG_ATTR_TYPE_VALUE_INPUT 0x1 26#define OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT 0x2 27#define OPTEE_MSG_ATTR_TYPE_VALUE_INOUT 0x3 28#define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT 0x5 29#define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT 0x6 30#define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT 0x7 31#define OPTEE_MSG_ATTR_TYPE_FMEM_INPUT OPTEE_MSG_ATTR_TYPE_RMEM_INPUT 32#define OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT 33#define OPTEE_MSG_ATTR_TYPE_FMEM_INOUT OPTEE_MSG_ATTR_TYPE_RMEM_INOUT 34#define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT 0x9 35#define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT 0xa 36#define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT 0xb 37 38#define OPTEE_MSG_ATTR_TYPE_MASK GENMASK(7, 0) 39 40/* 41 * Meta parameter to be absorbed by the Secure OS and not passed 42 * to the Trusted Application. 43 * 44 * Currently only used with OPTEE_MSG_CMD_OPEN_SESSION. 45 */ 46#define OPTEE_MSG_ATTR_META BIT(8) 47 48/* 49 * Pointer to a list of pages used to register user-defined SHM buffer. 50 * Used with OPTEE_MSG_ATTR_TYPE_TMEM_*. 51 * buf_ptr should point to the beginning of the buffer. Buffer will contain 52 * list of page addresses. OP-TEE core can reconstruct contiguous buffer from 53 * that page addresses list. Page addresses are stored as 64 bit values. 54 * Last entry on a page should point to the next page of buffer. 55 * Every entry in buffer should point to a 4k page beginning (12 least 56 * significant bits must be equal to zero). 57 * 58 * 12 least significant bits of optee_msg_param.u.tmem.buf_ptr should hold 59 * page offset of user buffer. 60 * 61 * So, entries should be placed like members of this structure: 62 * 63 * struct page_data { 64 * uint64_t pages_array[OPTEE_MSG_NONCONTIG_PAGE_SIZE/sizeof(uint64_t) - 1]; 65 * uint64_t next_page_data; 66 * }; 67 * 68 * Structure is designed to exactly fit into the page size 69 * OPTEE_MSG_NONCONTIG_PAGE_SIZE which is a standard 4KB page. 70 * 71 * The size of 4KB is chosen because this is the smallest page size for ARM 72 * architectures. If REE uses larger pages, it should divide them to 4KB ones. 73 */ 74#define OPTEE_MSG_ATTR_NONCONTIG BIT(9) 75 76/* 77 * Memory attributes for caching passed with temp memrefs. The actual value 78 * used is defined outside the message protocol with the exception of 79 * OPTEE_MSG_ATTR_CACHE_PREDEFINED which means the attributes already 80 * defined for the memory range should be used. If optee_smc.h is used as 81 * bearer of this protocol OPTEE_SMC_SHM_* is used for values. 82 */ 83#define OPTEE_MSG_ATTR_CACHE_SHIFT 16 84#define OPTEE_MSG_ATTR_CACHE_MASK GENMASK(2, 0) 85#define OPTEE_MSG_ATTR_CACHE_PREDEFINED 0 86 87/* 88 * Same values as TEE_LOGIN_* from TEE Internal API 89 */ 90#define OPTEE_MSG_LOGIN_PUBLIC 0x00000000 91#define OPTEE_MSG_LOGIN_USER 0x00000001 92#define OPTEE_MSG_LOGIN_GROUP 0x00000002 93#define OPTEE_MSG_LOGIN_APPLICATION 0x00000004 94#define OPTEE_MSG_LOGIN_APPLICATION_USER 0x00000005 95#define OPTEE_MSG_LOGIN_APPLICATION_GROUP 0x00000006 96 97/* 98 * Page size used in non-contiguous buffer entries 99 */ 100#define OPTEE_MSG_NONCONTIG_PAGE_SIZE 4096 101 102#define OPTEE_MSG_FMEM_INVALID_GLOBAL_ID 0xffffffffffffffff 103 104/** 105 * struct optee_msg_param_tmem - temporary memory reference parameter 106 * @buf_ptr: Address of the buffer 107 * @size: Size of the buffer 108 * @shm_ref: Temporary shared memory reference, pointer to a struct tee_shm 109 * 110 * Secure and normal world communicates pointers as physical address 111 * instead of the virtual address. This is because secure and normal world 112 * have completely independent memory mapping. Normal world can even have a 113 * hypervisor which need to translate the guest physical address (AKA IPA 114 * in ARM documentation) to a real physical address before passing the 115 * structure to secure world. 116 */ 117struct optee_msg_param_tmem { 118 u64 buf_ptr; 119 u64 size; 120 u64 shm_ref; 121}; 122 123/** 124 * struct optee_msg_param_rmem - registered memory reference parameter 125 * @offs: Offset into shared memory reference 126 * @size: Size of the buffer 127 * @shm_ref: Shared memory reference, pointer to a struct tee_shm 128 */ 129struct optee_msg_param_rmem { 130 u64 offs; 131 u64 size; 132 u64 shm_ref; 133}; 134 135/** 136 * struct optee_msg_param_fmem - ffa memory reference parameter 137 * @offs_lower: Lower bits of offset into shared memory reference 138 * @offs_upper: Upper bits of offset into shared memory reference 139 * @internal_offs: Internal offset into the first page of shared memory 140 * reference 141 * @size: Size of the buffer 142 * @global_id: Global identifier of Shared memory 143 */ 144struct optee_msg_param_fmem { 145 u32 offs_low; 146 u16 offs_high; 147 u16 internal_offs; 148 u64 size; 149 u64 global_id; 150}; 151 152/** 153 * struct optee_msg_param_value - opaque value parameter 154 * 155 * Value parameters are passed unchecked between normal and secure world. 156 */ 157struct optee_msg_param_value { 158 u64 a; 159 u64 b; 160 u64 c; 161}; 162 163/** 164 * struct optee_msg_param - parameter used together with struct optee_msg_arg 165 * @attr: attributes 166 * @tmem: parameter by temporary memory reference 167 * @rmem: parameter by registered memory reference 168 * @fmem: parameter by ffa registered memory reference 169 * @value: parameter by opaque value 170 * @octets: parameter by octet string 171 * 172 * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in 173 * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets, 174 * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and 175 * OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_* indicates 176 * @rmem or @fmem depending on the conduit. 177 * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used. 178 */ 179struct optee_msg_param { 180 u64 attr; 181 union { 182 struct optee_msg_param_tmem tmem; 183 struct optee_msg_param_rmem rmem; 184 struct optee_msg_param_fmem fmem; 185 struct optee_msg_param_value value; 186 u8 octets[24]; 187 } u; 188}; 189 190/** 191 * struct optee_msg_arg - call argument 192 * @cmd: Command, one of OPTEE_MSG_CMD_* or OPTEE_MSG_RPC_CMD_* 193 * @func: Trusted Application function, specific to the Trusted Application, 194 * used if cmd == OPTEE_MSG_CMD_INVOKE_COMMAND 195 * @session: In parameter for all OPTEE_MSG_CMD_* except 196 * OPTEE_MSG_CMD_OPEN_SESSION where it's an output parameter instead 197 * @cancel_id: Cancellation id, a unique value to identify this request 198 * @ret: return value 199 * @ret_origin: origin of the return value 200 * @num_params: number of parameters supplied to the OS Command 201 * @params: the parameters supplied to the OS Command 202 * 203 * All normal calls to Trusted OS uses this struct. If cmd requires further 204 * information than what these fields hold it can be passed as a parameter 205 * tagged as meta (setting the OPTEE_MSG_ATTR_META bit in corresponding 206 * attrs field). All parameters tagged as meta have to come first. 207 */ 208struct optee_msg_arg { 209 u32 cmd; 210 u32 func; 211 u32 session; 212 u32 cancel_id; 213 u32 pad; 214 u32 ret; 215 u32 ret_origin; 216 u32 num_params; 217 218 /* num_params tells the actual number of element in params */ 219 struct optee_msg_param params[]; 220}; 221 222/** 223 * OPTEE_MSG_GET_ARG_SIZE - return size of struct optee_msg_arg 224 * 225 * @num_params: Number of parameters embedded in the struct optee_msg_arg 226 * 227 * Returns the size of the struct optee_msg_arg together with the number 228 * of embedded parameters. 229 */ 230#define OPTEE_MSG_GET_ARG_SIZE(num_params) \ 231 (sizeof(struct optee_msg_arg) + \ 232 sizeof(struct optee_msg_param) * (num_params)) 233 234/***************************************************************************** 235 * Part 2 - requests from normal world 236 *****************************************************************************/ 237 238/* 239 * Return the following UID if using API specified in this file without 240 * further extensions: 241 * 384fb3e0-e7f8-11e3-af63-0002a5d5c51b. 242 * Represented in 4 32-bit words in OPTEE_MSG_UID_0, OPTEE_MSG_UID_1, 243 * OPTEE_MSG_UID_2, OPTEE_MSG_UID_3. 244 */ 245#define OPTEE_MSG_UID_0 0x384fb3e0 246#define OPTEE_MSG_UID_1 0xe7f811e3 247#define OPTEE_MSG_UID_2 0xaf630002 248#define OPTEE_MSG_UID_3 0xa5d5c51b 249#define OPTEE_MSG_FUNCID_CALLS_UID 0xFF01 250 251/* 252 * Returns 2.0 if using API specified in this file without further 253 * extensions. Represented in 2 32-bit words in OPTEE_MSG_REVISION_MAJOR 254 * and OPTEE_MSG_REVISION_MINOR 255 */ 256#define OPTEE_MSG_REVISION_MAJOR 2 257#define OPTEE_MSG_REVISION_MINOR 0 258#define OPTEE_MSG_FUNCID_CALLS_REVISION 0xFF03 259 260/* 261 * Get UUID of Trusted OS. 262 * 263 * Used by non-secure world to figure out which Trusted OS is installed. 264 * Note that returned UUID is the UUID of the Trusted OS, not of the API. 265 * 266 * Returns UUID in 4 32-bit words in the same way as 267 * OPTEE_MSG_FUNCID_CALLS_UID described above. 268 */ 269#define OPTEE_MSG_OS_OPTEE_UUID_0 0x486178e0 270#define OPTEE_MSG_OS_OPTEE_UUID_1 0xe7f811e3 271#define OPTEE_MSG_OS_OPTEE_UUID_2 0xbc5e0002 272#define OPTEE_MSG_OS_OPTEE_UUID_3 0xa5d5c51b 273#define OPTEE_MSG_FUNCID_GET_OS_UUID 0x0000 274 275/* 276 * Get revision of Trusted OS. 277 * 278 * Used by non-secure world to figure out which version of the Trusted OS 279 * is installed. Note that the returned revision is the revision of the 280 * Trusted OS, not of the API. 281 * 282 * Returns revision in 2 32-bit words in the same way as 283 * OPTEE_MSG_CALLS_REVISION described above. 284 */ 285#define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001 286 287/* 288 * Do a secure call with struct optee_msg_arg as argument 289 * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd 290 * 291 * OPTEE_MSG_CMD_OPEN_SESSION opens a session to a Trusted Application. 292 * The first two parameters are tagged as meta, holding two value 293 * parameters to pass the following information: 294 * param[0].u.value.a-b uuid of Trusted Application 295 * param[1].u.value.a-b uuid of Client 296 * param[1].u.value.c Login class of client OPTEE_MSG_LOGIN_* 297 * 298 * OPTEE_MSG_CMD_INVOKE_COMMAND invokes a command a previously opened 299 * session to a Trusted Application. struct optee_msg_arg::func is Trusted 300 * Application function, specific to the Trusted Application. 301 * 302 * OPTEE_MSG_CMD_CLOSE_SESSION closes a previously opened session to 303 * Trusted Application. 304 * 305 * OPTEE_MSG_CMD_CANCEL cancels a currently invoked command. 306 * 307 * OPTEE_MSG_CMD_REGISTER_SHM registers a shared memory reference. The 308 * information is passed as: 309 * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_TMEM_INPUT 310 * [| OPTEE_MSG_ATTR_NONCONTIG] 311 * [in] param[0].u.tmem.buf_ptr physical address (of first fragment) 312 * [in] param[0].u.tmem.size size (of first fragment) 313 * [in] param[0].u.tmem.shm_ref holds shared memory reference 314 * 315 * OPTEE_MSG_CMD_UNREGISTER_SHM unregisters a previously registered shared 316 * memory reference. The information is passed as: 317 * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_RMEM_INPUT 318 * [in] param[0].u.rmem.shm_ref holds shared memory reference 319 * [in] param[0].u.rmem.offs 0 320 * [in] param[0].u.rmem.size 0 321 * 322 * OPTEE_MSG_CMD_DO_BOTTOM_HALF does the scheduled bottom half processing 323 * of a driver. 324 * 325 * OPTEE_MSG_CMD_STOP_ASYNC_NOTIF informs secure world that from now is 326 * normal world unable to process asynchronous notifications. Typically 327 * used when the driver is shut down. 328 */ 329#define OPTEE_MSG_CMD_OPEN_SESSION 0 330#define OPTEE_MSG_CMD_INVOKE_COMMAND 1 331#define OPTEE_MSG_CMD_CLOSE_SESSION 2 332#define OPTEE_MSG_CMD_CANCEL 3 333#define OPTEE_MSG_CMD_REGISTER_SHM 4 334#define OPTEE_MSG_CMD_UNREGISTER_SHM 5 335#define OPTEE_MSG_CMD_DO_BOTTOM_HALF 6 336#define OPTEE_MSG_CMD_STOP_ASYNC_NOTIF 7 337#define OPTEE_MSG_FUNCID_CALL_WITH_ARG 0x0004 338 339#endif /* _OPTEE_MSG_H */ 340