Ah, the line in the acpi_cpu_mwait function should be read as:
cpu_monitor(state, 0, 0);
Vitaly, could you test the jkim's patch again with the above line modified?
Jung-uk, the MONITOR insn seems to result in GPF if its extensions is
anything but zero.
# I admit it's very confusing that the semantics of extensions to
# MONITOR and MWAIT are different from each other...
On Wed, 13 Jul 2011 00:04:11 +0300
Vitaly Magerya <vmage...@gmail.com> wrote:
> Vitaly Magerya <vmage...@gmail.com> wrote:
> > Jung-uk Kim m...@freebsd.org> wrote:
> >> I have written a very rough patch and it is available from here:
> >>
> >> http://people.freebsd.org/m/acpi_cst.diff
> >>
> >> It compiles but wasn't tested at all, i.e., I have no hardware.
> >> Please be careful.
> >
> > Cool. I'll try it.
>
> Sorry for the delay (I had to install CURRENT first).
>
> When I boot a kernel with that patch, I get this panic:
>
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 0; apic id = 00
> instruction pointer = 0x20:0xc04cd782
> stack pointer = 0x28:0xc3bddc3c
> frame pointer = 0x28:0xc3bddc80
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = resume, IOPL = 0
> current process = 11 (idle: cpu0)
> [ thread pid 11 tid 100003 ]
> Stopped at acpi_cpi_idle+0x1c2: monitor
>
> Here's the backtrace:
>
> Tracing pid 11 tid 100003 td 0xc3d7f8a0
> acpi_cpu_idle(1d,c3bddca4,c0992e99,0,1d,...) at acpi_cpu_idle+0x1c2
> cpu_idle_acpi(0,1d,0,c3d7f8a0,c3bddcec,...) at cpu_idle_acpi+0x2f
> cpu_idle(0,c3bddcc8,c0a27d18,a03,c3d7f8a0,...) at cpu_idle+0x89
> sed_idletd(0,c3bddd28,ff7ff3ff,c3d7d840,0,...) at sched_idletd+0x249
> fork_exit(c0721060,0,c3bddd28) at fork_exit+0x97
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0, eip = 0, esp = 0xc3bddd60, ebp = 0 ---
>
> (Yes, I typed all that manually).
>
> My kernel is GENERIC without WITNESS, INVARIANTS and a whole lot
> of drivers my system doesn't need (I can show the file on request).
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--
-|-__ 山本 拓 / YAMAMOTO, Taku
| __ < <t...@tackymt.homeip.net>
- A chicken is an egg's way of producing more eggs. -
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