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linux/drivers/tee/optee/optee_smc.h
Jeffrey Kardatzke f3040daab8 tee: optee: Add SMC for loading OP-TEE image 
Adds an SMC call that will pass an OP-TEE binary image to EL3 and
instruct it to load it as the BL32 payload. This works in conjunction
with a feature added to Trusted Firmware for ARMv8 and above
architectures that supports this.

The main purpose of this change is to facilitate updating the OP-TEE
component on devices via a rootfs change rather than having to do a
firmware update. Further details are linked to in the Kconfig file.

Signed-off-by: Jeffrey Kardatzke <jkardatzke@chromium.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jeffrey Kardatzke <jkardatzke@google.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
2023-04-03 08:57:49 +02:00

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/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
/*
* Copyright (c) 2015-2021, Linaro Limited
*/
#ifndef OPTEE_SMC_H
#define OPTEE_SMC_H
#include <linux/arm-smccc.h>
#include <linux/bitops.h>
#define OPTEE_SMC_STD_CALL_VAL(func_num) \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
#define OPTEE_SMC_FAST_CALL_VAL(func_num) \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
/*
* Function specified by SMC Calling convention.
*/
#define OPTEE_SMC_FUNCID_CALLS_COUNT 0xFF00
#define OPTEE_SMC_CALLS_COUNT \
ARM_SMCCC_CALL_VAL(OPTEE_SMC_FAST_CALL, SMCCC_SMC_32, \
SMCCC_OWNER_TRUSTED_OS_END, \
OPTEE_SMC_FUNCID_CALLS_COUNT)
/*
* Normal cached memory (write-back), shareable for SMP systems and not
* shareable for UP systems.
*/
#define OPTEE_SMC_SHM_CACHED 1
/*
* a0..a7 is used as register names in the descriptions below, on arm32
* that translates to r0..r7 and on arm64 to w0..w7. In both cases it's
* 32-bit registers.
*/
/*
* Function specified by SMC Calling convention
*
* Return the following UID if using API specified in this file
* without further extensions:
* 384fb3e0-e7f8-11e3-af63-0002a5d5c51b.
* see also OPTEE_MSG_UID_* in optee_msg.h
*/
#define OPTEE_SMC_FUNCID_CALLS_UID OPTEE_MSG_FUNCID_CALLS_UID
#define OPTEE_SMC_CALLS_UID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_TRUSTED_OS_END, \
OPTEE_SMC_FUNCID_CALLS_UID)
/*
* Function specified by SMC Calling convention
*
* Returns 2.0 if using API specified in this file without further extensions.
* see also OPTEE_MSG_REVISION_* in optee_msg.h
*/
#define OPTEE_SMC_FUNCID_CALLS_REVISION OPTEE_MSG_FUNCID_CALLS_REVISION
#define OPTEE_SMC_CALLS_REVISION \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_TRUSTED_OS_END, \
OPTEE_SMC_FUNCID_CALLS_REVISION)
struct optee_smc_calls_revision_result {
unsigned long major;
unsigned long minor;
unsigned long reserved0;
unsigned long reserved1;
};
/*
* 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 a0-4 in the same way as OPTEE_SMC_CALLS_UID
* described above.
*/
#define OPTEE_SMC_FUNCID_GET_OS_UUID OPTEE_MSG_FUNCID_GET_OS_UUID
#define OPTEE_SMC_CALL_GET_OS_UUID \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_UUID)
/*
* 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 a0-1 in the same way as OPTEE_SMC_CALLS_REVISION
* described above. May optionally return a 32-bit build identifier in a2,
* with zero meaning unspecified.
*/
#define OPTEE_SMC_FUNCID_GET_OS_REVISION OPTEE_MSG_FUNCID_GET_OS_REVISION
#define OPTEE_SMC_CALL_GET_OS_REVISION \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_REVISION)
struct optee_smc_call_get_os_revision_result {
unsigned long major;
unsigned long minor;
unsigned long build_id;
unsigned long reserved1;
};
/*
* Load Trusted OS from optee/tee.bin in the Linux firmware.
*
* WARNING: Use this cautiously as it could lead to insecure loading of the
* Trusted OS.
* This SMC instructs EL3 to load a binary and execute it as the Trusted OS.
*
* Call register usage:
* a0 SMC Function ID, OPTEE_SMC_CALL_LOAD_IMAGE
* a1 Upper 32bit of a 64bit size for the payload
* a2 Lower 32bit of a 64bit size for the payload
* a3 Upper 32bit of the physical address for the payload
* a4 Lower 32bit of the physical address for the payload
*
* The payload is in the OP-TEE image format.
*
* Returns result in a0, 0 on success and an error code otherwise.
*/
#define OPTEE_SMC_FUNCID_LOAD_IMAGE 2
#define OPTEE_SMC_CALL_LOAD_IMAGE \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_TRUSTED_OS_END, \
OPTEE_SMC_FUNCID_LOAD_IMAGE)
/*
* Call with struct optee_msg_arg as argument
*
* When called with OPTEE_SMC_CALL_WITH_RPC_ARG or
* OPTEE_SMC_CALL_WITH_REGD_ARG in a0 there is one RPC struct optee_msg_arg
* following after the first struct optee_msg_arg. The RPC struct
* optee_msg_arg has reserved space for the number of RPC parameters as
* returned by OPTEE_SMC_EXCHANGE_CAPABILITIES.
*
* When calling these functions, normal world has a few responsibilities:
* 1. It must be able to handle eventual RPCs
* 2. Non-secure interrupts should not be masked
* 3. If asynchronous notifications has been negotiated successfully, then
* the interrupt for asynchronous notifications should be unmasked
* during this call.
*
* Call register usage, OPTEE_SMC_CALL_WITH_ARG and
* OPTEE_SMC_CALL_WITH_RPC_ARG:
* a0 SMC Function ID, OPTEE_SMC_CALL_WITH_ARG or OPTEE_SMC_CALL_WITH_RPC_ARG
* a1 Upper 32 bits of a 64-bit physical pointer to a struct optee_msg_arg
* a2 Lower 32 bits of a 64-bit physical pointer to a struct optee_msg_arg
* a3 Cache settings, not used if physical pointer is in a predefined shared
* memory area else per OPTEE_SMC_SHM_*
* a4-6 Not used
* a7 Hypervisor Client ID register
*
* Call register usage, OPTEE_SMC_CALL_WITH_REGD_ARG:
* a0 SMC Function ID, OPTEE_SMC_CALL_WITH_REGD_ARG
* a1 Upper 32 bits of a 64-bit shared memory cookie
* a2 Lower 32 bits of a 64-bit shared memory cookie
* a3 Offset of the struct optee_msg_arg in the shared memory with the
* supplied cookie
* a4-6 Not used
* a7 Hypervisor Client ID register
*
* Normal return register usage:
* a0 Return value, OPTEE_SMC_RETURN_*
* a1-3 Not used
* a4-7 Preserved
*
* OPTEE_SMC_RETURN_ETHREAD_LIMIT return register usage:
* a0 Return value, OPTEE_SMC_RETURN_ETHREAD_LIMIT
* a1-3 Preserved
* a4-7 Preserved
*
* RPC return register usage:
* a0 Return value, OPTEE_SMC_RETURN_IS_RPC(val)
* a1-2 RPC parameters
* a3-7 Resume information, must be preserved
*
* Possible return values:
* OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this
* function.
* OPTEE_SMC_RETURN_OK Call completed, result updated in
* the previously supplied struct
* optee_msg_arg.
* OPTEE_SMC_RETURN_ETHREAD_LIMIT Number of Trusted OS threads exceeded,
* try again later.
* OPTEE_SMC_RETURN_EBADADDR Bad physical pointer to struct
* optee_msg_arg.
* OPTEE_SMC_RETURN_EBADCMD Bad/unknown cmd in struct optee_msg_arg
* OPTEE_SMC_RETURN_IS_RPC() Call suspended by RPC call to normal
* world.
*/
#define OPTEE_SMC_FUNCID_CALL_WITH_ARG OPTEE_MSG_FUNCID_CALL_WITH_ARG
#define OPTEE_SMC_CALL_WITH_ARG \
OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_ARG)
#define OPTEE_SMC_CALL_WITH_RPC_ARG \
OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_RPC_ARG)
#define OPTEE_SMC_CALL_WITH_REGD_ARG \
OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG)
/*
* Get Shared Memory Config
*
* Returns the Secure/Non-secure shared memory config.
*
* Call register usage:
* a0 SMC Function ID, OPTEE_SMC_GET_SHM_CONFIG
* a1-6 Not used
* a7 Hypervisor Client ID register
*
* Have config return register usage:
* a0 OPTEE_SMC_RETURN_OK
* a1 Physical address of start of SHM
* a2 Size of SHM
* a3 Cache settings of memory, as defined by the
* OPTEE_SMC_SHM_* values above
* a4-7 Preserved
*
* Not available register usage:
* a0 OPTEE_SMC_RETURN_ENOTAVAIL
* a1-3 Not used
* a4-7 Preserved
*/
#define OPTEE_SMC_FUNCID_GET_SHM_CONFIG 7
#define OPTEE_SMC_GET_SHM_CONFIG \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SHM_CONFIG)
struct optee_smc_get_shm_config_result {
unsigned long status;
unsigned long start;
unsigned long size;
unsigned long settings;
};
/*
* Exchanges capabilities between normal world and secure world
*
* Call register usage:
* a0 SMC Function ID, OPTEE_SMC_EXCHANGE_CAPABILITIES
* a1 bitfield of normal world capabilities OPTEE_SMC_NSEC_CAP_*
* a2-6 Not used
* a7 Hypervisor Client ID register
*
* Normal return register usage:
* a0 OPTEE_SMC_RETURN_OK
* a1 bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
* a2 The maximum secure world notification number
* a3 Bit[7:0]: Number of parameters needed for RPC to be supplied
* as the second MSG arg struct for
* OPTEE_SMC_CALL_WITH_ARG
* Bit[31:8]: Reserved (MBZ)
* a4-7 Preserved
*
* Error return register usage:
* a0 OPTEE_SMC_RETURN_ENOTAVAIL, can't use the capabilities from normal world
* a1 bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
* a2-7 Preserved
*/
/* Normal world works as a uniprocessor system */
#define OPTEE_SMC_NSEC_CAP_UNIPROCESSOR BIT(0)
/* Secure world has reserved shared memory for normal world to use */
#define OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM BIT(0)
/* Secure world can communicate via previously unregistered shared memory */
#define OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM BIT(1)
/*
* Secure world supports commands "register/unregister shared memory",
* secure world accepts command buffers located in any parts of non-secure RAM
*/
#define OPTEE_SMC_SEC_CAP_DYNAMIC_SHM BIT(2)
/* Secure world is built with virtualization support */
#define OPTEE_SMC_SEC_CAP_VIRTUALIZATION BIT(3)
/* Secure world supports Shared Memory with a NULL reference */
#define OPTEE_SMC_SEC_CAP_MEMREF_NULL BIT(4)
/* Secure world supports asynchronous notification of normal world */
#define OPTEE_SMC_SEC_CAP_ASYNC_NOTIF BIT(5)
/* Secure world supports pre-allocating RPC arg struct */
#define OPTEE_SMC_SEC_CAP_RPC_ARG BIT(6)
#define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9
#define OPTEE_SMC_EXCHANGE_CAPABILITIES \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES)
struct optee_smc_exchange_capabilities_result {
unsigned long status;
unsigned long capabilities;
unsigned long max_notif_value;
unsigned long data;
};
/*
* Disable and empties cache of shared memory objects
*
* Secure world can cache frequently used shared memory objects, for
* example objects used as RPC arguments. When secure world is idle this
* function returns one shared memory reference to free. To disable the
* cache and free all cached objects this function has to be called until
* it returns OPTEE_SMC_RETURN_ENOTAVAIL.
*
* Call register usage:
* a0 SMC Function ID, OPTEE_SMC_DISABLE_SHM_CACHE
* a1-6 Not used
* a7 Hypervisor Client ID register
*
* Normal return register usage:
* a0 OPTEE_SMC_RETURN_OK
* a1 Upper 32 bits of a 64-bit Shared memory cookie
* a2 Lower 32 bits of a 64-bit Shared memory cookie
* a3-7 Preserved
*
* Cache empty return register usage:
* a0 OPTEE_SMC_RETURN_ENOTAVAIL
* a1-7 Preserved
*
* Not idle return register usage:
* a0 OPTEE_SMC_RETURN_EBUSY
* a1-7 Preserved
*/
#define OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE 10
#define OPTEE_SMC_DISABLE_SHM_CACHE \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE)
struct optee_smc_disable_shm_cache_result {
unsigned long status;
unsigned long shm_upper32;
unsigned long shm_lower32;
unsigned long reserved0;
};
/*
* Enable cache of shared memory objects
*
* Secure world can cache frequently used shared memory objects, for
* example objects used as RPC arguments. When secure world is idle this
* function returns OPTEE_SMC_RETURN_OK and the cache is enabled. If
* secure world isn't idle OPTEE_SMC_RETURN_EBUSY is returned.
*
* Call register usage:
* a0 SMC Function ID, OPTEE_SMC_ENABLE_SHM_CACHE
* a1-6 Not used
* a7 Hypervisor Client ID register
*
* Normal return register usage:
* a0 OPTEE_SMC_RETURN_OK
* a1-7 Preserved
*
* Not idle return register usage:
* a0 OPTEE_SMC_RETURN_EBUSY
* a1-7 Preserved
*/
#define OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE 11
#define OPTEE_SMC_ENABLE_SHM_CACHE \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE)
/*
* Query OP-TEE about number of supported threads
*
* Normal World OS or Hypervisor issues this call to find out how many
* threads OP-TEE supports. That is how many standard calls can be issued
* in parallel before OP-TEE will return OPTEE_SMC_RETURN_ETHREAD_LIMIT.
*
* Call requests usage:
* a0 SMC Function ID, OPTEE_SMC_GET_THREAD_COUNT
* a1-6 Not used
* a7 Hypervisor Client ID register
*
* Normal return register usage:
* a0 OPTEE_SMC_RETURN_OK
* a1 Number of threads
* a2-7 Preserved
*
* Error return:
* a0 OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Requested call is not implemented
* a1-7 Preserved
*/
#define OPTEE_SMC_FUNCID_GET_THREAD_COUNT 15
#define OPTEE_SMC_GET_THREAD_COUNT \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_THREAD_COUNT)
/*
* Inform OP-TEE that normal world is able to receive asynchronous
* notifications.
*
* Call requests usage:
* a0 SMC Function ID, OPTEE_SMC_ENABLE_ASYNC_NOTIF
* a1-6 Not used
* a7 Hypervisor Client ID register
*
* Normal return register usage:
* a0 OPTEE_SMC_RETURN_OK
* a1-7 Preserved
*
* Not supported return register usage:
* a0 OPTEE_SMC_RETURN_ENOTAVAIL
* a1-7 Preserved
*/
#define OPTEE_SMC_FUNCID_ENABLE_ASYNC_NOTIF 16
#define OPTEE_SMC_ENABLE_ASYNC_NOTIF \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_ENABLE_ASYNC_NOTIF)
/*
* Retrieve a value of notifications pending since the last call of this
* function.
*
* OP-TEE keeps a record of all posted values. When an interrupt is
* received which indicates that there are posted values this function
* should be called until all pended values have been retrieved. When a
* value is retrieved, it's cleared from the record in secure world.
*
* It is expected that this function is called from an interrupt handler
* in normal world.
*
* Call requests usage:
* a0 SMC Function ID, OPTEE_SMC_GET_ASYNC_NOTIF_VALUE
* a1-6 Not used
* a7 Hypervisor Client ID register
*
* Normal return register usage:
* a0 OPTEE_SMC_RETURN_OK
* a1 value
* a2 Bit[0]: OPTEE_SMC_ASYNC_NOTIF_VALUE_VALID if the value in a1 is
* valid, else 0 if no values where pending
* a2 Bit[1]: OPTEE_SMC_ASYNC_NOTIF_VALUE_PENDING if another value is
* pending, else 0.
* Bit[31:2]: MBZ
* a3-7 Preserved
*
* Not supported return register usage:
* a0 OPTEE_SMC_RETURN_ENOTAVAIL
* a1-7 Preserved
*/
#define OPTEE_SMC_ASYNC_NOTIF_VALUE_VALID BIT(0)
#define OPTEE_SMC_ASYNC_NOTIF_VALUE_PENDING BIT(1)
/*
* Notification that OP-TEE expects a yielding call to do some bottom half
* work in a driver.
*/
#define OPTEE_SMC_ASYNC_NOTIF_VALUE_DO_BOTTOM_HALF 0
#define OPTEE_SMC_FUNCID_GET_ASYNC_NOTIF_VALUE 17
#define OPTEE_SMC_GET_ASYNC_NOTIF_VALUE \
OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_ASYNC_NOTIF_VALUE)
/* See OPTEE_SMC_CALL_WITH_RPC_ARG above */
#define OPTEE_SMC_FUNCID_CALL_WITH_RPC_ARG 18
/* See OPTEE_SMC_CALL_WITH_REGD_ARG above */
#define OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG 19
/*
* Resume from RPC (for example after processing a foreign interrupt)
*
* Call register usage:
* a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC
* a1-3 Value of a1-3 when OPTEE_SMC_CALL_WITH_ARG returned
* OPTEE_SMC_RETURN_RPC in a0
*
* Return register usage is the same as for OPTEE_SMC_*CALL_WITH_ARG above.
*
* Possible return values
* OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this
* function.
* OPTEE_SMC_RETURN_OK Original call completed, result
* updated in the previously supplied.
* struct optee_msg_arg
* OPTEE_SMC_RETURN_RPC Call suspended by RPC call to normal
* world.
* OPTEE_SMC_RETURN_ERESUME Resume failed, the opaque resume
* information was corrupt.
*/
#define OPTEE_SMC_FUNCID_RETURN_FROM_RPC 3
#define OPTEE_SMC_CALL_RETURN_FROM_RPC \
OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_RETURN_FROM_RPC)
#define OPTEE_SMC_RETURN_RPC_PREFIX_MASK 0xFFFF0000
#define OPTEE_SMC_RETURN_RPC_PREFIX 0xFFFF0000
#define OPTEE_SMC_RETURN_RPC_FUNC_MASK 0x0000FFFF
#define OPTEE_SMC_RETURN_GET_RPC_FUNC(ret) \
((ret) & OPTEE_SMC_RETURN_RPC_FUNC_MASK)
#define OPTEE_SMC_RPC_VAL(func) ((func) | OPTEE_SMC_RETURN_RPC_PREFIX)
/*
* Allocate memory for RPC parameter passing. The memory is used to hold a
* struct optee_msg_arg.
*
* "Call" register usage:
* a0 This value, OPTEE_SMC_RETURN_RPC_ALLOC
* a1 Size in bytes of required argument memory
* a2 Not used
* a3 Resume information, must be preserved
* a4-5 Not used
* a6-7 Resume information, must be preserved
*
* "Return" register usage:
* a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
* a1 Upper 32 bits of 64-bit physical pointer to allocated
* memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
* be allocated.
* a2 Lower 32 bits of 64-bit physical pointer to allocated
* memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
* be allocated
* a3 Preserved
* a4 Upper 32 bits of 64-bit Shared memory cookie used when freeing
* the memory or doing an RPC
* a5 Lower 32 bits of 64-bit Shared memory cookie used when freeing
* the memory or doing an RPC
* a6-7 Preserved
*/
#define OPTEE_SMC_RPC_FUNC_ALLOC 0
#define OPTEE_SMC_RETURN_RPC_ALLOC \
OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_ALLOC)
/*
* Free memory previously allocated by OPTEE_SMC_RETURN_RPC_ALLOC
*
* "Call" register usage:
* a0 This value, OPTEE_SMC_RETURN_RPC_FREE
* a1 Upper 32 bits of 64-bit shared memory cookie belonging to this
* argument memory
* a2 Lower 32 bits of 64-bit shared memory cookie belonging to this
* argument memory
* a3-7 Resume information, must be preserved
*
* "Return" register usage:
* a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
* a1-2 Not used
* a3-7 Preserved
*/
#define OPTEE_SMC_RPC_FUNC_FREE 2
#define OPTEE_SMC_RETURN_RPC_FREE \
OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FREE)
/*
* Deliver a foreign interrupt in normal world.
*
* "Call" register usage:
* a0 OPTEE_SMC_RETURN_RPC_FOREIGN_INTR
* a1-7 Resume information, must be preserved
*
* "Return" register usage:
* a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
* a1-7 Preserved
*/
#define OPTEE_SMC_RPC_FUNC_FOREIGN_INTR 4
#define OPTEE_SMC_RETURN_RPC_FOREIGN_INTR \
OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FOREIGN_INTR)
/*
* Do an RPC request. The supplied struct optee_msg_arg tells which
* request to do and the parameters for the request. The following fields
* are used (the rest are unused):
* - cmd the Request ID
* - ret return value of the request, filled in by normal world
* - num_params number of parameters for the request
* - params the parameters
* - param_attrs attributes of the parameters
*
* "Call" register usage:
* a0 OPTEE_SMC_RETURN_RPC_CMD
* a1 Upper 32 bits of a 64-bit Shared memory cookie holding a
* struct optee_msg_arg, must be preserved, only the data should
* be updated
* a2 Lower 32 bits of a 64-bit Shared memory cookie holding a
* struct optee_msg_arg, must be preserved, only the data should
* be updated
* a3-7 Resume information, must be preserved
*
* "Return" register usage:
* a0 SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
* a1-2 Not used
* a3-7 Preserved
*/
#define OPTEE_SMC_RPC_FUNC_CMD 5
#define OPTEE_SMC_RETURN_RPC_CMD \
OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_CMD)
/* Returned in a0 */
#define OPTEE_SMC_RETURN_UNKNOWN_FUNCTION 0xFFFFFFFF
/* Returned in a0 only from Trusted OS functions */
#define OPTEE_SMC_RETURN_OK 0x0
#define OPTEE_SMC_RETURN_ETHREAD_LIMIT 0x1
#define OPTEE_SMC_RETURN_EBUSY 0x2
#define OPTEE_SMC_RETURN_ERESUME 0x3
#define OPTEE_SMC_RETURN_EBADADDR 0x4
#define OPTEE_SMC_RETURN_EBADCMD 0x5
#define OPTEE_SMC_RETURN_ENOMEM 0x6
#define OPTEE_SMC_RETURN_ENOTAVAIL 0x7
#define OPTEE_SMC_RETURN_IS_RPC(ret) __optee_smc_return_is_rpc((ret))
static inline bool __optee_smc_return_is_rpc(u32 ret)
{
return ret != OPTEE_SMC_RETURN_UNKNOWN_FUNCTION &&
(ret & OPTEE_SMC_RETURN_RPC_PREFIX_MASK) ==
OPTEE_SMC_RETURN_RPC_PREFIX;
}
#endif /* OPTEE_SMC_H */
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