Module Name: src
Committed By: jruoho
Date: Fri Feb 25 05:07:43 UTC 2011
Modified Files:
src/sys/dev/acpi: acpi_cpu_tstate.c
Log Message:
Clarify a comment.
To generate a diff of this commit:
cvs rdiff -u -r1.21 -r1.22 src/sys/dev/acpi/acpi_cpu_tstate.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/dev/acpi/acpi_cpu_tstate.c
diff -u src/sys/dev/acpi/acpi_cpu_tstate.c:1.21 src/sys/dev/acpi/acpi_cpu_tstate.c:1.22
--- src/sys/dev/acpi/acpi_cpu_tstate.c:1.21 Wed Feb 23 06:17:55 2011
+++ src/sys/dev/acpi/acpi_cpu_tstate.c Fri Feb 25 05:07:43 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: acpi_cpu_tstate.c,v 1.21 2011/02/23 06:17:55 jruoho Exp $ */
+/* $NetBSD: acpi_cpu_tstate.c,v 1.22 2011/02/25 05:07:43 jruoho Exp $ */
/*-
* Copyright (c) 2010 Jukka Ruohonen <jruoho...@iki.fi>
@@ -27,7 +27,7 @@
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_cpu_tstate.c,v 1.21 2011/02/23 06:17:55 jruoho Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_cpu_tstate.c,v 1.22 2011/02/25 05:07:43 jruoho Exp $");
#include <sys/param.h>
#include <sys/evcnt.h>
@@ -518,8 +518,14 @@
return AE_AML_ILLEGAL_ADDRESS;
/*
- * A zero DUTY_WIDTH is used announce that
- * T-states are not available via FADT.
+ * A zero DUTY_WIDTH may be used announce
+ * that T-states are not available via FADT
+ * (ACPI 4.0, p. 121). See also (section 9.3):
+ *
+ * Advanced Micro Devices: BIOS and Kernel
+ * Developer's Guide for AMD Athlon 64 and
+ * AMD Opteron Processors. Revision 3.30,
+ * February 2006.
*/
if (width == 0 || width + offset > 4)
return AE_AML_BAD_RESOURCE_VALUE;
