/* * This file defines the OP-TEE message protocol (ABI) used to communicate * with an instance of OP-TEE running in secure world. * * This file is divided into two sections. * 1. Formatting of messages. * 2. Requests from normal world
*/
/***************************************************************************** * Part 1 - formatting of messages
*****************************************************************************/
/* * Meta parameter to be absorbed by the Secure OS and not passed * to the Trusted Application. * * Currently only used with OPTEE_MSG_CMD_OPEN_SESSION.
*/ #define OPTEE_MSG_ATTR_META BIT(8)
/* * Pointer to a list of pages used to register user-defined SHM buffer. * Used with OPTEE_MSG_ATTR_TYPE_TMEM_*. * buf_ptr should point to the beginning of the buffer. Buffer will contain * list of page addresses. OP-TEE core can reconstruct contiguous buffer from * that page addresses list. Page addresses are stored as 64 bit values. * Last entry on a page should point to the next page of buffer. * Every entry in buffer should point to a 4k page beginning (12 least * significant bits must be equal to zero). * * 12 least significant bits of optee_msg_param.u.tmem.buf_ptr should hold * page offset of user buffer. * * So, entries should be placed like members of this structure: * * struct page_data { * uint64_t pages_array[OPTEE_MSG_NONCONTIG_PAGE_SIZE/sizeof(uint64_t) - 1]; * uint64_t next_page_data; * }; * * Structure is designed to exactly fit into the page size * OPTEE_MSG_NONCONTIG_PAGE_SIZE which is a standard 4KB page. * * The size of 4KB is chosen because this is the smallest page size for ARM * architectures. If REE uses larger pages, it should divide them to 4KB ones.
*/ #define OPTEE_MSG_ATTR_NONCONTIG BIT(9)
/* * Memory attributes for caching passed with temp memrefs. The actual value * used is defined outside the message protocol with the exception of * OPTEE_MSG_ATTR_CACHE_PREDEFINED which means the attributes already * defined for the memory range should be used. If optee_smc.h is used as * bearer of this protocol OPTEE_SMC_SHM_* is used for values.
*/ #define OPTEE_MSG_ATTR_CACHE_SHIFT 16 #define OPTEE_MSG_ATTR_CACHE_MASK GENMASK(2, 0) #define OPTEE_MSG_ATTR_CACHE_PREDEFINED 0
/* * Same values as TEE_LOGIN_* from TEE Internal API
*/ #define OPTEE_MSG_LOGIN_PUBLIC 0x00000000 #define OPTEE_MSG_LOGIN_USER 0x00000001 #define OPTEE_MSG_LOGIN_GROUP 0x00000002 #define OPTEE_MSG_LOGIN_APPLICATION 0x00000004 #define OPTEE_MSG_LOGIN_APPLICATION_USER 0x00000005 #define OPTEE_MSG_LOGIN_APPLICATION_GROUP 0x00000006
/* * Page size used in non-contiguous buffer entries
*/ #define OPTEE_MSG_NONCONTIG_PAGE_SIZE 4096
/** * struct optee_msg_param_tmem - temporary memory reference parameter * @buf_ptr: Address of the buffer * @size: Size of the buffer * @shm_ref: Temporary shared memory reference, pointer to a struct tee_shm * * Secure and normal world communicates pointers as physical address * instead of the virtual address. This is because secure and normal world * have completely independent memory mapping. Normal world can even have a * hypervisor which need to translate the guest physical address (AKA IPA * in ARM documentation) to a real physical address before passing the * structure to secure world.
*/ struct optee_msg_param_tmem {
u64 buf_ptr;
u64 size;
u64 shm_ref;
};
/** * struct optee_msg_param_rmem - registered memory reference parameter * @offs: Offset into shared memory reference * @size: Size of the buffer * @shm_ref: Shared memory reference, pointer to a struct tee_shm
*/ struct optee_msg_param_rmem {
u64 offs;
u64 size;
u64 shm_ref;
};
/** * struct optee_msg_param_fmem - ffa memory reference parameter * @offs_lower: Lower bits of offset into shared memory reference * @offs_upper: Upper bits of offset into shared memory reference * @internal_offs: Internal offset into the first page of shared memory * reference * @size: Size of the buffer * @global_id: Global identifier of Shared memory
*/ struct optee_msg_param_fmem {
u32 offs_low;
u16 offs_high;
u16 internal_offs;
u64 size;
u64 global_id;
};
/** * struct optee_msg_param_value - opaque value parameter * * Value parameters are passed unchecked between normal and secure world.
*/ struct optee_msg_param_value {
u64 a;
u64 b;
u64 c;
};
/** * struct optee_msg_param - parameter used together with struct optee_msg_arg * @attr: attributes * @tmem: parameter by temporary memory reference * @rmem: parameter by registered memory reference * @fmem: parameter by ffa registered memory reference * @value: parameter by opaque value * @octets: parameter by octet string * * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets, * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and * OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_* indicates * @rmem or @fmem depending on the conduit. * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
*/ struct optee_msg_param {
u64 attr; union { struct optee_msg_param_tmem tmem; struct optee_msg_param_rmem rmem; struct optee_msg_param_fmem fmem; struct optee_msg_param_value value;
u8 octets[24];
} u;
};
/** * struct optee_msg_arg - call argument * @cmd: Command, one of OPTEE_MSG_CMD_* or OPTEE_MSG_RPC_CMD_* * @func: Trusted Application function, specific to the Trusted Application, * used if cmd == OPTEE_MSG_CMD_INVOKE_COMMAND * @session: In parameter for all OPTEE_MSG_CMD_* except * OPTEE_MSG_CMD_OPEN_SESSION where it's an output parameter instead * @cancel_id: Cancellation id, a unique value to identify this request * @ret: return value * @ret_origin: origin of the return value * @num_params: number of parameters supplied to the OS Command * @params: the parameters supplied to the OS Command * * All normal calls to Trusted OS uses this struct. If cmd requires further * information than what these fields hold it can be passed as a parameter * tagged as meta (setting the OPTEE_MSG_ATTR_META bit in corresponding * attrs field). All parameters tagged as meta have to come first.
*/ struct optee_msg_arg {
u32 cmd;
u32 func;
u32 session;
u32 cancel_id;
u32 pad;
u32 ret;
u32 ret_origin;
u32 num_params;
/* num_params tells the actual number of element in params */ struct optee_msg_param params[];
};
/** * OPTEE_MSG_GET_ARG_SIZE - return size of struct optee_msg_arg * * @num_params: Number of parameters embedded in the struct optee_msg_arg * * Returns the size of the struct optee_msg_arg together with the number * of embedded parameters.
*/ #define OPTEE_MSG_GET_ARG_SIZE(num_params) \
(sizeof(struct optee_msg_arg) + \ sizeof(struct optee_msg_param) * (num_params))
/***************************************************************************** * Part 2 - requests from normal world
*****************************************************************************/
/* * Return the following UID if using API specified in this file without * further extensions: * 384fb3e0-e7f8-11e3-af63-0002a5d5c51b. * Represented in 4 32-bit words in OPTEE_MSG_UID_0, OPTEE_MSG_UID_1, * OPTEE_MSG_UID_2, OPTEE_MSG_UID_3. * * In the case where the OP-TEE image is loaded by the kernel, this will * initially return an alternate UID to reflect that we are communicating with * the TF-A image loading service at that time instead of OP-TEE. That UID is: * a3fbeab1-1246-315d-c7c4-06b9c03cbea4. * Represented in 4 32-bit words in OPTEE_MSG_IMAGE_LOAD_UID_0, * OPTEE_MSG_IMAGE_LOAD_UID_1, OPTEE_MSG_IMAGE_LOAD_UID_2, * OPTEE_MSG_IMAGE_LOAD_UID_3.
*/ #define OPTEE_MSG_UID_0 0x384fb3e0 #define OPTEE_MSG_UID_1 0xe7f811e3 #define OPTEE_MSG_UID_2 0xaf630002 #define OPTEE_MSG_UID_3 0xa5d5c51b #define OPTEE_MSG_IMAGE_LOAD_UID_0 0xa3fbeab1 #define OPTEE_MSG_IMAGE_LOAD_UID_1 0x1246315d #define OPTEE_MSG_IMAGE_LOAD_UID_2 0xc7c406b9 #define OPTEE_MSG_IMAGE_LOAD_UID_3 0xc03cbea4 #define OPTEE_MSG_FUNCID_CALLS_UID 0xFF01
/* * Returns 2.0 if using API specified in this file without further * extensions. Represented in 2 32-bit words in OPTEE_MSG_REVISION_MAJOR * and OPTEE_MSG_REVISION_MINOR
*/ #define OPTEE_MSG_REVISION_MAJOR 2 #define OPTEE_MSG_REVISION_MINOR 0 #define OPTEE_MSG_FUNCID_CALLS_REVISION 0xFF03
/* * 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 4 32-bit words in the same way as * OPTEE_MSG_FUNCID_CALLS_UID described above.
*/ #define OPTEE_MSG_OS_OPTEE_UUID_0 0x486178e0 #define OPTEE_MSG_OS_OPTEE_UUID_1 0xe7f811e3 #define OPTEE_MSG_OS_OPTEE_UUID_2 0xbc5e0002 #define OPTEE_MSG_OS_OPTEE_UUID_3 0xa5d5c51b #define OPTEE_MSG_FUNCID_GET_OS_UUID 0x0000
/* * 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 2 32-bit words in the same way as * OPTEE_MSG_CALLS_REVISION described above.
*/ #define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001
/* * Do a secure call with struct optee_msg_arg as argument * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd * * OPTEE_MSG_CMD_OPEN_SESSION opens a session to a Trusted Application. * The first two parameters are tagged as meta, holding two value * parameters to pass the following information: * param[0].u.value.a-b uuid of Trusted Application * param[1].u.value.a-b uuid of Client * param[1].u.value.c Login class of client OPTEE_MSG_LOGIN_* * * OPTEE_MSG_CMD_INVOKE_COMMAND invokes a command a previously opened * session to a Trusted Application. struct optee_msg_arg::func is Trusted * Application function, specific to the Trusted Application. * * OPTEE_MSG_CMD_CLOSE_SESSION closes a previously opened session to * Trusted Application. * * OPTEE_MSG_CMD_CANCEL cancels a currently invoked command. * * OPTEE_MSG_CMD_REGISTER_SHM registers a shared memory reference. The * information is passed as: * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_TMEM_INPUT * [| OPTEE_MSG_ATTR_NONCONTIG] * [in] param[0].u.tmem.buf_ptr physical address (of first fragment) * [in] param[0].u.tmem.size size (of first fragment) * [in] param[0].u.tmem.shm_ref holds shared memory reference * * OPTEE_MSG_CMD_UNREGISTER_SHM unregisters a previously registered shared * memory reference. The information is passed as: * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_RMEM_INPUT * [in] param[0].u.rmem.shm_ref holds shared memory reference * [in] param[0].u.rmem.offs 0 * [in] param[0].u.rmem.size 0 * * OPTEE_MSG_CMD_DO_BOTTOM_HALF does the scheduled bottom half processing * of a driver. * * OPTEE_MSG_CMD_STOP_ASYNC_NOTIF informs secure world that from now is * normal world unable to process asynchronous notifications. Typically * used when the driver is shut down.
*/ #define OPTEE_MSG_CMD_OPEN_SESSION 0 #define OPTEE_MSG_CMD_INVOKE_COMMAND 1 #define OPTEE_MSG_CMD_CLOSE_SESSION 2 #define OPTEE_MSG_CMD_CANCEL 3 #define OPTEE_MSG_CMD_REGISTER_SHM 4 #define OPTEE_MSG_CMD_UNREGISTER_SHM 5 #define OPTEE_MSG_CMD_DO_BOTTOM_HALF 6 #define OPTEE_MSG_CMD_STOP_ASYNC_NOTIF 7 #define OPTEE_MSG_FUNCID_CALL_WITH_ARG 0x0004
#endif/* _OPTEE_MSG_H */
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