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Date:      Wed, 20 Sep 2017 18:30:37 +0000 (UTC)
From:      Conrad Meyer <cem@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r323822 - in head/sys/x86: include x86
Message-ID:  <201709201830.v8KIUbJ0083385@repo.freebsd.org>
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Author: cem
Date: Wed Sep 20 18:30:37 2017
New Revision: 323822
URL: https://svnweb.freebsd.org/changeset/base/323822

Log:
  x86: Decode AMD "Extended Feature Extensions ID EBX" bits
  
  In particular, this determines CPU support for the CLZERO instruction.
  
  (No, I am not making this name up.)
  
  Sponsored by:	Dell EMC Isilon

Modified:
  head/sys/x86/include/specialreg.h
  head/sys/x86/include/x86_var.h
  head/sys/x86/x86/identcpu.c

Modified: head/sys/x86/include/specialreg.h
==============================================================================
--- head/sys/x86/include/specialreg.h	Wed Sep 20 18:04:28 2017	(r323821)
+++ head/sys/x86/include/specialreg.h	Wed Sep 20 18:30:37 2017	(r323822)
@@ -331,6 +331,13 @@
 #define	AMDPM_CPB		0x00000200
 
 /*
+ * AMD extended function 8000_0008h ebx info (amd_extended_feature_extensions)
+ */
+#define	AMDFEID_CLZERO		0x00000001
+#define	AMDFEID_IRPERF		0x00000002
+#define	AMDFEID_XSAVEERPTR	0x00000004
+
+/*
  * AMD extended function 8000_0008h ecx info
  */
 #define	AMDID_CMP_CORES		0x000000ff

Modified: head/sys/x86/include/x86_var.h
==============================================================================
--- head/sys/x86/include/x86_var.h	Wed Sep 20 18:04:28 2017	(r323821)
+++ head/sys/x86/include/x86_var.h	Wed Sep 20 18:30:37 2017	(r323822)
@@ -46,6 +46,7 @@ extern	u_int	amd_feature;
 extern	u_int	amd_feature2;
 extern	u_int	amd_rascap;
 extern	u_int	amd_pminfo;
+extern	u_int	amd_extended_feature_extensions;
 extern	u_int	via_feature_rng;
 extern	u_int	via_feature_xcrypt;
 extern	u_int	cpu_clflush_line_size;

Modified: head/sys/x86/x86/identcpu.c
==============================================================================
--- head/sys/x86/x86/identcpu.c	Wed Sep 20 18:04:28 2017	(r323821)
+++ head/sys/x86/x86/identcpu.c	Wed Sep 20 18:30:37 2017	(r323822)
@@ -93,6 +93,7 @@ u_int	amd_feature;		/* AMD feature flags */
 u_int	amd_feature2;		/* AMD feature flags */
 u_int	amd_rascap;		/* AMD RAS capabilities */
 u_int	amd_pminfo;		/* AMD advanced power management info */
+u_int	amd_extended_feature_extensions;
 u_int	via_feature_rng;	/* VIA RNG features */
 u_int	via_feature_xcrypt;	/* VIA ACE features */
 u_int	cpu_high;		/* Highest arg to CPUID */
@@ -992,6 +993,16 @@ printcpuinfo(void)
 				}
 			}
 
+			if (amd_extended_feature_extensions != 0) {
+				printf("\n  "
+				    "AMD Extended Feature Extensions ID EBX="
+				    "0x%b", amd_extended_feature_extensions,
+				    "\020"
+				    "\001CLZERO"
+				    "\002IRPerf"
+				    "\003XSaveErPtr");
+			}
+
 			if (via_feature_rng != 0 || via_feature_xcrypt != 0)
 				print_via_padlock_info();
 
@@ -1468,6 +1479,7 @@ finishidentcpu(void)
 	if (cpu_exthigh >= 0x80000008) {
 		do_cpuid(0x80000008, regs);
 		cpu_maxphyaddr = regs[0] & 0xff;
+		amd_extended_feature_extensions = regs[1];
 		cpu_procinfo2 = regs[2];
 	} else {
 		cpu_maxphyaddr = (cpu_feature & CPUID_PAE) != 0 ? 36 : 32;

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