BACKPORT: tee: optee: add shared buffer registration functions
This change adds ops for shm_(un)register functions in tee interface. Client application can use these functions to (un)register an own shared buffer in OP-TEE address space. This allows zero copy data sharing between Normal and Secure Worlds. Please note that while those functions were added to optee code, it does not report to userspace that those functions are available. OP-TEE code does not set TEE_GEN_CAP_REG_MEM flag. This flag will be enabled only after all other features of dynamic shared memory will be implemented in subsequent patches. Of course user can ignore presence of TEE_GEN_CAP_REG_MEM flag and try do call those functions. This is okay, driver will register shared buffer in OP-TEE, but any attempts to use this shared buffer will fail. Change-Id: I918fd93ff2a5e8a371f6e7fd81f45bbfaed69315 Signed-off-by:Volodymyr Babchuk <vlad.babchuk@gmail.com> Signed-off-by:
Jens Wiklander <jens.wiklander@linaro.org> (cherry picked from commit 06ca79179c4e00efe53cfe43456f1586f944f04f) Signed-off-by:
Victor Chong <victor.chong@linaro.org>
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