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[rng] Add RTC-based entropy source

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The RTC-based entropy source uses the nanosecond-scale CPU TSC to
measure the time between two 1kHz interrupts generated by the CMOS
RTC.  In a physical machine these clocks are driven from independent
crystals, resulting in some observable clock drift.  In a virtual
machine, the CMOS RTC is typically emulated using host-OS
constructions such as SIGALRM.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-02-19 22:24:42 +00:00
parent 5d2e65c60f
commit 05719804b9
4 changed files with 298 additions and 1 deletions
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2
src/config/defaults/pcbios.h
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@@ -18,7 +18,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define UMALLOC_MEMTOP
#define SMBIOS_PCBIOS
#define SANBOOT_PCBIOS
#define ENTROPY_NULL
#define ENTROPY_RTC
#define IMAGE_ELF /* ELF image support */
#define IMAGE_MULTIBOOT /* MultiBoot image support */