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xen-devel
RE: [Xen-devel] x86/amd64 vs IA64
Thankyou very much for the information provided below. I'll make my way
through it over the next few days.
James
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Isaku Yamahata
> Sent: Tuesday, 2 June 2009 17:31
> To: James Harper
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] x86/amd64 vs IA64
>
> On Tue, Jun 02, 2009 at 12:26:39PM +1000, James Harper wrote:
> > How different is IA64 to x86/amd64 in terms of hypercalls and
> > platform_pci setup under HVM?
> >
> > I'm having a look at what is involved in porting GPLPV drivers for
> > Windows to IA64.
> >
> > I can't even seem to find where the HYPERCALL_ functions/macros are
> > defined!
>
> Hi. I'm glad to hear that.
> Linux unmodified drivers are supported on ia64, so it's quite
> possible to port GPLPV to IA64 windows, I suppose.
> If you need any help, don't hesitate to ask.
>
> Probably the file you want to see would be
> linux-2.6.18-xen.hg/include/asm-ia64/hypercall.h
> which defines HYPERVISOR_xxx() functions.
> Eventually __hypercall() in
linux-2.6.18-xen.hg/arch/ia64/xen/hypercall.S
> issues hypercall. "break 0x1000" is the instruction.
> 0x1000 is arbitrarily selected constant for hypercall ABI between
> guest kernel and xen VMM.
>
> The most difference is the way to pass arguments.
> On x86, arguments are passed by guest virtual address.
> On the other hand they are passed by guest physical address.
> So when issuing hypercall with arguments, arguments in virtual address
> must be converted into guest physical address. Such stubs are called
> xencomm.
> You can see some of HYPERVISOR_xxx are replaced with
xencomm_hypercall_xxx
> which does such conversions.
>
> Maybe at first xencomm routines should be ported for hypercall.
> linux-2.6.18-xen.hg/drivers/xen/core/xencomm.c and
> linux-2.6.18-xen.hg/arch/ia64/xen/xencomm.c
> I suppose the conversion function from virtual address to guest
> physical address would needs rewrite for ia64 windows.
>
>
> The followings are related files which you might want to see.
>
> ifeq ($(ARCH),ia64)
> xen-platform-pci-objs += xencomm.o xencomm_arch.o xcom_hcall.o
xcom_asm.o
> endif
> in xen-unstable.hg/unmodified_drivers/linux-2.6/platform-pci/Kbuild
>
> The files related to hypercall are
> linux-2.6.18-xen.hg/
> arch/ia64/xen/
> xcom_hcall.c
> xcom_privcmd.c
> xcom_asm.S
> xencomm.c
> drivers/xen/core/
> xencomm.c
>
> thanks,
> --
> yamahata
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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