Re: [Qemu-devel] Help - `flush_icache_range' MacPPC

[Brad Smith]

On 07/02/12 5:12 PM, malc wrote:
> On Tue, 7 Feb 2012, Alexander Graf wrote:
>
> > On 07.02.2012, at 22:12, malc wrote:
> >
> > > On Tue, 7 Feb 2012, Alexander Graf wrote:
> > >
> > > > On 07.02.2012, at 13:52, Maurizio Caloro wrote:
> > > >
> > > > > Hello Together
> > > > > Here i drive with me MiniMac G4 1.4Ghz and i try to run Qemu 1.0. i wan't run 
> > > > > one Virt. MS Server2008 it's this realistic?.
> > > > >
> > > > > Unfortunitly from the first (other) Mailinglist i don't become any Answer.
> > > > >
> > > > > on a possible error recovery support, I would grateful to you.
> > > > > Thanks and best regards
> > > > > Mauri
> > > > >
> > > > > > NetBSD powermac.G4 5.1 NetBSD 5.1 (GENERIC) #0: Sat Nov  6 17:09:11 UTC>2010  
> > > > > > address@hidden:/home/builds/ab/netbsd-5-1->RELEASE/macppc/201011061943Z-obj/home/builds/ab/netbsd-5-1->RELEASE/src/sys/arch/macppc/compile/GENERIC
> > > > > >  macppc
> > > > > >
> > > > > > # gmake
> > > > > > CC    i386-softmmu/memory.o
> > > > > > LINK  i386-softmmu/qemu-system-i386
> > > > > > ld: warning: libintl.so.0, needed by /usr/pkg/lib/libgthread-2.0.so, may 
> > > > > > conflict with libintl.so.8
> > > > > > tcg/tcg.o: In function `tcg_prologue_init':
> > > > > > /usr/source/qemu-1.0/tcg/tcg.c:268: undefined reference to `flush_icache_range'
> > > > > > tcg/tcg.o: In function `ppc_tb_set_jmp_target':
> > > > > > /usr/source/qemu-1.0/tcg/ppc/tcg-target.c:1291: undefined reference to 
> > > > > > `flush_icache_range'
> > > > > > tcg/tcg.o: In function `tcg_gen_code':
> > > > > > /usr/source/qemu-1.0/tcg/tcg.c:2191: undefined reference to `flush_icache_range'
> > > >
> > > > I'd say your gcc is too old / buggy.
> > >
> > > You probably missed the NetBSD part (anyway originally i did)
> >
> > Gcc on NetBSD doesn't implement the cache flush helpers? They're just a
> > bunch of instructions, so I don't see how that'd be target os specific.
>
> Take a look at cache-utils.c, it conditionally (depending on the host OS
> type) tries to gigure out the cache line sizes, there's code to do that
> on Linux, OSX, AIX and FreeBSD. I have no idea if FreeBSD method works
> for Net/Open/Dragonfly.. so..

The FreeBSD method will not work with NetBSD. For NetBSD you have to use
the machdep.cacheinfo sysctl MIB. For OpenBSD this is the only local patch
we have since there is no sysctl (yet) to retrieve the cache line size.
DragonFly has no PowerPC support.

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