Bitmap of pseudo-random sources for entropy collection as follows:

    Bits 0-15 are software-derived sources of entropy.  Not all software
    sources may be implemented in all configurations.

    Bits 16-32 are hardware-provided "pure" sources.  Not all hardware
    sources are available on all platforms or virtual machines.

    Bit 0:	- Cached data loaded at boot
    Bit 1:	- Device attachment
    Bit 2:	- Per-CPU counters
    Bit 3:	- Lock manager
    Bit 4:	- Cluster sources
    Bit 5:	- Reserved for future use
    Bit 6:	- Network packets
    Bit 7:	- Interrupts
    Bit 8:	- Software interrupts
    Bit 9:	- File system access time
    Bit 10:	- Non-paged pool deallocation
    Bit 11-15:	- Reserved for future use
    Bit 16:	- RDRAND instruction
    Bit 17:	- VirtIO Random driver (requires host and guest support)
    Bit 18-31:	- Reserved for future use

    The default value is -1, enabling all available sources.  VSI strongly
    recommends leaving all sources enabled unless there is a specific need
    to disable a particular source.

    RANDOM_SOURCES is a DYNAMIC parameter.