System Management Mode (SMM, sometimes called ring −2 in reference to protection rings) is an operating mode of x86 central processor units (CPUs) in which...

computer's power management system to take the opportunity to reduce overall power consumption by placing the link PHY into a low-power mode and instructing...

In x86 computing, unreal mode, also big real mode, flat real mode, or voodoo mode is a variant of real mode, in which one or more segment descriptors has...

system is in the S3 state. Thus, it was considered a layer below the System Management Mode rootkits.) For the vulnerable Q35 chipset, a keystroke logger ME-based...

operating systems and some legacy option ROMs that do not support UEFI to still be used. It also provides required legacy System Management Mode (SMM) functionality...

protected mode, also called protected virtual address mode, is an operational mode of x86-compatible central processing units (CPUs). It allows system software...

Real mode, also called real address mode, is an operating mode of all x86-compatible CPUs. The mode gets its name from the fact that addresses in real...

enter this mode when the computer is running on batteries and the lid is closed. If undesired, the behavior can be altered in the operating system settings...

architecture, long mode is the mode where a 64-bit operating system can access 64-bit instructions and registers. 64-bit programs are run in a sub-mode called 64-bit...

incapable of running directly in protected mode while the processor is running a protected mode operating system. It is a hardware virtualization technique...