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Diffstat (limited to 'include/linux/tee.h')
| -rw-r--r-- | include/linux/tee.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/include/linux/tee.h b/include/linux/tee.h new file mode 100644 index 00000000000..0cdec2d254a --- /dev/null +++ b/include/linux/tee.h @@ -0,0 +1,143 @@ +/* + * Trusted Execution Environment (TEE) interface for TrustZone enabled ARM CPUs. + * + * Copyright (C) ST-Ericsson SA 2010 + * Author: Shujuan Chen <shujuan.chen@stericsson.com> + * Author: Martin Hovang <martin.xm.hovang@stericsson.com + * Author: Joakim Bech <joakim.xx.bech@stericsson.com> + * License terms: GNU General Public License (GPL) version 2 + */ + +#ifndef TEE_H +#define TEE_H + +/* tee_cmd id values */ +#define TEED_OPEN_SESSION 0x00000000U +#define TEED_CLOSE_SESSION 0x00000001U +#define TEED_INVOKE 0x00000002U + +/* tee_retval id values */ +#define TEED_SUCCESS 0x00000000U +#define TEED_ERROR_GENERIC 0xFFFF0000U +#define TEED_ERROR_ACCESS_DENIED 0xFFFF0001U +#define TEED_ERROR_CANCEL 0xFFFF0002U +#define TEED_ERROR_ACCESS_CONFLICT 0xFFFF0003U +#define TEED_ERROR_EXCESS_DATA 0xFFFF0004U +#define TEED_ERROR_BAD_FORMAT 0xFFFF0005U +#define TEED_ERROR_BAD_PARAMETERS 0xFFFF0006U +#define TEED_ERROR_BAD_STATE 0xFFFF0007U +#define TEED_ERROR_ITEM_NOT_FOUND 0xFFFF0008U +#define TEED_ERROR_NOT_IMPLEMENTED 0xFFFF0009U +#define TEED_ERROR_NOT_SUPPORTED 0xFFFF000AU +#define TEED_ERROR_NO_DATA 0xFFFF000BU +#define TEED_ERROR_OUT_OF_MEMORY 0xFFFF000CU +#define TEED_ERROR_BUSY 0xFFFF000DU +#define TEED_ERROR_COMMUNICATION 0xFFFF000EU +#define TEED_ERROR_SECURITY 0xFFFF000FU +#define TEED_ERROR_SHORT_BUFFER 0xFFFF0010U + +/* TEE origin codes */ +#define TEED_ORIGIN_DRIVER 0x00000002U +#define TEED_ORIGIN_TEE 0x00000003U +#define TEED_ORIGIN_TEE_APPLICATION 0x00000004U + +#define TEE_UUID_CLOCK_SIZE 8 + +#define TEEC_CONFIG_PAYLOAD_REF_COUNT 4 + +/** + * struct tee_uuid - Structure that represent an uuid. + * @timeLow: The low field of the time stamp. + * @timeMid: The middle field of the time stamp. + * @timeHiAndVersion: The high field of the timestamp multiplexed + * with the version number. + * @clockSeqAndNode: The clock sequence and the node. + * + * This structure have different naming (camel case) to comply with Global + * Platforms TEE Client API spec. This type is defined in RFC4122. + */ +struct tee_uuid { + uint32_t timeLow; + uint16_t timeMid; + uint16_t timeHiAndVersion; + uint8_t clockSeqAndNode[TEE_UUID_CLOCK_SIZE]; +}; + +/** + * struct tee_sharedmemory - Shared memory block for TEE. + * @buffer: The in/out data to TEE. + * @size: The size of the data. + * @flags: Variable telling whether it is a in, out or in/out parameter. + */ +struct tee_sharedmemory { + void *buffer; + size_t size; + uint32_t flags; +}; + +/** + * struct tee_operation - Payload for sessions or invoke operation. + * @shm: Array containing the shared memory buffers. + * @flags: Tells which if memory buffers that are in use. + */ +struct tee_operation { + struct tee_sharedmemory shm[TEEC_CONFIG_PAYLOAD_REF_COUNT]; + uint32_t flags; +}; + +/** + * struct tee_session - The session of an open tee device. + * @state: The current state in the linux kernel. + * @err: Error code (as in Global Platform TEE Client API spec) + * @origin: Origin for the error code (also from spec). + * @id: Implementation defined type, 0 if not used. + * @ta: The trusted application. + * @uuid: The uuid for the trusted application. + * @cmd: The command to be executed in the trusted application. + * @driver_cmd: The command type in the driver. This is used from a client (user + * space to tell the Linux kernel whether it's a open-, + * close-session or if it is an invoke command. + * @ta_size: The size of the trusted application. + * @op: The payload for the trusted application. + * @sync: Mutex to handle multiple use of clients. + * + * This structure is mainly used in the Linux kernel as a session context for + * ongoing operations. Other than that it is also used in the communication with + * the user space. + */ +struct tee_session { + uint32_t state; + uint32_t err; + uint32_t origin; + uint32_t id; + void *ta; + struct tee_uuid *uuid; + unsigned int cmd; + unsigned int driver_cmd; + unsigned int ta_size; + struct tee_operation *op; + struct mutex *sync; +}; + +/** + * struct tee_read - Contains the error message and the origin. + * @err: Error code (as in Global Platform TEE Client API spec) + * @origin: Origin for the error code (also from spec). + * + * This is used by user space when a user space application wants to get more + * information about an error. + */ +struct tee_read { + unsigned int err; /* return value */ + unsigned int origin; /* error origin */ +}; + +/** + * Function that handles the function calls to trusted applications. + * @param ts: The session of a operation to be executed. + * @param sec_cmd: The type of command to be executed, open-, close-session, + * invoke command. + */ +int call_sec_world(struct tee_session *ts, int sec_cmd); + +#endif |