[src/trunk]: src/sys/arch/x86 bring in this change from openbsd:

[chs <chs%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1d52876280a3
branches:  trunk
changeset: 778614:1d52876280a3
user:      chs <chs%NetBSD.org@localhost>
date:      Fri Apr 06 17:23:39 2012 +0000

description:
bring in this change from openbsd:
Implement the AMD suggested workaround for family 10h & 12h errata 721
"Processor May Incorrectly Update Stack Pointer" by setting a bit
marked 'reserved' in an MSR that is only "documented" to exist on 12h.

diffstat:

 sys/arch/x86/include/specialreg.h |   5 ++++-
 sys/arch/x86/x86/errata.c         |  23 ++++++++++++++++++++---
 2 files changed, 24 insertions(+), 4 deletions(-)

diffs (84 lines):

diff -r ed4a9c7354e2 -r 1d52876280a3 sys/arch/x86/include/specialreg.h
--- a/sys/arch/x86/include/specialreg.h Fri Apr 06 17:16:30 2012 +0000
+++ b/sys/arch/x86/include/specialreg.h Fri Apr 06 17:23:39 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: specialreg.h,v 1.56 2012/03/02 16:41:00 bouyer Exp $   */
+/*     $NetBSD: specialreg.h,v 1.57 2012/04/06 17:23:39 chs Exp $      */
 
 /*-
  * Copyright (c) 1991 The Regents of the University of California.
@@ -516,6 +516,9 @@
 #define                BU_CFG_WBPFSMCCHKDIS    0x0000200000000000ULL
 #define                BU_CFG_WBENHWSBDIS      0x0001000000000000ULL
 
+#define MSR_DE_CFG     0xc0011029
+#define                DE_CFG_ERRATA_721       0x00000001
+
 /* AMD Family10h MSRs */
 #define        MSR_OSVW_ID_LENGTH              0xc0010140
 #define        MSR_OSVW_STATUS                 0xc0010141
diff -r ed4a9c7354e2 -r 1d52876280a3 sys/arch/x86/x86/errata.c
--- a/sys/arch/x86/x86/errata.c Fri Apr 06 17:16:30 2012 +0000
+++ b/sys/arch/x86/x86/errata.c Fri Apr 06 17:23:39 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: errata.c,v 1.19 2010/07/23 22:31:35 cegger Exp $       */
+/*     $NetBSD: errata.c,v 1.20 2012/04/06 17:23:39 chs Exp $  */
 
 /*-
  * Copyright (c) 2007 The NetBSD Foundation, Inc.
@@ -45,7 +45,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: errata.c,v 1.19 2010/07/23 22:31:35 cegger Exp $");
+__KERNEL_RCSID(0, "$NetBSD: errata.c,v 1.20 2012/04/06 17:23:39 chs Exp $");
 
 #include <sys/types.h>
 #include <sys/systm.h>
@@ -69,7 +69,8 @@
 typedef enum cpurev {
        BH_E4, CH_CG, CH_D0, DH_CG, DH_D0, DH_E3, DH_E6, JH_E1,
        JH_E6, SH_B0, SH_B3, SH_C0, SH_CG, SH_D0, SH_E4, SH_E5,
-       DR_BA, DR_B2, DR_B3,
+       DR_BA, DR_B2, DR_B3, RB_C2, RB_C3, BL_C2, BL_C3, DA_C2,
+       DA_C3, HY_D0, HY_D1, HY_D1_G34R1,  PH_E0, LN_B0,
        OINK
 } cpurev_t;
 
@@ -85,6 +86,10 @@
        SH_D0, 0x0010f40, SH_D0, 0x0010f50, SH_D0, 0x0010f70,
        SH_E4, 0x0020f51, SH_E4, 0x0020f71, SH_E5, 0x0020f42,
        DR_BA, 0x0100f2a, DR_B2, 0x0100f22, DR_B3, 0x0100f23,
+       RB_C2, 0x0100f42, RB_C3, 0x0100f43, BL_C2, 0x0100f52,
+       BL_C3, 0x0100f53, DA_C2, 0x0100f62, DA_C3, 0x0100f63,
+       HY_D0, 0x0100f80, HY_D1, 0x0100f81, HY_D1_G34R1, 0x0100f91,
+       PH_E0, 0x0100fa0, LN_B0, 0x0300f10,
        OINK
 };
 
@@ -132,6 +137,11 @@
        DR_BA, DR_B2, DR_B3, OINK
 };
 
+static const uint8_t x86_errata_set11[] = {
+       DR_BA, DR_B2, DR_B3, RB_C2, RB_C3, BL_C2, BL_C3, DA_C2,
+       DA_C3, HY_D0, HY_D1, HY_D1_G34R1,  PH_E0, LN_B0, OINK
+};
+
 static bool x86_errata_setmsr(struct cpu_info *, errata_t *);
 static bool x86_errata_testmsr(struct cpu_info *, errata_t *);
 
@@ -268,6 +278,13 @@
                309, FALSE, MSR_BU_CFG, x86_errata_set9,
                x86_errata_testmsr, BU_CFG_ERRATA_309
        },
+       /*
+        * 721: Processor May Incorrectly Update Stack Pointer
+        */
+       {
+               721, FALSE, MSR_DE_CFG, x86_errata_set11,
+               x86_errata_setmsr, DE_CFG_ERRATA_721
+       },
 };
 
 static bool