164 lines
5.4 KiB
C
164 lines
5.4 KiB
C
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/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (c) 2019-2021, Linaro Limited
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*/
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/*
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* This file is exported by OP-TEE and is kept in sync between secure world
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* and normal world drivers. We're using ARM FF-A 1.0 specification.
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*/
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#ifndef __OPTEE_FFA_H
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#define __OPTEE_FFA_H
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#include <linux/arm_ffa.h>
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/*
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* Normal world sends requests with FFA_MSG_SEND_DIRECT_REQ and
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* responses are returned with FFA_MSG_SEND_DIRECT_RESP for normal
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* messages.
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*
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* All requests with FFA_MSG_SEND_DIRECT_REQ and FFA_MSG_SEND_DIRECT_RESP
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* are using the AArch32 SMC calling convention with register usage as
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* defined in FF-A specification:
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* w0: Function ID (0x8400006F or 0x84000070)
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* w1: Source/Destination IDs
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* w2: Reserved (MBZ)
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* w3-w7: Implementation defined, free to be used below
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*/
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#define OPTEE_FFA_VERSION_MAJOR 1
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#define OPTEE_FFA_VERSION_MINOR 0
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#define OPTEE_FFA_BLOCKING_CALL(id) (id)
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#define OPTEE_FFA_YIELDING_CALL_BIT 31
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#define OPTEE_FFA_YIELDING_CALL(id) ((id) | BIT(OPTEE_FFA_YIELDING_CALL_BIT))
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/*
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* Returns the API version implemented, currently follows the FF-A version.
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* Call register usage:
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* w3: Service ID, OPTEE_FFA_GET_API_VERSION
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* w4-w7: Not used (MBZ)
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*
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* Return register usage:
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* w3: OPTEE_FFA_VERSION_MAJOR
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* w4: OPTEE_FFA_VERSION_MINOR
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* w5-w7: Not used (MBZ)
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*/
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#define OPTEE_FFA_GET_API_VERSION OPTEE_FFA_BLOCKING_CALL(0)
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/*
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* Returns the revision of OP-TEE.
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*
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* Used by non-secure world to figure out which version of the Trusted OS
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* is installed. Note that the returned revision is the revision of the
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* Trusted OS, not of the API.
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*
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* Call register usage:
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* w3: Service ID, OPTEE_FFA_GET_OS_VERSION
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* w4-w7: Unused (MBZ)
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*
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* Return register usage:
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* w3: CFG_OPTEE_REVISION_MAJOR
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* w4: CFG_OPTEE_REVISION_MINOR
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* w5: TEE_IMPL_GIT_SHA1 (or zero if not supported)
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*/
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#define OPTEE_FFA_GET_OS_VERSION OPTEE_FFA_BLOCKING_CALL(1)
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/*
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* Exchange capabilities between normal world and secure world.
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*
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* Currently there are no defined capabilities. When features are added new
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* capabilities may be added.
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*
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* Call register usage:
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* w3: Service ID, OPTEE_FFA_EXCHANGE_CAPABILITIES
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* w4-w7: Note used (MBZ)
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*
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* Return register usage:
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* w3: Error code, 0 on success
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* w4: Bit[7:0]: Number of parameters needed for RPC to be supplied
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* as the second MSG arg struct for
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* OPTEE_FFA_YIELDING_CALL_WITH_ARG.
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* Bit[31:8]: Reserved (MBZ)
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* w5: Bitfield of secure world capabilities OPTEE_FFA_SEC_CAP_* below,
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* unused bits MBZ.
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* w6-w7: Not used (MBZ)
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*/
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/*
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* Secure world supports giving an offset into the argument shared memory
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* object, see also OPTEE_FFA_YIELDING_CALL_WITH_ARG
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*/
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#define OPTEE_FFA_SEC_CAP_ARG_OFFSET BIT(0)
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#define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2)
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/*
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* Unregister shared memory
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*
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* Call register usage:
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* w3: Service ID, OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM
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* w4: Shared memory handle, lower bits
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* w5: Shared memory handle, higher bits
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* w6-w7: Not used (MBZ)
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*
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* Return register usage:
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* w3: Error code, 0 on success
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* w4-w7: Note used (MBZ)
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*/
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#define OPTEE_FFA_UNREGISTER_SHM OPTEE_FFA_BLOCKING_CALL(3)
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/*
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* Call with struct optee_msg_arg as argument in the supplied shared memory
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* with a zero internal offset and normal cached memory attributes.
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* Register usage:
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* w3: Service ID, OPTEE_FFA_YIELDING_CALL_WITH_ARG
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* w4: Lower 32 bits of a 64-bit Shared memory handle
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* w5: Upper 32 bits of a 64-bit Shared memory handle
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* w6: Offset into shared memory pointing to a struct optee_msg_arg
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* right after the parameters of this struct (at offset
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* OPTEE_MSG_GET_ARG_SIZE(num_params) follows a struct optee_msg_arg
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* for RPC, this struct has reserved space for the number of RPC
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* parameters as returned by OPTEE_FFA_EXCHANGE_CAPABILITIES.
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* MBZ unless the bit OPTEE_FFA_SEC_CAP_ARG_OFFSET is received with
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* OPTEE_FFA_EXCHANGE_CAPABILITIES.
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* w7: Not used (MBZ)
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* Resume from RPC. Register usage:
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* w3: Service ID, OPTEE_FFA_YIELDING_CALL_RESUME
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* w4-w6: Not used (MBZ)
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* w7: Resume info
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*
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* Normal return (yielding call is completed). Register usage:
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* w3: Error code, 0 on success
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* w4: OPTEE_FFA_YIELDING_CALL_RETURN_DONE
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* w5-w7: Not used (MBZ)
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*
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* RPC interrupt return (RPC from secure world). Register usage:
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* w3: Error code == 0
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* w4: Any defined RPC code but OPTEE_FFA_YIELDING_CALL_RETURN_DONE
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* w5-w6: Not used (MBZ)
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* w7: Resume info
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*
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* Possible error codes in register w3:
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* 0: Success
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* FFA_DENIED: w4 isn't one of OPTEE_FFA_YIELDING_CALL_START
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* OPTEE_FFA_YIELDING_CALL_RESUME
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*
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* Possible error codes for OPTEE_FFA_YIELDING_CALL_START,
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* FFA_BUSY: Number of OP-TEE OS threads exceeded,
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* try again later
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* FFA_DENIED: RPC shared memory object not found
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* FFA_INVALID_PARAMETER: Bad shared memory handle or offset into the memory
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*
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* Possible error codes for OPTEE_FFA_YIELDING_CALL_RESUME
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* FFA_INVALID_PARAMETER: Bad resume info
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*/
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#define OPTEE_FFA_YIELDING_CALL_WITH_ARG OPTEE_FFA_YIELDING_CALL(0)
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#define OPTEE_FFA_YIELDING_CALL_RESUME OPTEE_FFA_YIELDING_CALL(1)
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#define OPTEE_FFA_YIELDING_CALL_RETURN_DONE 0
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#define OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD 1
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#define OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT 2
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#endif /*__OPTEE_FFA_H*/
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