Module Name: src
Committed By: martin
Date: Wed Oct 2 18:24:35 UTC 2024
Modified Files:
src/sys/arch/x86/x86 [netbsd-10]: tsc.c
Log Message:
Pull up following revision(s) (requested by rin in ticket #915):
sys/arch/x86/x86/tsc.c: revision 1.59
sys/arch/x86/x86/tsc.c: revision 1.60
make TSC get a quality of -100 on AMD Family 15h and 16h
this should "fix" PR#56322 and is known as AMD errata
"778: Processor Core Time Stamp Counters May Experience Drift"
remove unintended printf() in previous. (thx dh)
To generate a diff of this commit:
cvs rdiff -u -r1.57 -r1.57.4.1 src/sys/arch/x86/x86/tsc.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/x86/x86/tsc.c
diff -u src/sys/arch/x86/x86/tsc.c:1.57 src/sys/arch/x86/x86/tsc.c:1.57.4.1
--- src/sys/arch/x86/x86/tsc.c:1.57 Fri Oct 15 18:12:48 2021
+++ src/sys/arch/x86/x86/tsc.c Wed Oct 2 18:24:35 2024
@@ -1,4 +1,4 @@
-/* $NetBSD: tsc.c,v 1.57 2021/10/15 18:12:48 jmcneill Exp $ */
+/* $NetBSD: tsc.c,v 1.57.4.1 2024/10/02 18:24:35 martin Exp $ */
/*-
* Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tsc.c,v 1.57 2021/10/15 18:12:48 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tsc.c,v 1.57.4.1 2024/10/02 18:24:35 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -132,6 +132,18 @@ tsc_is_invariant(void)
* Manual Volume 3: General-Purpose and System Instructions.
* The check is done below.
*/
+
+ /*
+ * AMD Errata 778: Processor Core Time Stamp Counters May
+ * Experience Drift
+ *
+ * This affects all family 15h and family 16h processors.
+ */
+ switch (CPUID_TO_FAMILY(ci->ci_signature)) {
+ case 0x15:
+ case 0x16:
+ return false;
+ }
}
/*
