#! /bin/sh
set -e

. "@builddir@/grub-core/modinfo.sh"

# FIXME: OpenBIOS on sparc64 doesn't implement RTC
if [ "${grub_modinfo_target_cpu}-${grub_modinfo_platform}" = sparc64-ieee1275 ]; then
    exit 0
fi

# Compare RTC with interval timer.
# Not 100% proper but should check that timer is running ok
dt=`echo 'date; sleep 10; date' | @builddir@/grub-shell`
dt1="$(date -u -d "$(echo "$dt" | head -n 1 | sed 's, [A-Z][a-z]*$,,')" +%s)"
dt2="$(date -u -d "$(echo "$dt" | tail -n 1 | sed 's, [A-Z][a-z]*$,,')" +%s)"

# Ignore QEMU bug
if [ "${grub_modinfo_target_cpu}" = arm ] && [ $((dt2 - dt1)) -ge 15 ] && [ $((dt2 - dt1)) -le 17 ]; then
  exit 0;
fi

if [ $((dt2 - dt1)) -gt 11 ] || [ $((dt2 - dt1)) -lt 9 ]; then
  echo "Interval not in range $dt2-$dt1 != 10"
  exit 1
fi