Update randomx_boost.sh

- Support builtin MSR, see #2283
- Added detection of AMD EPYC CPUs

scripts/randomx_boost.sh

@@ -1,28 +1,34 @@
 #!/bin/bash
 
-modprobe msr allow_writes=on
+MSR_FILE=/sys/module/msr/parameters/allow_writes
 
-if cat /proc/cpuinfo | grep "AMD Ryzen" > /dev/null;
+if test -e "$MSR_FILE"; then
+	echo on > $MSR_FILE
+else
+	modprobe msr allow_writes=on
+fi
+
+if cat /proc/cpuinfo | grep -E 'AMD Ryzen|AMD EPYC' > /dev/null;
 	then
 	if cat /proc/cpuinfo | grep "cpu family[[:space:]]:[[:space:]]25" > /dev/null;
 		then
-			echo "Detected Ryzen (Zen3)"
+			echo "Detected Zen3 CPU"
 			wrmsr -a 0xc0011020 0x4480000000000
 			wrmsr -a 0xc0011021 0x1c000200000040
 			wrmsr -a 0xc0011022 0xc000000401500000
 			wrmsr -a 0xc001102b 0x2000cc14
-			echo "MSR register values for Ryzen (Zen3) applied"
+			echo "MSR register values for Zen3 applied"
 		else
-			echo "Detected Ryzen (Zen1/Zen2)"
+			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 Ryzen (Zen1/Zen2) applied"
+			echo "MSR register values for Zen1/Zen2 applied"
 		fi
 elif cat /proc/cpuinfo | grep "Intel" > /dev/null;
 	then
-		echo "Detected Intel"
+		echo "Detected Intel CPU"
 		wrmsr -a 0x1a4 0xf
 		echo "MSR register values for Intel applied"
 else