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Some firmware (e.g. UEFI) uses RTC CMOS to fetch the system's memory configuration. Put lowmem / highmem info in the designated area. This is a port of Bhyve vRTC's user-space logic. v1 -> v2: * move KB/MB/GB to macros.h * move nvram offset definitions to rtc.h Tracked-On: #1390 Signed-off-by: Peter Fang <peter.fang@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>