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Date:      Mon, 12 Jan 2015 07:36:25 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r277047 - in head/sys: amd64/amd64 amd64/include i386/i386 i386/include x86/x86
Message-ID:  <201501120736.t0C7aPxW043673@svn.freebsd.org>
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Author: kib
Date: Mon Jan 12 07:36:25 2015
New Revision: 277047
URL: https://svnweb.freebsd.org/changeset/base/277047

Log:
  For x86, read MAXPHYADDR, defined in SDM vol 3 4.1.4 Enumeration of Paging
  Features by CPUID as CPUID.80000008H:EAX[7:0], into variable cpu_maxphyaddr.
  
  Reviewed by:	alc
  Tested by:	pho
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/amd64/amd64/initcpu.c
  head/sys/amd64/include/md_var.h
  head/sys/i386/i386/initcpu.c
  head/sys/i386/include/md_var.h
  head/sys/x86/x86/identcpu.c

Modified: head/sys/amd64/amd64/initcpu.c
==============================================================================
--- head/sys/amd64/amd64/initcpu.c	Mon Jan 12 07:29:35 2015	(r277046)
+++ head/sys/amd64/amd64/initcpu.c	Mon Jan 12 07:36:25 2015	(r277047)
@@ -78,6 +78,7 @@ u_int	cpu_max_ext_state_size;
 u_int	cpu_mon_mwait_flags;	/* MONITOR/MWAIT flags (CPUID.05H.ECX) */
 u_int	cpu_mon_min_size;	/* MONITOR minimum range size, bytes */
 u_int	cpu_mon_max_size;	/* MONITOR minimum range size, bytes */
+u_int	cpu_maxphyaddr;		/* Max phys addr width in bits */
 
 SYSCTL_UINT(_hw, OID_AUTO, via_feature_rng, CTLFLAG_RD,
 	&via_feature_rng, 0, "VIA RNG feature available in CPU");

Modified: head/sys/amd64/include/md_var.h
==============================================================================
--- head/sys/amd64/include/md_var.h	Mon Jan 12 07:29:35 2015	(r277046)
+++ head/sys/amd64/include/md_var.h	Mon Jan 12 07:36:25 2015	(r277047)
@@ -61,6 +61,7 @@ extern	u_int	cpu_vendor_id;
 extern	u_int	cpu_mon_mwait_flags;
 extern	u_int	cpu_mon_min_size;
 extern	u_int	cpu_mon_max_size;
+extern	u_int	cpu_maxphyaddr;
 extern	char	ctx_switch_xsave[];
 extern	u_int	hv_high;
 extern	char	hv_vendor[];

Modified: head/sys/i386/i386/initcpu.c
==============================================================================
--- head/sys/i386/i386/initcpu.c	Mon Jan 12 07:29:35 2015	(r277046)
+++ head/sys/i386/i386/initcpu.c	Mon Jan 12 07:36:25 2015	(r277047)
@@ -107,6 +107,7 @@ u_int	cpu_mon_mwait_flags;	/* MONITOR/MW
 u_int	cpu_mon_min_size;	/* MONITOR minimum range size, bytes */
 u_int	cpu_mon_max_size;	/* MONITOR minimum range size, bytes */
 u_int	cyrix_did;		/* Device ID of Cyrix CPU */
+u_int	cpu_maxphyaddr;		/* Max phys addr width in bits */
 
 SYSCTL_UINT(_hw, OID_AUTO, via_feature_rng, CTLFLAG_RD,
 	&via_feature_rng, 0, "VIA RNG feature available in CPU");

Modified: head/sys/i386/include/md_var.h
==============================================================================
--- head/sys/i386/include/md_var.h	Mon Jan 12 07:29:35 2015	(r277046)
+++ head/sys/i386/include/md_var.h	Mon Jan 12 07:36:25 2015	(r277047)
@@ -61,6 +61,7 @@ extern	u_int	cpu_vendor_id;
 extern	u_int	cpu_mon_mwait_flags;
 extern	u_int	cpu_mon_min_size;
 extern	u_int	cpu_mon_max_size;
+extern	u_int	cpu_maxphyaddr;
 extern	u_int	cyrix_did;
 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
 extern	int	has_f00f_bug;

Modified: head/sys/x86/x86/identcpu.c
==============================================================================
--- head/sys/x86/x86/identcpu.c	Mon Jan 12 07:29:35 2015	(r277046)
+++ head/sys/x86/x86/identcpu.c	Mon Jan 12 07:36:25 2015	(r277047)
@@ -1393,7 +1393,10 @@ identify_cpu(void)
 	}
 	if (cpu_exthigh >= 0x80000008) {
 		do_cpuid(0x80000008, regs);
+		cpu_maxphyaddr = regs[0] & 0xff;
 		cpu_procinfo2 = regs[2];
+	} else {
+		cpu_maxphyaddr = (cpu_feature & CPUID_PAE) != 0 ? 36 : 32;
 	}
 
 #ifdef __i386__

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