svn commit: r209371 - in head/sys: amd64/amd64 amd64/include conf dev/acpica i386/i386 i386/include isa kern pc98/cbus sys x86/isa x86/x86

[Kostik Belousov]

On Sun, Jun 20, 2010 at 09:33:29PM +0000, Alexander Motin wrote:
> Author: mav
> Date: Sun Jun 20 21:33:29 2010
> New Revision: 209371
> URL: http://svn.freebsd.org/changeset/base/209371
> 
> Log:
>   Implement new event timers infrastructure. It provides unified APIs for
>   writing event timer drivers, for choosing best possible drivers by machine
>   independent code and for operating them to supply kernel with hardclock(),
>   statclock() and profclock() events in unified fashion on various hardware.
>   
>   Infrastructure provides support for both per-CPU (independent for every CPU
>   core) and global timers in periodic and one-shot modes. MI management code
>   at this moment uses only periodic mode, but one-shot mode use planned for
>   later, as part of tickless kernel project.
>   
>   For this moment infrastructure used on i386 and amd64 architectures. Other
>   archs are welcome to follow, while their current operation should not be
>   affected.
>   
>   This patch updates existing drivers (i8254, RTC and LAPIC) for the new
>   order, and adds event timers support into the HPET driver. These drivers
>   have different capabilities:
>    LAPIC - per-CPU timer, supports periodic and one-shot operation, may
>   freeze in C3 state, calibrated on first use, so may be not exactly precise.
>    HPET - depending on hardware can work as per-CPU or global, supports
>   periodic and one-shot operation, usually provides several event timers.
>    i8254 - global, limited to periodic mode, because same hardware used also
>   as time counter.
>    RTC - global, supports only periodic mode, set of frequencies in Hz
>   limited by powers of 2.
>   
>   Depending on hardware capabilities, drivers preferred in following orders,
>   either LAPIC, HPETs, i8254, RTC or HPETs, LAPIC, i8254, RTC.
>   User may explicitly specify wanted timers via loader tunables or sysctls:
>   kern.eventtimer.timer1 and kern.eventtimer.timer2.
>   If requested driver is unavailable or unoperational, system will try to
>   replace it. If no more timers available or "NONE" specified for second,
>   system will operate using only one timer, multiplying it's frequency by few
>   times and uing respective dividers to honor hz, stathz and profhz values,
>   set during initial setup.

This broke QEMU for me. I cannot boot FreeBSD guest under QEMU anymore.
QEMU (not FreeBSD kernel) panics with
qemu: level-triggered hpet not supported
message.

Setting kern.eventtimer.timer1 to LAPIC or i8254, and timer2 to NONE
does not help.
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