1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * Copyright (c) 2019-2021, 2023 Linaro Limited 4 */ 5 6 /* 7 * This file is exported by OP-TEE and is kept in sync between secure world 8 * and normal world drivers. We're using ARM FF-A 1.0 specification. 9 */ 10 11 #ifndef __OPTEE_FFA_H 12 #define __OPTEE_FFA_H 13 14 #include <linux/arm_ffa.h> 15 16 /* 17 * Normal world sends requests with FFA_MSG_SEND_DIRECT_REQ and 18 * responses are returned with FFA_MSG_SEND_DIRECT_RESP for normal 19 * messages. 20 * 21 * All requests with FFA_MSG_SEND_DIRECT_REQ and FFA_MSG_SEND_DIRECT_RESP 22 * are using the AArch32 SMC calling convention with register usage as 23 * defined in FF-A specification: 24 * w0: Function ID (0x8400006F or 0x84000070) 25 * w1: Source/Destination IDs 26 * w2: Reserved (MBZ) 27 * w3-w7: Implementation defined, free to be used below 28 */ 29 30 #define OPTEE_FFA_VERSION_MAJOR 1 31 #define OPTEE_FFA_VERSION_MINOR 0 32 33 #define OPTEE_FFA_BLOCKING_CALL(id) (id) 34 #define OPTEE_FFA_YIELDING_CALL_BIT 31 35 #define OPTEE_FFA_YIELDING_CALL(id) ((id) | BIT(OPTEE_FFA_YIELDING_CALL_BIT)) 36 37 /* 38 * Returns the API version implemented, currently follows the FF-A version. 39 * Call register usage: 40 * w3: Service ID, OPTEE_FFA_GET_API_VERSION 41 * w4-w7: Not used (MBZ) 42 * 43 * Return register usage: 44 * w3: OPTEE_FFA_VERSION_MAJOR 45 * w4: OPTEE_FFA_VERSION_MINOR 46 * w5-w7: Not used (MBZ) 47 */ 48 #define OPTEE_FFA_GET_API_VERSION OPTEE_FFA_BLOCKING_CALL(0) 49 50 /* 51 * Returns the revision of OP-TEE. 52 * 53 * Used by non-secure world to figure out which version of the Trusted OS 54 * is installed. Note that the returned revision is the revision of the 55 * Trusted OS, not of the API. 56 * 57 * Call register usage: 58 * w3: Service ID, OPTEE_FFA_GET_OS_VERSION 59 * w4-w7: Unused (MBZ) 60 * 61 * Return register usage: 62 * w3: CFG_OPTEE_REVISION_MAJOR 63 * w4: CFG_OPTEE_REVISION_MINOR 64 * w5: TEE_IMPL_GIT_SHA1 (or zero if not supported) 65 */ 66 #define OPTEE_FFA_GET_OS_VERSION OPTEE_FFA_BLOCKING_CALL(1) 67 68 /* 69 * Exchange capabilities between normal world and secure world. 70 * 71 * Currently there are no defined capabilities. When features are added new 72 * capabilities may be added. 73 * 74 * Call register usage: 75 * w3: Service ID, OPTEE_FFA_EXCHANGE_CAPABILITIES 76 * w4-w7: Not used (MBZ) 77 * 78 * Return register usage: 79 * w3: Error code, 0 on success 80 * w4: Bit[7:0]: Number of parameters needed for RPC to be supplied 81 * as the second MSG arg struct for 82 * OPTEE_FFA_YIELDING_CALL_WITH_ARG. 83 * Bit[31:8]: Reserved (MBZ) 84 * w5: Bitfield of secure world capabilities OPTEE_FFA_SEC_CAP_* below, 85 * w6: The maximum secure world notification number 86 * w7: Not used (MBZ) 87 */ 88 /* 89 * Secure world supports giving an offset into the argument shared memory 90 * object, see also OPTEE_FFA_YIELDING_CALL_WITH_ARG 91 */ 92 #define OPTEE_FFA_SEC_CAP_ARG_OFFSET BIT(0) 93 /* OP-TEE supports asynchronous notification via FF-A */ 94 #define OPTEE_FFA_SEC_CAP_ASYNC_NOTIF BIT(1) 95 /* OP-TEE supports probing for RPMB device if needed */ 96 #define OPTEE_FFA_SEC_CAP_RPMB_PROBE BIT(2) 97 98 #define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2) 99 100 /* 101 * Unregister shared memory 102 * 103 * Call register usage: 104 * w3: Service ID, OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM 105 * w4: Shared memory handle, lower bits 106 * w5: Shared memory handle, higher bits 107 * w6-w7: Not used (MBZ) 108 * 109 * Return register usage: 110 * w3: Error code, 0 on success 111 * w4-w7: Note used (MBZ) 112 */ 113 #define OPTEE_FFA_UNREGISTER_SHM OPTEE_FFA_BLOCKING_CALL(3) 114 115 /* 116 * Inform OP-TEE that the normal world is able to receive asynchronous 117 * notifications. 118 * 119 * Call register usage: 120 * w3: Service ID, OPTEE_FFA_ENABLE_ASYNC_NOTIF 121 * w4: Notification value to request bottom half processing, should be 122 * less than OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE. 123 * w5-w7: Not used (MBZ) 124 * 125 * Return register usage: 126 * w3: Error code, 0 on success 127 * w4-w7: Note used (MBZ) 128 */ 129 #define OPTEE_FFA_ENABLE_ASYNC_NOTIF OPTEE_FFA_BLOCKING_CALL(5) 130 131 #define OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE 64 132 133 /* 134 * Call with struct optee_msg_arg as argument in the supplied shared memory 135 * with a zero internal offset and normal cached memory attributes. 136 * Register usage: 137 * w3: Service ID, OPTEE_FFA_YIELDING_CALL_WITH_ARG 138 * w4: Lower 32 bits of a 64-bit Shared memory handle 139 * w5: Upper 32 bits of a 64-bit Shared memory handle 140 * w6: Offset into shared memory pointing to a struct optee_msg_arg 141 * right after the parameters of this struct (at offset 142 * OPTEE_MSG_GET_ARG_SIZE(num_params) follows a struct optee_msg_arg 143 * for RPC, this struct has reserved space for the number of RPC 144 * parameters as returned by OPTEE_FFA_EXCHANGE_CAPABILITIES. 145 * MBZ unless the bit OPTEE_FFA_SEC_CAP_ARG_OFFSET is received with 146 * OPTEE_FFA_EXCHANGE_CAPABILITIES. 147 * w7: Not used (MBZ) 148 * Resume from RPC. Register usage: 149 * w3: Service ID, OPTEE_FFA_YIELDING_CALL_RESUME 150 * w4-w6: Not used (MBZ) 151 * w7: Resume info 152 * 153 * Normal return (yielding call is completed). Register usage: 154 * w3: Error code, 0 on success 155 * w4: OPTEE_FFA_YIELDING_CALL_RETURN_DONE 156 * w5-w7: Not used (MBZ) 157 * 158 * RPC interrupt return (RPC from secure world). Register usage: 159 * w3: Error code == 0 160 * w4: Any defined RPC code but OPTEE_FFA_YIELDING_CALL_RETURN_DONE 161 * w5-w6: Not used (MBZ) 162 * w7: Resume info 163 * 164 * Possible error codes in register w3: 165 * 0: Success 166 * FFA_DENIED: w4 isn't one of OPTEE_FFA_YIELDING_CALL_START 167 * OPTEE_FFA_YIELDING_CALL_RESUME 168 * 169 * Possible error codes for OPTEE_FFA_YIELDING_CALL_START, 170 * FFA_BUSY: Number of OP-TEE OS threads exceeded, 171 * try again later 172 * FFA_DENIED: RPC shared memory object not found 173 * FFA_INVALID_PARAMETER: Bad shared memory handle or offset into the memory 174 * 175 * Possible error codes for OPTEE_FFA_YIELDING_CALL_RESUME 176 * FFA_INVALID_PARAMETER: Bad resume info 177 */ 178 #define OPTEE_FFA_YIELDING_CALL_WITH_ARG OPTEE_FFA_YIELDING_CALL(0) 179 #define OPTEE_FFA_YIELDING_CALL_RESUME OPTEE_FFA_YIELDING_CALL(1) 180 181 #define OPTEE_FFA_YIELDING_CALL_RETURN_DONE 0 182 #define OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD 1 183 #define OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT 2 184 185 #endif /*__OPTEE_FFA_H*/ 186