# Device access control

Source: [https://docs.qualcomm.com/doc/80-88500-4/topic/82_Device_access_control.html](https://docs.qualcomm.com/doc/80-88500-4/topic/82_Device_access_control.html)

The device access control is handled by xPU, which is a hardware block monitoring
    memory resources access at the slave side.

The hardware extended protection unit (xPU) support is provided for enforcing the slave side
      access control for register, fixed address, or dynamic memory regions.

Figure : Master-Slave interaction using XPU
      
      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)

It is the combination of multiple security blocks known as protection units, which protect memory resources from unauthorized access.

- The xPU units are:
    - Memory protection unit (MPU) – Protects a software defined memory region
    - Address protection unit (APU) – Protects a pre-decoded address region
    - Register protection unit (RPU) – Protects a group of register(s)
- The xPU definition is configurable at compile time.
- Master conditionally granted access to resource based on security attribute, such as:
    - VMID
    - xMssSelfAuth
- The xPU configuration follows the Arm architecture security extensions:
    - Some configuration registers are for secure access only
    - Non-secure configuration access controlled by secure side
    - Support for MSA feature. xMssSelfAuth identifies MSA traffic

The xPU is configurable via device configuration files and these configurations get compiled as
      part of devcfg.mbn image, which are later parsed and programmed in the xPU registers by
      TZ.

The xPU can be enabled or disabled via device configuration in xpu\_config.xml.

    <device id="/ac/xpu">
    <props name="disable_xpu_ac" type=DALPROP_ATTR_TYPE_UINT32>	0</props>
    </device>
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**Parent Topic:** [Security](https://docs.qualcomm.com/doc/80-88500-4/topic/76_Security.html)

Last Published: Aug 18, 2023

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