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authorDavid Vrabel <david.vrabel@citrix.com>2013-05-13 18:56:06 +0100
committerJohn Stultz <john.stultz@linaro.org>2013-05-28 14:00:59 -0700
commit3565184ed0c1ea46bea5b792da5f72a83c43e49b (patch)
tree4846a589a6aa295634ef585e5637872f15c19993 /arch/x86/include/asm/mc146818rtc.h
parent0a0a7e66fa269de78975ea8d4e825a66d92b8d70 (diff)
x86: Increase precision of x86_platform.get/set_wallclock()
All the virtualized platforms (KVM, lguest and Xen) have persistent wallclocks that have more than one second of precision. read_persistent_wallclock() and update_persistent_wallclock() allow for nanosecond precision but their implementation on x86 with x86_platform.get/set_wallclock() only allows for one second precision. This means guests may see a wallclock time that is off by up to 1 second. Make set_wallclock() and get_wallclock() take a struct timespec parameter (which allows for nanosecond precision) so KVM and Xen guests may start with a more accurate wallclock time and a Xen dom0 can maintain a more accurate wallclock for guests. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'arch/x86/include/asm/mc146818rtc.h')
-rw-r--r--arch/x86/include/asm/mc146818rtc.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/mc146818rtc.h b/arch/x86/include/asm/mc146818rtc.h
index d354fb781c57..a55c7efcc4ed 100644
--- a/arch/x86/include/asm/mc146818rtc.h
+++ b/arch/x86/include/asm/mc146818rtc.h
@@ -95,8 +95,8 @@ static inline unsigned char current_lock_cmos_reg(void)
unsigned char rtc_cmos_read(unsigned char addr);
void rtc_cmos_write(unsigned char val, unsigned char addr);
-extern int mach_set_rtc_mmss(unsigned long nowtime);
-extern unsigned long mach_get_cmos_time(void);
+extern int mach_set_rtc_mmss(const struct timespec *now);
+extern void mach_get_cmos_time(struct timespec *now);
#define RTC_IRQ 8