11844 add rdmsr utility
Reviewed by: Dan McDonald <danmcd@joyent.com>

@@ -22,11 +22,11 @@
 /*
  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 /*
- * Copyright (c) 2012, Joyent, Inc.  All rights reserved.
+ * Copyright 2019 Joyent, Inc.
  */
 
 #ifndef _SYS_CPUID_DRV_H
 #define _SYS_CPUID_DRV_H
 

@@ -62,16 +62,22 @@
  * ioctl numbers: not an exported interface
  */
 #define CPUID_IOC               (('c'<<24)|('i'<<16)|('d'<<8))
 
 #define CPUID_GET_HWCAP         (CPUID_IOC|0)
+#define CPUID_RDMSR             (CPUID_IOC|1)
 
 struct cpuid_get_hwcap {
         char *cgh_archname;
         uint_t cgh_hwcap[2];
 };
 
+struct cpuid_rdmsr {
+        uint64_t cr_msr_nr;
+        uint64_t cr_msr_val;
+};
+
 #if defined(_SYSCALL32_IMPL)
 
 #include <sys/types32.h>
 
 struct cpuid_get_hwcap32 {