METHOD, COMPUTER PROGRAM, AND COMPUTER FOR RESTORING SET OF VARIABLES

摘要

A set of variables referred to by unified extensible firmware interface (UEFI) firmware is restored. The UEFI firmware stored in a read-only memory (ROM) is firstly executed after power-up. The UEFI firmware writes a variable set related to boot, into a variable area. As an operating system (OS) also writes a set of variables into the variable area, the boot-related variable set may be altered. The variable set is saved into a prescribed area, such as a universal serial bus (USB) memory key, when the computer boots normally. If alteration of the variable set in the reference area is detected during a boot of the computer, the variable set in the reference area is replaced with the saved variable set. The variable set alteration may be detected using a detection flag which is set immediately after a boot is started and reset immediately before an OS is loaded.

主权项

1. A method comprising:
writing a set of variables into a reference area of system firmware firstly executed by a computer after power-up; saving, into a prescribed area, the set of variables at the time when the computer was booted normally; detecting, by the computer, during a boot of the computer, whether the set of variables in the reference area has been altered; and replacing, by the computer, the set of variables in the reference area with the saved set of variables, in response to detecting that the set of variables was altered.