The Reboot Flags.
This is a collection of flags used to indicate the re-boot
options available. This integer is a bitmap, with each bit
indicating the availability of an option. If the bit is set
to 1, the option is available; otherwise it is not. Multiple
options are allowed.
NOTE: bit 31 is the most significant bit, bit 0 is the least
significant.
Status This is a collection of flags. Each bit has the
following meaning when it is on (1):
Bit 31: Execute Set
Bit 30-6: RESERVED
Bit 5: Boot to ROM Based Setup
Bit 4: RESERVED
Bit 3: Boot to OS
Bit 2: Boot to Utils
Bit 1: Warm Boot
Bit 0: Cold Boot