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- Introduction:
- =============
- Invoke driver is a misc driver which helps communication between non secure
- and secure world. Invoke driver communicates with secure side using SCM
- driver. To use invoke driver, open must be called on invoke device i.e.
- /dev/invoke. Invoke driver exposes only one IOCTL invoke which passes
- userspace request to TZ.
- SW Architecture
- ===============
- Following is SW stack for Invoke driver.
- +++++++++++++++++++++++++++++++++++++++++
- + Applications +
- +++++++++++++++++++++++++++++++++++++++++
- + System Layer +
- +++++++++++++++++++++++++++++++++++++++++
- + Kernel +
- + +++++++++++++++++++ +
- + + Invoke driver + +
- + +++++++++++++++++++ +
- + + SCM Driver + +
- +++++++++++++++++++++++++++++++++++++++++
- ||
- ||
- \/
- +++++++++++++++++++++++++++++++++++++++++
- + Trust Zone +
- + +++++++++++ +++++++++++ +
- + + TZ App1 + + TZ App2 + +
- +++++++++++++++++++++++++++++++++++++++++
- Interfaces
- ==========
- Invoke driver exposes INVOKE_IOCTL_INVOKE_REQ IOCTL for userspace to
- communicate with driver. More details of IOCTL are avilable in
- corresponding header file.
- Driver Parameters
- =================
- This driver is built and statically linked into the kernel; therefore,
- there are no module parameters supported by this driver.
- There are no kernel command line parameters supported by this driver.
- Power Management
- ================
- TBD
- Dependencies
- ============
- Invoke driver depends on SCM driver to communicate with TZ.
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