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tee: add register user memory

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Added new ioctl to allow users register own buffers as a shared memory.

Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
[jw: moved tee_shm_is_registered() declaration]
[jw: added space after __tee_shm_alloc() implementation]
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Jens Wiklander
2017-11-29 14:48:26 +02:00
parent e2aca5d892
commit 033ddf12bc
4 changed files with 294 additions and 30 deletions
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30
include/uapi/linux/tee.h
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@@ -50,6 +50,7 @@
#define TEE_GEN_CAP_GP (1 << 0)/* GlobalPlatform compliant TEE */
#define TEE_GEN_CAP_PRIVILEGED (1 << 1)/* Privileged device (for supplicant) */
#define TEE_GEN_CAP_REG_MEM (1 << 2)/* Supports registering shared memory */
/*
* TEE Implementation ID
@@ -332,6 +333,35 @@ struct tee_iocl_supp_send_arg {
#define TEE_IOC_SUPPL_SEND _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 7, \
struct tee_ioctl_buf_data)
/**
* struct tee_ioctl_shm_register_data - Shared memory register argument
* @addr: [in] Start address of shared memory to register
* @length: [in/out] Length of shared memory to register
* @flags: [in/out] Flags to/from registration.
* @id: [out] Identifier of the shared memory
*
* The flags field should currently be zero as input. Updated by the call
* with actual flags as defined by TEE_IOCTL_SHM_* above.
* This structure is used as argument for TEE_IOC_SHM_REGISTER below.
*/
struct tee_ioctl_shm_register_data {
__u64 addr;
__u64 length;
__u32 flags;
__s32 id;
};
/**
* TEE_IOC_SHM_REGISTER - Register shared memory argument
*
* Registers shared memory between the user space process and secure OS.
*
* Returns a file descriptor on success or < 0 on failure
*
* The shared memory is unregisterred when the descriptor is closed.
*/
#define TEE_IOC_SHM_REGISTER _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 9, \
struct tee_ioctl_shm_register_data)
/*
* Five syscalls are used when communicating with the TEE driver.
* open(): opens the device associated with the driver