svn commit: r336257 - head/sys/x86/include

[Mark Johnston]

Author: markj
Date: Fri Jul 13 19:42:59 2018
New Revision: 336257
URL: https://svnweb.freebsd.org/changeset/base/336257

Log:
  Define the MSR used to fetch the current microcode patch level on AMD.
  
  It is defined in the AMD family 17h register reference.
  
  MFC after:	3 days
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/x86/include/specialreg.h

Modified: head/sys/x86/include/specialreg.h
==============================================================================
--- head/sys/x86/include/specialreg.h	Fri Jul 13 18:58:37 2018	(r336256)
+++ head/sys/x86/include/specialreg.h	Fri Jul 13 19:42:59 2018	(r336257)
@@ -973,6 +973,7 @@
 #define	AMD_WT_ALLOC_FRE	0x10000	/* fixed (A0000-FFFFF) range enable */
 
 /* AMD64 MSR's */
+#define	MSR_PATCH_LEVEL	0x0000008b	/* microcode revision number */
 #define	MSR_EFER	0xc0000080	/* extended features */
 #define	MSR_STAR	0xc0000081	/* legacy mode SYSCALL target/cs/ss */
 #define	MSR_LSTAR	0xc0000082	/* long mode SYSCALL target rip */