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# Date Author Comment
691a0c9c 07/23/2011 07:26 pm Jan Kiszka

qemu-timer: Introduce clock reset notifier

QEMU_CLOCK_HOST is based on the system time which may jump backward in
case the admin or NTP adjusts it. RTC emulations and other device models
can suffer in this case as timers will stall for the period the clock...
2821d0f3 04/27/2011 02:30 pm Stefan Weil

qemu-timer: Remove unneeded include statement (w32)

mmsystem.h is not needed in qemu-timer.h, so remove it.

Signed-off-by: Stefan Weil <>
852f771e 04/22/2011 10:41 pm Juan Quintela

vmstate: port pmtimer

It was a half conversion. Finish it.
enabled can only get values of 0, 1 or 2, was declared as an int but
sent as an unint8_t, change its type.

Signed-off-by: Juan Quintela <>
70c3b557 04/15/2011 11:14 pm Blue Swirl

Move clock related functions to qemu-timer.h

Move declarations for clock related functions from sysemu.h to qemu-timer.h.

Signed-off-by: Blue Swirl <>
ab33fcda 04/15/2011 10:27 am Paolo Bonzini

enable vm_clock to "warp" in the iothread+icount case

The previous patch however is not enough, because if the virtual CPU
goes to sleep waiting for a future timer interrupt to wake it up, qemu
deadlocks. The timer interrupt never comes because time is driven by...
cb842c90 04/15/2011 10:27 am Paolo Bonzini

qemu_next_deadline should not consider host-time timers

It is purely for icount-based virtual timers. And now that we got the
code right, rename the function to clarify the intended scope.

Signed-off-by: Paolo Bonzini <>
Tested-by: Edgar E. Iglesias <>...
0ce1b948 03/21/2011 10:23 am Paolo Bonzini

add more helper functions with explicit milli/nanosecond resolution

The code doesn't make much sense right now, but it will as
soon as timers will be able to scale their resolution arbitrarily.

Signed-off-by: Paolo Bonzini <>
4a998740 03/21/2011 10:23 am Paolo Bonzini

add a generic scaling mechanism for timers

This enables rt_clock timers to use nanosecond resolution, just by
using the _ns functions; there is really no reason to forbid that.

Migrated timers are all using vm_clock (of course; but I checked that
anyway) so the timers in the savevm files are already in nanosecond...
6d5ad9bf 03/21/2011 10:23 am Paolo Bonzini

remove qemu_get_clock

These patches are already not doing a great service to out-of-tree
modifications to QEMU. However, at least we can warn them by getting
rid of the old confusing functions, or otherwise causing compilation
errors. This patch removes qemu_get_clock; the previous one changed...
338b922e 10/30/2010 12:41 am malc

Mov muldiv64 to qemu-common.h (Thus unbreaking gus)

Signed-off-by: malc <>
c57c846a 10/23/2010 06:24 pm Blue Swirl

qemu-timer: move commonly used timer code to qemu-timer-common

Move timer init functions to a new file, qemu-timer-common.c. Make other
critical timer functions inlined to preserve performance in
qemu-timer.c, also move muldiv64() (used by the inline functions)...
14a6063a 04/27/2010 06:50 am Richard Henderson

Implement cpu_get_real_ticks for Alpha.

Signed-off-by: Richard Henderson <>
Signed-off-by: Aurelien Jarno <>
2d8ebcf9 04/17/2010 07:25 pm Richard Henderson

Fix --enable-profiler compilation.

There's a header file inclusion ordering problem between cpu-all.h
and qemu-timer.h, such that cpu_get_real_ticks is not defined when
we attempt to use it in profile_getclock.

Signed-off-by: Richard Henderson <>...
4a9590f3 04/03/2010 01:26 pm Alexander Graf

Make cpu_get_real_ticks use mfspr

PowerPC CPUs have had two ways to read the time base for quite some time now.
They provide it using the mfspr instruction or - if a special bit is set in
that opcode - using mftb. For timekeeping we're currently using mftb....
29e922b6 03/29/2010 10:24 pm Blue Swirl

Compile qemu-timer only once

Arrange various declarations so that also non-CPU code can access
them, adjust users.

Move CPU specific code to cpus.c.

Signed-off-by: Blue Swirl <>
db1a4972 03/17/2010 06:16 pm Paolo Bonzini

split out qemu-timer.c

Signed-off-by: Paolo Bonzini <>
Signed-off-by: Anthony Liguori <>
41c872b6 02/10/2010 12:56 am Paolo Bonzini

add qemu_get_clock_ns

Some places use get_clock directly because they want to access the
rt_clock with nanosecond precision. Add a function to do exactly that
instead of using internal interfaces.

Signed-off-by: Paolo Bonzini <>
Signed-off-by: Anthony Liguori <>
21d5d12b 10/05/2009 05:32 pm Jan Kiszka

Introduce QEMU_CLOCK_HOST

Despite its name QEMU_CLOCK_REALTIME is (normally) not using
CLOCK_REALTIME / the host system time as base. In order to allow also
non-trivial RTC emulations (MC146818) to follow the host time instead of
the virtual guest time, introduce the new clock type QEMU_CLOCK_HOST. It...
274dfed8 09/11/2009 07:10 pm Anthony Liguori

Make get_ticks_per_sec() a static inline

ticks_per_sec is a constant. There's no need to store it as a variable as it
never changes since our time is based on units.

Convert get_ticks_per_sec() to a static inline and move the constant into
qemu-timer.h. Remove all references to QEMU_TIMER_BASE so that we consistently...
6ee093c9 09/11/2009 06:19 pm Juan Quintela

Unexport ticks_per_sec variable. Create get_ticks_per_sec() function

Signed-off-by: Juan Quintela <>
Signed-off-by: Anthony Liguori <>
2430ffe4 08/10/2009 09:05 pm Stefano Stabellini

variable timer intervals

This patch introduces dynamic timer intervals: we slow down the refresh
rate when there in no much activity but we get back to a fast refresh
rate when the activity resume.

Please note that qemu_timer_expired is not an inline function any more...
87ecb68b 11/17/2007 07:14 pm pbrook

Break up vl.h.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3674 c046a42c-6fe2-441c-8c8c-71466251a162