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#!/bin/sh -e
MSR_FILE=/sys/module/msr/parameters/allow_writes
if test -e "$MSR_FILE"; then
echo on > $MSR_FILE
else
modprobe msr allow_writes=on
fi
if grep -E 'AMD Ryzen|AMD EPYC|AuthenticAMD' /proc/cpuinfo > /dev/null;
then
if grep "cpu family[[:space:]]\{1,\}:[[:space:]]25" /proc/cpuinfo > /dev/null;
then
if grep "model[[:space:]]\{1,\}:[[:space:]]97" /proc/cpuinfo > /dev/null;
then
echo "Detected Zen4 CPU"
wrmsr -a 0xc0011020 0x4400000000000
wrmsr -a 0xc0011021 0x4000000000040
wrmsr -a 0xc0011022 0x8680000401570000
wrmsr -a 0xc001102b 0x2040cc10
echo "MSR register values for Zen4 applied"
else
echo "Detected Zen3 CPU"
wrmsr -a 0xc0011020 0x4480000000000
wrmsr -a 0xc0011021 0x1c000200000040
wrmsr -a 0xc0011022 0xc000000401570000
wrmsr -a 0xc001102b 0x2000cc10
echo "MSR register values for Zen3 applied"
fi
elif grep "cpu family[[:space:]]\{1,\}:[[:space:]]26" /proc/cpuinfo > /dev/null;
then
echo "Detected Zen5 CPU"
wrmsr -a 0xc0011020 0x4400000000000
wrmsr -a 0xc0011021 0x4000000000040
wrmsr -a 0xc0011022 0x8680000401570000
wrmsr -a 0xc001102b 0x2040cc10
echo "MSR register values for Zen5 applied"
else
echo "Detected Zen1/Zen2 CPU"
wrmsr -a 0xc0011020 0
wrmsr -a 0xc0011021 0x40
wrmsr -a 0xc0011022 0x1510000
wrmsr -a 0xc001102b 0x2000cc16
echo "MSR register values for Zen1/Zen2 applied"
fi
elif grep "Intel" /proc/cpuinfo > /dev/null;
then
echo "Detected Intel CPU"
wrmsr -a 0x1a4 0xf
echo "MSR register values for Intel applied"
else
echo "No supported CPU detected"
fi
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