m1x/x86_64: Add CPUID macro helper

Signed-off-by: Ian Moffett <ian@mirocom.org>

src/m1x/include/arch/x86_64/cpuid.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2026, Mirocom Laboratories
+ * Provided under the BSD-3 clause
+ */
+
+#ifndef _MACHINE_CPUID_H_
+#define _MACHINE_CPUID_H_ 1
+
+#include <sys/types.h>
+#include <sys/cdefs.h>
+
+#define CPUID(level, a, b, c, d)                        \
+    __asmv("cpuid\n\t"                                    \
+            : "=a" (a), "=b" (b), "=c" (c), "=d" (d)    \
+            : "0" (level))
+
+#endif  /* !_MACHINE_CPUID_H_ */