Electronic device including access control identifiers for controlling access to peripherals

A method, comprising:

• in an electronic device including a transaction host, a first peripheral, a second peripheral, and an access control register, storing in the access control register (a) a first access control identifier for the first peripheral and (b) a second access control identifier for the second peripheral;
• executing firmware, by the transaction host, to program the first and second access control identifiers, including:
• for a privileged mode operation of the transaction host, setting both the first and second access control identifiers to an access-allowed setting respectively allowing access to both the first peripheral and the second peripheral by the transaction host;
• for a first user mode operation of the transaction host for performing operations related to the first peripheral, setting the first access control identifier to the access-allowed setting and setting the second access control identifier to an access-prevented setting preventing access to the second peripheral;
• and
• for a second user mode operation of the transaction host for performing operations related to the second peripheral, setting the first access control identifier to the access-prevented setting and setting the second access control identifier to an access-allowed setting;
• receiving, by a first access controller associated with the first peripheral, a request for access to the first peripheral by the transaction host;
• performing an access determination, by the first access controller, to allow or prevent access to the first peripheral based at least on (a) the first access control identifier for the first peripheral and (b) an operating mode signal indicating either the privileged mode operation, the first user mode operation, or the second user mode operation;
• and
• allowing or preventing access to the first peripheral based on the access determination.

A method, comprising:

• in an electronic device including a transaction host, a first peripheral, a second peripheral and an access control register, storing in the access control register a first access control identifier for the first peripheral and a second access control identifier for the second peripheral;
• the transaction host setting the first access control identifier and the second access control identifier to allow access to the first peripheral and the second peripheral, respectively;
• to perform a privileged mode operation at a first time, the transaction host executing firmware to set both the first and second access control identifiers to an access-allowed setting to allow access to both the first peripheral and the second peripheral by the transaction host;
• to perform a first user mode operation related to the first peripheral at a second time, the transaction host executing the firmware to:
• program the first access control identifier to an access-allowed setting to allow access to the first peripheral by the transaction host;
• and
• program the second access control identifier to an access-prevented setting to prevent access to the second peripheral by the transaction host;
• and
• to perform a second user mode operation related to the second peripheral at a third time, the transaction host executing the firmware to:
• program the first access control identifier to an access-prevented setting to prevent access to the first peripheral by the transaction host;
• and
• program the second access control identifier to an access-allowed setting to allow access to the second peripheral by the transaction host.